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Published byAshlee Rogers Modified about 1 year ago

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New test result of MPPC M.Taguchi(kyoto)

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Contents New MPPC sample Noise rate,gain,crosstalk rate PDE Long term stability

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New MPPC sample recently we got HPK32(400pixel) ×3 Operating voltage : 68~69V 1p.e signal width:~20ns HPK53(100pixel) ×3 Operating voltage:68~69V 1p.e signal width:~50ns HPK say these have higher PDE than old samples The test result of HPK14(100pixel) that we used at beamtest will be presented for comparison

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Noise rate measurement 15 ℃ 20 ℃ 25 ℃ ■ 0.5p.e threshold ▲ 1.5p.e threshold 1MHz 100kHz 68.4 69.6 69.4 15 ℃ 20 ℃ 25 ℃ Bias voltage HPK32(400pixel) HPK53(100pixel)

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Gain measurement@T=20 ℃ HPK53(100pixel) HPK32(100pixel) 1×10 6 3×10 6 1MHz 500 kHz gain 0.5p.e threshold noise rate HPK14(100pixel) Gain of new samples >10 5,so satisfy T2K requirement

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Crosstalk rate measurement@T=20 ℃ 0.5p.e threshold noise rate 1MHz 500 kHz 0.2 Cross talk rate HPK53(100pixel) HPK14(100pixel) HPK32(100pixel) 0.1 Crosstalk rate of new samples is still high (T2K requires crosstalk rate<0.1)

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PDE measurement@T=15 ℃ MPPC ½inch PMT scan 1mmφslit MPPC ½inchPMT scan 1mmφfiber Blue LED 1mmφfiber With this set up all the light going through 1mmφslit inject to the active area of MPPC With this set up some light from a fiber don`t reach to the active area of MPPC because there is a distance(~0.8mm) between surface cover and active area Ratio of MPPC p.e to PMT p.e measured by this set up is defined as PDE Ratio of MPPC p.e to PMT p.e measured by this set up is defined as effective PDE

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PDE measurement@T=15° ▲ PDE Noise rate(kHz) ノイズレート (kHz) PDE is showed with relative value to PMT 90 0 500 2 HPK53(100pixel) HPK32(400pixel) HPK14(100pixel) 900500 900 550 400900 Noise rate(kHz) 2 1 ■ effective PDE PDE of new sample is 2 times larger than that of old one Effective PDE is 50~60% of PDE We requested the improvement of MPPC packaging to HPK

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Raw signal of new sample HPK53(100pixel) Noiserate=1345kHz HPK32(400pixel) Noiserate=1246kHz Noise with large pulse height ( ～ 10p.e) is observed when noise rate becomes >1MHz There is no problem because T2K requires noise rate <1MHz

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Long term stability test@T=20 ℃ 4 layers ½ inch PMT HPK32(400pixel) Cosmic ray Bias voltage68.8V gain5.6×10 5 0.5p.e th noiserate800kHz Crosstalk rate0.1 Effective PDE(including crosstalk) 1.2 Trigger counter Cosmic trigger LED trigger(for monitaring MPPC gain) Pedestal trigger(for monitaring noise rate) Blue LED Test the stability of gain,noise rate,p.e for MIP MPPC parameter 3 different triggers

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Cosmic ray event MPPC PMT 20 p.e 60 14.8p.e 16.2p.e

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gain 5% RMS/mean=2.5 % 5% 40hour 40hour Noise rate 5.7×1 0 5 839 kHz Stability of MPPC gain and noiserate RMS/mean=4.3 %

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Peak adc count for MIP 5% Peak adc count/gain for MIP 5% Stability of MPPC Light yield for MIP RMS/mean=4.0%RMS/mean=2.9% 14.7 p.e 40hour 40hour Correction by gain

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summary New MPPC samples have about 2 times larger PDE than that of old ones MPPC light yield for MIP~15p.e (at the point where noise rate and gain satisfy T2K requirement) Gain stability ~3%,noise rate stability~4% Stability of light yield for MIP~3% (about 2 days)

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Back up

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LED event MPPC PMT

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Staibility of PMT gain 5% 40hour RMS/mean = 4.7% 1p.e adc count

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5% 40hour Peak adc count for MIP Peak adc count/gain for MIP 5% 16.5 p.e Stability of PMT light yield for MIP 40hour RMS/mean=4.6%RMS/mean=3.1% Correction by gain

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Operating voltage range which satisfy T2K requirement HPK32(400pixel) 68.2 ～ 68.8V Upper limit ： 1.5p.e th noise rate<50kHz Lower limit ： PDE >15% HPK53(100pixel) 68.3 ～ 69.1V Upper limit ： 1.5p.eth noise rate<50kHz Lower limit ： PDE>15%

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Recovery time HPK32 (400pixel) LED1 LED2 Fire all pixels with LED1 and study the response of LED2 with the delay to LED1 LED1 LED2 120ns Saturation signal was observed by LED2 even with the 120ns(signal width) delay 400p.e recovery time is about the same as signal width LED1LED2 160ns 400p.e

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