ABSORPTION LENGTH STATUS
(group meeting)
HAROLD YEPES RAMIREZ
IFIC, December 17th 2009
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
LED ID [nm] Power [nW] – Energy (nJ)
UV (Cleaved) 400 (uv) 950 nJ
UV (Cleaved) 400 (uv) 950 nJ
CB 30 470 (blue) 13 nW – 200 nJ
AB 87 470 (blue) 30 nW
NSPB 500S 470 (blue) 97 nW
CB 26 470 (blue) 32 nW
Procedure:
1. 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?
Run (beacon face) 1/v [ns/m]
45159 (1) 4.74 (uv)
45160 (2) 4.74 (uv)
45161 (3) 4.67 (blue)
45162 (4) 4.67 (blue)
45163 (5) 4.67 (blue)
45164 (6) 4.67 (blue)
Procedure:
2. Take a look over charge distributions:
3. Summary blue LEDs classified by energy:
Run Charge integral (F6) Charge integral (F9)
45159 7.07*10^4 (uv) 2.1*10^4 (uv)
45160 9.31*10^4 (uv) 2.7*10^4 (uv)
45161 1.13*10^5 (blue) 8.37*10^4 (blue)
45162 9.26*10^4 (blue) 5.46*10^4 (blue)
45163 1.05*10^5 (blue) 9.51*10^4 (blue)
45164 1.00*10^5 (blue) 9.52*10^4 (blue)
beacon face LED ID
1 UV (cleaved)
2 UV (cleaved)
3 NSPB 500S
4 CB 30
5 AB 87
6 CB 26
DATA ANALYSIS
• Charge -Time distributions for signal hits OM by OM photoelectron region is considered:
PHOTOELECTRON REGION RUN: 33983
[90, 220] ≡ [F9, F17]
DEAD CHANNEL DEAD CHANNEL
DATA ANALYSIS
• Charge -Time distributions for signal hits OM by OM photoelectron region is considered:
PHOTOELECTRON REGION RUN: 36035
[60, 220] ≡ [F7, F17]
Low efficiency OM (low efficiency cleaning)
Low efficiency OM (low efficiency cleaning)
• 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?
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 CarloReal data
TO CHECK…
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