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Title: Multienergy operation analysis in a superconducting linac based on off-frequency detune method

Abstract

The free-electron laser facilities driven by a superconducting radio-frequency (SRF) linac provide high-repetition-rate electron beam, which makes it feasible to feed multiple undulator lines at the same time. In this paper, we study a method of controlling the energy of multiple electron bunches by off-frequency detuning in the SRF linac. Based on the theoretical analysis, we present the available discrete frequency detunes and the optimal linac energy allocation solutions with given energy overhead and periodic energy pattern. The required off-frequency detune is not larger than half of the beam repetition rate, which can be realized with the frequency tuner in SRF cavities. Here, we adopt the configuration of the high energy upgrade of the Linac Coherent Light Source II (LCLS-II-HE) as an example to discuss the possible schemes in practice to support two undulator lines simultaneously. We also discuss the energy jitter increase due to the off-crest acceleration, the tunable energy range with fixed total SRF linac energy capacity, the beam energy chirp and lattice design for multienergy beam transport.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1];  [1]
  1. 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 Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1573118
Alternate Identifier(s):
OSTI ID: 1573031
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 22; Journal Issue: 11; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; multienergy operation; superconducting linac; frequency detune

Citation Formats

Zhang, Zhen, Ding, Yuantao, Adolphsen, Chris, and Raubenheimer, Tor. Multienergy operation analysis in a superconducting linac based on off-frequency detune method. United States: N. p., 2019. Web. doi:10.1103/PhysRevAccelBeams.22.110702.
Zhang, Zhen, Ding, Yuantao, Adolphsen, Chris, & Raubenheimer, Tor. Multienergy operation analysis in a superconducting linac based on off-frequency detune method. United States. doi:10.1103/PhysRevAccelBeams.22.110702.
Zhang, Zhen, Ding, Yuantao, Adolphsen, Chris, and Raubenheimer, Tor. Tue . "Multienergy operation analysis in a superconducting linac based on off-frequency detune method". United States. doi:10.1103/PhysRevAccelBeams.22.110702.
@article{osti_1573118,
title = {Multienergy operation analysis in a superconducting linac based on off-frequency detune method},
author = {Zhang, Zhen and Ding, Yuantao and Adolphsen, Chris and Raubenheimer, Tor},
abstractNote = {The free-electron laser facilities driven by a superconducting radio-frequency (SRF) linac provide high-repetition-rate electron beam, which makes it feasible to feed multiple undulator lines at the same time. In this paper, we study a method of controlling the energy of multiple electron bunches by off-frequency detuning in the SRF linac. Based on the theoretical analysis, we present the available discrete frequency detunes and the optimal linac energy allocation solutions with given energy overhead and periodic energy pattern. The required off-frequency detune is not larger than half of the beam repetition rate, which can be realized with the frequency tuner in SRF cavities. Here, we adopt the configuration of the high energy upgrade of the Linac Coherent Light Source II (LCLS-II-HE) as an example to discuss the possible schemes in practice to support two undulator lines simultaneously. We also discuss the energy jitter increase due to the off-crest acceleration, the tunable energy range with fixed total SRF linac energy capacity, the beam energy chirp and lattice design for multienergy beam transport.},
doi = {10.1103/PhysRevAccelBeams.22.110702},
journal = {Physical Review Accelerators and Beams},
number = 11,
volume = 22,
place = {United States},
year = {2019},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.22.110702

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Works referenced in this record:

Femtosecond X-ray protein nanocrystallography
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