First results on energy recovery in the Jefferson Lab IR FEL
Abstract
A recirculating, energy-recovery linac is used as a driver accelerator for Jefferson Lab's high average power FEL. CW beam of 5 mA design current is transported from the superconducting RF (SRF) linac to the wiggler for lasing, and then recirculated back to the linac for deceleration and energy recovery. About 75% of the beam power is extracted before the beam is transported to the beam dump. Energy recovery reduces power consumption, RF equipment capital costs, and beam dump shielding requirements. It is arguably essential as FEL technology is scaled to higher average power levels. To date 4 mA of CW beam has been energy recovered successfully. There is no evidence of RF instabilities due to the energy aperture of the transport system, momentum compaction or the phase of the decelerating beam. HOM power from the beam has interfered with the operation of the IR interlock detectors, designed to protect the warm waveguide window from thermal runaway. Installation of copper screens appears to have solved the problem. More detailed studies of the HOM spectra and their correlation to the beam properties are planned.
- Authors:
-
- and others
- Publication Date:
- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Research (ER) (US)
- OSTI Identifier:
- 754381
- Report Number(s):
- DOE/ER/40150-1370; JLAB-ACC-99-12
TRN: US0002198
- DOE Contract Number:
- AC05-84ER40150
- Resource Type:
- Conference
- Resource Relation:
- Conference: Particle Accelerator Conference, 1999, New York, NY (US), 03/29/1999--04/02/1999; Other Information: PBD: 1 Aug 1999
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; 42 ENGINEERING; FREE ELECTRON LASERS; LINEAR ACCELERATORS; ENERGY RECOVERY; DESIGN; ENERGY CONSUMPTION; BEAM CURRENTS; PERFORMANCE; FEL
Citation Formats
Benson, S, Biallas, G, and Bohn, C L. First results on energy recovery in the Jefferson Lab IR FEL. United States: N. p., 1999.
Web.
Benson, S, Biallas, G, & Bohn, C L. First results on energy recovery in the Jefferson Lab IR FEL. United States.
Benson, S, Biallas, G, and Bohn, C L. 1999.
"First results on energy recovery in the Jefferson Lab IR FEL". United States. https://www.osti.gov/servlets/purl/754381.
@article{osti_754381,
title = {First results on energy recovery in the Jefferson Lab IR FEL},
author = {Benson, S and Biallas, G and Bohn, C L},
abstractNote = {A recirculating, energy-recovery linac is used as a driver accelerator for Jefferson Lab's high average power FEL. CW beam of 5 mA design current is transported from the superconducting RF (SRF) linac to the wiggler for lasing, and then recirculated back to the linac for deceleration and energy recovery. About 75% of the beam power is extracted before the beam is transported to the beam dump. Energy recovery reduces power consumption, RF equipment capital costs, and beam dump shielding requirements. It is arguably essential as FEL technology is scaled to higher average power levels. To date 4 mA of CW beam has been energy recovered successfully. There is no evidence of RF instabilities due to the energy aperture of the transport system, momentum compaction or the phase of the decelerating beam. HOM power from the beam has interfered with the operation of the IR interlock detectors, designed to protect the warm waveguide window from thermal runaway. Installation of copper screens appears to have solved the problem. More detailed studies of the HOM spectra and their correlation to the beam properties are planned.},
doi = {},
url = {https://www.osti.gov/biblio/754381},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Aug 01 00:00:00 EDT 1999},
month = {Sun Aug 01 00:00:00 EDT 1999}
}