Relevant bibliographies by topics / Magnetic traps

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Magnetic traps'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 August 2024

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Journal articles on the topic "Magnetic traps"

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LYUKSYUTOV, I. F. "NANOSCALE MAGNETIC TRAPS." Modern Physics Letters B 16, no. 15n16 (July 10, 2002): 569–76. http://dx.doi.org/10.1142/s0217984902004081.

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We show that nanofabricated magnetic textures allow the trapping and manipulation of nanosize diamagnetic systems, such as carbon nanotubes, proteins and membranes as well as cold atoms. The latter can have temperatures as high as 1 K. Magnetic textures which can be used as traps, include films, dots and nanowires, both single and in arrays. Manipulation with trapped nanoparticles/atoms is possible by using external magnetic fields. We also briefly discuss prospects for magnetic traps at the micron scale.
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Skovoroda, Alexander A. "Principles of Magnetic Traps Symmetrization." Fusion Technology 35, no. 1T (January 1999): 238–42. http://dx.doi.org/10.13182/fst99-a11963859.

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Metcalf, H. "Magnetic traps for neutral atoms." Annales de Physique 10, no. 6 (1985): 733–36. http://dx.doi.org/10.1051/anphys:01985001006073300.

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Pickel, Jason G., and Daniel G. Cole. "Manipulation of Magnetic Particles Using Adaptive Magnetic Traps." IEEE Transactions on Control Systems Technology 21, no. 1 (January 2013): 212–19. http://dx.doi.org/10.1109/tcst.2011.2174364.

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Meacher, David. "Magnetic traps hit a new low." Physics World 8, no. 7 (July 1995): 21–22. http://dx.doi.org/10.1088/2058-7058/8/7/22.

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Koelman, J. M. V. A., H. T. C. Stoof, B. J. Verhaar, and J. T. M. Walraven. "Spin-polarized deuterium in magnetic traps." Physical Review Letters 59, no. 6 (August 10, 1987): 676–79. http://dx.doi.org/10.1103/physrevlett.59.676.

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Brushlinskii, K. V., A. S. Gol’dich, and A. S. Desyatova. "Plasmostatic models of magnetic galateya-traps." Mathematical Models and Computer Simulations 5, no. 2 (March 24, 2013): 156–66. http://dx.doi.org/10.1134/s207004821302004x.

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Reichel, J., W. Hänsel, and T. W. Hänsch. "Atomic Micromanipulation with Magnetic Surface Traps." Physical Review Letters 83, no. 17 (October 25, 1999): 3398–401. http://dx.doi.org/10.1103/physrevlett.83.3398.

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Allwood, D. A., T. Schrefl, G. Hrkac, I. G. Hughes, and C. S. Adams. "Mobile atom traps using magnetic nanowires." Applied Physics Letters 89, no. 1 (July 3, 2006): 014102. http://dx.doi.org/10.1063/1.2219397.

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Lionnet, T., J. F. Allemand, A. Revyakin, T. R. Strick, O. A. Saleh, D. Bensimon, and V. Croquette. "Single-Molecule Studies Using Magnetic Traps." Cold Spring Harbor Protocols 2012, no. 1 (December 22, 2011): pdb.top067488. http://dx.doi.org/10.1101/pdb.top067488.

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Dissertations / Theses on the topic "Magnetic traps"

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Grady, Keith J. "Solar flare particle acceleration in collapsing magnetic traps." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/2839.

