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Title: Field correction in three dimensions for a one-meter long permanent magnet wiggler

Abstract

This paper discusses the correction technique used on the recently assembled 1-meter long, 2.05-cm period, 4 mm-gap permanent magnet wiggler. The taut-wire technique was used to measure and correct the magnetic field to first order in three dimensions. The wire was moved transversely in the x-y plane to examine two dimensions, with distance along the wire (or time during he signal) providing the z dimension. The peak K value for this wiggler is 1.23 corresponding to a peak wiggle amplitude of 50 microns for a 40 MeV beam. The electron beam radius in the wiggler is 200--400 microns whereas the optical beam radius is 600--700 microns for 3 micron light. To obtain good overlap between the electron beam and optical beam we aim to have the average trajectory of an electron deviate from its initial position a distance less than a peak wiggle displacement. This criteria is perhaps overly conservative at 3 micron operation but at shorter wavelengths typical of higher harmonic operation better magnetic field quality is needed.

Authors:
Publication Date:
Research Org.:
Los Alamos National Lab., NM (United States)
Sponsoring Org.:
Department of Defense, Washington, DC (United States)
OSTI Identifier:
10175239
Report Number(s):
LA-UR-92-2678; CONF-9208109-7
ON: DE92040247
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: 16. international LINAC conference,Ottawa (Canada),23-28 Aug 1992; Other Information: PBD: [1992]
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; WIGGLER MAGNETS; MAGNETIC FIELDS; CORRECTIONS; MEASURING METHODS; SERIES EXPANSION; FREE ELECTRON LASERS; ERRORS; THREE-DIMENSIONAL CALCULATIONS; LINEAR ACCELERATORS; 430303; 430200; EXPERIMENTAL FACILITIES AND EQUIPMENT; BEAM DYNAMICS, FIELD CALCULATIONS, AND ION OPTICS

Citation Formats

Fortgang, C M. Field correction in three dimensions for a one-meter long permanent magnet wiggler. United States: N. p., 1992. Web.
Fortgang, C M. Field correction in three dimensions for a one-meter long permanent magnet wiggler. United States.
Fortgang, C M. 1992. "Field correction in three dimensions for a one-meter long permanent magnet wiggler". United States.
@article{osti_10175239,
title = {Field correction in three dimensions for a one-meter long permanent magnet wiggler},
author = {Fortgang, C M},
abstractNote = {This paper discusses the correction technique used on the recently assembled 1-meter long, 2.05-cm period, 4 mm-gap permanent magnet wiggler. The taut-wire technique was used to measure and correct the magnetic field to first order in three dimensions. The wire was moved transversely in the x-y plane to examine two dimensions, with distance along the wire (or time during he signal) providing the z dimension. The peak K value for this wiggler is 1.23 corresponding to a peak wiggle amplitude of 50 microns for a 40 MeV beam. The electron beam radius in the wiggler is 200--400 microns whereas the optical beam radius is 600--700 microns for 3 micron light. To obtain good overlap between the electron beam and optical beam we aim to have the average trajectory of an electron deviate from its initial position a distance less than a peak wiggle displacement. This criteria is perhaps overly conservative at 3 micron operation but at shorter wavelengths typical of higher harmonic operation better magnetic field quality is needed.},
doi = {},
url = {https://www.osti.gov/biblio/10175239}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {9}
}

Conference:
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