skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Multi-order lasing with a modified wiggler

Abstract

A novel wiggler for multi-order harmonic lasing has been developed at ILT/ILE. This wiggler, called modified wiggler, produces a composite magnetic field that is expanded as a sum of harmonics of a fundamental field component: B(z) = B{sub 1} sin(k{sub 1}z) + B{sub 3} sin(3k{sub 1}z) + B{sub 5} sin(5k{sub 1}z) +{hor_ellipsis}, where k{sub 1} is the wavenumber of the fundamental field component and B{sub n} is the magnetic flux of nth order field component. Analytical work predicted the improvement of the gain on FEL harmonics with the modified wiggler. This effect on the gain is remarkable for the higher order harmonics, so that fifth or higher order harmonic lasing will be possible. We constructed a modified wiggler by arranging high-permeability shims inside the gap of a conventional wiggler of 20 mm period. This modified wiggler has a ratio of the third-harmonic flux to the fundamental, B{sub 3}/B{sub 1}, of 10 %, which is enough to increase the gain on the FEL harmonics. The harmonic lasing experiment is now under way using a 9 MeV S-band photo-injector at ILT/ILE. Then the wavelength is 15 {mu}m at third-harmonic and 10 {mu}m at fifth-harmonic. The gain on the third-harmonic is calculated tomore » be 27%, which is 1.5 times greater than that of non-modified wiggler. The fifth-harmonic lasing is seeded by a CO{sub 2} laser. We will discuss about the gain enhancement as a function of modification ratio.« less

Authors:
; ;  [1]
  1. Institute of Laser Technology, Osaka (Japan); and others
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
OSTI Identifier:
238786
Report Number(s):
BNL-61982-Absts.; CONF-9508156-Absts.
Journal ID: ISSN 0168-9002; ON: DE96002729; TRN: 96:013275
Resource Type:
Conference
Resource Relation:
Journal Volume: 375; Journal Issue: 1-3; Conference: 17. international free electron laser conference, New York, NY (United States), 21-25 Aug 1995; Other Information: PBD: [1995]; Related Information: Is Part Of 17th international free electron laser conference and 2nd international FEL users` workshop. Program and abstracts; PB: 300 p.
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; WIGGLER MAGNETS; HARMONICS; FREE ELECTRON LASERS; MAGNETIC FIELDS; GAIN

Citation Formats

Asakawa, M, Fujita, M, and Chen, J. Multi-order lasing with a modified wiggler. United States: N. p., 1995. Web. doi:10.1016/0168-9002(95)01383-0.
Asakawa, M, Fujita, M, & Chen, J. Multi-order lasing with a modified wiggler. United States. https://doi.org/10.1016/0168-9002(95)01383-0
Asakawa, M, Fujita, M, and Chen, J. 1995. "Multi-order lasing with a modified wiggler". United States. https://doi.org/10.1016/0168-9002(95)01383-0. https://www.osti.gov/servlets/purl/238786.
@article{osti_238786,
title = {Multi-order lasing with a modified wiggler},
author = {Asakawa, M and Fujita, M and Chen, J},
abstractNote = {A novel wiggler for multi-order harmonic lasing has been developed at ILT/ILE. This wiggler, called modified wiggler, produces a composite magnetic field that is expanded as a sum of harmonics of a fundamental field component: B(z) = B{sub 1} sin(k{sub 1}z) + B{sub 3} sin(3k{sub 1}z) + B{sub 5} sin(5k{sub 1}z) +{hor_ellipsis}, where k{sub 1} is the wavenumber of the fundamental field component and B{sub n} is the magnetic flux of nth order field component. Analytical work predicted the improvement of the gain on FEL harmonics with the modified wiggler. This effect on the gain is remarkable for the higher order harmonics, so that fifth or higher order harmonic lasing will be possible. We constructed a modified wiggler by arranging high-permeability shims inside the gap of a conventional wiggler of 20 mm period. This modified wiggler has a ratio of the third-harmonic flux to the fundamental, B{sub 3}/B{sub 1}, of 10 %, which is enough to increase the gain on the FEL harmonics. The harmonic lasing experiment is now under way using a 9 MeV S-band photo-injector at ILT/ILE. Then the wavelength is 15 {mu}m at third-harmonic and 10 {mu}m at fifth-harmonic. The gain on the third-harmonic is calculated to be 27%, which is 1.5 times greater than that of non-modified wiggler. The fifth-harmonic lasing is seeded by a CO{sub 2} laser. We will discuss about the gain enhancement as a function of modification ratio.},
doi = {10.1016/0168-9002(95)01383-0},
url = {https://www.osti.gov/biblio/238786}, journal = {},
issn = {0168-9002},
number = 1-3,
volume = 375,
place = {United States},
year = {1995},
month = {12}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: