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Title: Coupled Bunch Instability from JLEIC Crab Cavity Higher Order Modes

Abstract

Particle bunches traveling in a ring can excite wakefields inside any radio-frequency (rf) element present. These electromagnetic modes can resonate long enough and interact with subsequent passing bunches. A coherent oscillation between bunches can quickly become an instability and needs to be addressed. The Jefferson Lab Electron-Ion Collider (JLEIC) has a large 50 mrad crossing angle and thus relies on bunch crabbing to achieve high luminosity. Bunch crabbing is done with compact superconducting rf dipole cavities. We study coupled bunch oscillations driven by the higher order modes (HOM) of multi-cell rf dipole (rfd) crab cavities under study for JLEIC, we calculate the instability growth time assuming a symmetric beam frequency spectrum, identify the HOM driving the instability and discuss mitigation measures.

Authors:
 [1];  [1];  [1];  [2];  [3];  [3]
  1. Old Dominion Univ., Norfolk, VA (United States)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Old Dominion Univ., Norfolk, VA (United States)
  3. 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 Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1473839
Report Number(s):
JLAB-ACP-18-2764; DOE/OR/23177-4493
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: IPAC 2018, 29 Apr - 04 May 2018. Vancouver, BC Canada
Country of Publication:
United States
Language:
English

Citation Formats

Sosa Guitron, Salvador I., de Silva, Subashini U., Delayen, Jean R., Park, HyeKyoung, Li, Rui, and Morozov, Vasiliy. Coupled Bunch Instability from JLEIC Crab Cavity Higher Order Modes. United States: N. p., 2018. Web. doi:10.18429/JACoW-IPAC2018-THPAK070.
Sosa Guitron, Salvador I., de Silva, Subashini U., Delayen, Jean R., Park, HyeKyoung, Li, Rui, & Morozov, Vasiliy. Coupled Bunch Instability from JLEIC Crab Cavity Higher Order Modes. United States. doi:10.18429/JACoW-IPAC2018-THPAK070.
Sosa Guitron, Salvador I., de Silva, Subashini U., Delayen, Jean R., Park, HyeKyoung, Li, Rui, and Morozov, Vasiliy. Sun . "Coupled Bunch Instability from JLEIC Crab Cavity Higher Order Modes". United States. doi:10.18429/JACoW-IPAC2018-THPAK070. https://www.osti.gov/servlets/purl/1473839.
@article{osti_1473839,
title = {Coupled Bunch Instability from JLEIC Crab Cavity Higher Order Modes},
author = {Sosa Guitron, Salvador I. and de Silva, Subashini U. and Delayen, Jean R. and Park, HyeKyoung and Li, Rui and Morozov, Vasiliy},
abstractNote = {Particle bunches traveling in a ring can excite wakefields inside any radio-frequency (rf) element present. These electromagnetic modes can resonate long enough and interact with subsequent passing bunches. A coherent oscillation between bunches can quickly become an instability and needs to be addressed. The Jefferson Lab Electron-Ion Collider (JLEIC) has a large 50 mrad crossing angle and thus relies on bunch crabbing to achieve high luminosity. Bunch crabbing is done with compact superconducting rf dipole cavities. We study coupled bunch oscillations driven by the higher order modes (HOM) of multi-cell rf dipole (rfd) crab cavities under study for JLEIC, we calculate the instability growth time assuming a symmetric beam frequency spectrum, identify the HOM driving the instability and discuss mitigation measures.},
doi = {10.18429/JACoW-IPAC2018-THPAK070},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {7}
}

Conference:
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