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Title: ILC Extraction Line for 14 mrad Crossing Angle

Abstract

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. 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.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
877517
Report Number(s):
SLAC-PUB-11591
TRN: US0601542
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Presented at 36th ICFA Advanced Beam Dynamics Workshop (NANOBEAM 2005), Kyoto, Japan, 17-21 Oct 2005
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BACKSCATTERING; BEAM DYNAMICS; CALORIMETERS; DESIGN; OPTICS; PHOTONS; QUADRUPOLES; SYNCHROTRON RADIATION; Accelerators,ACCPHY

Citation Formats

Nosochkov, Y., Markiewicz, T., Maruyama, T., Seryi, A., /SLAC, Parker, B., and /Brookhaven. ILC Extraction Line for 14 mrad Crossing Angle. United States: N. p., 2005. Web.
Nosochkov, Y., Markiewicz, T., Maruyama, T., Seryi, A., /SLAC, Parker, B., & /Brookhaven. ILC Extraction Line for 14 mrad Crossing Angle. United States.
Nosochkov, Y., Markiewicz, T., Maruyama, T., Seryi, A., /SLAC, Parker, B., and /Brookhaven. Thu . "ILC Extraction Line for 14 mrad Crossing Angle". United States. doi:. https://www.osti.gov/servlets/purl/877517.
@article{osti_877517,
title = {ILC Extraction Line for 14 mrad Crossing Angle},
author = {Nosochkov, Y. and Markiewicz, T. and Maruyama, T. and Seryi, A. and /SLAC and Parker, B. and /Brookhaven},
abstractNote = {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. 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Dec 08 00:00:00 EST 2005},
month = {Thu Dec 08 00:00:00 EST 2005}
}

Conference:
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  • One of the two ILC Interaction Regions will have a large horizontal crossing angle which would allow to extract the spent beams in a separate beam line. In this paper, the extraction line design for 20 mrad crossing angle is presented. This beam line transports the primary e{sup +}/e{sup -} and beamstrahlung photon beams from the IP to a common dump, and includes diagnostic section for energy and polarization measurements. The optics is designed for a large energy acceptance to minimize losses in the low energy tail of the disrupted beam. The extraction optics, diagnostic instrumentation and particle tracking simulationsmore » are described.« less
  • The ILC extraction line for 2 mrad crossing angle is under development by the SLAC-BNL-UK-France task force collaboration. This report describes the progress in the 2 mrad optics design which includes the changes to the final focus doublet, the complete optics for the extraction diagnostics, and the changes to the sextupole and collimation systems. The results of disrupted beam tracking simulations are presented.
  • 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.
  • The studies of the ILC extraction line design have been carried out by the SLAC-BNL-UK-France task force collaboration. In this paper, we describe two options of the extraction optics for the 20 mrad horizontal crossing angle in the Interaction Region (IR), and one option of the 2 mrad extraction optics. The main functions of the extraction line are to transport the primary beam and beamstrahlung photons to dumps with acceptable beam loss, and to provide the necessary optics for beam diagnostics. The presented 20 mrad and 2 mrad optics are designed for up to 1 TeV and 0.5 TeV Centermore » of Mass (CM) energy, respectively. The upgrade of this 2 mrad design to 1 TeV CM and a separate version of the 2 mrad design are presented in a separate report [1].« less
  • The authors have performed a detailed study of the power losses in the post-collision extraction line of a TeV e{sup +}e{sup -} collider with a crossing angle of 20 mrad at the interaction point. Five cases were considered: 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 beam, as well as to the production of beamstrahlung photons and e{sup +}e{sup -} coherent pairs. The power losses along the extraction line, which are due to energy deposition by a fraction ofmore » the disrupted beam, of the beamstrahlung photons and of the coherent pairs, were estimated in the case of ideal collisions, as well as with a vertical position or angular offset at the interaction point.« less