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Design and operation of a prototype interaction point beam collision feedback system for the International Linear Collider

R. J. Apsimon*, D. R. Bett, N. Blaskovic Kraljevic†, R. M. Bodenstein, T. Bromwich, P. N. Burrows, G. B. Christian‡, B. D. Constance, M. R. Davis et al.

C. Perry and R. Ramjiawan

  • John Adams Institute for Accelerator Science at University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United Kingdom
  • *Present address: Cockcroft Institute, University of Lancaster, United Kingdom.
  • †Present address: CERN, Geneva, Switzerland. neven.blaskovic.kraljevic@cern.ch
  • ‡Present address: Diamond Light Source, Harwell, United Kingdom.
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Phys. Rev. Accel. Beams 21, 122802 – Published 17 December, 2018

DOI: https://doi.org/10.1103/PhysRevAccelBeams.21.122802

Abstract

A high-resolution, intratrain position feedback system has been developed to achieve and maintain collisions at the proposed future electron-positron International Linear Collider (ILC). A prototype has been commissioned and tested with a beam in the extraction line of the Accelerator Test Facility at the High Energy Accelerator Research Organization in Japan. It consists of a stripline beam position monitor (BPM) with analogue signal-processing electronics, a custom digital board to perform the feedback calculation, and a stripline kicker driven by a high-current amplifier. The closed-loop feedback latency is 148 ns. For a three-bunch train with 154 ns bunch spacing, the feedback system has been used to stabilize the third bunch to 450 nm. The kicker response is linear, and the feedback performance is maintained, over a correction range of over ±60  μm. The propagation of the correction has been confirmed by using an independent stripline BPM located downstream of the feedback system. The system has been demonstrated to meet the BPM resolution, beam kick, and latency requirements for the ILC.

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Phys. Rev. Accel. Beams 21, 122802– Published 17 December, 2018
  • Received 13 December 2017
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