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Title: First operation of an FEL in same-cell energy recovery mode

Abstract

The driver for Jefferson Lab's kW-level infrared free-electron laser (FEL) is a superconducting, recirculating accelerator that recovers 75% of the electron-beam power and converts it to radio frequency power. As reported in FEL'98, the accelerator operated ''straight-ahead'' to deliver 38 MeV, 1.1 mA cw current for lasing at wavelengths in the vicinity of 5 microns. The waste beam was sent directly to a dump, bypassing the recirculation loop. Stable operation at up to 311 W cw was achieved in this mode. The machine has now recirculated cw average current up to 4.6 mA and has lased cw with energy recovery up to 1,720 W output at 3.1 microns. This is the first FEL to ever operate in the ''same-cell'' energy recovery mode. Energy recovery offers several advantages (reduced RF power and dramatically reduced radio-nuclide production at the dump) and several challenges will be described. The authors have observed heating effects in the mirrors which will be described. They will also report on the additional performance measurements of the FEL that have been performed and connect those measurements to standard models.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
755240
Report Number(s):
DOE/ER/40150-1428; JLAB-ACT-99-06
TRN: US0002415
DOE Contract Number:  
AC05-84ER40150
Resource Type:
Journal Article
Journal Name:
Nucl Instr Meth
Additional Journal Information:
Journal Volume: B; Other Information: Submitted to Nucl Instr Meth, Volume B, PBD 1 Sep 1999; PBD: 1 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 43 PARTICLE ACCELERATORS; FREE ELECTRON LASERS; LINEAR ACCELERATORS; OPERATION; ENERGY RECOVERY; MILLI AMP BEAM CURRENTS; PERFORMANCE; ENERGY CONVERSION

Citation Formats

G.R. Neil, S. Benson, G. Biallas, C.L. Bohn, D. Douglas, H.F. Dylla, R. Evans, J. Fugitt, J. Gubeli, R. Hill, K. Jordan, G. Krafft, R. Li, L. Merminga, D. Oepts, P. Piot, J. Preble, Michelle D. Shinn, T. Siggins, R. Walker, and B. Yunn. First operation of an FEL in same-cell energy recovery mode. United States: N. p., 1999. Web.
G.R. Neil, S. Benson, G. Biallas, C.L. Bohn, D. Douglas, H.F. Dylla, R. Evans, J. Fugitt, J. Gubeli, R. Hill, K. Jordan, G. Krafft, R. Li, L. Merminga, D. Oepts, P. Piot, J. Preble, Michelle D. Shinn, T. Siggins, R. Walker, & B. Yunn. First operation of an FEL in same-cell energy recovery mode. United States.
G.R. Neil, S. Benson, G. Biallas, C.L. Bohn, D. Douglas, H.F. Dylla, R. Evans, J. Fugitt, J. Gubeli, R. Hill, K. Jordan, G. Krafft, R. Li, L. Merminga, D. Oepts, P. Piot, J. Preble, Michelle D. Shinn, T. Siggins, R. Walker, and B. Yunn. Wed . "First operation of an FEL in same-cell energy recovery mode". United States. https://www.osti.gov/servlets/purl/755240.
@article{osti_755240,
title = {First operation of an FEL in same-cell energy recovery mode},
author = {G.R. Neil and S. Benson and G. Biallas and C.L. Bohn and D. Douglas and H.F. Dylla and R. Evans and J. Fugitt and J. Gubeli and R. Hill and K. Jordan and G. Krafft and R. Li and L. Merminga and D. Oepts and P. Piot and J. Preble and Michelle D. Shinn and T. Siggins and R. Walker and B. Yunn},
abstractNote = {The driver for Jefferson Lab's kW-level infrared free-electron laser (FEL) is a superconducting, recirculating accelerator that recovers 75% of the electron-beam power and converts it to radio frequency power. As reported in FEL'98, the accelerator operated ''straight-ahead'' to deliver 38 MeV, 1.1 mA cw current for lasing at wavelengths in the vicinity of 5 microns. The waste beam was sent directly to a dump, bypassing the recirculation loop. Stable operation at up to 311 W cw was achieved in this mode. The machine has now recirculated cw average current up to 4.6 mA and has lased cw with energy recovery up to 1,720 W output at 3.1 microns. This is the first FEL to ever operate in the ''same-cell'' energy recovery mode. Energy recovery offers several advantages (reduced RF power and dramatically reduced radio-nuclide production at the dump) and several challenges will be described. The authors have observed heating effects in the mirrors which will be described. They will also report on the additional performance measurements of the FEL that have been performed and connect those measurements to standard models.},
doi = {},
journal = {Nucl Instr Meth},
number = ,
volume = B,
place = {United States},
year = {1999},
month = {9}
}