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Monitoring system for the HCAL prototype

Monitoring system for the HCAL prototype. Preparation of the test beam for HCAL LED monitoring system - monitor stability of tile-fiber system + SiPM - cover the dynamic range of data taking maybe monitor the saturation of SiPM Temperature monitoring system.

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Monitoring system for the HCAL prototype

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  1. Monitoring system for the HCAL prototype • Preparation of the test beam for HCAL • LED monitoring system • - monitor stability of tile-fiber system + SiPM • - cover the dynamic range of data taking • maybe monitor the saturation of SiPM • Temperature monitoring system Erika Garutti

  2. Requests for LED monitoring system Monitoring: stability of MIP calibration  during run, in between spills, 1Hz measurement low gain, MIP-like LED light  need to take 2 pedestals: one for LED (in between spills) one for data (during spills) Calibration: determination of SiPM gain  at the beginning of every run, 100Hz measurement ~10k events, high gain, low LED light (single pe) ~10k events, high gain, MIP-like LED ~10k events, low gain, MIP-like LED Monitoring: saturation curve parameters  daily/weekly ~10k events x 5 points, high gain, min-3MIP LED light ~10k events x 20 points, low gain, ½ MIP-max LED light ~5 min ~30 min Erika Garutti

  3. SiPM readout cards 18 clear fiber 10 - 100 cm Photodiode monitoring fiber UV-LED Photodiode LED monitor design 18 pairs LED+Photodiode • Present status of design • LED + PD board easy to exchange • Light-tight connection of the board l on cassette frame • Connections: • 1 LED voltage supply ~ 30-60V • 1 Photodiode voltage supply • 1 PD-preamp V supply • 1 Trigger input (NIM, neg.) • 18 signal outputs from the PDs, pos., ~ 500 ns shape • 1-2 Temp. sensors on board Erika Garutti

  4. LED choice: Blue vs UV UV LED: to monitor scintillator + WLS fiber + SiPM - several types tested - best one 30% above the others - small LY spread over many fibers ±15% - all of them very slow: ~20ns to max LY  NEW LED from NIU ~30% more LY Blue LED: monitor only WLS fiber + SiPM - slightly less LY than UV (~20 %) when shining on tile LED from: www.roithner-laser.com and www.led-shop24.de Best choice UV LED: LED405-02V (405 nm, 10mV @ 20mA, 12o) Erika Garutti

  5. Status of LED monitoring system • Chosen LED monitoring setup: 1 LED + 20 clear fibers + 1 PD  • 18 tiles monitored by each LED • Fiber inserted in a 0.5cm hole on the G10 board, fixed with reflector foil • Max LY achieved with our best LED & 0.5mm Luminous fiber  60 MIP • Improvements: •  0.75mm Luminous fiber ~ factor 2 •  new LED from NIU ~ factor 30% (3mm Ø, 30o,UV) • Still to check (on LED side): • > LY spread form new LED (smaller diameter) • > LY spread on new mock-up • > UV light attenuation on clear fiber • > ageing of clear fiber with UV light • > comparison of LED signal to MIP signal Erika Garutti

  6. Test setup 30 fibers,  0.5 mm UV LED LY spread on bundle output ±15% 0-11 V, 20ns pulse 100 Hz  LED signal rise time ~ MIP rise time MIP : rise 11 ns fall 46 ns LED : rise 11 ns fall 45 ns Erika Garutti

  7. Driving & monitoring the LED -LED pulser: -LY @ 30V with Petr pulser = LY @ 11V on standard pulser -saturation of LED light @ 30 V in Petr pulser  is 60 V needed? -LED frequency: -during beam data taking  1 Hz -during special calibration  100Hz -PIN diode signal (with present preamp): -rise ~50ns, fall ~80ns -noise ~factor 10 larger than SiPM noise -S/N ~factor 2-3 larger than PM Erika Garutti

  8. More about the system stability -long term LED stability checked (~1 month of data analyzed by Evgeni) -often jumps observed in LED LY -after correction stability of ~1% for SiPM (~3% on APD dominated by noise) APD/PD APD PD Erika Garutti ~15days

  9. Temperature stability Warm up LED directly Warm up LED in water Preliminary check 27oC? oC 26oC41oC Consistent response of PM and PIN diode Direct warm up is too fast and T cannot be controlled  LED variation < 0.5% / oC Erika Garutti

  10. LED Stability in the lab Almost stable temperature over ~15h Study the spectral changes of LED light emission ~2% deviation of PM and PD measurement can be related to sensitivity to different light spectra  maybe use WLS-fiber to connect PD ? PM PD First look Erika Garutti

  11. LED/SiPM cross talk • measured SiPM signal with LED off • compared to LED on but light screened • 0.25pC cross talk on SiPM with LED at < 1cm distance • (MIP ~10mV ~2.5pC) LED off LED ~ MIP max LED LY Peak to peak 2.8 mV 5.8 mV Erika Garutti

  12. SiPM saturation curve • Response function of SiPM obtained with 3 LED fibers perpendicular to the tile • good reproducibility • good agreement with saturation curve with: Npixel =1500 , geom. eff. = 0.12 , xtalk = 0.15 [a.u.] Erika Garutti

  13. Temperature monitoring • Platinum resistors • interpolate 5 readout points • 2 r/o on LED board • 2 r/o on mother board • Total > 300 readout signals • Multiplexed r/o Project in collaboration between Prague-DESY Erika Garutti

  14. MUX(MC14051) PT100n PT1001 PT1002 IB IL TEMP 2 RTD-PAC + CAN-bus IL CAN BK-TC-PAC Temperature monitoring(scalable system) no time constrain all ch. can be multiplexed AD590 Current RO Erika Garutti from Sven Karstensen + Milan

  15. Slow control schematic Temperaturemonitoring(Phoenix contact) Motor control and monitoring(Siemens S7) Power Supply control and monitoring(W-ie-ne-r) CAN-bus CAN-bus Linux PCwith PVSS TCPIP Connection to the world:ORACLE, ODBC, TCPIP, HTTP, WAP Erika Garutti from Sven Karstensen

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