Title :
Energy stability in a high average power FEL
Author :
Merminga, L. ; Bisognano, J.J.
Author_Institution :
CEBAF, Newport News, VA, USA
Abstract :
Recirculating, energy-recovering linacs can be used as driver accelerators for high power FELs. Instabilities which arise from fluctuations of the cavity fields are investigated. Energy changes can cause beam loss on apertures, or, when coupled to M56 phase oscillations. Both effects change the beam induced voltage in the cavities and can lead to unstable variations of the accelerating field. Stability analysis for small perturbations from equilibrium is performed and threshold currents are determined. Design strategies to increase the instability threshold are discussed and the high average power FEL proposed for construction at CEBAF is used as an example
Keywords :
electron accelerators; free electron lasers; particle beam stability; CEBAF; M56 phase oscillations; accelerating field; beam induced voltage; cavity fields; high average power FEL; instability threshold; recirculating energy-recovering linacs; threshold currents; Acceleration; Apertures; Fluctuations; Linear accelerators; Optical coupling; Particle beams; Stability analysis; Structural beams; Threshold current; Voltage;
Conference_Titel :
Particle Accelerator Conference, 1995., Proceedings of the 1995
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-2934-1
DOI :
10.1109/PAC.1995.505661
