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Title: Multiple harmonic frequencies resonant cavity design and half-scale prototype measurements for a fast kicker

Abstract

Quarter wavelength resonator (QWR) based deflecting cavities with the capability of supporting multiple odd-harmonic modes have been developed for an ultrafast periodic kicker system in the proposed Jefferson Lab Electron Ion Collider (JLEIC, formerly MEIC). Previous work on the kicking pulse synthesis and the transverse beam dynamics tracking simulations show that a flat-top kicking pulse can be generated with minimal emittance growth during injection and circulation of the cooling electron bunches. This flat-top kicking pulse can be obtained when a DC component and 10 harmonic modes with appropriate amplitude and phase are combined together. To support 10 such harmonic modes, four QWR cavities are used with 5, 3, 1, and 1 modes, respectively. In the multiple-mode cavities, several slightly tapered segments of the inner conductor are introduced to tune the higher order deflecting modes to be harmonic, and stub tuners are used to fine tune each frequency to compensate for potential errors. In this paper, we summarize the electromagnetic design of the five-mode cavity, including the geometry optimization to get high transverse shunt impedance, the frequency tuning and sensitivity analysis, and the single loop coupler design for coupling to all of the harmonic modes. In particular we report on themore » design and fabrication of a half-scale copper prototype of this proof-of-principle five-odd-mode cavity, as well as the rf bench measurements. Lastly, we demonstrate mode superposition in this cavity experimentally, which illustrates the kicking pulse generation concept.« less

Authors:
 [1];  [2];  [2];  [2];  [2]
  1. Chinese Academy of Sciences (CAS), Lanzhou (China); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Univ. of Chinese Academy of Sciences, Beijing (China)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1338078
Alternate Identifier(s):
OSTI ID: 1338180
Report Number(s):
JLAB-ACC-16-2342; DOE/OR/23177-3938
Journal ID: ISSN 2469-9888; PRABCJ; TRN: US1701166
Grant/Contract Number:
AC05-06OR23177
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review Accelerators and Beams (Online)
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams (Online); Journal Volume: 19; Journal Issue: 12; Related Information: Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Huang, Yulu, Wang, Haipeng, Wang, Shaoheng, Guo, Jiquan, and Rimmer, Robert A. Multiple harmonic frequencies resonant cavity design and half-scale prototype measurements for a fast kicker. United States: N. p., 2016. Web. doi:10.1103/PhysRevAccelBeams.19.122001.
Huang, Yulu, Wang, Haipeng, Wang, Shaoheng, Guo, Jiquan, & Rimmer, Robert A. Multiple harmonic frequencies resonant cavity design and half-scale prototype measurements for a fast kicker. United States. doi:10.1103/PhysRevAccelBeams.19.122001.
Huang, Yulu, Wang, Haipeng, Wang, Shaoheng, Guo, Jiquan, and Rimmer, Robert A. Fri . "Multiple harmonic frequencies resonant cavity design and half-scale prototype measurements for a fast kicker". United States. doi:10.1103/PhysRevAccelBeams.19.122001.
@article{osti_1338078,
title = {Multiple harmonic frequencies resonant cavity design and half-scale prototype measurements for a fast kicker},
author = {Huang, Yulu and Wang, Haipeng and Wang, Shaoheng and Guo, Jiquan and Rimmer, Robert A.},
abstractNote = {Quarter wavelength resonator (QWR) based deflecting cavities with the capability of supporting multiple odd-harmonic modes have been developed for an ultrafast periodic kicker system in the proposed Jefferson Lab Electron Ion Collider (JLEIC, formerly MEIC). Previous work on the kicking pulse synthesis and the transverse beam dynamics tracking simulations show that a flat-top kicking pulse can be generated with minimal emittance growth during injection and circulation of the cooling electron bunches. This flat-top kicking pulse can be obtained when a DC component and 10 harmonic modes with appropriate amplitude and phase are combined together. To support 10 such harmonic modes, four QWR cavities are used with 5, 3, 1, and 1 modes, respectively. In the multiple-mode cavities, several slightly tapered segments of the inner conductor are introduced to tune the higher order deflecting modes to be harmonic, and stub tuners are used to fine tune each frequency to compensate for potential errors. In this paper, we summarize the electromagnetic design of the five-mode cavity, including the geometry optimization to get high transverse shunt impedance, the frequency tuning and sensitivity analysis, and the single loop coupler design for coupling to all of the harmonic modes. In particular we report on the design and fabrication of a half-scale copper prototype of this proof-of-principle five-odd-mode cavity, as well as the rf bench measurements. Lastly, we demonstrate mode superposition in this cavity experimentally, which illustrates the kicking pulse generation concept.},
doi = {10.1103/PhysRevAccelBeams.19.122001},
journal = {Physical Review Accelerators and Beams (Online)},
number = 12,
volume = 19,
place = {United States},
year = {Fri Dec 09 00:00:00 EST 2016},
month = {Fri Dec 09 00:00:00 EST 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevAccelBeams.19.122001

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