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The topic of this thesis is a detailed investigation of different aspects of the particle acceleration mechanisms operating in Collapsing Magnetic Traps (CMTs), which have been suggested as one possible mechanism for particle acceleration during solar flares. The acceleration processes in CMTs are investigated using guiding centre test particle calculations. Results including terms of different orders in the guiding centre approximation are compared to help identify which of the terms are important for the acceleration of particles. For a basic 2D CMT model the effects of different initial conditions (position, kinetic energy and pitch angle) of particles are investigated in detail. The main result is that the particles that gain most energy are those with initial pitch angles close to 90° and start in weak field regions in the centre of the CMT. The dominant acceleration mechanism for these particles is betatron acceleration, but other particles also show signatures of Fermi acceleration. The basic CMT model is then extended by (a) including a magnetic field component in the invariant direction and (b) by making it asymmetric. It is found that the addition of a guide field does not change the characteristics of particle acceleration very much, but for the asymmetric models the associated energy gain is found to be much smaller than in symmetric models, because the particles can no longer remain very close to the trap centre throughout their orbit. The test particle method is then also applied to a CMT model from the literature which contains a magnetic X-line and open and closed field lines and the results are compared with the previous results and the findings in the literature. Finally, the theoretical framework of CMT models is extended to 2.5D models with shear flow and to fully 3D models, allowing the construction of more realistic CMT models in the future.
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Howdyshell, Marci Lynn. "Micro-magnetic Structures for Biological Applications." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1408718613.

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Eradat, Oskoui Solmaz. "New aspects of particle acceleration in collapsing magnetic traps." Thesis, University of St Andrews, 2014. http://hdl.handle.net/10023/11954.

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Collapsing magnetic traps (CMTs) have been suggested as one of the mechanisms that could contribute to particle energisation in solar flares. The basic idea behind CMTs is that charged particles will be trapped on the magnetic field lines below the reconnection region of a flare. This thesis discusses a number of important new aspects in particle energisation processes in CMTs, based on the model by Giuliani et al. (2005). In particular, we extend previous studies of particle acceleration in this CMT model to the relativistic regime and compare our results obtained using relativistic guiding centre theory with results obtained using the non-relativistic guiding centre theory. The similarities and differences found are discussed. We then present a detailed study of the question, what leads to the trapping or escape of particle orbits from CMTs. The answer to this question is investigated by using results from the non-relativistic orbit calculations with guiding centre theory and a number of simple models for particle energy gain in CMTs. We find that there is a critical pitch angle dividing trapped particle orbits from the escaping particle orbits and that this critical pitch angle does not coincide with the initial loss cone angle. Furthermore, we also present a calculation of the time evolution of an anisotropic pressure tensor and of the plasma density under the assumptions that they evolve in line with our kinematic MHD CMT model and that the pressure tensor satisfies the double-adiabatic Chew-Goldburger-Low (CGL) theory. Finally, we make a first step to introduce Coulomb scattering by a Maxwellian background plasma into our guiding centre equations by changing them into a set of stochastic differential equations. We study the influence of a static background plasma onto selected particle orbits by pitch angle scattering and energy losses, and look at its effect on the particle energy and the trapping conditions.
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Askitopoulos, Alexis. "Polariton condensates in optical traps and strong magnetic fields." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/386219/.

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Semiconductor Microcavities in the strong coupling regime are an ideal test bed for studying light matter interactions at the micro-scale. The eigenstates of these systems, exciton-polaritons, are bosonic hybrid light matter quasi-particles that have been demonstrated to undergo Bose condensation. Owing to their photonic component polaritons are lighter than atoms so their Bose-Einstein condensation (BEC) is attainable at higher temperatures than traditional BEC phase transitions in atomic systems, while the reduced dimensionality of the system has the implication that the BEC phase transition spontaneously occurs only in the presence of a confining potential. In this thesis, the underlying mechanisms of polariton condensation in optically imprinted trapping potential landscapes is examined. Condensation in the ground state of an optical trap, de-localised from the excitation light is demonstrated and investigated and the confined condensate is shown to exhibit well defined quantum mechanical properties. A comparative study of the observed spectral features with a condensate formed with typical non-resonant excitation methods is conducted revealing a significant reduction of the excitation density threshold due to efficient trapping and relaxation of polaritons inside the trap. Decoupling of the optically induced excitonic reservoir results in increased temporal coherence in this system by suppression of the strong interactions with un-condensed particles. Modification of the geometrical properties of the trap results in single excited-state condensation. Contrary to defect and stress induced trapping schemes the condensation process is here driven by polaritons injected into the potential-trap from the trap barriers. This leads to more efficient pumping of the energetically higher modes extending into the trap boundary. We demonstrate how this feature can be exploited to manifest transitions between energetically neighbouring coherent quantum states in the steady state dynamic equilibrium regime and in the transient domain were the intensity tuning of coherent tunnelling modes is also examined. A by-product of the localisation of the condensate inside the photonic trap and the decoupling from the reservoir is the strong susceptibility of this system to small imbalances in the optical pumping of spin states. The population of the two spin states of the condensate can be controlled by small imbalances of the circular components of the excitation. The high density regime in this configuration is then investigated where a linearisation of the polariton dispersion is observed under pulsed excitation. However, a vigorous examination of the transient dynamics in this regime demonstrates the artificial nature of this effect due to transient relaxation and momentum narrowing in the transition from photon lasing to a confined polariton condensate. The confined condensate is an ideal subject for studying strong magnetic field effects on the spin properties of polariton condensates as it emits in a single energy mode for a wide range of excitation powers above threshold compared to the "untrapped" case and doesn’t suffer from de-coherence effects induced from the reservoir that causes line broadening and inhibits the spectral resolution of the spin components. We have performed initial reference strong magnetic field experiments with "unconfined" polariton condensates and present the predicted density dependent collapse of the Zeeman splitting and the modulation of the previously observed paramagnetic screening by the polarisation of the exciting beam. In the final chapter of the thesis we investigate the modulation of the condensation threshold for the non-optically confined case by the application of a magnetic field in the Faraday geometry. The experimental observations are explained by a model based on the suppression of diffusion in the reservoir and the shrinking of the Bohr radius by the application of the magnetic field.
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Prikockis, Michael Vito. "Physics and Applications of Interacting Magnetic Particles: Effect of Patterned Traps." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1452073910.

