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Title: Crab cavity requirements for the Jefferson Lab Electron-Ion Collider

Abstract

An Electron-Ion Collider (EIC) has been proposed to be the next large facility to explore the dynamics of quarks and gluons inside nuclei. A conceptual design for a Jefferson Lab Electron-Ion Collider (JLEIC) is being developed. It is based on the CEBAF 12 GeV machine as a full energy electron beam injector. Two crucial requirements of JLEIC are high luminosity in the 10 34 cm -2s -1 range, and full acceptance detection of particles. The full acceptance requirement relies on having the beams collide at a relatively large crossing angle of 50 mrad. Such a large crossing angle, however, can reduce the luminosity by as much as an order of magnitude. One way to compensate for geometric luminosity loss due to the beam crossing angle is using crab cavities. Crab cavities are superconducting radio-frequency structures optimized to produce a transverse force that 'tilts' the beam bunches in such a way that a head-on collision is restored at the collision point, thus restoring the luminosity. A second set of crab cavities is placed downstream of the collision point and is used to cancel the initial bunch tilt, ideally suppressing any crab-induced effects anywhere else in the rings. In this dissertation, wemore » study the dynamics of JLEIC beams with a bunch crabbing scheme using particle tracking simulations. We first evaluate the beam stability when crab cavities are included in the collider rings and then use this stable model to study effects of crab cavity multipoles and RF noise. We also study the role of crab cavity higher-order modes (HOM) in driving coupled-bunch instability and identify dangerous HOM which need to be damped. A specific crab cavity for JLEIC has not yet been selected. It is the purpose of this dissertation to provide general requirements and tolerances to make future crab cavity designs compatible with JLEIC.« less

Authors:
 [1]
  1. Old Dominion Univ., Norfolk, VA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1491672
Report Number(s):
JLAB-ACC-18-2893; DOE/OR/23177-4631
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English

Citation Formats

Sosa Guitron, Salvador. Crab cavity requirements for the Jefferson Lab Electron-Ion Collider. United States: N. p., 2018. Web. doi:10.2172/1491672.
Sosa Guitron, Salvador. Crab cavity requirements for the Jefferson Lab Electron-Ion Collider. United States. doi:10.2172/1491672.
Sosa Guitron, Salvador. Sat . "Crab cavity requirements for the Jefferson Lab Electron-Ion Collider". United States. doi:10.2172/1491672. https://www.osti.gov/servlets/purl/1491672.
@article{osti_1491672,
title = {Crab cavity requirements for the Jefferson Lab Electron-Ion Collider},
author = {Sosa Guitron, Salvador},
abstractNote = {An Electron-Ion Collider (EIC) has been proposed to be the next large facility to explore the dynamics of quarks and gluons inside nuclei. A conceptual design for a Jefferson Lab Electron-Ion Collider (JLEIC) is being developed. It is based on the CEBAF 12 GeV machine as a full energy electron beam injector. Two crucial requirements of JLEIC are high luminosity in the 1034 cm-2s-1 range, and full acceptance detection of particles. The full acceptance requirement relies on having the beams collide at a relatively large crossing angle of 50 mrad. Such a large crossing angle, however, can reduce the luminosity by as much as an order of magnitude. One way to compensate for geometric luminosity loss due to the beam crossing angle is using crab cavities. Crab cavities are superconducting radio-frequency structures optimized to produce a transverse force that 'tilts' the beam bunches in such a way that a head-on collision is restored at the collision point, thus restoring the luminosity. A second set of crab cavities is placed downstream of the collision point and is used to cancel the initial bunch tilt, ideally suppressing any crab-induced effects anywhere else in the rings. In this dissertation, we study the dynamics of JLEIC beams with a bunch crabbing scheme using particle tracking simulations. We first evaluate the beam stability when crab cavities are included in the collider rings and then use this stable model to study effects of crab cavity multipoles and RF noise. We also study the role of crab cavity higher-order modes (HOM) in driving coupled-bunch instability and identify dangerous HOM which need to be damped. A specific crab cavity for JLEIC has not yet been selected. It is the purpose of this dissertation to provide general requirements and tolerances to make future crab cavity designs compatible with JLEIC.},
doi = {10.2172/1491672},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {12}
}

Thesis/Dissertation:
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