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Title: An Experimental Study of an FEL Oscillator with a Linear Taper

Abstract

Motivated by the work of Saldin, Schneidmiller and Yurkov, we have measured the detuning curve widths, spectral characteristics, efficiency, and energy spread as a function of the taper for low and high Q resonators in the IR Demo FEL at Jefferson Lab. Both positive and negative tapers were used. Gain and frequency agreed reasonably well with the predictions of a single mode theory. The efficiency agreed reasonably well for a negative taper with a high Q resonator but disagreed for lower Q values due to the large slippage parameter and the non-ideal resonator Q. We saw better efficiency for a negative taper than for the same positive taper. The energy spread induced in the beam, normalized to the efficiency is larger for the positive taper than for the corresponding negative taper. This indicates that a negative taper is preferred over a positive taper in an energy recovery FEL.

Authors:
; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US) (US)
OSTI Identifier:
773366
Report Number(s):
JLAB-ACC-01-01; DOE/ER/40150-1798
TRN: US0200916
DOE Contract Number:  
AC05-84ER40150
Resource Type:
Journal Article
Resource Relation:
Journal Name: Submitted to Nuclear Instruments and Methods in Physics Research Section A, Volume 475 (1-3); Journal Volume: 475 (1-3); Other Information: Submitted to Nucl Inst and Meth A; PBD: 1 Jan 2001; PBD: 1 Jan 2001
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; EFFICIENCY; ENERGY RECOVERY; OSCILLATORS; RESONATORS

Citation Formats

Benson, S, Gubeli, J, and Neil, G R. An Experimental Study of an FEL Oscillator with a Linear Taper. United States: N. p., 2001. Web. doi:10.1016/S0168-9002(01)01620-5.
Benson, S, Gubeli, J, & Neil, G R. An Experimental Study of an FEL Oscillator with a Linear Taper. United States. doi:10.1016/S0168-9002(01)01620-5.
Benson, S, Gubeli, J, and Neil, G R. Mon . "An Experimental Study of an FEL Oscillator with a Linear Taper". United States. doi:10.1016/S0168-9002(01)01620-5. https://www.osti.gov/servlets/purl/773366.
@article{osti_773366,
title = {An Experimental Study of an FEL Oscillator with a Linear Taper},
author = {Benson, S and Gubeli, J and Neil, G R},
abstractNote = {Motivated by the work of Saldin, Schneidmiller and Yurkov, we have measured the detuning curve widths, spectral characteristics, efficiency, and energy spread as a function of the taper for low and high Q resonators in the IR Demo FEL at Jefferson Lab. Both positive and negative tapers were used. Gain and frequency agreed reasonably well with the predictions of a single mode theory. The efficiency agreed reasonably well for a negative taper with a high Q resonator but disagreed for lower Q values due to the large slippage parameter and the non-ideal resonator Q. We saw better efficiency for a negative taper than for the same positive taper. The energy spread induced in the beam, normalized to the efficiency is larger for the positive taper than for the corresponding negative taper. This indicates that a negative taper is preferred over a positive taper in an energy recovery FEL.},
doi = {10.1016/S0168-9002(01)01620-5},
journal = {Submitted to Nuclear Instruments and Methods in Physics Research Section A, Volume 475 (1-3)},
number = ,
volume = 475 (1-3),
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2001},
month = {Mon Jan 01 00:00:00 EST 2001}
}