Modulated desynchronism in short pulse free-electron laser oscillators
We present an experimental and theoretical study of the effect of desynchronism modulation on short pulse free-electron laser (FEL) oscillators. We find that the output power and the micropulse length of the FEL beam oscillate periodically at the modulation frequency and that the minimum micropulse...
Saved in:
Published in | Physical review special topics. PRST-AB. Accelerators and beams Vol. 3; no. 9; p. 090701 |
---|---|
Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
College Park
American Physical Society
01.09.2000
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | We present an experimental and theoretical study of the effect of desynchronism modulation on short pulse free-electron laser (FEL) oscillators. We find that the output power and the micropulse length of the FEL beam oscillate periodically at the modulation frequency and that the minimum micropulse length during the cycle can be significantly shorter than that which can be obtained without modulation. For example, when the desynchronism of our FEL is modulated at 40 kHz, the minimum measured micropulse length is 300 fs. Without modulation the minimum is about 700 fs. We show that when the desynchronism is modulated, the FEL can operate for part of the cycle in the normally inaccessible portion of the output power curve where the FEL gain is less than the cavity losses. It is even possible for the FEL to operate periodically in the region of negative desynchronism where gain, as normally defined, does not exist. |
---|---|
ISSN: | 1098-4402 1098-4402 2469-9888 |
DOI: | 10.1103/PhysRevSTAB.3.090701 |