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Title: Ultrafast harmonic rf kicker design and beam dynamics analysis for an energy recovery linac based electron circulator cooler ring

Abstract

An ultrafast kicker system is being developed for the energy recovery linac (ERL) based electron circulator cooler ring (CCR) in the proposed Jefferson Lab Electron Ion Collider (JLEIC, previously named MEIC). In the CCR, the injected electron bunches can be recirculated while performing ion cooling for 10–30 turns before the extraction, thus reducing the recirculation beam current in the ERL to 1/10–1/30 (150mA–50 mA) of the cooling beam current (up to 1.5 A). Assuming a bunch repetition rate of 476.3 MHz and a recirculating factor of 10 in the CCR, the kicker is required to operate at a pulse repetition rate of 47.63 MHz with pulse width of around 2 ns, so that only every 10th bunch in the CCR will experience a transverse kick while the rest of the bunches will not be disturbed. Such a kicker pulse can be synthesized by ten harmonic modes of the 47.63 MHz kicker pulse repetition frequency, using up to four quarter wavelength resonator (QWR) based deflecting cavities. In this paper, several methods to synthesize such a kicker waveform will be discussed and a comparison of their beam dynamics performance is made using ELEGANT. Four QWR cavities are envisaged with high transverse shuntmore » impedance requiring less than 100 W of total rf power for a Flat-Top kick pulse. Multipole fields due to the asymmetry of this type of cavity are analyzed. The transverse emittance growth due to the sextupole component is simulated in ELEGANT. In conclusion, off-axis injection and extraction issues and beam optics using a multicavity kick-drift scheme will also be discussed.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1328613
Alternate Identifier(s):
OSTI ID: 1306377
Report Number(s):
JLAB-ACC-16-2271; DOE/OR/23177-3819
Journal ID: ISSN 2469-9888; PRABFM; 084201
Grant/Contract Number:  
AC05-06OR23177
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 19 Journal Issue: 8; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Huang, Yulu, Wang, Haipeng, Rimmer, Robert A., Wang, Shaoheng, and Guo, Jiquan. Ultrafast harmonic rf kicker design and beam dynamics analysis for an energy recovery linac based electron circulator cooler ring. United States: N. p., 2016. Web. doi:10.1103/PhysRevAccelBeams.19.084201.
Huang, Yulu, Wang, Haipeng, Rimmer, Robert A., Wang, Shaoheng, & Guo, Jiquan. Ultrafast harmonic rf kicker design and beam dynamics analysis for an energy recovery linac based electron circulator cooler ring. United States. https://doi.org/10.1103/PhysRevAccelBeams.19.084201
Huang, Yulu, Wang, Haipeng, Rimmer, Robert A., Wang, Shaoheng, and Guo, Jiquan. 2016. "Ultrafast harmonic rf kicker design and beam dynamics analysis for an energy recovery linac based electron circulator cooler ring". United States. https://doi.org/10.1103/PhysRevAccelBeams.19.084201.
@article{osti_1328613,
title = {Ultrafast harmonic rf kicker design and beam dynamics analysis for an energy recovery linac based electron circulator cooler ring},
author = {Huang, Yulu and Wang, Haipeng and Rimmer, Robert A. and Wang, Shaoheng and Guo, Jiquan},
abstractNote = {An ultrafast kicker system is being developed for the energy recovery linac (ERL) based electron circulator cooler ring (CCR) in the proposed Jefferson Lab Electron Ion Collider (JLEIC, previously named MEIC). In the CCR, the injected electron bunches can be recirculated while performing ion cooling for 10–30 turns before the extraction, thus reducing the recirculation beam current in the ERL to 1/10–1/30 (150mA–50 mA) of the cooling beam current (up to 1.5 A). Assuming a bunch repetition rate of 476.3 MHz and a recirculating factor of 10 in the CCR, the kicker is required to operate at a pulse repetition rate of 47.63 MHz with pulse width of around 2 ns, so that only every 10th bunch in the CCR will experience a transverse kick while the rest of the bunches will not be disturbed. Such a kicker pulse can be synthesized by ten harmonic modes of the 47.63 MHz kicker pulse repetition frequency, using up to four quarter wavelength resonator (QWR) based deflecting cavities. In this paper, several methods to synthesize such a kicker waveform will be discussed and a comparison of their beam dynamics performance is made using ELEGANT. Four QWR cavities are envisaged with high transverse shunt impedance requiring less than 100 W of total rf power for a Flat-Top kick pulse. Multipole fields due to the asymmetry of this type of cavity are analyzed. The transverse emittance growth due to the sextupole component is simulated in ELEGANT. In conclusion, off-axis injection and extraction issues and beam optics using a multicavity kick-drift scheme will also be discussed.},
doi = {10.1103/PhysRevAccelBeams.19.084201},
url = {https://www.osti.gov/biblio/1328613}, journal = {Physical Review Accelerators and Beams},
issn = {2469-9888},
number = 8,
volume = 19,
place = {United States},
year = {Mon Aug 22 00:00:00 EDT 2016},
month = {Mon Aug 22 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at https://doi.org/10.1103/PhysRevAccelBeams.19.084201

Citation Metrics:
Cited by: 3 works
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Works referenced in this record:

Beam-beam kicker for superfast bunch handling
journal, May 1996


Compact noninvasive electron bunch-length monitor
journal, December 2012


Suppressing multipacting in a 56 MHz quarter wave resonator
journal, May 2010


Design, prototyping, and testing of a compact superconducting double quarter wave crab cavity
journal, April 2015


Design evolution and properties of superconducting parallel-bar rf-dipole deflecting and crabbing cavities
journal, January 2013


Emittance growth due to multipole transverse magnetic modes in an rf gun
journal, October 2011


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