The generation and suppression of synchrotron sidebands

Conference · Thu Jan 01 04:00:00 EST 1987

DOI:https://doi.org/10.1016/0168-9002(88)90215-X· OSTI ID:6088700

Warren, R W; Goldstein, J C

Computer simulations of FEL lasing differ in the degree to which they approximate real experiments. One of the FEL codes used extensively at Los Alamos takes account of the features of each electron micropulse and follows the growth and saturation of the optical micropulse. With no additional adjustments, this code displays the development of sidebands and demonstrates their control when optical filters of various kinds are used. Other codes that do not include a description of the micropulse do not automatically display sidebands but need to have artificial noise of some kind added. This is not unexpected because sidebands are generated by an FEL instability; instabilities, in general, need some kind of initiating disturbance. In this paper we: identify the disturbance that triggers the instability in the pulse code; discuss a practical way to suppress the instability without using filters; compare these results with experiments; and discuss these findings. 22 refs., 9 figs.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6088700
• Report Number(s): LA-UR-87-3035; CONF-8709110-4; ON: DE88000532
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
43 PARTICLE ACCELERATORS
430303 -- Particle Accelerators-- Experimental Facilities & Equipment
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
COMPUTER CODES
EFFICIENCY
ENERGY SPECTRA
FILTERS
FREE ELECTRON LASERS
INSTABILITY
LASERS
NOISE
OPTICAL FILTERS
PULSES
SPECTRA