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Han, Dian-jiun. "Bose-Einstein condensation of rubidium-87 atoms in a magnetic trap /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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Chen, Aaron. "Imprinted Magnetic Traps for Study on Particle Fluctuation, Ordering and Microfluidic Applications." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1364490203.

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Murgia, David. "Microchip ion traps with high magnetic field gradients for microwave quantum logic." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/48045.

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This thesis describes experimental work towards the development of a trapped-ion quantum computer based on microchip ion traps and long-wavelength radiation, using magnetic field gradients. The relationship between experimental parameters and two-qubit gate fidelity is investigated for microchips with two different static magnetic field gradient generation methods. For current-carrying wires and under-chip permanent magnets, optimum ion heights of 110 μm and 200 μm are found respectively. Construction of an experiment capable of demonstrating high-fidelity gates is reported, including innovations for the use of microchip ion traps with permanent magnets. The development of a vacuum system for versatile microchip experiments is described, including new methods for impedance-matched RF delivery, in-vacuum filtering and liquid nitrogen microchip cooling. Protection of both the microchip surface from atomic flux and of ions from the charged imaging viewport are both investigated in detail. A new preparation framework for microchip ion traps before their use in experiments is developed. In order to remove unwanted deposited layers on the microchips, a process of multiple chemical treatments is used. In addition, these characterisation efforts lead to refinement of the microfabrication process for future microchips. The application of large currents to microchips is of fundamental importance to scalable trapped-ion quantum computing using static magnetic field gradients. As part of the characterisation process, currents of ≈ 10A are successfully applied to microfabricated current-carrying wires, demonstrating the viability of these structures for generation of local magnetic fields and gradients in a quantum computing device. The operation of a microchip ion trap experiment with under-chip permanent magnets for a high magnetic field gradient (≈ 140Tm−1) is described. The successful trapping of ytterbium-174 and -171 ions is reported, as well as their use to measure and optimise the ion trap parameters. The thesis concludes with consideration of the expected future results from the ongoing operation of the experiment.
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Baranov, O. O. "Control of Ion Density Distribution by Use of Magnetic Traps for Plasma Electrons." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35384.

