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The HARP TPC laser calibration system

โœ Scribed by Gabriel Vidal-Sitjes

Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
170 KB
Volume
518
Category
Article
ISSN
0168-9002

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โœฆ Synopsis

A novel apparatus for the calibration of the HARP Time Projection Chamber has been designed, developed and built. The apparatus consists of a large number of point-like photo-electron sources located at precise positions inside the detector volume. The photo-electron sources are optical quartz fibers on which one end is coated with an aluminum layer of B80 ( A thickness and are held in place on the high-voltage membrane. The fibers are used to guide UV laser light pulses that generate photoelectrons on the fiber tips acting as photo-electron emitters. The photo-electrons drift inside the detector and produce the calibration signals. The technique allows to assess E ร‚ B distortions and to measure drift velocity, ion feedback and time stability in real time.

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