1. STATUS OF THE CHERENKOV DETECTOR
Johannes Gutenberg-Universitaet
Mainz
Institut fuer Kernphysik
STATUS OF THE CHERENKOV DETECTOR
FOR THE EXPERIMENT
11 th Collaboration Meeting
Dubrovnik, 7 April 2008
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2. Schematic View
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3. Cherenkov Setup Gas Volume aprox. 1 m3 Cherenkov Gas (C4F8)
Gas Filter System
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4. Setup & Trigger P3 and P2 in coincidence with Tagger
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5. Cherenkov Counts Good linearity Exclusion of pile-up effect
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6. EnergyP3 vs EnergyP2
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7. ADC Spectrum for 1 electron
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8. ADC Spectrum for 2 electrons
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9. Analysis Conditions
We define a good e- as if it hits the 3 scintillators (P3, P2, P1)
All have the same TDC time window
We apply cuts to select only the events around the PROMPT peak
The Efficiency is calculated like
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10. Efficiency Results
20 cm
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11. Summary and outlook Conclusions Cherenkov and Gas system are mounted
Test measurement for the Efficiency was performed with the detector
partially filled with C4F8
Maximum Efficiency value was %
Future
Fill completely the detector with C4F8
New measurement for the Efficiency
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