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On the Role of Ionization Physics in Intense Laser-Plasma Interactions
On the Role of Ionization Physics in Intense Laser-Plasma Interactions
On the Role of Ionization Physics in Intense Laser-Plasma Interactions

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152954
ISBN  
9798384042181
DDC  
530
저자명  
DiIorio, Stephen Edward.
서명/저자  
On the Role of Ionization Physics in Intense Laser-Plasma Interactions
발행사항  
[Sl] : University of Michigan, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
209 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
주기사항  
Advisor: Thomas, Alexander G. R.
학위논문주기  
Thesis (Ph.D.)--University of Michigan, 2024.
초록/해제  
요약Ionization is critical in the formation and evolution of plasma dynamics; collisional ionization, in particular, is an often overlooked source of electrons when dealing with laser-plasma interactions. It, however, plays a crucial role in understanding the complex plasma kinetics, ranging from cold and sparse astrophysical settings to hot and dense fusion systems. This dissertation presents a new, deterministic algorithm that adds collisional ionization physics to particle-in-cell (PIC) codes. This algorithm offers improved accuracy, achieving up to two orders of magnitude decrease in the error of the ionization rate calculations versus the alternatives, scales linearly in execution time with the number of macro-particles per cell, and was rigorously tested for physical correctness. The first simulation study we present using this new algorithm examines a method of measuring the collisional relaxation time of a plasma with picosecond resolution through the evolution of short-pulse laser-generated plasma. We describe the evolution of a two-temperature plasma, created due to above-threshold ionization, that expands from ∼1 μm to a radius of ≈50 μm and is sustained due to the balancing currents of these "hot", 500 eV, and "cold", 100 eV, electrons. Our second study offers a model and supporting simulations for the stable generation of low divergence (≤20 mrad) proton beams from a novel liquid sheet target. Through the generation of a cold electron plasma (≲100 eV) via proton-impact ionization of a background water vapor, these proton beams drive a single filament Weibel instability, which causes the rapid growth of an azimuthal magnetic field that focuses these protons over long distances (cm scale). These studies provide a novel look at laser-plasma interactions that explore the dynamics of collisional ionization and its interplay with the plasma kinetics and are in good agreement with experimental data. Finally, our algorithm offers an alternative means of simulating collisional ionization inside a PIC framework that could easily be expanded, along with its described benefits, to include any other ionization or recombination scheme a user may desire.
일반주제명  
Physics
일반주제명  
Plasma physics
일반주제명  
Computational physics
키워드  
Collisional ionization
키워드  
Plasma
키워드  
Particle-in-cell
기타저자  
University of Michigan Physics
기본자료저록  
Dissertations Abstracts International. 86-03B.
전자적 위치 및 접속  
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MARC

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■020    ▼a9798384042181
■035    ▼a(MiAaPQ)AAI31631073
■035    ▼a(MiAaPQ)umichrackham005632
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aDiIorio,  Stephen  Edward.
■24510▼aOn  the  Role  of  Ionization  Physics  in  Intense  Laser-Plasma  Interactions
■260    ▼a[Sl]▼bUniversity  of  Michigan▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a209  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-03,  Section:  B.
■500    ▼aAdvisor:  Thomas,  Alexander  G.  R.
■5021  ▼aThesis  (Ph.D.)--University  of  Michigan,  2024.
■520    ▼aIonization  is  critical  in  the  formation  and  evolution  of  plasma  dynamics;  collisional  ionization,  in  particular,  is  an  often  overlooked  source  of  electrons  when  dealing  with  laser-plasma  interactions.  It,  however,  plays  a  crucial  role  in  understanding  the  complex  plasma  kinetics,  ranging  from  cold  and  sparse  astrophysical  settings  to  hot  and  dense  fusion  systems.  This  dissertation  presents  a  new,  deterministic  algorithm  that  adds  collisional  ionization  physics  to  particle-in-cell  (PIC)  codes.  This  algorithm  offers  improved  accuracy,  achieving  up  to  two  orders  of  magnitude  decrease  in  the  error  of  the  ionization  rate  calculations  versus  the  alternatives,  scales  linearly  in  execution  time  with  the  number  of  macro-particles  per  cell,  and  was  rigorously  tested  for  physical  correctness.  The  first  simulation  study  we  present  using  this  new  algorithm  examines  a  method  of  measuring  the  collisional  relaxation  time  of  a  plasma  with  picosecond  resolution  through  the  evolution  of  short-pulse  laser-generated  plasma.  We  describe  the  evolution  of  a  two-temperature  plasma,  created  due  to  above-threshold  ionization,  that  expands  from  ∼1  μm  to  a  radius  of  ≈50  μm  and  is  sustained  due  to  the  balancing  currents  of  these  "hot",  500  eV,  and  "cold",  100  eV,  electrons.  Our  second  study  offers  a  model  and  supporting  simulations  for  the  stable  generation  of  low  divergence  (≤20  mrad)  proton  beams  from  a  novel  liquid  sheet  target.  Through  the  generation  of  a  cold  electron  plasma  (≲100  eV)  via  proton-impact  ionization  of  a  background  water  vapor,  these  proton  beams  drive  a  single  filament  Weibel  instability,  which  causes  the  rapid  growth  of  an  azimuthal  magnetic  field  that  focuses  these  protons  over  long  distances  (cm  scale).  These  studies  provide  a  novel  look  at  laser-plasma  interactions  that  explore  the  dynamics  of  collisional  ionization  and  its  interplay  with  the  plasma  kinetics  and  are  in  good  agreement  with  experimental  data.  Finally,  our  algorithm  offers  an  alternative  means  of  simulating  collisional  ionization  inside  a  PIC  framework  that  could  easily  be  expanded,  along  with  its  described  benefits,  to  include  any  other  ionization  or  recombination  scheme  a  user  may  desire.
■590    ▼aSchool  code:  0127.
■650  4▼aPhysics
■650  4▼aPlasma  physics
■650  4▼aComputational  physics
■653    ▼aCollisional  ionization
■653    ▼aPlasma
■653    ▼aParticle-in-cell
■690    ▼a0759
■690    ▼a0605
■690    ▼a0216
■71020▼aUniversity  of  Michigan▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-03B.
■790    ▼a0127
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164369▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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