S-2S MEMO Toshiyuki Gogami 17 May 2015. Contents Analysis results of WC test.

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Presentation transcript:

S-2S MEMO Toshiyuki Gogami 17 May 2015

Contents Analysis results of WC test

Experimental setup Gravity SIDE VIEW PMT(H UV) y z x Plastic scintillator (TOF1) Plastic scintillator (TOF2)

Pictures of WC at room.319 in Kyoto Univ.

Run summary 2s/doc/wctest2015/RunSummary_wctest2015.pdf

Analysis

NPE calibration using LED Obtain ADC channels per NPE Fluctuate from time to time due to: Fitting results Performance fluctuations of electric circuit and PMT etc.

Ensemble of calibration data Run ID: 3, 5, 7, 9, 11, 13, 15, 17, 18, 20 and 21 Filled fitting results of each calibration run.

Ensemble of calibration data Run ID: 3, 5, 7, 9, 11, 13, 15, 17, 18, 20 and 21 Used for a conversion from ADC ch to NPE Systematic error: 0.25 / 6.84 for WC / for WC2

NPE derivation from NPE histograms Used function: Single Gaussian function 1.Scan a fitting range to minimize the fitting chi-square 2.Obtain the mean value  Used as a result

A typical NPE histogram with a fitting result Run37 for y=0 cm

Data phase  Phase 1 (4/21 – 4/25)  Phase 2 (5/11 – )

NPE comparison between Phase1 and Phase2 at y=0

PHASE 1 PHASE 2 Reducing ?  will keep taking data more.

y-dependence for Phase 1 and 2 Phase 1Phase 2 consistent with the errors. Tendency is

y-dependence for Phase 1 and 2 Phase 1Phase 2 consistent with the errors. At y = 0 cm, (PMT1, PMT2, Sum ) = (77.8±0.3, 99.0±0.4, 176.5±0.7) At y = 0 cm, (PMT1, PMT2, Sum ) = (68.0±0.5, 86.3±0.6, 154.0±0.7) Tendency is

Summary NPE is reducing… The reduction may be caused by water deterioration due to caulking material (Bathcaulk-N). Further studies will be done !!