Dissertations / Theses on the topic 'Heavy ion reaction'
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De, Sanctis Jacopo <1977>. "Pattern recognition analysis on heavy ion reaction data." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/851/.
Full textBecker, Bruce. "Investigation of heavy ion reaction mechanisms by means of the inclusive 93Nb(12C,7Be) and 93Nb(12C,9Be) reactions." Master's thesis, University of Cape Town, 2002. http://hdl.handle.net/11427/6993.
Full textInclusive continuum cross-sections for the reactions 93Nb(12C,7Be) and 93Nb(12C,9Be) were measured at the NAC using a ΔE - E setup. A theoretical light output model which could account for the mass and charge dependance of the NaI E detectors was employed to calibrate the NaI(TI) detectors. The model is outlined and it is shown that the nonlinearity of the detector response is only due to a term which describes the mass-dependance. Investigation of the cross-sections revealed interesting facts about the dominant reaction mechanisms in the interaction of 120 with heavy targets. A theoretical model developed by the Milano group has been very successful in describing the continuum cross-sections of a particles (including 9Be) created in similar reactions of 120 and 160, incident on heavy targets. The analysis shows that the same description of the continuum cross-sections of 7Be and 9Be gives good agreement with the data (with different energy-loss parameters and survival probabilities), although there are discrepancies, especially at the lower incident angles. These small discrepancies may indicate the presence of a multistep direct reaction between the detected fragment and the residual nucleus in the exit channel. The most notable result of the analysis of the data was that the spectra of 7Be and 9Be, previously suspected to be created in a final-state interaction of sBe with the residual nucleus, are well-described by a friction-dissipative breakup mechanism.
Lauret, Jérôme. "Importance et évolution de l'énergie collective radiale en fonction de l'énergie d'excitation des systèmes formés au cours de la réaction Au+C à 1 GeV/nucléon." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10211.
Full textWang, Gang. "CORRELATIONS RELATIVE TO THE REACTION PLANE AT THE RELATIVISTIC HEAVY ION COLLIDER BASED ON TRANSVERSE DEFLECTION OF SPECTATOR NEUTRONS." Kent State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=kent1144770985.
Full textTurzo, Ketel. "Study of the 12C+197Au reaction at relativistic energies with the INDRA 4pi multidetector." Phd thesis, Université Claude Bernard - Lyon I, 2002. http://tel.archives-ouvertes.fr/tel-00002954.
Full textAtaol, Murat Tamer. "Multidimensional Quantum Tunnelling Formulation Of Oxygen-16 And Uranium-238 Reaction." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12605031/index.pdf.
Full textDanley, Tyler. "Measurement of Elliptic Flow Coefficients and Derivation of Reaction Plane Dependent Efficiency of Isolated Photons and ϖ0 in Center-of-Mass Pair Energy 200 GeV Au+Au Collisions at RHIC-PHENIX." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1416500118.
Full textKuznetsova, Inga Vladimirovna. "Particle Production in Matter at Extreme Conditions." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/193745.
Full textLiatard, Éric. "Mesures de sections efficaces totales de réaction avec des faisceaux d'ions lourds stables et radioactifs par la méthode du rayonnement associé." Grenoble 1, 1989. http://www.theses.fr/1989GRE10143.
Full textHashim, Hasnita. "Heavy ion transfer reactions." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306004.
Full textMacMillar, Susanna. "Isotopes as Mechanism Spies : Nucleophilic Bimolecular Substitution and Monoamine Oxidase B Catalysed Amine Oxidation Probed with Heavy Atom Kinetic Isotope Effects." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis (AUU), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7441.
Full textCharvet, Michael. "Recherche de l'apparition du phénomène de multifragmentation dans le système 32S+27Al." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10065.
Full textLo, Monaco L. "Nucleon transfer in heavy ion reactions." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371555.
Full textGilday, A. J. "Semiclassical theory of heavy ion fusion reactions." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376923.
Full textChabane, Amar. "Multifragmentation explosive dans la réaction 32S+27Al à 37. 5 MeV/nucléon." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10057.
Full textWindham, Gordon. "Spin dependence in heavy ion induced nuclear reactions." Thesis, University of Surrey, 1986. http://epubs.surrey.ac.uk/843452/.
