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protoDUNE -SP Photon Detector Status

Detailed overview of protoDUNE-SP Photon Detector Modules, Readout Design, Testing, and Status Outline. Includes information on PD Mounting, Readout Block Diagram, SSP, PD Power Supply, Cold Box Integration, Warm Tests, Noise Search, and Noise Remediation.

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protoDUNE -SP Photon Detector Status

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  1. protoDUNE-SP Photon Detector Status Leon Mualem Caltech Feb 20, 2018

  2. protoDUNE-SP Photon Detector • System Description • Modules • Readout • Pre-installationTesting • Integration testing • Readout Design • Status and Schedule Outline

  3. Photon Detector Modules

  4. PDs Mounted in APA Frame 10 PDs per APA Frame PD area 2094mm X 84mm (each) APA Frame area (Outside) 6060mm X 2300mm PD Coverage fraction: ~12.6%

  5. PD Mounting Envelope Frame inside length 2096.8mm 96.83mm wide 16mm tall (Inside) Mounting Frame Inside Dimensions (mm)

  6. Radiator Mounting Plate Detail ~2.5% of PD covered with Radiator support clamps Radiator plate free To slide in clamp Clamp epoxied to Side of WLS bar

  7. PD Insertion in APA Frame • PDs inserted into frame post-wire wrapping • Alternate frame sides to balance frame penetrations and for cable management • Late insertion allows greater control over PD handling and prevents accelerated production schedule cable run in hollow frame PD insertion direction

  8. Readout

  9. SSP (SiPM Signal Processor) Block Diagram

  10. PD Power Supply Status – ANL • First set of Power supplies for ProtoDUNE Integration Tests (Cold Box) were delivered to CERN by Summer 2017 • Wiener product - the MPV8030 and MPV8060 • -0-30V/2.5A, 0-60V/1A 8060 8030

  11. PD Front-End Status – ANL • First SSP prototype was provided for vertical slice test May • Four preproduction SSPs for Cold Box Integration (Cold Box) tests were manufactured and delivered to CERN in July/August • DAQ vertical slice integration successful with a new SSP to be used in the Integration Test (Cold Box) • Integration Test with PD in Cold Box with • APA#1 in October/November • -Full DAQ readout successful • -Noise sources examined and eliminated • Cold Box Integration continued with PDs

  12. Pre-Installation Testing

  13. Integration Testing

  14. Warm Tests • Performed initial readout tests connecting a laptop to readout boards • -Confirmed all channels are connected • -Checked baseline for each channel (no SiPM bias). Found Expected ~3 ADC counts baseline RMS. • -Checked warm SiPM response (with SiPM bias) 27V bias • A typical warm SiPM response has been observed with all 40 photon-detector channels in the “warm” Cold Box Jaroslav Zalesak

  15. Warm Tests – Baseline Data • First tests of photon-readout in the ProtoDUNE “cold box” • - the tests performed in WARM “cold box” • - collected baseline waveforms with SiPMs UNBIASED • - included readout board (SSP), warm cable, signal feedthru, cold cable, • and unbiased SiPM, for each readout channel • Baseline RMS table: • -use SSP 102 as example (SSP102 channels 0 and 1 showed in figures below) SSP 102 example of Baseline Spread: Waveform RMS ch0 = 2.86574 Waveform RMS ch1 = 2.90418 Waveform RMS ch2 = 2.82716 Waveform RMS ch3 = 2.9282 Waveform RMS ch4 = 2.974 Waveform RMS ch5 = 2.93764 Waveform RMS ch6 = 3.02052 Waveform RMS ch7 = 2.9456 Waveform RMS ch8 = 3.10027 Waveform RMS ch9 = 2.82925 Waveform RMS ch10 = 2.92328 Waveform RMS ch11 = 2.83572 (all values are fully consistent with expectation) Jaroslav Zalesak

  16. Warm Tests – Noise Search • Performed tests looking for a noise • Biased one board at the time below break-thru voltage (i.e. 20-25 V) • Found indication of ~250 KHz noise at ~2-6 count level. • However this was studied and understood as the grounding problem • => Noise disappeared with improved grounding scheme Jaroslav Zalesak

  17. SSP 250 kHz issue and its mitigation Seen on all SSPs When Ubias was on (bellow breakdown voltage) Fairly excluded other external sources Internal source

  18. Photon Detector Noise Remediation in the SSP • Connect shield of signal cables directly to analog ground of the board • Shorts out 20 ohm resistance in the ground shield meant to terminate common mode signals from the SiPMs (Not needed – there aren’t any.) • Connect the single-point ground of the SSP board to the chassis near the on-board power regulators • Keeps the ground plane of the board stiff wrt the switching transients produced by the switching regulators on the SSP • Has been shown to eliminate the noise pickup in the SSP readout • Has been vetted and shown to not cause noise pickup in the TPC • Complies with the ProtoDune Grounding & Shielding Plan -G. Drake

  19. Cold Tests – Baseline Data and Noise Search • Scanned all 40 channels at the various SiPM bias values • - used no bias (0V) to test the readout baseline (SSP102 channel 10 at 0V shown in figure below) • Use again SSP 102 as an example SSP 102 Example of Baseline Spread (at 0V): Waveform RMS ch0 = 2.96458 Waveform RMS ch1 = 2.93628 Waveform RMS ch2 = 2.90563 Waveform RMS ch3 = 2.98421 Waveform RMS ch4 = 2.75531 Waveform RMS ch5 = 2.93642 Waveform RMS ch6 = 3.03588 Waveform RMS ch7 = 2.83218 Waveform RMS ch8 = 2.94157 Waveform RMS ch9 = 2.91042 Waveform RMS ch10 = 2.87533 Waveform RMS ch11 = 3.01788 Jaroslav Zalesak

  20. SSP 250 kHz issue – solved, DAQ running

  21. DAQ running all SSPs with different conditions LED OFF 20V, 22V, 23V, 24V 25V, 26V, 27V Data was taken with the Full DAQ → the Photon System reads the data through the DAQ chain of the Cold box.

  22. Module status for protoDUNE-SP • Modules for APAs 1-3 are complete, tested, and installed, including one ARAPUCA • Modules for APA #4 are all at CERN undergoing pre-installation test • Modules for APAs 5 and 6 are in production at CSU – 19 standard modules and one additional ARAPUCA array • Readout boards for APA 5 and 6 • 4 SensL boards in hand • Yield was low due to production change at manufacturer, attempting to produce remainder with Hamamatsu MPPC instead

  23. Readout Status for protoDUNE-SP • First 4 prototypes in place and in production with DAQ on Cold-Box at CERN • Remaining new SSPs in production • Begin delivery in March • Signal Cables delivered • Power cables being assembled • Power supplies All ship by March 15

  24. Conclusions • 4 of 6 module sets for APAs installed or at CERN • Remainder to ship about mid-March • Readout boards for final modules in production this week. • Cables, power supplies, and Front-end electronics in production, expected to be complete by end of March, pre-production modules running since October

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