CERN Accelerating science

Article
Report number	CERN-ACC-2013-0293
Title	Application of Metal-Semiconductor-Metal (MSM) Photodetectors for Transverse and Longitudinal Intra-Bunch Beam Diagnostics
Author(s)	Steinhagen, R J (CERN) ; Mitsuhashi, T (KEK, Tsukuba) ; Boland, M J (ASP, Melbourne) ; Lucas, T G (U. Melbourne (main)) ; Rassool, R P (U. Melbourne (main))
Publication	2013
Imprint	01 Sep 2013
Number of pages	4
In:	2nd International Beam Instrumentation Conference, Oxford, UK, 16 - 19 Sep 2013, pp.MOPC20
Subject category	Accelerators and Storage Rings
Free keywords	Metal-Semiconductor-Metal ; MSM ; Photodetectors ; Intra-bunch beam diagnostics
Abstract	The performance reach of modern accelerators is often governed by the ability to reliably measure and control the beam stability. In high-brightness lepton and high-energy hadron accelerators, the use of optical diagnostic techniques is becoming more widespread as the required bandwidth, resolution and high RF beam power level involved limit the use of traditional electro-magnetic RF pick-up based methods. This contribution discusses the use of fibre-coupled ultra-fast Metal-Semiconductor-Metal Photodetectors (MSM-PD) as an alternative, dependablemeans to measure signals derived from electro-optical and synchrotron-light based diagnostics systems. It describes the beam studies performed at CERN’s CLIC Test Facility (CTF3) and the Australian Synchrotron to assess the feasibility of this technology as a robust, wide-band and sensitive technique for measuring transverse intra-bunch and bunch-by-bunch beam oscillations, longitudinal beam profiles, un-bunched beam population and beam-halo profiles. The amplification schemes, achieved sensitivities, linearity, and dynamic range of the detector setup are presented.

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