Simulations of the 100 kW TJNAF FEL Using a Step-Tapered Undulator
The TJNAF free electron laser (FEL) can be upgraded to operate at 100 kW average power in the near future using a configuration that recirculates the electron beam to recover energy. It is important to extract the maximum energy from the electron beam in a pass through the undulator while inducing the minimum amount of exhaust energy spread. A larger energy extraction reduces the requirement for a large recirculating current, while a smaller exhaust energy spread allows the intense electron beam to be recirculated without damaging components. To improve FEL performance, we explore the use of the step-tapered undulator which alters the resonance condition halfway through the undulator. Short pulses and optical diffraction complicate the desired interaction. Comparisons are made to the conventional periodic and linearly tapered undulators.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 794941
- Report Number(s):
- JLAB-ACT-01-26; DOE/ER/40150-2077; TRN: US0201163
- Journal Information:
- Nuclear Instruments and Methods in Physics Research A, Vol. 483 (1-2) (2002) pp. 138-141, Other Information: presented at 23rd Intl FEL Conf. and 8th FEL Users Workshop,8/2001, Germany; PBD: 1 May 2002
- Country of Publication:
- United States
- Language:
- English
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