IR-FEL lasing over kilowatt average power has been demonstrated at JAERI-FEL driven by a superconducting linac. The lasing is distinguished from other FEL oscillators by its high extraction-efficiency, 6%, and unique cavity-length detuning curve. The lasing at JAERI-FEL has the maximum power at the perfect synchronism between the optical pulse and the electron bunch, while usual FEL oscillators require cavity-length shortening to compensate laser lethargy. Numerical analyses show that the lasing observed at JAERI-FEL is a new type of FEL lasing: quasi-stationary superradiance, which gives extraction efficiency higher than the theoretical prediction previously reported. Our analyses also indicate that long stable macro-pulses generated by superconducting linac are indispensable to establish this new type of lasing.
|Number of pages||3|
|Publication status||Published - 2001|
|Event||2001 Particle Accelerator Conference - Chicago, IL, United States|
Duration: 2001 Jun 18 → 2001 Jun 22
|Other||2001 Particle Accelerator Conference|
|Period||01/6/18 → 01/6/22|
ASJC Scopus subject areas