Full textEvans, Philip Mark. "Fully relaxed heavy ion reactions in the mass 80 region." Thesis, University of Oxford, 1988. http://ora.ox.ac.uk/objects/uuid:3d0dc2d3-81a3-4842-a914-183c76dc4885.
Full textBarton, Robert Allan. "Multi-strange hyperon production in relativistic heavy -ion collisions." Thesis, University of Birmingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367744.
Full textBauge, Eric. "Collisions d'ions lourds aux énergies intermédiaires : étude de la dynamique d'émission des particules chargées et caractérisation des émetteurs." Université Joseph Fourier (Grenoble ; 1971-2015), 1994. http://www.theses.fr/1994GRE10086.
Full textCresswell, Alan James. "Studies of nuclear structure using heavy ion-induced transfer reactions." Thesis, University of Liverpool, 1994. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240215.
Full textBenatar, Marco. "Nucleon transfer from heavy-ion reactions using the AFRODITE gamma-ray spectrometer." Doctoral thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/6526.
Full textThe 1- radiation following the interactions of 1271 on 197 Au and 194Pt at ELAB = 730 MeV has been studied. The beam energy is approximately 9.5% above the Coulomb barrier. The aim of the present work is to study multi-nucleon transfer to and from the target. At energies above the Coulomb barrier, stripping and pickup reactions occur, quasi-elastic and deep-inelastic events dominate, with the target-like and projectile-like fragments remaining in contact over a sufficient period of time for degree of mass and NIZ ratio equilibration to occur. Relative intensities of various target-like fragments as well as projectile-like fragments have been extracted using the RADWARE and GRAZING program respectively. The spectroscopy of the fragments has been investigated by 1-1 coincidence techniques using the AFRODITE Spectrometer from the iThemba Laboratories. Isotopes of Au and Pt have been observed as well as other nuclei having lost or gained one to two protons in the process. Q-values are also calculated and plotted versus the relative intensities. The results of these plots are compared with the predictions of the GRAZING program. The aim of the present work is to determine whether the unpaired proton from both the projectile and the target influences the transfer of nucleons and whether the transfer is done in purely statistical way or again if the unpaired proton does playa part in the transfer. It was found that for both 1271 on 197 Au and 194Pt at ELAB = 730 MeV, the maximum number of transferred nucleons was only 4- and that the predictions from the GRAZING program do not agree with the extracted relative intensities from RADWARE.
Alshammari, Suliman. "Flowing afterglow studies of recombination of electrons with heavy Ions using FALP-MS." Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1S013/document.
Full textDissociative recombination (DR) is a process in which a positive molecular ion recombines with an electron and subsequently dissociates into neutral fragments. Among the different types of molecular ion-electron reactions DR deserves particular attention due to the important role it plays in low-temperature and low-density plasmas such as those encountered in planetary ionospheres and interstellar clouds. Despite the apparent simplicity of the DR reaction, its investigation has proven to be a difficult task from both experimental and theoretical perspectives. In order to shed more light upon this process the flowing afterglow technique has been introduced and utilised extensively for the last few decades. This thesis is devoted to experimental studies into the DR reaction using the flowing afterglow Langmuir probe mass spectrometer FALP-MS at the University of Rennes 1, in Rennes, France. The DR reaction at room temperature has been investigated for the acetone molecular ions ( ) and dimethylamine cations ( as well as the reaction rates of trimethylamine ( cations, and the obtained values were with uncertainties of ± 30 %. In addition, the electronic attachment to neutral dimethylamine was also studied and the rate constant was determined to be = 4.81 x 10-10 cm3 s-1. A new ion injection system system for the KACST electrostatic storage ring has been designed and built in the IPR laboratory in Rennes. The coupling of an ion source with a quadrupole mass analyzer and the use of a gas pulsing system to maintain the differential pumping between different regions of the injection line, is a novel technique for use with a storage ring. The final goal of this system is to study the reactivity of heavy ions such as biological molecular ions
Bauer, W., Burkhard Kämpfer, S. Wolf, and Hanns-Werner Barz. "Analysis of hard two-photon correlations measured in heavy-ion reactions at intermediate energies." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-31848.
Full textBauer, W., Burkhard Kämpfer, S. Wolf, and Hanns-Werner Barz. "Analysis of hard two-photon correlations measured in heavy-ion reactions at intermediate energies." Forschungszentrum Rossendorf, 1995. https://hzdr.qucosa.de/id/qucosa%3A22011.
