期刊
LASER PHYSICS LETTERS
卷 19, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1612-202X/ac3eeb
关键词
free electron laser; strophotron; wave packet
资金
- NSP of the Slovak Republic
- Scientific Grant Agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic
- Slovak Academy of Sciences VEGA project [2/0043/20, 1/0535/21]
- Slovak Research and Development Agency [APVV-15-453]
- MVTS SKTW AMAZON
This paper compares the quantum mechanical and classical approaches in free electron lasers and studies the initial distribution of electrons over vibrational levels in relativistic free electron lasers.
The theory of free electron lasers (FELs) is well developed both in quantum mechanical and classical approaches. In strophotron FEL, in classical approach, resonance frequency and the gain are strongly dependent on initial parameters of electron beam. In the quantum mechanical approach considered by Zaretsky and Nersesov (1983 JETP 57 518), there is no such dependence. The correspondence between the quantum mechanical and classical approaches in a relativistic strophotron FEL is discussed. We study the initial distribution of electrons over vibrational levels determined by the expansion coefficients in relativistic strophotron FEL. It is shown, (presenting electron wave function in the form of Gaussian wave packet), that the number of the vibrational level most efficiently populated at the initial moment of time can be expressed in terms of the initial parameters of the electron beam.
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