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Title: X-ray free electron laser tuning for variable-gap undulators

Abstract

A tuning method for hard x-ray free electron lasers is presented which combines electron-beam-based alignment (EBBA) with undulator radiation spectrum analysis. This method is conducive to achieving a dispersion-free orbit, finding the undulator field center, and determining the accurate value of the gap distance for the operating undulator K for each undulator segment, and it proves to be highly reliable and robust for free electron laser lasing with variable-gap undulators. The effect of the natural focusing of the undulator on the EBBA is confirmed with measurements and a theoretical analysis. The tilt of an undulator segment subject to ground movement introduces an undulator field change which the electron beam interacts with and can be corrected by K tuning to find a precise compensating gap distance. Lattice matching with a wire-scanner-based Twiss parameter measurement along the undulator line enables the EBBA reference orbit to coincide with the e-beam distribution.

Authors:
 [1];  [2]
  1. Pohang Accelerator Lab, Gyeongbuk (Republic of Korea)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1546739
Grant/Contract Number:  
AC02-76SF00515; 2018R1A6B4023605; 2017R1A2B4007274
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 22; Journal Issue: 6; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Kang, Heung -Sik, and Loos, Henrik. X-ray free electron laser tuning for variable-gap undulators. United States: N. p., 2019. Web. doi:10.1103/physrevaccelbeams.22.060703.
Kang, Heung -Sik, & Loos, Henrik. X-ray free electron laser tuning for variable-gap undulators. United States. doi:10.1103/physrevaccelbeams.22.060703.
Kang, Heung -Sik, and Loos, Henrik. Fri . "X-ray free electron laser tuning for variable-gap undulators". United States. doi:10.1103/physrevaccelbeams.22.060703. https://www.osti.gov/servlets/purl/1546739.
@article{osti_1546739,
title = {X-ray free electron laser tuning for variable-gap undulators},
author = {Kang, Heung -Sik and Loos, Henrik},
abstractNote = {A tuning method for hard x-ray free electron lasers is presented which combines electron-beam-based alignment (EBBA) with undulator radiation spectrum analysis. This method is conducive to achieving a dispersion-free orbit, finding the undulator field center, and determining the accurate value of the gap distance for the operating undulator K for each undulator segment, and it proves to be highly reliable and robust for free electron laser lasing with variable-gap undulators. The effect of the natural focusing of the undulator on the EBBA is confirmed with measurements and a theoretical analysis. The tilt of an undulator segment subject to ground movement introduces an undulator field change which the electron beam interacts with and can be corrected by K tuning to find a precise compensating gap distance. Lattice matching with a wire-scanner-based Twiss parameter measurement along the undulator line enables the EBBA reference orbit to coincide with the e-beam distribution.},
doi = {10.1103/physrevaccelbeams.22.060703},
journal = {Physical Review Accelerators and Beams},
number = 6,
volume = 22,
place = {United States},
year = {2019},
month = {6}
}

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Works referenced in this record:

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