Full textLotay, Gavin James. "Gamma-ray spectroscopy measurements for nuclear reactions in novae." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3893.
Full textWilkinson, H. L. "A study of simple nucleon transfer reactions between heavy ions and '1'9'7Au." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383930.
Full textTimmers, Heiko, and H. Timmers@adfa edu au. "Expressions of Inner Freedom." The Australian National University. Research School of Physical Sciences and Engineering, 1996. http://thesis.anu.edu.au./public/adt-ANU20020328.152158.
Full textBoztosun, Ismail. "Coupled-channels calculations for the scattering of deformed light heavy-ions : a challenge to the standard approach." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325373.
Full textLee, R. J. S. "Ion-atom collisions at relativistic and non-relativistic energies." Thesis, Queen's University Belfast, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368591.
Full textSilva, Nelson Canzian da. "Produção de fragmentos ricos em nêutrons através da fragmentação do 28Si com momento de Plab=14.6 GeV/c por nucleon." Universidade de São Paulo, 1994. http://www.teses.usp.br/teses/disponiveis/43/43131/tde-16122013-155237/.
Full textThe production of neutron-rich isotopes from the decay of 28Si projectile at Plab = 14.6 GeV/c per nucleon following the electromagnetic excitation by Al, Cu, Sn and Pb targets was investigated. The search was made triggering on neutron-rich ions (6He, 8He, 8Li, 9Li, 10Be, 11Be and 13B) detected in the BNL-AGS-E814 spectrometer. An upper limit of 54 ub (at the Confidence Level of 95%) for the electromagnetic dissociation cross-section for an individual channel is set, based on a data sample of ~ 3 x 107 beam particles. Inclusive cross section for the nuclear fragmentation production of those isotopes were measured and forward and transverse energy distribuitions were determined. From a comparison of the experimental momentum distributions for 6He and 9Li with the Goldhaber statistical fragmentation model an average value of 229±9 MeV/c for the Fermi momentum of the 28Si projectile was obtained.
Norman, Paul. "Hyperon production in p-BE interactions at 158 GeV/c per nucleon at the WA97 CERN experiment." Thesis, University of Birmingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396234.
Full textAlvarez, Marcos Aurelio Gonzalez. "Um método para determinação experimental da densidade da matéria nuclear." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-19022014-141107/.
Full textAn unfolding method is proposed to extract ground-state nuclear matter densities from heavy-ion elastic scattering data analyses at low (sub-barrier) and intermediate energies. The consistency of the results was fully checked. The method is a powerful tool to obtain ground-state nuclear matter densities, particularly at the surface region where the difference between densities of exotic and stable neighbor nuclei is very emphasized. Precise elastic scattering cross sections were measured for the systems 16O + 40Ca, 120Sn, with the aim of helping the construction of an experimental systematics for the real part of the nuclear interaction, and to obtain the experimental ground-state nuclear matter density for the 16O nucleus. As a complement, this work presents: i-) A theoretical systematics for nuclear densities which was performed for the whole mass region throughout the periodic table, ii-) the non-local model, developed to describe the energy dependence of the real part of the nuclear interaction; iii-) a new representation for the absorption of flux due to the reaction channels. This framework has allowed us to obtain a systematization of the optical potential from a consistent heavy-ion elastic scattering data analysis at low and intermediate energies. This analysis resulted a remarkable prediction for a very large elastic scattering cross section data set using a global and fundamental parameter-free model for the optical potential.
Turemen, L. M. "Investigation of the adsorption of reactive dyes and heavy metal ions from synthetic textile effluent by eggshell membrane." Thesis, Queen's University Belfast, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368526.
Full textMira, Joele Paulus. "The role played by quasi-elastic and inelastic break-up of the 12C and 16O projectiles in the production of intermediate mass fragments at 14-35 MeV/u." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85756.
Full textMoura, Marcia Maria de. "Determinação de Escalas Temporais para Reações entre Íons-pesados Leves através de Medidas de Correlações a Momentos Relativos Pequenos." Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/43/43131/tde-31082012-152500/.
