Дисертації з теми "Ion cyclotron waves"
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Teodorescu, Catalin. "Laboratory investigation of electrostatic ion waves modified by parallel-ion-velocity shear." Morgantown, W. Va. : [West Virginia University Libraries], 2003. http://etd.wvu.edu/templates/showETD.cfm?recnum=2901.
Повний текст джерелаTitle from document title page. Document formatted into pages; contains xiv, 215 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 107-113).
Nguyen, Son Thanh Perez Joseph D. "Interactions between electromagnetic ion cyclotron waves and protons in the magnetosphere SCATHA Results /." Auburn, Ala., 2007. http://hdl.handle.net/10415/1380.
Повний текст джерелаHannan, Abdul. "Modelling Ion Cyclotron Resonance Heating and Fast Wave Current Drive in Tokamaks." Doctoral thesis, KTH, Fusionsplasmafysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-119930.
Повний текст джерелаQC 20130327
De, Soria-Santacruz Pich Maria. "Controlled precipitation of energetic Van Allen belt protons by electromagnetic ion cyclotron (EMIC) waves : scientific and engineering implications." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/87127.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 235-247).
The inner Van Allen radiation belt traps highly energetic protons sourced from solar storms, cosmic rays and other processes. These particles can rapidly damage the space systems orbiting the inner region, limiting access to Low Earth Orbit (LEO). Decades of modeling and observations, however, show that naturally generated ULF/VLF waves have the capability of precipitating energetic trapped electrons and protons. This fact suggests that there could be human control over the stable inner belt proton population by artificially transmitting Electromagnetic Ion Cyclotron (EMIC) waves from space-based antennas (named remediation). These waves are naturally generated by equatorial ring current ions in the outer belt region, which explains the absence of EMIC waves at lower altitudes. Consequently, the precipitation of high-energy protons requires artificial generation of EMIC waves into the inner zone. The controlled removal of energetic outer belt electrons by man-made whistler waves has been widely studied, and a space test of a linear antenna for this purpose is in preparation. Contrarily, the interaction between inner belt protons and EMIC waves from in-situ transmitters is an unexplored solution to the radiation environment that should be addressed given its relevance to the scientific and engineering communities. This dissertation focuses on four interconnected research efforts in this direction, which are (1) the radiation of EMIC waves from a space-based antenna, (2) the propagation of these waves in the inner radiation belt, (3) the wave-particle interactions with energetic trapped protons and (4) the feasibility of a mission capable of significantly reducing this hazardous radiation. Our analyses show that a DC rotating coil antenna would be capable of radiating EMIC waves into space. Magnetic dipoles, however, have a very small radiation resistance. Additionally, the interaction between these waves and energetic protons is very inefficient. Our simulations show that, with the current technology, it is not engineeringly feasible to clean up the proton belt using space-based transmitters. A mission scaled down to detectability of the precipitating protons, however, could be launched easily and would allow us to better understand the science and test the technology involved in the concept of remediation.
by Maria de Soria-Santacruz Pich.
Ph. D.
Urbanczyk, Guillaume. "Interaction of High-Power waves with the plasma periphery of WEST & EAST tokamaks." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0181.
Повний текст джерелаThis thesis aims at studying phenomena by which Ion Cyclotron Resonance Heating (ICRH) induces interactions between the plasma and the walls of tokamaks, the plasma-metal interactions being deleterious not only to prevent vessel materials degradation but also not to affect plasma performance due to the presence of heavy metallic impurity compared to foreseen fuel (namely deuterium and tritium). This problematic basically affects any machine aiming at heating the ions with waves at the ion cyclotron frequency, which in particular will be the case of ITER. This thesis is the result of a collaboration between CEA Cadarache (France) and the Institute of Plasma Physics in Hefei (China). Various experimental work have been carried out on the EAST (China) and WEST (France) tokamaks in order to identify the relevant parameters allowing to optimize the efficiency by which the ICRF waves – used to heat the plasma – must be excited in order to maximize the amount of power coupled, while simultaneously minimizing the plasma interactions with the walls due to this type of waves and the so called radiofrequency sheath excitation
Kwon, Myeun. "Fast wave ion cyclotron resonance heating experiments on the advanced toroidal facility." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/13015.
Повний текст джерелаHedin, Johan. "Ion cyclotron resonance heating in toroidal plasmas." Doctoral thesis, KTH, Alfvén Laboratory, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3073.
Повний текст джерелаShepard, Thomas Donavon. "Fast wave ion cyclotron resonance heating experiments on the Alcator C tokamak." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14402.
