Study of the MPPC for the GLD Calorimeter readout Satoru Uozumi (Shinshu University) Feb 3-8 2007 Beijing Introduction Basic performances Future.

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Presentation transcript:

Study of the MPPC for the GLD Calorimeter readout Satoru Uozumi (Shinshu University) Feb Beijing Introduction Basic performances Future improvements Summary

Sampling calorimeter with Pb/W - scintillator sandwich structure with WLSF readout Particle Flow Algorithm (PFA) needs particle separation in the calorimeter Fine granularity with strip/tile scintillator Huge number of readout channels –~10M (ECAL) + 4M (HCAL) ! –10K for muon detector Used inside 3 Tesla solenoid Need a new photon sensor which is compact and low-cost, and has enough performance. The GLD Calorimeter

~ 1 mm Depletion region ~ 2  m Substrate substrate p + p-p- Guard ring n - Al conductor p+p+ n+n+ Si Resistor V bias The Multi Pixel Photon Counter (MPPC) - A novel semiconductor photon sensor pixel MPPC

Excellent photon counting ability 0,1,2,3,4,5,6,7,... Photoelectrons ! 1 photoelectron 2 photoelectrons 4 mm 1.3 mm Side 3 mm Front

PhotomultiplierMPPC Gain~ ~10 6 Photon Detection Eff.0.1 ~ 0.2~0.2 for 1600 pix. MPPC Responsefast Photon countingYesGreat Bias voltage~ 1000 V~ 70 V SizeSmallCompact B fieldSensitiveInsensitive CostVery expensive !Not very expensive Dynamic rangeGoodDetermined by # of pixels Long-term StabilityGoodUnknown Robustnessdecent Unknown, presumably good Noise (fake signal by thermions) QuietNoisy (order of 100 kHz) The MPPC has lots of advantages The MPPC is a promising photon sensor, and feasible for the GLD Calorimeter readout !

Basic performance Gain and its variation over 400 MPPCs Dark Noise Rate Cross-talk Photon Detection Efficiency

30 o C 25 o C 20 o C 15 o C 10 o C 0 o C -20 o C –C … Pixel capacity –V 0 … Breakdown voltage d Pedestal 1 p.e. 2 p.e. 3 p.e. 400 pixel with x63 amp LEDMPPC The MPPC Gain Over-voltage

Breakdown voltage Number of samples 400 MPPCs have been delivered for a coming ECAL beamtest, and we have measured all of them. Obserbed variation of breakdown voltage is small enough and acceptable. Variation of C and V 0 over 400 MPPCs RMS ~ 0.4 V Measured at 15 o C Pixel capacity RMS ~ 3%

Rate of Dark Noise Dark noise : Avalanche signal caused by thermal electrons 30 o C 25 o C 20 o C 15 o C 10 o C 0 o C -20 o C Threshold 0.5 p.e. 0.5 p.e. Threshold Dark noise rate increases with over-voltage. It is also affected by temperature. Typical noise rate is order of 100 kHz with 1600 pixel MPPC.

Cross-talk The inter-pixel cross-talk to adjacent pixels is caused by photons created in an avalanche. Method to measure: 2 pixels fired signals in dark noise is caused by the cross- talk effect. Cross-talk prob. increases with over-voltage, but not affected by temperature. 30 o C 25 o C 20 o C 15 o C 10 o C 0 o C -20 o C

Photon Detection Efficiency (P.D.E) Q.E. : Probability of electron-hole production by single photon  Geiger : Probability that a photoelectron induces an avalanche  geom : Fraction of sensitive region in a sensor ( Geometrical Efficiency) Measurement method Inject same light pulse into both MPPC and PMT, and compare light yield measurede by MPPC and PMT. MPPC 0.5 mm  Pin-hole PMT LED WLSF ~ 16 %

Photon Detection Efficiency P.D.E of the MPPC is ~20%, which is comparable to PMT (for 1600 pixel). Dominant uncertainty comes from uncertainty of PMT’s 25 o C

So the MPPC is satisfactory for the GLD calorimeter readout? Gain: ~ at least 10 5 Dynamic range: satisfactory to measure EM shower maximum – need ~5000 pixels Photon Detection Efficiency should be comparable to PMT to distinguish MIP signal Noise rate : < 1 MHz (threshold = 0.5 or 1.5 p.e) Small package suitable to attach to the scintillator strips good uniformity, small cross-talk Timing Resolution ~ 1 nsec – Necessary for bunch ID, slow neutron separation Should be stable against bias voltage / temperature / time Price ! Requirements for the GLDCAL readout The MPPC is feasible for the GLD calorimeter, but still need more improvements.

