Abstract
We have conducted experiments to measure the gain of a free electron laser (FEL) with an optical klystron (OK) on the UVSOR storage ring. A conventional undulator has been remodeled into the OK in order to increase the gain. The FEL gain at a wavelength of 488 nm has been measured as a function of Nd, which is the number of wavelengths of light passing over an electron in a dispersive section of the OK. The measured gain curve is in good agreement with that calculated according to Madey’s theorem from a measured spectrum of spontaneous radiation. The measured instantaneous peak gain is 0.4% for an average beam current of 10 mA/bunch, which agrees well with the gain calculated theoretically. The gain with the OK is enhanced by a factor of five compared with that with the conventional undulator.
| Original language | English |
|---|---|
| Pages (from-to) | 1285-1289 |
| Number of pages | 5 |
| Journal | Japanese Journal of Applied Physics |
| Volume | 32 |
| Issue number | 3 R |
| DOIs | |
| Publication status | Published - 1993 Mar |
Keywords
- Electron storage ring
- Free electron laser
- Gain measurement
- Optical klystron
- Synchrotron radiation