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Method of ion current density control in the vacuum arc deposition setup has been investigated. The control unit consisted of two electromagnetic coils installed under substrate of 400 mm dia. exposed to the plasma flux. A planar probe was used to measure the ion current density distribution along the plasma flux cross-sections at different distances from the plasma duct exit. It was shown that configuration of the resulting magnetic field generated by the control coils and the guiding and focusing coils of the arc source, strongly affects the ion current density distribution. Broad range of ion current density from 25 to 340 A/m2 was obtained at dependence on the control coils powering, distance from the plasma duct exit and the position along the substrate. This method may be suitable for effective controlling of the ion flux extracted from the plasma sources with guiding magnetic field, over the large substrates. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35384
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Myers, Jessica Ann, and Jessica Ann Myers. "Hybrid Optical-Magnetic Traps for Studies of 2D Quantum Turbulence in Bose-Einstein Condensates." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/625625.

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Turbulence appears in most natural and man-made flows. However, the analysis of turbulence is particularly difficult. Links between microscopic fluid dynamics and statistical signatures of turbulence appear unobtainable from the postulates of fluid dynamics making turbulence one of the most important unsolved theoretical problems in physics. Two-dimensional quantum turbulence (2DQT), an emerging field of study, involves turbulence in two-dimensional (2D) flows in superfluids, such as Bose-Einstein condensates (BECs). In 2D superfluids, a turbulent state can be characterized by a disordered distribution of numerous vortex cores. The question of how to effectively and efficiently generate turbulent states in superfluids is a fundamental question in the field of quantum turbulence. Therefore, experimental studies of vortex nucleation and the onset of turbulence in a superfluid are important for achieving a deeper understanding of the overall problem of turbulence. My PhD dissertation involves the study of vortex nucleation and the onset of turbulence in quasi-2D BECs. First, I discuss experimental apparatus advancements that now enable BECs to be created in a hybrid optical-magnetic trap, an atom trapping configuration conducive to 2DQT experiments. Next, I discuss the design and construction of a quantum vortex microscope and initial vortex detection tests. Finally, I present the first experiments aimed at studying 2DQT carried out in the updated apparatus. Thermal counterflow in superfluid helium, in which the normal and superfluid components flow in opposite directions, is known to create turbulence in the superfluid. However, this phenomenon has not been simulated or studied in dilute-gas BECs as a possible vortex nucleation method. In this dissertation, I present preliminary data from the first experiments aimed at understanding thermal counterflow turbulence in dilute-gas BECs.
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Books on the topic "Magnetic traps"

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Skovoroda, A. A. Magnitnye lovushki dli︠a︡ uderzhanii︠a︡ plazmy. Moskva: Fizmatlit, 2009.

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J, Bollinger John, Spencer Ross L, Davidson Ronald C, and Princeton Workshop on Nonneutral Plasma Physics (1999 : Princeton, New Jersey), eds. Non-neutral plasma physics III: Princeton, New Jersey, August, 1999. Melville, New York: AIP, 1999.

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1949-, Yamazaki K., ed. Design scalings and optimizations for super-conducting large helical devices. Nagoya, Japan: National Institute for Fusion Science, 1990.

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Gurūpu, Kakuyūgō Kagaku Kenkyūjo Ōgata Herikaru Sōchi Sekkei. Ōgata herikaru sōchi keikaku. [Tokyo]: Monbushō Kakuyūgō Kagaku Kenkyūjo Ōgata Herikaru Sōchi Sekkei Gurūpu, 1990.

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Kakuyūgō Kagaku Kenkyūjo. NIFS Kakuyūgō Kōgaku Kenkyū Purojekuto FFHR Sekkei Gurūpu. Herikaru-gata kakuyūgōro FFHR-d1 gainen sekkei chūkan hōkokusho. Toki-shi: Kakuyūgō Kagaku Kenkyūjo, 2013.

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A, Iiyoshi, ed. Design study of the large helical device. Nagoya, Japan: National Institute for Fusion Science, 1990.

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van Schooten, Kipp. Optically Active Charge Traps and Chemical Defects in Semiconducting Nanocrystals Probed by Pulsed Optically Detected Magnetic Resonance. Heidelberg: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00590-4.

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Joel, Fajans, Dubin Daniel H. E, and Non-Neutral Plasma Physics Symposium (1994 : Berkeley, Calif.), eds. Non-neutral plasma physics II: Berkeley, CA, July 1994. New York: AIP Press, 1995.

