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Title: Limitations Imposed by Beam-Beam Effects and Their Remedies II

Abstract

Effects that limit the luminosities of a general purpose linear collider (GLC) capable of spin polarized e{sup {+-}}e{sup {+-}}, gamma-e{sup {+-}} and spin polarized gamma-gamma channels are discussed together with mitigations. Previous results are extended to understand the differences between channels to maximize the generalized luminosity. A standard NLC configuration at square root s{sub ee} = 0.5 TeV is used for comparison. Without charge compensation or bunch shaping, such flat beam configurations (aspect ratios R* >>1) imply major disadvantages for e{sup {minus}} e{sup {minus}} due to the strong disruption (D) and small, longitudinal f-numbers (f{sub l}{number_sign} identical to beta*{sub y} /sigma{sub z}) that are imposed. Previous round and flat beam configurations are studied as functions of D(or f{sub b}{number_sign}), f{sub l}{number_sign} and the constraints Delta{sub B}, N{sub gamma} and Upsilon. Round beams with decreased disruptions and larger f{sub l}-stops are preferred with tensor beams, charge compensation or other bunch manipulation schemes. A low energy, high luminosity prototype is again proposed based on the possible physics.

Authors:
Publication Date:
Research Org.:
Stanford Linear Accelerator Center, Menlo Park, CA (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
763776
Report Number(s):
SLAC-PUB-8453
TRN: US0004812
DOE Contract Number:  
AC03-76SF00515
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 22 May 2000
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; LINEAR COLLIDERS; BEAM LUMINOSITY; POLARIZATION; BEAM BUNCHING; BEAM PROFILES; PERFORMANCE

Citation Formats

Spencer, James E. Limitations Imposed by Beam-Beam Effects and Their Remedies II. United States: N. p., 2000. Web. doi:10.2172/763776.
Spencer, James E. Limitations Imposed by Beam-Beam Effects and Their Remedies II. United States. doi:10.2172/763776.
Spencer, James E. Mon . "Limitations Imposed by Beam-Beam Effects and Their Remedies II". United States. doi:10.2172/763776. https://www.osti.gov/servlets/purl/763776.
@article{osti_763776,
title = {Limitations Imposed by Beam-Beam Effects and Their Remedies II},
author = {Spencer, James E.},
abstractNote = {Effects that limit the luminosities of a general purpose linear collider (GLC) capable of spin polarized e{sup {+-}}e{sup {+-}}, gamma-e{sup {+-}} and spin polarized gamma-gamma channels are discussed together with mitigations. Previous results are extended to understand the differences between channels to maximize the generalized luminosity. A standard NLC configuration at square root s{sub ee} = 0.5 TeV is used for comparison. Without charge compensation or bunch shaping, such flat beam configurations (aspect ratios R* >>1) imply major disadvantages for e{sup {minus}} e{sup {minus}} due to the strong disruption (D) and small, longitudinal f-numbers (f{sub l}{number_sign} identical to beta*{sub y} /sigma{sub z}) that are imposed. Previous round and flat beam configurations are studied as functions of D(or f{sub b}{number_sign}), f{sub l}{number_sign} and the constraints Delta{sub B}, N{sub gamma} and Upsilon. Round beams with decreased disruptions and larger f{sub l}-stops are preferred with tensor beams, charge compensation or other bunch manipulation schemes. A low energy, high luminosity prototype is again proposed based on the possible physics.},
doi = {10.2172/763776},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}

Technical Report:

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