Effect of beam prebunching on gain and efficiency in a free electron laser: Nonlocal theory

被引：4
作者：
Bhasina, Anuradha
Sharma, Suresh C.
机构：
[1] Maharaja Agrasen Inst Technol, Dept Phys, Delhi 110085, India
[2] Guru Premsukh Mem Coll Engn, Dept Elect & Commun, Delhi 110036, India
来源：
PHYSICS OF PLASMAS | 2007年 / 14卷 / 07期
关键词：
D O I：
10.1063/1.2751602
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
Beam prebunching on the free electron laser (FEL) offers considerable enhancement in growth rate, efficiency, and gain when the prebunched beam electrons are in the retarding zone and the electron beam is highly modulated implying the largest beam oscillatory velocity due to wiggler. A nonlocal theory of this process has been developed. The growth rate, efficiency, and gain were evaluated based on existing experimental parameters and compared with available theoretical/experimental results. Nonlocal effects reduce the linear growth rate of the FEL instability. The growth rate, efficiency, and gain of the FEL instability increase with the modulation index and has the largest value when the modulation index approaching unity in addition to the frequency and wave number of the prebunched beam are comparable to that of the radiation wave. The growth rate of the FEL instability scales as one-third power of the beam current in the Compton regime and one-fourth power in the Raman regime.
引用
收藏
页数：4
相关论文
共 18 条
[1]   Super-radiance in a prebunched beam free electron maser [J].
Arbel, M ;
Eichenbaum, AL ;
Pinhasi, Y ;
Lurie, Y ;
Tecimer, M ;
Abramovich, A ;
Kleinman, H ;
Yakover, IM ;
Gover, A .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2000, 445 (1-3) :247-252
[2]   Effect of beam premodulation on gain and efficiency in a free electron laser [J].
Beniwal, V ;
Sharma, SC ;
Sharma, MK .
PHYSICS OF PLASMAS, 2004, 11 (12) :5716-5722
[3]   OPERATION OF A COMPACT FREE-ELECTRON LASER IN THE MILLIMETER-WAVE REGION WITH A BUNCHED ELECTRON-BEAM [J].
CIOCCI, F ;
BARTOLINI, R ;
DORIA, A ;
GALLERANO, GP ;
GIOVENALE, E ;
KIMMITT, MF ;
MESSINA, G ;
RENIERI, A .
PHYSICAL REVIEW LETTERS, 1993, 70 (07) :928-931
[4]   FREE-ELECTRON MASER EXPERIMENT WITH A PREBUNCHED BEAM [J].
COHEN, M ;
KUGEL, A ;
CHAIRMAN, D ;
ARBEL, M ;
KLEINMAN, H ;
BENHAIM, D ;
EICHENBAUM, A ;
DRAZNIN, M ;
PINHASI, Y ;
YAKOVER, I .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1995, 358 (1-3) :82-85
[5]   MASING AND SINGLE-MODE LOCKING IN A FREE-ELECTRON MASER EMPLOYING PREBUNCHED ELECTRON-BEAM [J].
COHEN, M ;
EICHENBAUM, A ;
ARBEL, M ;
BENHAIM, D ;
KLEINMAN, H ;
DRAZNIN, M ;
KUGEL, A ;
YACOVER, IM ;
GOVER, A .
PHYSICAL REVIEW LETTERS, 1995, 74 (19) :3812-3815
[6]   Simulation of prebunching in free-electron lasers [J].
Freund, HP ;
O'Shea, PG ;
Neumann, J .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2003, 507 (1-2) :400-403
[7]   Analysis of the beam bunching produced by a free electron laser [J].
Gardelle, J ;
Labrouche, J ;
Marchese, G ;
Rullier, JL ;
Villate, D ;
Dononhue, JT .
PHYSICS OF PLASMAS, 1996, 3 (11) :4197-4206
[8]   Effects of bunch density gradient in high-gain free-electron lasers [J].
Huang, ZR ;
Kim, KJ .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2000, 445 (1-3) :105-109
[9]   Power, bistability and post-saturation optimization in a pre-bunched free electron laser [J].
Krongauz, MV ;
Pinhasi, Y ;
Tecimer, M ;
Gover, A .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2000, 445 (1-3) :28-33
[10]  
LIU CS, 1994, INTERACTION ELECTROM, P81
12