TY - JOUR
T1 - Efficiency enhancement of a pre-bunched free-electron maser oscillator by locking to a single eigen frequency of the resonator
AU - Abramovich, A.
AU - Pinhasi, Y.
AU - Kleinman, H.
AU - Eichenbaum, A.
AU - Yakover, Y. M.
AU - Gover, A.
N1 - Funding Information:
This work was supported by the Israel National Science Foundation and the Ministry of Science.
PY - 1999/6
Y1 - 1999/6
N2 - We present simulations results and experimental evidence of radiation energy extraction efficiency enhancement by use of pre-bunching in a free electron maser (FEM). This enhancement is attained by locking the oscillator to operate at a distinct resonator eigen frequency (longitudinal mode) which is different from the maximum-gain frequency of the free running oscillator. The mode selection is accomplished by means of pre-bunching at the desired eigen frequency. It was shown that maximum extraction efficiency is obtained if the dominant resonator mode (obtained by pre-bunching at that frequency) is the one having the lowest eigen frequency under the net gain larger than unity curve (which is below the maximum gain eigen-frequency mode that would normally dominate in a free running oscillator). The numerical simulations predict that it should be possible to obtain a basic extraction efficiency enhancement of the oscillator of 50%. Experimental results so far have shown an improvement of about 30%.
AB - We present simulations results and experimental evidence of radiation energy extraction efficiency enhancement by use of pre-bunching in a free electron maser (FEM). This enhancement is attained by locking the oscillator to operate at a distinct resonator eigen frequency (longitudinal mode) which is different from the maximum-gain frequency of the free running oscillator. The mode selection is accomplished by means of pre-bunching at the desired eigen frequency. It was shown that maximum extraction efficiency is obtained if the dominant resonator mode (obtained by pre-bunching at that frequency) is the one having the lowest eigen frequency under the net gain larger than unity curve (which is below the maximum gain eigen-frequency mode that would normally dominate in a free running oscillator). The numerical simulations predict that it should be possible to obtain a basic extraction efficiency enhancement of the oscillator of 50%. Experimental results so far have shown an improvement of about 30%.
UR - http://www.scopus.com/inward/record.url?scp=0032641822&partnerID=8YFLogxK
U2 - 10.1016/S0168-9002(99)00081-9
DO - 10.1016/S0168-9002(99)00081-9
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AN - SCOPUS:0032641822
SN - 0168-9002
VL - 429
SP - 107
EP - 110
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 1
T2 - Proceedings of the 1998 20th International Free Electron Laser Conference and 5th FEL User Workshop
Y2 - 16 August 1998 through 21 August 1998
ER -