A wiggler magnet for FEL low voltage operation

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:238633

Al-Shamma`a, A; Stuart, R A; Lucas, J

In low voltage FELs (ie, 200kV), operation is necessarily in the microwave frequency range for wiggler periods of the order of cms., so that a waveguide system is mandatory. Also, because of the relatively low velocity of the electron beam, the wiggle amplitude of the electron beam can be much larger than is normal for highly relativistic FELs. Both these factors mean that the electron trajectory must be carefully controlled to avoid beam collision with the waveguide walls. A wiggler system with half poles at entrance and exit is not an acceptable solution because of the offset is gives rise to the electron trajectory. Consequently, we have designed and constructed a wiggler magnet with exponential entrance and exit tapers for a minimal deflection and displacement of the electron beam. Simulations and experimental measurements showed that an on axis trajectory is easily obtainable.

• Research Organization: Brookhaven National Lab., Upton, NY (United States)
• OSTI ID: 238633
• Report Number(s): BNL--61982-Absts.; CONF-9508156--Absts.; ON: DE96002729
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
43 PARTICLE ACCELERATORS
DESIGN
ELECTRON BEAMS
FREE ELECTRON LASERS
OPERATION
WIGGLER MAGNETS