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Title: Trapped modes in the PEP-II B-Factory Interaction Region

Abstract

The design of the PEP-II B-Factory Interaction Region is based primarily on beam-stay-clear requirements and on synchrotron radiation background considerations (masks are required to shield the detector beam pipe from all sources of synchrotron radiation). A complicated 3-dimensional structure results from these requirements. A high intensity beam traversing this structure will generate wake fields that lead to energy deposition on the beam pipe, as well as to decelerating and deflecting forces acting back on the beam. Computation of wake fields and impedances in frequency-domain and time-domain using 2-D and 3-D electromagnetic codes revealed the existence of trapped modes in the interaction region, which if not controlled could enhance the higher order model heating of the beam pipe. We will present the simulation results and the design strategy to avoid resonant conditions between these trapped modes and the bunch train frequency.

Authors:
 [1]; ;  [2]
  1. Lawrence Berkeley Lab., CA (United States)
  2. Stanford Linear Accelerator Center, Menlo Park, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
96803
Report Number(s):
LBL-37160; CONF-950512-294
ON: DE95016421; TRN: 95:018646
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Conference
Resource Relation:
Conference: 16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995; Other Information: PBD: Apr 1995
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; PEP STORAGE RINGS; TRAPS; B MESONS; MESON FACTORIES; RADIATION HEATING; DESIGN; SYNCHROTRON RADIATION; SYNCHROTRON RADIATION SOURCES

Citation Formats

Henestroza, E, Heifets, S, and Zolotorev, M. Trapped modes in the PEP-II B-Factory Interaction Region. United States: N. p., 1995. Web.
Henestroza, E, Heifets, S, & Zolotorev, M. Trapped modes in the PEP-II B-Factory Interaction Region. United States.
Henestroza, E, Heifets, S, and Zolotorev, M. 1995. "Trapped modes in the PEP-II B-Factory Interaction Region". United States. https://www.osti.gov/servlets/purl/96803.
@article{osti_96803,
title = {Trapped modes in the PEP-II B-Factory Interaction Region},
author = {Henestroza, E and Heifets, S and Zolotorev, M},
abstractNote = {The design of the PEP-II B-Factory Interaction Region is based primarily on beam-stay-clear requirements and on synchrotron radiation background considerations (masks are required to shield the detector beam pipe from all sources of synchrotron radiation). A complicated 3-dimensional structure results from these requirements. A high intensity beam traversing this structure will generate wake fields that lead to energy deposition on the beam pipe, as well as to decelerating and deflecting forces acting back on the beam. Computation of wake fields and impedances in frequency-domain and time-domain using 2-D and 3-D electromagnetic codes revealed the existence of trapped modes in the interaction region, which if not controlled could enhance the higher order model heating of the beam pipe. We will present the simulation results and the design strategy to avoid resonant conditions between these trapped modes and the bunch train frequency.},
doi = {},
url = {https://www.osti.gov/biblio/96803}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {4}
}

Conference:
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