Efficiency enhancement of a harmonic lasing free-electron laser

被引：1

作者：

Salehi, E. ^{[1
]}

Maraghechi, B. ^{[1
]}

Mirian, N. S. ^{[2
]}

机构：

[1] Amirkabir Univ Technol, Dept Phys, Tehran 158754413, Iran

[2] Inst Res Fundamental Sci IPM, Sch Particle & Accelerator Phys, Tehran 193955531, Iran

来源：

PHYSICS OF PLASMAS | 2015年 / 22卷 / 03期

关键词：

GENERATION; RADIATION;

D O I：

10.1063/1.4908280

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：

The harmonic lasing free-electron laser amplifier, in which two wigglers is employed in order for the fundamental resonance of the second wiggler to coincide with the third harmonic of the first wiggler to generate ultraviolet radiation, is studied. A set of coupled nonlinear first-order differential equations describing the nonlinear evolution of the system, for a long electron bunch, is solved numerically by CYRUS code. Solutions for the non-averaged and averaged equations are compared. Remarkable agreement is found between the averaged and non-averaged simulations for the evolution of the third harmonic. Thermal effects in the form of longitudinal velocity spread are also investigated. For efficiency enhancement, the second wiggler field is set to decrease linearly and nonlinearly at the point where the radiation of the third harmonic saturates. The optimum starting point and the slope of the tapering of the amplitude of the wiggler are found by a successive run of the code. It is found that tapering can increase the saturated power of the third harmonic considerably. In order to reduce the length of the wiggler, the prebunched electron beam is considered. (C) 2015 AIP Publishing LLC.

引用

页数：9

共 44 条

[1] Operation of a free-electron laser from the extreme ultraviolet to the water window [J].

Ackermann, W. ;

Asova, G. ;

Ayvazyan, V. ;

Azima, A. ;

Baboi, N. ;

Baehr, J. ;

Balandin, V. ;

Beutner, B. ;

Brandt, A. ;

Bolzmann, A. ;

Brinkmann, R. ;

Brovko, O. I. ;

Castellano, M. ;

Castro, P. ;

Catani, L. ;

Chiadroni, E. ;

Choroba, S. ;

Cianchi, A. ;

Costello, J. T. ;

Cubaynes, D. ;

Dardis, J. ;

Decking, W. ;

Delsim-Hashemi, H. ;

Delserieys, A. ;

Di Pirro, G. ;

Dohlus, M. ;

Duesterer, S. ;

Eckhardt, A. ;

Edwards, H. T. ;

Faatz, B. ;

Feldhaus, J. ;

Floettmann, K. ;

Frisch, J. ;

Froehlich, L. ;

Garvey, T. ;

Gensch, U. ;

Gerth, Ch. ;

Goerler, M. ;

Golubeva, N. ;

Grabosch, H.-J. ;

Grecki, M. ;

Grimm, O. ;

Hacker, K. ;

Hahn, U. ;

Han, J. H. ;

Honkavaara, K. ;

Hott, T. ;

Huening, M. ;

Ivanisenko, Y. ;

Jaeschke, E. .

NATURE PHOTONICS, 2007, 1 (06) :336-342

[2]

Bhain A., 2007, PHYS PLASMAS, V14

[3] LARGE HARMONIC BUNCHING IN A HIGH-GAIN FREE-ELECTRON LASER [J].

BONIFACIO, R ;

DESALVO, L ;

PIERINI, P .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1990, 293 (03) :627-629

[4] COLLECTIVE INSTABILITIES AND HIGH-GAIN REGIME IN A FREE-ELECTRON LASER [J].

BONIFACIO, R ;

PELLEGRINI, C ;

NARDUCCI, LM .

OPTICS COMMUNICATIONS, 1984, 50 (06) :373-378

[5] Study of the frequency multiplication process in a multistage HGHG FEL [J].

Brefeld, W ;

Faatz, B ;

Feldhaus, J ;

Körfer, M ;

Krzywinski, J ;

Möller, T ;

Pflueger, J ;

Rossbach, J ;

Saldin, EL ;

Schneidmiller, EA ;

Schreiber, S ;

Yurkov, MV .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2002, 483 (1-2) :80-88

[6] 3-DIMENSIONAL THEORY OF THE SMALL-SIGNAL HIGH-GAIN FREE-ELECTRON LASER INCLUDING BETATRON OSCILLATIONS [J].

CHIN, YH ;

KIM, KJ ;

XIE, M .

PHYSICAL REVIEW A, 1992, 46 (10) :6662-6683

[7] Two Color Free-Electron Laser and Frequency Beating [J].

Ciocci, F. ;

Dattoli, G. ;

Pagnutti, S. ;

Petralia, A. ;

Sabia, E. ;

Ottaviani, P. L. ;

Ferrario, M. ;

Villa, F. ;

Petrillo, V. .

PHYSICAL REVIEW LETTERS, 2013, 111 (26)

[8] Characterization of a high-gain harmonic-generation free-electron laser at saturation [J].

Doyuran, A ;

Babzien, M ;

Shaftan, T ;

Yu, LH ;

DiMauro, LF ;

Ben-Zvi, I ;

Biedron, SG ;

Graves, W ;

Johnson, E ;

Krinsky, S ;

Malone, R ;

Pogorelsky, I ;

Skaritka, J ;

Rakowsky, G ;

Wang, XJ ;

Woodle, M ;

Yakimenko, V ;

Jagger, J ;

Sajaev, V ;

Vasserman, I .

PHYSICAL REVIEW LETTERS, 2001, 86 (26) :5902-5905

[9] The effect of shot noise on the start up of the fundamental and harmonics in free-electron lasers [J].

Freund, H. P. ;

Giannessi, L. ;

Miner, W. H., Jr. .

JOURNAL OF APPLIED PHYSICS, 2008, 104 (12)

[10]

Freund H. P., 2005, P 27 INT FREE EL LAS

← 1 2 3 4 5 →