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Baker-Price, Laura. Trans-cerebral magnetic (TCM) therapy: An effective and non-invasive treatment for depression and epileptic spectrum disorder (ESD) following brain trauma. Sudbury, Ont: Laurentian University, School of Graduate Studies, 2005.

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Petecki, Zdzisław. Podłoże magnetyczne w pomorskim segmencie strefy szwu transeuropejskiego =: Magnetic basement in the Pomeranian segment of the Trans-European Suture Zone (NW Poland). Warszawa: Państwowy Instytut Geologiczny, 2008.

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Book chapters on the topic "Magnetic traps"

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Chirikov, B. V. "Particle Dynamics in Magnetic Traps." In Reviews of Plasma Physics, 1–91. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1777-7_1.

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Chirikov, B. V. "Particle Dynamics in Magnetic Traps." In Reviews of Plasma Physics, 1–91. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4615-7778-2_1.

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Vogel, Manuel. "Magnetic Bottles Implemented in Penning Traps." In Particle Confinement in Penning Traps, 345–63. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-55420-9_23.

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Somov, Boris V. "Collapsing Magnetic Traps in Solar Flares." In Astrophysics and Space Science Library, 213–74. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-4295-0_9.

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Vogel, Manuel. "Magnetic Bottles as Implemented in Penning Traps." In Particle Confinement in Penning Traps, 319–34. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-76264-7_21.

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Blaum, Klaus, and Günter Werth. "Precision Physics in Penning Traps Using the Continuous Stern-Gerlach Effect." In Molecular Beams in Physics and Chemistry, 247–61. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63963-1_13.

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Abstract“A single atomic particle forever floating at rest in free space” (H. Dehmelt) would be the ideal object for precision measurements of atomic properties and for tests of fundamental theories. Such an ideal, of course, can ultimately never be achieved. A very close approximation to this ideal is made possible by ion traps, where electromagnetic forces are used to confine charged particles under well-controlled conditions for practically unlimited time. Concurrently, sensitive detection methods have been developed to allow observation of single stored ions. Various cooling methods can be employed to bring the trapped ion nearly to rest. Among different realisations of ion traps we consider in this chapter the so-called Penning traps which use static electric and magnetic fields for ion confinement. After a brief discussion of Penning-trap properties, we consider various experiments including the application of the “continuous Stern-Gerlach effect”, which have led recently to precise determinations of the masses and magnetic moments of particles and antiparticles. These serve as input for testing fundamental theories and symmetries.
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Vogel, Manuel. "Application of the Continuous Stern Gerlach Effect: Magnetic Moments." In Particle Confinement in Penning Traps, 335–45. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-76264-7_22.

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Vogel, Manuel. "Application of the Continuous Stern Gerlach Effect: Magnetic Moments." In Particle Confinement in Penning Traps, 365–76. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-55420-9_24.

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Marcus, Frederick B. "Linear Magnetic Traps, Field Reversal and Taylor-State Configurations." In Systems Approaches to Nuclear Fusion Reactors, 371–400. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-17711-8_10.

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Freire, J. A. K., F. M. Peeters, A. Matulis, V. N. Freire, and G. A. Farias. "Magnetic traps for excitons in GaAs/AL x Ga1- x As quantum wells." In Springer Proceedings in Physics, 503–4. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59484-7_236.

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Conference papers on the topic "Magnetic traps"

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Bergeman, Thomas, and Harold Metcalf. "Magnetic trapping of neutral atoms." In International Laser Science Conference. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.wf6.

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Magnetic trapping of laser-cooled neutral atoms has been demonstrated at NBS and is progressing in other laboratories. Confinement of any object requires exchanging kinetic for potential energy, and for neutral atoms, this necessarily derives from shifts of internal energy levels. This is implemented through the force experienced by the atomic magnetic moment in a carefully designed, highly inhomogeneous field. Since magnetic fields of convenient strength can shift atomic energy levels by only a few gigahertz (temperature ≌ 0.1 K), neutral atom traps are very shallow and must be loaded with very cold atoms. We present some motivations for using magnetic traps and then discuss the constraints and optimal configurations of various arrangements. For example, no trap can be isotropic. Next we discuss both the classical and quantum mechanical motions of trapped atoms. These motions are important for at least two reasons: First, several schemes under study for further cooling depend on knowing the position and velocity of the atoms, as well as the vector field at each point along the orbit. Second, magnetic traps depend on the atomic moment remaining aligned with the field as the atom orbits in the trap, and this precludes rapid motion through a low-field region.
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Chu, Steven. "Laser cooling and trapping." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.tujj1.

