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Self-amplification of coherent spontaneous emission in a cherenkov free-electron maser

Wiggins, Mark and Jaroszynski, D.A. and McNeil, B.W.J. and Robb, G.R.M. and Aitken, P. and Phelps, A.D.R. and Cross, A.W. and Ronald, K. (2000) Self-amplification of coherent spontaneous emission in a cherenkov free-electron maser. Physical Review Letters, 84 (11). pp. 2393-2396. ISSN 0031-9007

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Abstract

Ultrashort pulses of microwave radiation have been produced in a dielectric-lined Cherenkov free-electron maser (FEM) amplifier. An intense initial seed pulse, due to coherent spontaneous emission (CSE), arises at the leading edge of the electron pulse. There is evidence to show that 3-4 cycle spikes are produced through the amplification of these seed pulses. A strong dependence of the start-up power on the rise time of the electron pulse has been found. The experimental results are verified by a theoretical analysis. Our study shows that amplification in a FEM amplifier is always initiated by CSE arising from the edge of the electron pulse when the rise time is comparable to the electromagnetic wave period.

Item type: Article
ID code: 17503
Notes: Strathprints' policy is to record up to 8 authors per publication, plus any additional authors based at the University of Strathclyde. More authors may be listed on the official publication than appear in the Strathprints' record.
Keywords: self-amplification, coherent, spontaneous, emission, maser, Physics
Subjects: Science > Physics
Department: Faculty of Science > Physics
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 20 Apr 2010 14:56
    Last modified: 15 Aug 2012 12:26
    URI: http://strathprints.strath.ac.uk/id/eprint/17503

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