Full textParticle-particle correlation measurements at small relative momenta for the 160+10B and 160+ 12C systems at Elab = 62.5 and 64 MeV, respectively, were performed at the University of São Paulo - Pelletron Laboratory. The experimental setup consisted of a hodoscope composed by fourteen triple telescopes which provide the energy for both light (Z 2 ) and heavy (Z>2) particles. Velocity difference (vdifl) spectra a nd correlation functions at small relative momenta were obtained for many particle pairs. The velocity difference spectrum provides information about the emission order for the particles. The anticorrelation region in the correlation function provides information about the time between the first and second emission. A simulation code that calculates sequencial emission from a compound nucleus and for which the emission order and time scale are parameters was used to fit both the vdiff spectrum and the correlation function. The time scales obtained for light particle correlations are between 10-20 and 10-19 s and they are in agreement with predictions for the evaporation of compound nuclei. Correlations between light and heavy particles give time scales of about 10 -20 which are compatible with fission of the residual nuclei after a light particle emission.
Trinh, Ngoc Duy. "Emission de neutrons par les réactions d'ions lourds (4,6-95 MeV/nucléon)." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMC234/document.
Full textHeavy-ion accelerators are an essential tool for nuclear physics research. They are also adopted in several applications. It is necessary to characterize the secondary neutrons production in order to guarantee a safe operation in every circumstance in accelerators. However, experimental data are very rare or even non-existent. For some data, we notice disagreements between different publications. Disagreements are also observed between measurements data and simulations. For all these reasons, we established the program Thick Target Neutron Yields (TTNY). This program aims to measure the double differential neutron spectra (energy, angle) generated by the interactions of heavy-ions (12≤Abeam≤208 and 4.6 MeV/nucleon≤Ebeam≤95 MeV/nucleon) on thick targets (natC, natCu and natNb). Two measurements methods were adopted: Activation and Time of Flight. This choice allows having a better confidence on the measurements, studying experimental limits and consolidating the conclusions that could be drawn from the experimental results. The measurements are compared to the simulations performed with some Monte-Carlo widely used in nuclear simulation: PHITS (Japanese), FLUKA (European (CERN/INFN)) and MCNP (American). These comparisons allowed evaluating the modeling quality of heavy-ion reactions for the energies and masses explored in this work. We also conclude on the systematic uncertainties and on the potential improvements to be introduced to physics models of these codes
Yilmaz, Bulent. "Stochastic Approach To Fusion Dynamics." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608517/index.pdf.
Full textElhage, Hicham. "Réaction 40Ca+natCu à 35 MeV/nucléon mesurée avec le multidétecteur AMPHORA : étude de l'énergie d'excitation et du moment angulaire du quasi-projectile reconstitué." Grenoble 1, 1992. http://www.theses.fr/1992GRE10145.
Full textBurgugi, Rogerio Gregorio. "Fragmentação nuclear em colisões de íons pesados a energias relativísticas." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-23102009-093957/.
Full textWe carried out a study of the forward neutral energy (En) and its correlation with the produced transverse energy (ET ) in collisions of 28Si ions (plab=14.6 GeV/c per nucleon) with Al, Cu, and Pb targets, investigated by Experiment 814 at the Brookhaven AGS. The correlation of the produced transverse energy with forward neutral energy from fragments 2H, 3H, 3He, 4He, 6He, 5Li and 6Li was also investigated. We find that the forward neutral energy En has a strong dependence on transverse energy ET produced in the collision. An efficient parametrization of this data set is accomplished through the use of a statistical model which relates the number of spectators in the collision to the number of neutrons detected in the forward direction. Momentum distributions of the fragments were investigated through the use of the Goldhaber model and the 0 parameter was calculated to each of the fragments in reactions of 28Si with Al, Cu and Pb targets.
Andgren, Karin. "Studies of collective phenomena in neutron deficient nuclei : by means of lifetime measurements, angular correlation measurements and the recoil decay tagging technique /." Doctoral thesis, KTH, Fysik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4693.
Full textSeddiki, Sélim. "Contribution au développement du détecteur de Vertex de l'expérience CBM et étude de faisabilité des mesures du flot elliptique des particules à charme ouvert." Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00862654.
Full textLamotte, Maxime. "Etude du signal optique des chambres à fission et évaluation de son exploitation pour un système de mesure neutronique d'un réacteur de génération IV Development and first use of an experimental device for fission-induced spectrometry applied to neutron flux monitoring SCENA: A simulation tool for radiation-induced gas scintillation Simulation of heavy-ion slowing-down tracks with the SCENA code Design and irradiation test of an innovative optical ionization chamber technology Pulse-reactor core monitoring with an innovative optical neutron detector." Thesis, Université Grenoble Alpes, 2021. http://www.theses.fr/2021GRALI023.
