| Summary |
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| • | R5900 MA PMTs have proven to be an |
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| extremly
reliable and easy to use |
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| detector
for Cherenkov photons. |
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| • | Several new methods were developed for |
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| the
design of the detector surface, |
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| analysis
of data and alignment of the |
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| optical
system. |
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| • | The
HERA-B RICH counter showed an |
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| excellent
performance in very adverse |
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| conditions. |
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