CERN Accelerating science

CMS Note
Report number	CMS-CR-2012-290
Title	The Upgraded CMS Preshower High Voltage System
Author(s)	Vichoudis, Paschalis (CERN)
Collaboration	for the CMS Collaboration
Publication	2013
Imprint	31 Oct 2012
Number of pages	9
In:	JINST 8 (2013) C01050
In:	Topical Workshop on Electronics for Particle Physics, Oxford, UK, 17 - 21 Sep 2012, pp.C01050
DOI	10.1088/1748-0221/8/01/C01050
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	In March 2012 the high voltage system of the silicon-sensor-based CMS Preshower detector underwent a significant upgrade. In order to increase the granularity of the bias distribution lines, the number of power supplies was doubled and fully configurable distribution boards were developed and installed. These new boards provide much improved flexibility in the powering, necessary to cope with the expected evolution of the 4288 silicon sensors with radiation damage. They also provide measurement of the  2200 bias-voltage lines that go to the detector, enabling fast identification/diagnosis of any anomalous currents and providing detailed knowledge of the sensor current evolution over time.
Copyright/License	Publication: (License: CC-BY-3.0)

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