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ABSORPTION LENGTH STATUS (group meeting) HAROLD YEPES RAMIREZ IFIC, December 17 th 2009

ABSORPTION LENGTH STATUS (group meeting) HAROLD YEPES RAMIREZ IFIC, December 17 th 2009. DATA TAKING There are not new optical properties runs available  mean rates over the detector ~150 kHz. DATA ANALYSIS

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ABSORPTION LENGTH STATUS (group meeting) HAROLD YEPES RAMIREZ IFIC, December 17 th 2009

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  1. ABSORPTION LENGTH STATUS (group meeting) HAROLD YEPES RAMIREZ IFIC, December 17th 2009

  2. DATA TAKING • There are not new optical properties runs available  mean rates over the detector ~150 kHz. • DATA ANALYSIS • First draft of absorption length paper for Nuclear Instruments and Methods Journal (from VLVnT09 proceedings) is ready for comments and corrections, deadline January 15th, to upload it into web page. • Checking the LEDs model for L12F2 beacon (KM3NeT prototype): • UV (Cleaved)  950 nJ • CB 30  200 nJ • CB 15 (Cleaved-ANTARES)  50 nJ

  3. Procedure: • Compute the velocity of light for all LEDs ID  Low statistics  No phe level analysis  1/v as reference parameter: • ¿Why do we have lack of statistics for UV runs?

  4. Procedure: • Take a look over charge distributions: • Summary  blue LEDs classified by energy:

  5. DATA ANALYSIS • Charge -Time distributions for signal hits OM by OM  photoelectron region is considered: PHOTOELECTRON REGION RUN: 33983 [90, 220] ≡ [F9, F17]

  6. DEAD CHANNEL DEAD CHANNEL

  7. DATA ANALYSIS • Charge -Time distributions for signal hits OM by OM  photoelectron region is considered: PHOTOELECTRON REGION RUN: 36035 [60, 220] ≡ [F7, F17]

  8. Low efficiency OM (low efficiency cleaning)

  9. Low efficiency OM (low efficiency cleaning)

  10. To other golden runs we have similar distributions where we can see the hits and charge losses: • http://ific.uv.es/~yepes/optical_properties/distributions/ • Do we need to consider a new cleaning based on the charge losses for the OMs? •  A new preliminary visual inspection is required?

  11. DATA ANALYSIS • The summary of the last group meeting  Tmax influence over values for L parameter (10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 200, 300, 400, 500, 600, 1000) ~ Inputs MC (18 runs) • Real data: each point corresponds to the mean value of the distribution of 18 runs in each time window. Monte Carlo Real data TO CHECK…

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