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R&D of Calorimeter using Strip/Block Scintillators with SiPM

Contents 1. Motivation 2. Study on scintillator strips 3. Laser test of SiPM 4. Source test of scinti. strip with SiPM 5. Summary. R&D of Calorimeter using Strip/Block Scintillators with SiPM. H. Miyata, E.P. Jacosalem, S. Iba, N. Nakajima, H. Ono, & A.L. Sanchez

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R&D of Calorimeter using Strip/Block Scintillators with SiPM

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  1. Contents 1. Motivation 2. Study on scintillator strips 3. Laser test ofSiPM 4. Source test ofscinti. strip with SiPM 5. Summary R&D of Calorimeter using Strip/Block Scintillators with SiPM H. Miyata, E.P. Jacosalem, S. Iba, N. Nakajima, H. Ono, & A.L. Sanchez Niigata University For GLD-CAL group Calorimetry and Muons session LCWS05 at Stanford March 19, 2005

  2. Fine segmentation scintillator read out by SiPM 1. Motivation Present design of GLD Calorimeter We might need smaller segmentation Striplet: 10x40x2mmt Study of surface covering • X,Z-layer strip scinti.: 10x200x2mmt • Tile-layer: 40x40x2mmt

  3. 10mm 2.5mm Source point location 2. Scintillator study • Sensor : Strip type scintillator (10mmx2mmt with length: 4,8,12cm) • Surface covering: Black tape, White paint, Teflon wrapped, White+Teflon, Al and Gold evaporation • WLS fiber diameter: 1.0mm (length 13cm, 22cm) • Source : Sr-90 (beta-ray) • PMT (sensor) : 16 Ch MAPMT H6568-10, HV : -950V Setup

  4. Signal Pulse Height White paint: WLS 13cm White paint: WLS 22cm Black sheet: WLS 13cm Black sheet: WLS 22cm pedestal length signal PH vs strip length for different WLS fiber length PH increases as scintillator strip becomes long for White paint covering due to the larger acceptance of reflection lights. PH Strip length

  5. Legend: Al - Aluminum Au - Gold BT - Black Tape T -Teflon WP – White Paint WPT – White Paint with Teflon Pulse height vs surface covering Al • Used Strip type scintillator: 10x40x2mmt, WLS fiber length : 22cm • Compared surface covering effect on the scintillator Black tape, White paint, Teflon wrapped, White+Teflon, Al and Au evaporation White Gold Black White paint +Teflon is the best surface covering

  6. 34x34 =1156 pixels 2mm 2mm A 1.2mm K 1.2mm 3. SiPM study Wire Bonding • Micro Avalanche Photo Diode (APD) with each pixel in Geiger mode • 34x34=1156 pixels in small area(1.2x1.2mm) • Pixel Size : 30x30um • High Gain : ~106 • Operational at low voltage (60~70V) 30um

  7. Setup of laser test Logic YAG Laser & Scan Table System YAG Laser & Scan Table System Wave length & Power: 532 nm (10mJ), 1064 nm (20mJ) Pulse width : < 10nsec Filter: down to 10-8 Precision of laser position: ±2um Trigger : from laser system Output Circuit

  8. Pedestal Signal sigma Bias voltage dependence (532nm) Very low gain for < 65V No saturation up to 68.5V PH Whole sensitive area is covered by Laser Bias

  9. Noise level & S/N (532nm) • Noise level (Pedestal sigma) increases for higher voltages • Best S/N (Pedestal sigma /PH) seems to be achieved around 66.0V ~67.5V Noise level S/N Bias Bias

  10. Laser hitting area (9 pixels) Position dependence of pixel PH • Laser wave length : 1064nm • Sensor bias : 66.5V • 49points (7x7points) were measured • Laser output fluctuation: ~10% or less Central part showed higher PH

  11. Cross sectional view 1 pixel = 5 ADC counts

  12. 4. Source test of scinti. strip with SiPM Setup • Sensor scinti. type: 10x40x2mmt striplet • Surface covering: White paint & Teflon wrapped Striplet

  13. 5mV Sensor Trigger 250ns Pedestal Signal 66.0V PH Comparing ADC counts of laser injection and beta ray signals at same bias voltage (66.5V), the number of photons we observed for beta ray is ~5. Bias

  14. 5. Summary • Scintillator study • White Paint +Teflon is the best surface covering • Longer strip-type with shorter WLS fiber has largest PH • SiPM study • Bias voltage dependence of PH, Noise, S/N were measured. For whole area exposure of 1000 pixels SiPM with 532nm laser light, good operation voltage span was ~1.5V. • Central region of SiPM showed higher PH. Need to check more SiPMs. • Beta ray signal from scintillator strip with SiPM • Signal was observed for 10x40x2mmt striplet • Number of photons: ~5

  15. 予備

  16. PH vs Block Type Scintillator Thickness • Compare the PH vs thickness • 5mm thick scintillator had greater PH

  17. Photon number of scintillator and SiPM measurements • Position distribution(1064nm) • Laser insert into 9 pixels • Saturation occurred -> 9 photons yielded • 66.5V : PH=47 (ADC count) • 5.2 (ADC count) / 1 photon • Connection scintillator and SiPM • 66.5V : PH=31 (ADC count) • ~6 photon yielded 5 ADC count

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