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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Chang, S.F. Scharer, J.E. |
| Copyright Year | 1989 |
| Description | Author affiliation: Wisconsin Univ., Madison, WI, USA (Chang, S.F.; Scharer, J.E.) |
| Abstract | An FEL amplifier with a helical quadrupole wiggler has been investigated analytically and numerically. A three-dimensional simulation code has been utilized to examine the nonlinear evolution of circular waveguide modes as well as the characteristics of relativistic particle motion, which illustrate a strong focusing effect. The simulation predicts a 0.55-dB/cm gain, 2% efficiency, and 8% bandwidth for the optimum TE/sub 21/ mode at 300 GHz for an untapered wiggler. Mode competition for an overmoded waveguide and a nonlinear wiggler taper for efficiency enhancement have been examined for a linear dipole wiggler in a rectangular guide. It has been found that the maximum TE/sub 01/ mode efficiency is 53% at 280 GHz and that the TM/sub 21/ mode power can be as high as 28% in the constant wiggler level region. The dipole wiggler case has been compared with that from the wiggler-averaged code WFEL. |
| File Size | 118173 |
| File Format | |
| DOI | 10.1109/PLASMA.1989.165998 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1989-01-01 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Circular waveguides Free electron lasers Laser modes Masers Rectangular waveguides |
| Content Type | Text |
| Resource Type | Article |
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