Abstract
In March 2012 the high voltage system of thesilicon-sensor-based CMS Preshower detector underwent a significant upgrade.In order to increase the granularity of the bias distribution lines, thenumber of power supplies was doubled and fully configurable distributionboards were developed and installed. These new boards provide much improvedflexibility in the powering, necessary to cope with the expected evolutionof the 4288 silicon sensors with radiation damage. They also providemeasurement of the ∼ 2200 bias-voltage lines that go to the detector,enabling fast identification/diagnosis of any anomalous currents andproviding detailed knowledge of the sensor current evolution over time.
Highlights
In March 2012 the high voltage system of the silicon-sensor-based CMS Preshower detector underwent a significant upgrade
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
A calibration setup has been prepared in the CMS ECAL Detector Control System (DCS) laboratory to provide a complete understanding of the readout characteristics and to allow a precise correlation between the distributed BV lines and the power supply channel
Summary
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.
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