FINITE PULSE EFFECTS IN SELF-AMPLIFIED-SPONTANEOUS-EMISSION
- Authors
- Kim, Kwang-Je; Hahn, Sang June
- Issue Date
- Apr-1995
- Publisher
- ELSEVIER SCIENCE BV
- Citation
- NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, v.358, no.1-3, pp 93 - 95
- Pages
- 3
- Journal Title
- NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
- Volume
- 358
- Number
- 1-3
- Start Page
- 93
- End Page
- 95
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/56967
- DOI
- 10.1016/0168-9002(94)01557-0
- ISSN
- 0168-9002
1872-9576
- Abstract
- We study the effects of the electron density profile on self-amplified-spontaneous-emission (SASE). A general formalism in the linear regime is developed by deriving the coupled Maxwell-Klimontovich equations for an arbitrary density profile including the effects of the energy spread, diffraction, and the betatron oscillation. An explicit solution is obtained for the one-dimensional (1-D) case. The temporal and the spectral intensity profiles of SASE depend linearly on the initial electron correlation function. The correlation function consists of two terms, a term giving rise to the usual spontaneous radiation and its amplification to SASE, and a term representing the coherent bunched beam effect. The latter term has been neglected so far in the treatments of SASE, but it could be significant when there is a variation in the electron density at a length scale comparable to the wavelength. The theory reproduces the well-known results when the electron density is uniform. It also reproduces a recent theory for a finite top-hat density profile and a vanishing energy spread.
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