Full textThis PhD thesis details the study of luminescence produced in gaseous detectors as fission chambers, to evaluate its use in 4th generation nuclear reactor power monitoring, as ASTRID.Energy deposition in the gas, from heavy-ions produced during nuclear fission in a fission chamber is usually used for its charge generation ability, that can be detected with electrodes. Such method has been used since the beginning of atomic era present disadvantages, and necessary improvements have been assessed.By estimating fission chamber gas excited states production, one can deduce intrinsic light emission, and its detection by appropriate photo-detectors. Use of an optical signal against an electric one improves dependability of a neutron flux monitoring system, immune to electromagnetic noise.Spectroscopic studies of a nuclear plasma in a self-designed analytical device allows observation of typical gas scintillation emission lines. Analysis of emission lines reinforce optical detection attraction, as pressure and gas composition can be monitored online.Alongside our experiments, a simulation code dedicated to heavy-ions induced cold-plasma excited levels population has been produced to optimise future detectors relying on optical emission. Typical times encountered for excited states generation and their position around an ionization track have been estimated.Several neutron detector prototypes based on the sole gas scintillation principle have been assessed in cold neutron beam lines of the Orphée reactor, to validate a proof of concept for neutron monitoring. Experiments on the Cabri reactor allowed quantification of detection limit, linearity and dynamic range of our system.The positive outcomes provided by these 3 lines of work validate the proof of concept of passive, on-line, and self-diagnosed neutron detection with high dependability in harsh environments
Orr, Nigel Andrew. "Heavy-ion reaction studies of nuclei far from stability." Phd thesis, 1989. http://hdl.handle.net/1885/12477.
Full textSaloner, David Athol. "A semi-microscopic calculation of the potential in heavy ion collisions." Thesis, 2015. http://hdl.handle.net/10539/18602.
Full textVo-Phuoc, Kirsten. "Microscopic approach to heavy-ion reactions." Phd thesis, 2018. http://hdl.handle.net/1885/147216.
Full textWei, Jian Xin. "Barrier distributions in heavy ion induced fusion reactions." Phd thesis, 1993. http://hdl.handle.net/1885/138677.
Full text"Reduction of longitudinal emittance of ion beams caused by the variation in acceleration gap voltages." 2012. http://library.cuhk.edu.hk/record=b5549179.
Full text在論文的第一部分,我們研發了一種TSC 技術,它可以減少因粒子加速器的電壓變化而引起的縱向發射度增長。通過數值模擬,結果表明離子束的縱向發射度得到了約89% 的降低。如果把TSC 技術應用於重離子核聚變,離子束的縱向發射度就可以有效地被降低,從而促進更高效的核聚變反應。在論文的第二部分,我們以離子束的電流信號分析為基礎,研發了一種非干擾性的離子束能量測量方法。對於傳統干擾性的離子束能量測量,這種強調非干擾性的測量方法對未來重離子核聚變實驗以及高能粒子加速器研發都有實質的應用價值。在論文的第三部分,我們從NDCX 實驗數據分析中,證實離子束的電流信號能夠有效地揭示離子束微弱的能量變化。這個實驗結果相應肯定了論文第二部分的電流信號分析處理方法。在論文的第四部分,我們模擬在真實的NDCX 環境下測試TSC 技術。模擬結果表明TSC 技術可有效地把離子束的縱向發射度減少近89% ,從而證明了TSC 技術在實際應用中的能力。在論文的最後部分,我們在強電流離子束的一維波動行為中引入橫縱向稱合分析,解釋了一維波動行為與數值模擬結果之間的細小偏差。
Heavy Ion Fusion (HIF) is a technology that has the potential to provide an unlimited source of clean energy for human future. HIF works by shooting at a capsule containing Deuterium and Tritium with energetic heavy ion beams such that the huge amount of kinetic energy carried by the ions is converted into strong compression shock waves. DT fuel is then compressed to form a high temperature and high density hotspot at the center of the capsule, thus igniting nuclear fusion between Deuterium and Tritium. Over the past few decades, the fundamental concepts of HIF had been tested in scaled ex¬periments from the source injection to the reaction chamber. To achieve the highest performance of ignition, ion beams with low longitudinal emittance is demanded.
