Performance of the Two Aerogel Cherenkov Detectors of the JLab Hall A Hadron Spectrometer

Details Performance of the Two Aerogel Cherenkov Detectors of the JLab Hall A Hadron Spectrometer Performance of the Two Aerogel Cherenkov Detectors of the JLab Hall A Hadron Spectrometer

2008-10-25

arxiv.org/abs/0810.4630v1

Nuovo Cim.B124:99-114,2009

Physics

Instrumentation and Detectors

18 pages, 9 Figures, 4 Tables, 44 References

Scientific paper

10.1393/ncb/i2009-10743-5

We report on the design and commissioning of two silica aerogel Cherenkov detectors with different refractive indices. In particular, extraordinary performance in terms of the number of detected photoelectrons was achieved through an appropriate choice of PMT type and reflector, along with some design considerations. After four years of operation, the number of detected photoelectrons was found to be noticeably reduced in both detectors as a result of contamination, yellowing, of the aerogel material. Along with the details of the set-up, we illustrate the characteristics of the detectors during different time periods and the probable causes of the contamination. In particular we show that the replacement of the contaminated aerogel and parts of the reflecting material has almost restored the initial performance of the detectors.

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