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Title: Magnet system optimization for segmented adaptive-gap in-vacuum undulator

Abstract

Segmented Adaptive Gap in-vacuum Undulator (SAGU), in which different segments have different gaps and periods, promises a considerable spectral performance gain over a conventional undulator with uniform gap and period. According to calculations, this gain can be comparable to the gain achievable with a superior undulator technology (e.g. a room-temperature in-vacuum hybrid SAGU would perform as a cryo-cooled hybrid in-vacuum undulator with uniform gap and period). However, for reaching the high spectral performance, SAGU magnetic design has to include compensation of kicks experienced by the electron beam at segment junctions because of different deflection parameter values in the segments. We show that such compensation to large extent can be accomplished by using a passive correction, however, simple correction coils are nevertheless required as well to reach perfect compensation over a whole SAGU tuning range. Magnetic optimizations performed with Radia code, and the resulting undulator radiation spectra calculated using SRW code, demonstrating a possibility of nearly perfect correction, are presented.

Authors:
; ;  [1]
  1. Energy Sciences Directorates, Brookhaven National Laboratory, Upton NY1 1973 (United States)
Publication Date:
OSTI Identifier:
22608313
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1741; Journal Issue: 1; Conference: SRI2015: 12. international conference on synchrotron radiation instrumentation, New York, NY (United States), 6-10 Jul 2015; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; COMPARATIVE EVALUATIONS; CONNECTORS; CORRECTIONS; ELECTRON BEAMS; GAIN; PERFORMANCE; SPECTRA; SUPERCONDUCTING JUNCTIONS; TEMPERATURE RANGE 0273-0400 K; WIGGLER MAGNETS

Citation Formats

Kitegi, C., E-mail: ckitegi@bnl.gov, Chubar, O., and Eng, C.. Magnet system optimization for segmented adaptive-gap in-vacuum undulator. United States: N. p., 2016. Web. doi:10.1063/1.4952797.
Kitegi, C., E-mail: ckitegi@bnl.gov, Chubar, O., & Eng, C.. Magnet system optimization for segmented adaptive-gap in-vacuum undulator. United States. doi:10.1063/1.4952797.
Kitegi, C., E-mail: ckitegi@bnl.gov, Chubar, O., and Eng, C.. 2016. "Magnet system optimization for segmented adaptive-gap in-vacuum undulator". United States. doi:10.1063/1.4952797.
@article{osti_22608313,
title = {Magnet system optimization for segmented adaptive-gap in-vacuum undulator},
author = {Kitegi, C., E-mail: ckitegi@bnl.gov and Chubar, O. and Eng, C.},
abstractNote = {Segmented Adaptive Gap in-vacuum Undulator (SAGU), in which different segments have different gaps and periods, promises a considerable spectral performance gain over a conventional undulator with uniform gap and period. According to calculations, this gain can be comparable to the gain achievable with a superior undulator technology (e.g. a room-temperature in-vacuum hybrid SAGU would perform as a cryo-cooled hybrid in-vacuum undulator with uniform gap and period). However, for reaching the high spectral performance, SAGU magnetic design has to include compensation of kicks experienced by the electron beam at segment junctions because of different deflection parameter values in the segments. We show that such compensation to large extent can be accomplished by using a passive correction, however, simple correction coils are nevertheless required as well to reach perfect compensation over a whole SAGU tuning range. Magnetic optimizations performed with Radia code, and the resulting undulator radiation spectra calculated using SRW code, demonstrating a possibility of nearly perfect correction, are presented.},
doi = {10.1063/1.4952797},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1741,
place = {United States},
year = 2016,
month = 7
}