서지주요정보
체렌코프 메이저에 대한 입자 모사 실험 = Partical simulation for the cherenkov maser
서명 / 저자 체렌코프 메이저에 대한 입자 모사 실험 = Partical simulation for the cherenkov maser / 홍병희.
저자명 홍병희 ; Hong, Byoung-Hee
발행사항 [대전 : 한국과학기술원, 1995].
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소장정보

등록번호

8005236

소장위치/청구기호

학술문화관(문화관) 보존서고

DPH 95007

SMS전송

도서상태

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반납예정일

초록정보

For the case of a strongly magnetized plasam where the beam may be treated as one dimensional, the most unstable transverse magnetic (TM) mode is dominantly interacting with the relativistic electron beam and grows until it saturates in the final steady state. The nonlinear phenomena in the dielectric-lined Cherenkov masers are investigated via particle simulation and nonlinear analysis. Both studies are proceeded independently; the one is kinetic approach and the other is fluid approach. Both results supplement each other and well explain the experimental result. In the particle simulation finite difference method (FDM), particle-in-cell (PIC) method and leap-frog methods are used. Poisson equation is solved using Fourier analysis cyclic reduction (FACR) method. The phase diagrams of the beam electrons indicate that the saturation of the electromagnetic (EM) wave comes from the trapping of the electrons in the EM wave potential. From the result of the particle simulation we can know the efficiency, the saturation length and time, and the output power. However, it is a very hard and time consuming work to follow fully the trajectries of the electrons from the linear stage to the final saturation state. Hence, we find out the coupled nonlinear equation sets, which express the saturation state, using the cold fluid-Maxwell equations. From this nonlear analysis the efficiency of the most unstable wave as well as the real frequency shift is investigated. The effects of the beam current, the beam energy, the beam position, and the dielectric materials on the efficiency are discussed. The fraction of the electrons, which are deeply trapped in the electromagnetic wave and contribute to its amplification, is expressed as $(\gamma/\gamma_{60})^q$ with q = 1.8. The saturation frequency is up-shifted from the frequency with the largest linear growth rate. The present study suggests that the frequency-upshifts are from the nonlinear parametric coupling of the transverse magnetic waveguide mode and the space-charge wave. This may explain the recent experimental results where the observed upshifts were attributed to the dielectric liner charging [F. Garate, R. Cook, P. Heim, R. Layman, and J. Walsh J. Appl. Phys. 58, 627 (1985)].

서지기타정보

서지기타정보
청구기호 {DPH 95007
형태사항 iii, 102 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Byoung-Hee Hong
지도교수의 한글표기 : 최덕인
지도교수의 영문표기 : Duk-In Choi
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 53-57
주제 메이저. --과학기술용어시소러스
시뮬레이션. --과학기술용어시소러스
Cherenkov radiation.
Lasers.
Computer simulation.
Cherenkov 방사. --과학기술용어시소러스
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