Improvement is ongoing We are improving the MPPC collaborating with Hamamatsu photonics. Evaluate performance of the MPPC prototypes Provide feedback, requirements and suggestions to HPK Improved samples from HPK We are still improving performance of the MPPC. In some future we will have the MPPC with sufficient performance for our requirements.

If you are interested in the MPPC … Yes, now you can buy it ! Number of pixels Sensor size1 x 1 mm 2 Nominal Bias Volt V77 10 V Gain (x 10 5 ) Noise Rate (kHz) Photon Detection Efficiency 65 %50 %25 % Temperature dependence (  V 0 /  T) 50 mV / o C Hamamatsu is starting to deliver the MPPC. See following page for more information: 0_26.html (Numbers from HPK catalog)

Summary The Multi Pixel Photon Counter is a new and promising photon sensor. It has many advantages comparing with photomultiplier and suitable for the GLD calorimeter readout. However there are still some points necessary to be improved (dynamic range, temperature dependence, etc..) We are improving these points with Hamamatsu photonics and we will have a sufficient performance in future. Plans Perform a ECAL beam test with full MPPC readout (  next talk). After the beam test, we will study robustness, long-term stability, radiation hardness, magnetic field tolerance, timing resolution. Of course we will continue to improve the MPPC performance collaborating with Hamamatsu.

Backups

Over voltage (Vbias-V 0 ) Noise rate (Hz) Cross-talk probability

Temperature dependence of V 0  V 0 /  T = (56.0 ± 0.1) mV/ o C

KEK Detector Technology Project Photon Sensor Group ( (KEK, Kobe, Kyoto, Nagoya, Nara-WU, NDA, Shinshu, Tokyo/ICEPP, Tsukuba) Develop and study the MPPC with Hamamatsu Aiming to have satisfactory performance to use at : –GLD calorimeter –T2K near detector –Belle Aerogel Cerenkov Counter Provide important feedbacks to Hamamatsu for improvement of fundamental properties

Noise rate (kHz ) Cross-talk probability Bias voltage (V) Cross-talk = NR(>1.5p.e.) NR(>0.5p.e.) >0.5 p.e. >1.5 p.e. Noise Rate, Cross-talk

MPPC mass measurement Shaper & Amp MPPC board ADC Bias voltage source Thermostatic chamber (kept at 15 o C) Blue LED DiscriScaler MPPC

Noise rate (kHz) Cross-talk probability Error bars mean variation (RMS) over 400 MPPCs 39% 27% 23% 21% 23% 30% RMS/Mean=60% 70% 48% 59% 63% 58% 47% RMS/Mean=27% Variation of Noise Rate, Cross talk over 400 MPPCs Bias voltage (V)

Photon Detection Efficiency by Hamamatsu

1600 pixel Response curve (simulation) Light input (photoelectrons) The MPPC is a non-linear device. One pixel can count only one photon, even if there are 2 or more photons injected. Need to increase number of pixels to improve the dynamic range. (currently 1600 pixels is maximum) About 5000 pixels is necessary to measure high energy electromagnetic shower maximum Need More Dynamic Range !

The MPPC is drastically evolving … Mar ● 100/400 pixels ● First sample from Hamamatsu Jan ● 100/400/1600 pixels ● Smaller pixel size results in more number of pixels Oct ● 100/400/1600 pixels commercialized ● Improved Gain and dark noise Sometime in future ● Larger sensor area ● More number of pixels ● And perhaps more… ?