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Direct Laser Acceleration in Ultra-High-Intensity Laser-Plasma Interactions: Higher-Order Resonances, X-Ray Emission, and Radiation Reaction Effects
Direct Laser Acceleration in Ultra-High-Intensity Laser-Plasma Interactions: Higher-Order Resonances, X-Ray Emission, and Radiation Reaction Effects
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103613
- ISBN
- 9798288804779
- DDC
- 530
- 저자명
- Yeh, I-Lin.
- 서명/저자
- Direct Laser Acceleration in Ultra-High-Intensity Laser-Plasma Interactions: Higher-Order Resonances, X-Ray Emission, and Radiation Reaction Effects
- 발행사항
- [Sl] : University of California, San Diego, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 187 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
- 주기사항
- Advisor: Arefiev, Alexey.
- 학위논문주기
- Thesis (Ph.D.)--University of California, San Diego, 2025.
- 초록/해제
- 요약This dissertation investigates direct laser acceleration (DLA) of electrons in ultra-intense laser-plasma interactions, emphasizing how plasma-generated fields, laser frequency modulation, and radiation friction influence electron dynamics and radiation output. In the DLA regime, a laser propagating through underdense plasma can transfer energy efficiently to electrons, especially when assisted by quasi-static plasma fields. These fields induce betatron oscillations that confine electrons transversely while enabling resonant interactions with the laser field. A key mechanism in DLA is betatron resonance, which occurs when the betatron oscillation frequency matches the average frequency of the laser field experienced by the electron, resulting in net energy gain.The first part of this work uncovers a new DLA regime driven by frequency modulation of the laser field as perceived by the oscillating electron. This modulation enables net energy gain through a third-order resonance-a specific higher-order resonance where the laser completes three oscillations per betatron cycle. In the absence of modulation, energy gain and loss cancel out; with modulation, the oscillation slows near the electron's turning points, allowing net gain. Additionally, the study shows that superluminal laser phase velocities enhance higher-order resonances by introducing a global minimum in the frequency ratio between the laser and betatron oscillations. This effect suppresses detuning and sustains resonance over a broader energy range, providing a more robust pathway for energy transfer in relativistic DLA.The second part of the dissertation shifts focus to x-ray emission and radiation reaction effects. Using particle-in-cell simulations, a backward x-ray emission mechanism is identified in which laser-accelerated electrons are turned around by the plasma field at the density down-ramp and re-collide with the exiting laser pulse, emitting hard x-rays. The resulting backward-directed photon source is more collimated and compact than its forward counterpart, with comparable or higher conversion efficiency. Finally, a test-particle model incorporating radiation friction reveals an attractor effect driven by plasma-induced superluminosity, where electrons converge to similar energy and radiation outputs despite varying initial conditions. These findings provide new insight into the interplay between laser dynamics, plasma fields, and radiation processes-advancing the design of compact, high-brightness electron and photon sources for future high-intensity laser facilities.
- 일반주제명
- Physics
- 일반주제명
- Nuclear physics
- 일반주제명
- Applied physics
- 일반주제명
- Electromagnetics
- 일반주제명
- Plasma physics
- 키워드
- High power laser
- 키워드
- X-ray source
- 키워드
- Betatron
- 기타저자
- University of California, San Diego Physics
- 기본자료저록
- Dissertations Abstracts International. 87-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017357885
■00520260202103613
■006m o d
■007cr#unu||||||||
■020 ▼a9798288804779
■035 ▼a(MiAaPQ)AAI32043847
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aYeh, I-Lin.
■24510▼aDirect Laser Acceleration in Ultra-High-Intensity Laser-Plasma Interactions: Higher-Order Resonances, X-Ray Emission, and Radiation Reaction Effects
■260 ▼a[Sl]▼bUniversity of California, San Diego▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a187 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-01, Section: B.
■500 ▼aAdvisor: Arefiev, Alexey.
■5021 ▼aThesis (Ph.D.)--University of California, San Diego, 2025.
■520 ▼aThis dissertation investigates direct laser acceleration (DLA) of electrons in ultra-intense laser-plasma interactions, emphasizing how plasma-generated fields, laser frequency modulation, and radiation friction influence electron dynamics and radiation output. In the DLA regime, a laser propagating through underdense plasma can transfer energy efficiently to electrons, especially when assisted by quasi-static plasma fields. These fields induce betatron oscillations that confine electrons transversely while enabling resonant interactions with the laser field. A key mechanism in DLA is betatron resonance, which occurs when the betatron oscillation frequency matches the average frequency of the laser field experienced by the electron, resulting in net energy gain.The first part of this work uncovers a new DLA regime driven by frequency modulation of the laser field as perceived by the oscillating electron. This modulation enables net energy gain through a third-order resonance-a specific higher-order resonance where the laser completes three oscillations per betatron cycle. In the absence of modulation, energy gain and loss cancel out; with modulation, the oscillation slows near the electron's turning points, allowing net gain. Additionally, the study shows that superluminal laser phase velocities enhance higher-order resonances by introducing a global minimum in the frequency ratio between the laser and betatron oscillations. This effect suppresses detuning and sustains resonance over a broader energy range, providing a more robust pathway for energy transfer in relativistic DLA.The second part of the dissertation shifts focus to x-ray emission and radiation reaction effects. Using particle-in-cell simulations, a backward x-ray emission mechanism is identified in which laser-accelerated electrons are turned around by the plasma field at the density down-ramp and re-collide with the exiting laser pulse, emitting hard x-rays. The resulting backward-directed photon source is more collimated and compact than its forward counterpart, with comparable or higher conversion efficiency. Finally, a test-particle model incorporating radiation friction reveals an attractor effect driven by plasma-induced superluminosity, where electrons converge to similar energy and radiation outputs despite varying initial conditions. These findings provide new insight into the interplay between laser dynamics, plasma fields, and radiation processes-advancing the design of compact, high-brightness electron and photon sources for future high-intensity laser facilities.
■590 ▼aSchool code: 0033.
■650 4▼aPhysics
■650 4▼aNuclear physics
■650 4▼aApplied physics
■650 4▼aElectromagnetics
■650 4▼aPlasma physics
■653 ▼aHigh power laser
■653 ▼aLaser-plasma interactions
■653 ▼aStrong-field physics
■653 ▼aX-ray source
■653 ▼aBetatron
■690 ▼a0605
■690 ▼a0756
■690 ▼a0215
■690 ▼a0607
■690 ▼a0759
■71020▼aUniversity of California, San Diego▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g87-01B.
■790 ▼a0033
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357885▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
