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Title: Proposal to Modify the Polarimeter Chicane in the ILC 14 mrad Extraction Line

Abstract

A proposal is presented in this paper to modify the extraction line polarimeter chicane to allow the Compton backscattered electrons to be deflected further from the beam line, and to provide optics for the downstream GAMCAL detector.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
901838
Report Number(s):
SLAC-PUB-12425
TRN: US200717%%3
DOE Contract Number:
AC02-76SF00515
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM EXTRACTION; ELECTRONS; BACKSCATTERING; POLARIMETERS; MODIFICATIONS; ACCELERATOR FACILITIES; Accelerators,ACCPHY, ACCSYS

Citation Formats

Moffeit, Ken, Maruyama, Takashi, Nosochkov, Yuri, Seryi, Andrei, Woodley, Mark, Woods, Mike, and /SLAC. Proposal to Modify the Polarimeter Chicane in the ILC 14 mrad Extraction Line. United States: N. p., 2007. Web. doi:10.2172/901838.
Moffeit, Ken, Maruyama, Takashi, Nosochkov, Yuri, Seryi, Andrei, Woodley, Mark, Woods, Mike, & /SLAC. Proposal to Modify the Polarimeter Chicane in the ILC 14 mrad Extraction Line. United States. doi:10.2172/901838.
Moffeit, Ken, Maruyama, Takashi, Nosochkov, Yuri, Seryi, Andrei, Woodley, Mark, Woods, Mike, and /SLAC. Wed . "Proposal to Modify the Polarimeter Chicane in the ILC 14 mrad Extraction Line". United States. doi:10.2172/901838. https://www.osti.gov/servlets/purl/901838.
@article{osti_901838,
title = {Proposal to Modify the Polarimeter Chicane in the ILC 14 mrad Extraction Line},
author = {Moffeit, Ken and Maruyama, Takashi and Nosochkov, Yuri and Seryi, Andrei and Woodley, Mark and Woods, Mike and /SLAC},
abstractNote = {A proposal is presented in this paper to modify the extraction line polarimeter chicane to allow the Compton backscattered electrons to be deflected further from the beam line, and to provide optics for the downstream GAMCAL detector.},
doi = {10.2172/901838},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Apr 04 00:00:00 EDT 2007},
month = {Wed Apr 04 00:00:00 EDT 2007}
}

Technical Report:

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  • This paper presents calculations of detector solenoid effects on disrupted primary beam in the ILC 14 mrad extraction line. Particle tracking simulations are performed for evaluation of primary beam loss along the line as well as of beam distribution and polarization at Compton Interaction Point. The calculations are done both without and with solenoid compensation. The results are obtained for the baseline ILC energy of 500 GeV center-of-mass and three options of beam parameters.
  • The ILC baseline extraction line is designed for 14 mrad horizontal crossing angle between e{sup +} and e{sup -} colliding beams at Interaction Point (IP). The extraction optics in the Interaction Region (IR) includes a detector integrated dipole field (anti-DID) to reduce orbit perturbation caused by the detector solenoid and minimize detector background. This paper presents a study of random field and alignment errors in the extraction magnets, compensation of the induced orbit perturbation, and effects of errors on extraction beam power loss. The results are obtained for the baseline ILC energy of 500 GeV center-of-mass and three options ofmore » beam parameters.« less
  • The earlier studies of the ILC extraction line for 20 mrad and 2 mrad crossing angle options [1]-[5] showed that the 20 mrad design has an advantage of a simpler beamline and lower extraction beam loss because of the independent incoming and extraction optics. However, the large 20 mrad crossing angle requires the use of a crab cavity correction, increases synchrotron radiation emittance growth in the solenoid, and increases photon backscattering from the forward calorimeter of the detector. To reduce these effects, an attempt has been made to minimize the crossing angle while keeping the extraction and incoming lines separate.more » A new quadrupole scheme near the interaction point has been proposed which allows a reduction of the crossing angle to 14 mrad [6]. The optics design and results of tracking and background simulations for the 14 mrad extraction line are presented.« less
  • A study of the beam distributions in the 2 mrad and 14/20 mrad extraction lines are presented. Beam losses, energy losses due to synchrotron radiation and spin diffusion are shown. Synchrotron radiation distributions generated by the beam as it traverses the extraction lines are studied.
  • In this paper, we perform a detailed study of the power losses along the postcollision extraction line of a TeV e+e- collider with a crossing angle of 20 mrad between the beams at the interaction point. Five cases are considered here: four luminosity configurations for ILC and one for CLIC. For all of them, the strong beam-beam effects at the interaction point lead to an emittance growth for the outgoing beams, as well as to the production of beamstrahlung photons and e+e- pairs. The power losses along the 20 mrad extraction line, which are due to energy deposition by amore » fraction of the disrupted beam, of the beamstrahlung photons and of the e+e- coherent pairs, were estimated in the case of ideal collisions, as well as with a vertical position or angular o set at the interaction point.« less