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Beam profile monitoring at the test beam line at the Compact Linear Collider test facility

M. Olvegård1,2,*, E. Adli1,3, W. Andreazza1, B. Bolzon1, E. Bravin1, N. Chritin1, A. Dabrowski1, S. Döbert1, M. Duraffourg1 et al.

T. Lefèvre1, R. Lillestøl1,3, and V. Ziemann2

  • 1CERN, European Organization of Nuclear Research, 1211 Genève 23, Switzerland
  • 2Uppsala University, Department of Physics and Astronomy, Box 516, 751 20 Uppsala, Sweden
  • 3University of Oslo, Boks 1072 Blindern, 0316 Oslo, Norway

  • *maja.olvegard@physics.uu.se
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Phys. Rev. ST Accel. Beams 16, 082802 – Published 27 August, 2013

DOI: https://doi.org/10.1103/PhysRevSTAB.16.082802

Abstract

The Compact Linear Collider (CLIC) is a study for a future linear electron-positron collider based on a two-beam acceleration scheme in which a high-intensity drive beam is decelerated in order to provide the power to accelerate the main beam for collision in the TeV range. The power extracted from the drive beam deteriorates the beam quality and increases the energy spread significantly. Monitoring of the beam properties is therefore challenging but essential. These challenges are being addressed experimentally at the CLIC test facility where up to 55% of the power is extracted from the beam in the test beam line, a small-scale version of the CLIC drive-beam decelerator, leaving the beam with a very wide energy profile. For monitoring of the transverse beam profile and Twiss parameters we use optical transition radiation screens and quadrupole scans. The intra-pulse-train energy spectrum before and after deceleration is measured with segmented beam dumps. In this paper we discuss the performance of these diagnostic devices with a particular emphasis on the large energy spread and its effect on the beam imaging techniques, and with a final outlook to the CLIC drive-beam diagnostics.

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Phys. Rev. ST Accel. Beams 16, 082802– Published 27 August, 2013
  • Received 30 March 2012
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