Directional Cerenkov Detectors

Details Directional Cerenkov Detectors Directional Cerenkov Detectors

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aps..dnp.mh004n&link_type=abstract

American Physical Society, 2008 Annual Meeting of the Division of Nuclear Physics, October 23-26, 2008, abstract #MH.004

Physics

Nuclear Physics

Scientific paper

It is sometimes useful to have a particle detector that determines not only the amount of energy deposited in the detector but also the direction from which it came. With a colliding beam machine, such as the LHC, at small angles a detector is exposed both to particles coming from the interaction region and to particles produced by incoming beam particles. A directional detector can identify and enable the elimination of the background from the incoming beam. A charged particle with the velocity of light passing through a medium with an index of refraction n emits (Cerenkov) light at an angle θc with respect to its direction such that cosθc = 1/n. This angle is 45^o for n = 1.414. Directional counters can be made by using the directional properties of the Cerenkov light. A photomultiplier tube, by itself, acts as such a detector by responding to Cerenkov light produced in the glass over the photocathode. Various counter configurations have been studied using cosmic- ray muons identified by cosmic-ray telescopes from the NSF-DOE QuarkNet program. These counters are candidates for Forward Shower Counters (FSC) for the CMS experiment at the LHC.

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