Low-gain free-electron laser near cyclotron resonance
Journal Article
·
· Phys. Rev. A; (United States)
The Einstein-coefficient method is used to calculate the growth rate of a low-gain free-electron laser for a tenuous relativistic electron beam propagating in the combined axial and transverse helical wiggler fields B/sub 0/e/sub z/ -(deltaB cosk/sub 0/ze/sub x/ +deltaB sink/sub 0/ze/sub y/). The analysis assumes that the system is close to resonance between the electron-cyclotron frequency in the guide field (..omega../sub c/ = eB/sub 0//..gamma..mc) and the wiggler frequency in the beam frame (..omega../sub 0/ = k/sub 0/V/sub b/). It is shown that the gain near resonance can be substantially enhanced relative to the gain obtained in the region far from resonance.
- Research Organization:
- Plasma Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
- OSTI ID:
- 5062001
- Journal Information:
- Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 25:6; ISSN PLRAA
- Country of Publication:
- United States
- Language:
- English
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