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Current status for FRP dark measurement

Current status for FRP dark measurement. 22 nd Jun. 2005 T.Sato. PMT dark rate FRP BG included PMT dark rate Current status (Na lamp) Summary. PMT dark rate. Before 1 st measurement of the 2002 FRP exposure to Na lamp. ～ 7kHz. Before 2 nd measurement of the 2002

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Current status for FRP dark measurement

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  1. Current status for FRP dark measurement 22nd Jun. 2005 T.Sato PMT dark rate FRP BG included PMT dark rate Current status (Na lamp) Summary

  2. PMT dark rate Before 1st measurement of the 2002 FRP exposure to Na lamp ～7kHz Before 2nd measurement of the 2002 FRP exposure to Na lamp Before 1st measurement of the 2005 FRP exposure to Na lamp ～6.5kHz

  3. FRP BG included PMT dark rate 2002 FRP BG : ～10kHz 2005 FRP Excess : 3～3.5kHz 2005 FRP BG : 30～35kHz Excess : 23.5～24kHz 2002 FRP It might have rising trend for 2005 FRP BG .

  4. Current status I 2005 FRP Excess from PMT dark Raw data 2002 FRP 6.5kHz subtracted 6.5kHz subtracted PMT dark 7.0kHz subtracted 2005 FRP measurement is continued now !

  5. Current status II 2005 FRP Excess from FRP BG & PMT dark Raw data 32.5kHz subtracted FRP BG (2005) & PMT dark FRP BG (2002) & PMT dark 2002 FRP 10.0kHz subtracted

  6. Current status III 32.5kHz subtracted case 35.0kHz subtracted case 4kHz 3kHz 2kHz It has about 4kHz remaining to reach FPR BG & PMT dark level. It has about 1kHz remaining to reach FPR BG & PMT dark level.

  7. Summary • There has been a excess from FRP BG & PMT dark yet. • 2005 FRP data is strange in recent days. • We must check the electronics, because it may have trouble.

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