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The purpose of this tutorial is to introduce the listener to the rapidly developing field of laser cooling and trapping. Doppler cooling is first discussed followed by the new mechanism of cooling based on ground-state energy level shifts in light fields with polarization gradients. Next, the basic concepts of magnetic traps, optical dipole force traps (optical tweezers), and the magnetooptic trap are considered. Selected uses of these traps and cooling techniques are given to elucidate the broad utility of these techniques.
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Zimmermann, C., J. Fortagh, H. Ott, S. Kraft, and A. Günther. "Bose-Einstein Condensates in Magnetic Micro Traps." In Proceedings of the XVIII International Conference on Atomic Physics. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812705099_0006.

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Pickel, Jason G., and Daniel G. Cole. "Controlling the Position of Magnetic Particles Using Adaptive Q-Parameterization." In ASME 2010 Dynamic Systems and Control Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/dscc2010-4048.

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Controlling the position of magnetic particles with magnetic traps for single molecule manipulation is difficult due to the complexity of the instrument. Currently, users are spending an immense amount of time designing compensators to satisfy their experimental conditions, yielding them minimal time to concentrate on their experiment. This paper discusses using adaptive Q-parametrized compensator methods to control the position of the particle. Incorporating adaptive control methods into the magnetic trap design can eliminate this issue by adjusting the controller parameters to ensure the performance of the instrument meets specific requirements. The adaptive Q-parametrized compensator structure has been incorporated into the design of the magnetic trap, resulting in the displacement of the particle being stabilized and the effects of the Brownian disturbances being reduced as the number of filter weight coefficients are increased.
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Phillips, William D. "Laser cooling, stopping, and magnetic trapping of neutral atoms." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.wv3.

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A thermal atomic Na beam is opposed by a resonantly tuned laser beam. The radiation pressure decelerates and compresses the thermal velocity distribution, bringing the average velocity to zero and reducing the width from ~1000 m/s to a few tens of m/s or less.1 The density of stopped atoms is > 106/cm3 within a bandwidth of a few m/ s. These densities and velocities are suitable for trapping by a number of proposed optical and magnetic traps. Using these stopped atoms, we have demonstrated the first electromagnetic trapping of neutral atoms. The trap, a magnetic quadrupole formed by two separated, coaxial, opposed current loops, confines the atoms by virtue of the force exerted on the Na magnetic dipole moment by the inhomogeneous magnetic field. The time constant for exponential decay of the atomic population in the trap is 0.83(7) s and is limited mainly by collisions with fast background gas atoms. The maximum velocity of atoms contained in the trap is 3.5 m/s, corresponding to a maximum energy of 17 mK.
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Pritchard, D. E., C. E. Wieman, E. L. Raab, R. N. Watts, V. Bagnato, and R. Stoner. "Light traps using spontaneous forces." In International Laser Science Conference. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.wf4.

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We propose several ideas for neutral atom traps which utilize spontaneous light forces produced by static laser beams. Although the “optical Earnshaw theorem”1 would seem to prohibit such traps, the theorem does not apply if the proportionality constant between force and light intensity is made to vary with position. We suggest possible ways to accomplish this: Zeeman tuning the atom’s resonant frequency by applying a changing magnetic field; varying the quantization axis of the system via a magnetic field cork-screw; utilizing optical pumping effects which arise from matrix element imbalances between hyperfine sublevels in certain atoms. These traps are true in the sense that they provide a potential energy minimum in three dimensions, as well as dissipative cooling. Compared with gradient force light traps, these traps are many times deeper, a million times larger, and can be operated cw.
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Kruglyakov, E. P. "Progress In Research On Open - Ended Magnetic Traps." In PLASMA 2005: Int. Conf. on Research and Applications of Plasmas; 3rd German-Polish Conf.on Plasma Diagnostics for Fusion and Applications; 5th French-Polish Seminar on Thermal Plasma in Space and Laboratory. AIP, 2006. http://dx.doi.org/10.1063/1.2168790.