In the first part of the thesis, we developed a novel Two-Step Correction (TSC) technique to reduce the growth of longitudinal emittance in an induc¬tion linac driver caused by variations in acceleration gap voltages. Through numerical studies, we achieved a reduction of longitudinal emittance by about 89% for high perveance ion beams. As a spinoff from the formalism developed in this study, we developed in the second part of the thesis a new non-invasive approach for the measurement of ion beam energy. The proposed diagnostics may have practical utility for future HIF experiments, particularly as higher energy accelerators are developed. It works by a generalized time-of-flight method, using two adjacent beam current signals to reconstruct the beam velocity profile. In the third part of the thesis, we verified that beam current signals are capable to reveal small beam energy variations by an NDCX-I experiment performed at Lawrence Berkeley National Laboratory. The result of this experiment confirms the formalism of the new non-invasive approach for the ion beam energy determination based on beam current signal analysis. In order to verify the effectiveness of TSC in real drivers, we proposed a new NDCX-I experiment in the fourth part of the thesis to test the limitations and performance of the correction technique in real environment. Through simulations with real driver features considered, a reduction of 89% of longitudinal emittance was observed, which confirms the ability of TSC in real applications. In the last part of the thesis, we revealed the limitation of the 1-D cold fluid model deployed in our analysis of space-charge waves for high perveance ion beams. We showed that inaccuracies are caused by transverse-longitudinal coupling which could be included in the wave equation for space-charge dominated beams.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Woo, Ka Ming = 抑制由粒子加速器的電壓變化所引起的縱向發射度 / 胡家明.
Thesis (M.Phil.)--Chinese University of Hong Kong, 2012.
Includes bibliographical references (leaves 153-156).
Abstracts also in Chinese.
Woo, Ka Ming = Yi zhi you li zi jia su qi de dian ya bian hua suo yin qi de zong xiang fa she du / Hu Jiaming.
Abstract --- p.ii
概論 --- p.iv
Acknowledgement --- p.v
Chapter 1 --- Introduction --- p.1
Chapter 2 --- Background --- p.4
Chapter 2.1 --- Highlight --- p.4
Chapter 2.2 --- Introduction to fusion energy --- p.4
Chapter 2.3 --- Fusion technology --- p.5
Chapter 2.3.1 --- Magnetic confinement fusions --- p.5
Chapter 2.3.2 --- Inertial confinement fusions --- p.7
Chapter 2.4 --- Inertia confinement fusion --- p.9
Chapter 2.4.1 --- Principle of ICF --- p.9
Chapter 2.4.2 --- Implosion dynamics --- p.11
Chapter 2.4.3 --- Rayleigh-Taylor instability --- p.13
Chapter 2.4.4 --- Fast ignition --- p.14
Chapter 2.5 --- Heavy Ion Fusion --- p.16
Chapter 2.5.1 --- Comparison between laser and heavy ion driven fusions --- p.16
Chapter 2.5.2 --- Linear Induction Accelerator --- p.18
Chapter 2.6 --- Operation of a HIF driver --- p.20
Chapter 2.6.1 --- Source injection --- p.20
Chapter 2.6.2 --- Transport of ion beams --- p.21
Chapter 2.6.3 --- Acceleration of ion beams --- p.22
Chapter 2.6.4 --- Neutralized drift longitudinal compression --- p.24
Chapter 2.6.5 --- Target chamber --- p.25
Chapter 2.7 --- Transverse beam dynamics --- p.26
Chapter 2.7.1 --- Beam envelope equation --- p.26
Chapter 2.7.2 --- Matched beams solutions --- p.29
Chapter 2.8 --- Longitudinal beam dynamics --- p.30
Chapter 2.8.1 --- Cold plasma model --- p.30
Chapter 2.8.2 --- Self longitudinal electric field --- p.32
Chapter 2.8.3 --- Longitudinal emittance --- p.34
Chapter 2.9 --- Intense ion beam simulation --- p.35
Chapter 2.9.1 --- Particle-In-Cell method --- p.35
Chapter 2.9.2 --- WARP code --- p.36
