CERN Accelerating science

Published Articles
Report number	CERN-ACC-2016-315 ; CLIC-Note-1087
Title	A Versatile Beam Loss Monitoring System for CLIC
Author(s)	Kastriotou, Maria (CERN ; Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Döbert, Steffen (CERN) ; Farabolini, Wilfrid (CERN) ; Holzer, Eva Barbara (CERN) ; Nebot Del Busto, Eduardo (CERN ; Liverpool U.) ; Tecker, Frank (CERN) ; Welsch, Carsten (Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech.)
Publication	2016
Number of pages	4
In:	7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.MOPMR024
DOI	10.18429/JACoW-IPAC2016-MOPMR024
Subject category	Accelerators and Storage Rings
Abstract	The design of a potential CLIC beam loss monitoring (BLM) system presents multiple challenges. To successfully cover the 48 km of beamline, ionisation chambers and optical fibre BLMs are under investigation. The former fulfils all CLIC requirements but would need more than 40000 monitors to protect the whole facility. For the latter, the capability of reconstructing the original loss position with a multi-bunch beam pulse and multiple loss locations still needs to be quantified. Two main sources of background for beam loss measurements are identified for CLIC. The two-beam accelerator scheme introduces so-called crosstalk, i.e. detection of losses originating in one beam line by the monitors protecting the other. Moreover, electrons emitted from the inner surface of RF cavities and boosted by the high RF gradients may produce signals in neighbouring BLMs, limiting their ability to detect real beam losses. This contribution presents the results of dedicated experiments performed in the CLIC Test Facility to quantify the position resolution of optical fibre BLMs in a multi-bunch, multi-loss scenario as well as the sensitivity limitations due to crosstalk and electron field emission.
Copyright/License	publication: © 2016-2024 The Author(s) (License: CC-BY-3.0)

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