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Dias da Silva, Luis G., and Rogério de Sousa. "Magnetic noise from Kondo charge traps (Presentation Recording)." In SPIE Nanoscience + Engineering, edited by Henri-Jean Drouhin, Jean-Eric Wegrowe, and Manijeh Razeghi. SPIE, 2015. http://dx.doi.org/10.1117/12.2186312.

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Ryzhkov, Sergei V., and Andrey V. Anikeev. "Improved Regimes in High Pressure Magnetic Discharges." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22212.

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Field-Reversed Configuration (FRC) [1] and Gas-Dynamic Trap (GDT) [2] represent compact system, which is a special magnetic geometry for plasma confinement. Theoretical and experimental study of gas-dynamic regimes with high energy content is carried out. The approach to a high beta (β is the ratio of plasma pressure to magnetic pressure) magnetic systems assumed different regimes of plasma with beta > 0.5 that is proper to compact devices such as tori and mirror traps. Both FRC and GDT traps are axial symmetric configurations, has open field lines and poloidal magnetic field only. Last experimental results on GDT have shown the possibility to build the stationary system with high beta. Analysis of the global energy and particle balance together with the Monte-Carlo equilibrium modelling allowed to conclude that two-component plasma confined in a steady-state regime. The characteristic plasma lifetimes are 4 to 5 times less then the experiment duration. A peripheral gas-puff near the mirror region enabled to maintain the radial profile of background plasma during the all neutral beam injection (NBI) pulse. This report is focused mainly on ambipolar effect and the possibility of further increasing the fast ion energy content and β. Improved gas-dynamic regimes in high pressure magnetic discharges and microinstabilities arising are described. Synthesized hot ion plasmoid (SHIP) experiment in the compact mirror section attached to the GDT central cell and the scheme of compact tori (FRC formation) for the compact mirror cell of GDT device are presented. Fusion prospects (reactor, neutron source, material studies) of such systems with high-energy (fast) particles [3, 4] and hybrid FRC + GDT scheme proposed by author from Bauman Moscow State Technical University (BMSTU) are discussed.
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Kecskemety, Karoly, Elena I. Daibog, Leonid L. Lazutin, Yury I. Logachev, and Jozsef Kota. "Jovian electrons and magnetic traps with inner acceleration regions." In The 34th International Cosmic Ray Conference. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.236.0120.

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Reports on the topic "Magnetic traps"

1

Libersky, Matthew Murray. Magnetic field mapping of the UCNTau magneto-gravitational trap: design study. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1154958.

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Nunes, Isadora, Katia Sá, Mônica Rios, Yossi Zana, and Abrahão Baptista. Non-invasive Brain Stimulation in the Management of COVID-19: Protocol for a Systematic Review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, December 2022. http://dx.doi.org/10.37766/inplasy2022.12.0033.

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Review question / Objective: What is the efficacy or effectiveness of NIBS techniques, specifically repetitive transcranial magnetic stimulation (rTMS), transcranial direct current stimulation (tDCS), transcranial alternating current stimulation (tACS), transcutaneous auricular vagus nerve stimulation (taVNS), percutaneous auricular vagus nerve stimulation (paVNS), and neck vagus nerve stimulation (nVNS), in the control of outcomes associated with COVID-19 in the acute or post-COVID persistent syndrome? Eligibility criteria: Included clinical studies assessed participants with acute or persistent post-COVID-19 syndrome submitted to NIBS interventions, namely transcranial direct current stimulation (tDCS), transcranial alternating current stimulation (tACS), transcranial random noise stimulation (tRNS), transcranial magnetic stimulation (TMS), repetitive transcranial magnetic stimulation (rTMS), theta burst (cTBS or iTBS). Studies that used peripheral and spinal cord stimulation techniques were also included. Those included vagus nerve stimulation (VNS), such as transcutaneous auricular (taVNS), percutaneous auricular (paVNS), transcranial random noise stimulation (tRNS) trans-spinal direct current stimulation (tsDCS) and other peripheral electrical stimulation (PES) techniques. Scientific communication, protocol studies, reviews and non-English papers were excluded.
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Sooryakumar, R. A Tunable Magnetic Trap Platform for Single Particle Manipulation. Fort Belvoir, VA: Defense Technical Information Center, August 2009. http://dx.doi.org/10.21236/ada514816.