Повний текст джерелаJohnson, Thomas. "Fast wave heating of cyclotron resonant ions in tokamaks." Doctoral thesis, KTH, Alfvénlaboratoriet, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3771.
Повний текст джерелаChang, Ouliang. "Numerical Simulation of Ion-Cyclotron Turbulence Generated by Artificial Plasma Cloud Release." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/34018.
Повний текст джерелаMaster of Science
Kubota, Yuko. "Study on Variation of Radiation Belt Electron Fluxes Through Nonlinear Wave-Particle Interactions." Kyoto University, 2018. http://hdl.handle.net/2433/232003.
Повний текст джерелаLu, LingFeng. "Modelling of plasma-antenna coupling and non-linear radio frequency wave-plasma-wall interactions in the magnetized plasma device under ion cyclotron range of frequencies." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0173/document.
Повний текст джерелаIon Cyclotron Resonant Heating (ICRH) by waves in 30-80MHz range is currently used in magnetic fusion plasmas. Excited by phased arrays of current straps at the plasma periphery, these waves exist under two polarizations. The Fast Wave tunnels through the tenuous plasma edge and propagates to its center where it is absorbed. The parasitically emitted Slow Wave only exists close to the launchers. How much power can be coupled to the center with 1A current on the straps? How do the emitted radiofrequency (RF) near and far fields interact parasitically with the edge plasma via RF sheath rectification at plasma-wall interfaces? To address these two issues simultaneously, in realistic geometry over the size of ICRH antennas, this thesis upgraded and tested the Self-consistent Sheaths and Waves for ICH (SSWICH) code. SSWICH couples self-consistently RF wave propagation and Direct Current (DC) plasma biasing via non-linear RF and DC sheath boundary conditions (SBCs) at plasma/wall interfaces. Its upgrade is full wave and was implemented in two dimensions (toroidal/radial). New SBCs coupling the two polarizations were derived and implemented along shaped walls tilted with respect to the confinement magnetic field. Using this new tool in the absence of SBCs, we studied the impact of a density decaying continuously inside the antenna box and across the Lower Hybrid (LH) resonance. Up to the memory limits of our workstation, the RF fields below the LH resonance changed with the grid size. However the coupled power spectrum hardly evolved and was only weakly affected by the density inside the box. In presence of SBCs, SSWICH-FW simulations have identified the role of the fast wave on RF sheath excitation and reproduced some key experimental observations. SSWICH-FW was finally adapted to conduct the first electromagnetic and RF-sheath 2D simulations of the cylindrical magnetized plasma device ALINE
Suárez, López Guillermo [Verfasser], and Hartmut [Akademischer Betreuer] Zohm. "Effect of non-axisymmetric tokamak plasmas on the coupling performance of ion cyclotron wave antennas / Guillermo Suárez López ; Betreuer: Hartmut Zohm." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2020. http://d-nb.info/1227840101/34.
Повний текст джерелаLaxåback, Martin. "Fast wave heating and current drive in tokamaks." Doctoral thesis, KTH, Alfvénlaboratoriet, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118.
Повний текст джерелаQC 20100506
Yeh-WeiYang and 楊業葳. "Crossover Frequencies of Ion-Cyclotron Waves in Three-Ion Plasmas." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/89097522212204791578.
Повний текст джерела國立成功大學
太空與電漿科學研究所
102
The crossover frequency in plasma is a frequency at which the wave can change polarization and convert to another mode such as from right-hand whistler-mode to left-hand ion-cyclotron waves when the wave vector is parallel to the field lines. This frequency occurs in multi-ion plasma and their values would vary as the compositions/percentages of background ion species vary. In the thesis, we not only derive the 2-ion and 3-ion plasma’s formula of the crossover frequency but also use the crossover frequencies of ion whistlers observed by DEMETER satellite to calculate the percentages of each ion species at the observational site. Finally, for further application to analyze data from satellite missions, the crossover frequencies over different percentages for each ion species are normalize to proton gyrofrequency.
Yi-LingLin and 林怡伶. "Distribution of Water Group Ion Cyclotron Waves in Saturn’s Magnetosphere." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/18256004348265729748.
Повний текст джерелаUsanova, Maria. "Generation of Electromagnetic Ion Cyclotron (EMIC)Waves in a Compressed Dayside Magnetosphere." Phd thesis, 2010. http://hdl.handle.net/10048/1525.