Chapter 2.10 --- Conclusion --- p.37
Chapter 3 --- Techniques for correcting velocity and density fluctuations of ion beams --- p.39
Chapter 3.1 --- Highlight --- p.39
Chapter 3.2 --- The quest for short-pulse length ion beams --- p.40
Chapter 3.2.1 --- Applications of short-pulse ion beams --- p.40
Chapter 3.2.2 --- Consequence of the growth of longitudinal emittance --- p.41
Chapter 3.3 --- Effect of gap voltage variation on εzn --- p.42
Chapter 3.3.1 --- Description of simulation scenario --- p.42
Chapter 3.3.2 --- The coasting of an unperturbed ion beam and a velocitytilt beam --- p.43
Chapter 3.3.3 --- Effect of many constant voltage gaps --- p.44
Chapter 3.3.4 --- Effect of non-uniform voltage gap --- p.46
Chapter 3.4 --- One-step correction --- p.48
Chapter 3.4.1 --- Criteria for the one-step correction --- p.52
Chapter 3.4.2 --- Space-charge dominated beams --- p.55
Chapter 3.5 --- Two-step correction --- p.56
Chapter 3.5.1 --- Principle of two-step correction --- p.56
Chapter 3.5.2 --- Result of two-step correction --- p.59
Chapter 3.6 --- Conclusion --- p.62
Chapter 4 --- A new non-invasive approach for the measurement of ion beam energy --- p.63
Chapter 4.1 --- Highlight --- p.63
Chapter 4.2 --- Introduction --- p.64
Chapter 4.3 --- Derivation of the ion beam energy based on two current signals --- p.65
Chapter 4.3.1 --- Obtaining the time evolution of the beam current --- p.65
Chapter 4.3.2 --- Deriving the beam energy profile --- p.67
Chapter 4.3.3 --- Obtaining the average velocity --- p.70
Chapter 4.4 --- Checking the beam energy profile with 3-D PIC simulations --- p.72
Chapter 4.4.1 --- Determination of the average velocity --- p.73
Chapter 4.4.2 --- Computation of the beam energy profile --- p.74
Chapter 4.5 --- Signal magnification --- p.74
Chapter 4.6 --- Error propagations --- p.77
Chapter 4.7 --- Conclusion --- p.81
Chapter 5 --- Experimental verification of the beam current signal amplification --- p.83
Chapter 5.1 --- Highlight --- p.83
Chapter 5.2 --- Introduction to NDCX-I --- p.84
Chapter 5.3 --- Design of the NDCX-I experiment --- p.88
Chapter 5.4 --- Voltage profiles applied at the source plate --- p.90
Chapter 5.4.1 --- Marx voltage profile --- p.90
Chapter 5.4.2 --- Voltage modulation --- p.91
Chapter 5.5 --- Signal amplification of beam currents measured at the Faraday cup --- p.92
Chapter 5.6 --- Modeling of the space-charge wave propagation --- p.94
Chapter 5.6.1 --- Solving for the line-charge density profile at the source plate --- p.94
Chapter 5.6.2 --- Procedure of space-charge wave modeling --- p.99
Chapter 5.7 --- Conclusion --- p.101
Chapter 6 --- Implementation of Two-Step Correction in NDCX-I --- p.103
Chapter 6.1 --- Highlight --- p.103
Chapter 6.2 --- Application of the current signal analysis to the Two-Step Correction --- p.104
Chapter 6.3 --- Proposal of the new NDCX-I experiment --- p.107
Chapter 6.3.1 --- Design of the beamline --- p.107
Chapter 6.3.2 --- Description of the simulation scenario --- p.110
Chapter 6.3.3 --- Result of the Two-Step Correction simulation --- p.114
Chapter 6.4 --- Conclusion --- p.126
Chapter 7 --- Transverse-Longitudinal coupling in the wave equation --- p.128
Chapter 7.1 --- Highlight --- p.128
Chapter 7.2 --- Phenomenological study of residue --- p.129
Chapter 7.2.1 --- Description of the simulation scenario --- p.129
Chapter 7.2.2 --- Modeling of the velocity wave --- p.131
Chapter 7.2.3 --- Phenomenon of residue --- p.133
Chapter 7.3 --- Review of the space-charge wave equation --- p.141
Chapter 7.3.1 --- Fluid description of ion beams --- p.141
Chapter 7.3.2 --- Beam envelope perturbation --- p.145
Chapter 7.4 --- Conclusion --- p.149
Chapter 8 --- Conclusion --- p.150
Bibliography --- p.153
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