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Salvat, Daniel. Measuring the Neutron Lifetime with a Magnetic Neutron Trap at LANL. Office of Scientific and Technical Information (OSTI), May 2014. http://dx.doi.org/10.2172/1130992.

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Fisher, Andrew. Magnetic Measurements of the Background Field in the Undulator Hall with Ductwork and Cable Trays. Office of Scientific and Technical Information (OSTI), November 2010. http://dx.doi.org/10.2172/992867.

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Raithel, Georg. Interactions of Cold Rydberg Atoms in a High-Magnetic-Field Atom Trap - Final Report. Office of Scientific and Technical Information (OSTI), June 2011. http://dx.doi.org/10.2172/1015766.

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Christopher, Morris, Gonzalez Frank, Fries Eric, Bailey T., Marie Blatnik, L. Broussard, N. Callahan, et al. Fill and dump measurement of the neutron lifetime using an asymmetric magneto-gravitational trap. Office of Scientific and Technical Information (OSTI), May 2022. http://dx.doi.org/10.2172/2377332.

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Lyatsky, H. V., J. R. Dietrich, and D. J. Edwards. Analysis of gravity and magnetic horizontal-gradient vector data over the buried Trans-Hudson Orogen and Churchill-Superior boundary zone in southern Saskatchewan and Manitoba. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1998. http://dx.doi.org/10.4095/209906.

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Mueller, C., S. J. Piercey, M. G. Babechuk, and D. Copeland. Stratigraphy and lithogeochemistry of the Goldenville horizon and associated rocks, Baie Verte Peninsula, Newfoundland. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328990.

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The Goldenville horizon in the Baie Verte Peninsula is an important stratigraphic horizon that hosts primary (Cambrian to Ordovician) exhalative magnetite and pyrite and was a chemical trap for younger (Silurian to Devonian) orogenic gold mineralization. The horizon is overlain by basaltic flows and volcaniclastic rocks, is intercalated with variably coloured argillites and cherts, and underlain by mafic volcaniclastic rocks; the entire stratigraphy is cut by younger fine-grained mafic dykes and coarser gabbro. Lithogeochemical signatures of the Goldenville horizon allow it to be divided into high-Fe iron formation (HIF; >50% Fe2O3), low-Fe iron formation (LIF; 15-50% Fe2O3), and argillite with iron minerals (AIF; <15% Fe2O3). These variably Fe-rich rocks have Fe-Ti-Mn-Al systematics consistent with element derivation from varying mineral contributions from hydrothermal venting and ambient detrital sedimentation. Post-Archean Australian Shale (PAAS)-normalized rare earth element (REE) signatures for the HIF samples have negative Ce anomalies and patterns similar to modern hydrothermal sediment deposited under oxygenated ocean conditions. The PAAS-normalized REE signatures of LIF samples have positive Ce anomalies, similar to hydrothermal sediment deposited under anoxic to sub-oxic conditions. The paradoxical Ce behaviour is potentially explained by the Mn geochemistry of the LIF samples. The LIF have elevated MnO contents (2.0-7.5 weight %), suggesting that Mn from hydrothermal fluids was oxidized in an oxygenated water column during hydrothermal venting, Mn-oxides then scavenged Ce from seawater, and these Mn-oxides were subsequently deposited in the hydrothermal sediment. The Mn-rich LIF samples with positive Ce anomalies are intercalated with HIF with negative Ce anomalies, both regionally and on a metre scale within drill holes. Thus, the LIF positive Ce anomaly signature may record extended and particle-specific scavenging rather than sub-oxic/redox-stratified marine conditions. Collectively, results suggest that the Cambro-Ordovician Taconic seaway along the Laurentian margin may have been completely or near-completely oxygenated at the time of Goldenville horizon deposition.
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