Повний текст джерелаCapannolo, Luisa. "Energetic electron precipitation into the Earth's upper atmosphere driven by electromagnetic ion cyclotron waves." Thesis, 2020. https://hdl.handle.net/2144/40353.
Повний текст джерелаBrowning, Jim. "Interchange stabilization of a mirror plasma using radio-frequency waves below the ion cyclotron frequency." 1988. http://catalog.hathitrust.org/api/volumes/oclc/19491617.html.
Повний текст джерелаTypescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 108-114).
Sund, Richard Stewart. "Power conservation for linear waves in the ion-cyclotron range of frequencies in nonuniform hot plasmas." 1986. http://catalog.hathitrust.org/api/volumes/oclc/15598410.html.
Повний текст джерелаTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 63-64).
Halford, Alexa J. "EMIC wave association with gepmagnetic storms, the plasmasphere, and the radiation belts." Thesis, 2012. http://hdl.handle.net/1959.13/933260.
Повний текст джерелаElectromagnetic Ion Cyclotron (EMIC) waves have recently been considered an important process in the magnetosphere and in particular contribute to electron loss in the radiation belts. Here we describe the characteristics of EMIC waves under different magnetospheric conditions, their relationship to the plasmasphere and plasmaspheric plumes, and start examining the ability of EMIC waves to resonate with radiation belt electrons using data from the Combined Release and Radiation Effect Satellite (CRRES). The CRRES mission was operational from 25 July, 1990 until 21 October, 1991. It had an orbital period of 9 hrs and 52 minutes and was able to observe the magnetospheric region of 3 < L < 8, magnetic local times (MLT) between 14:00 - 08:00 hr, and magnetic latitudes (Mlat) between ±30. CRRES observed 913 EMIC waves and 124 geomagnetic storms. Due to the lack of coverage around noon, the majority of EMIC waves were found to occur in the dusk sector at MLT = 15 hr and at L = 6. The highest occurrence rates for EMIC waves occurred during the main phase of geomagnetic storms, when it is expected that there may be overlap between the cold plasmaspheric plasma and the hot ring current plasma. The role of the cold plasmaspheric plasma has been examined. It was found that EMIC waves were observed in regions with enhanced cold plasma densities under all magneto- spheric conditions except for the pre-onset phase of a geomagnetic storm, which may be due to the small number of events. As CRRES was not always able to observe the bound- aries of either the plasmasphere or a plasmaspheric plume during each orbit, a superposed epoch was created of the observed densities at L-values between 3 and 8 for the region between 14 hr< MLT <18 hr, the region where plasmaspheric plumes are expected to be observed, for each phase of the 124 geomagnetic storms observed by CRRES. Dur- ing the main phase of the geomagnetic storms, an increase in the plasmaspheric number density was observed between 5 < L < 7. This is consistent with the idea of plasmas- pheric plumes forming during this phase. However, the mean location of the EMIC wave events during the main phase of a geomagnetic storm falls in the middle of the plume, not on the boundary as suggested by some theories. It has been predicted that EMIC waves need negative density gradients in order to grow to observable levels and to propagate effectively through the magnetosphere. No significant correlation between local density gradients and the occurrence of EMIC waves was found. EMIC waves have been suggested as a mechanism for electron particle loss in the radiation belts. It was found that for electrons with energies of 1.25 - 10 MeV, there were EMIC wave events where the pitch angle diffusion extended into the loss cone. It is expected that after bounce averaging the diffusion coefficients will exceed the strong diffusion regime under most magnetospheric conditions for electron energies between 1.25 and 2 MeV. On average the highest diffusion coefficients were observed during the main phase of geomagnetic storms. CRRES has greatly increased the communities understanding of EMIC waves and their role within the Earth-Space environment. It has been shown where and when to expect to see these waves, how plumes, but more importantly enhanced cold plasma den- sities, play a large role in EMIC wave occurrence, and how EMIC waves are able to resonate with radiation belt electrons contributing to the main phase loss in the radiation belts. This thesis concludes with a look towards continuations of this work and future research projects which will help address some of the raised and unanswered questions throughout the thesis.
Lee, Jar-Lon. "Wave coupling and matching of waveguide couplers in the ion cyclotron range of frequencies." 1988. http://catalog.hathitrust.org/api/volumes/oclc/19403076.html.
Повний текст джерелаLafleur, Trevor. "Helicon Wave Propagation in Low Diverging Magnetic Fields." Phd thesis, 2011. http://hdl.handle.net/1885/8676.
Повний текст джерела