Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 28: Instrumentation and Applications III

HK 28.3: Talk

Wednesday, March 13, 2002, 11:30–11:45, F

Beam Loss Monitor for HERMES — •Andreas Reischl, Martin van Beuzekom, Othmane Bouhali, Sander Mos, and Jos Stejiger — NIKHEF POBox 41882, 1009 DB Amsterdam, The Netherlands

A Beam Loss Monitor (BLM), made of ionization chambers, has been designed and constructed. It is installed in the HERMES front region and will be used as a fast trigger for the HERA lepton-beam dump kicker. The aim is to protect radiation sensitive detector components like the so called Lambda Wheels, Recoil Detector and the target cell etc., against accidental beam losses. A sudden and large increase in the radiation level near the experiment is a suitable indication of beam inabilities leading to a loss of beam. The amount of radiation caused by these accidents can be reduced greatly by kicking the beam out of the machine. The detector system and the beam dump magnet have to be fast. The detector, together with a fast electronic trigger and an optical link (about 4km) which route the trigger signal, serves the kicker magnets, which can be powered in a sufficiently short time. We report of the design principles, the calibration done on a X-Ray generator and the first results of tests done at HERMES in the fall of 2001.