Updates from Ferrara R Calabrese A Cotta Ramusino

Updates from Ferrara R. Calabrese, A. Cotta Ramusino, M. Fiorini, T. Giammaria, M. Guarise, E. Luppi, A. Minotti, L. Tomassetti Tommaso Giammaria DUNE photo-sensor meeting 28/07/2020 You Inst Logo

Content • Recall of last update • Last results on IV curves • Updates on DCR measurements on FBK & HPK Si. PMs • Conclusions 2 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

Content • Recall of last update • Last results on IV curves • Updates on DCR measurements on FBK & HPK Si. PMs • Conclusions 3 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

Recall of last update Si. PM Model IV Room. T IV LN 2 T (1 st cycle) R 00020 6050 HS-LRQ (HPK) R 00021 6050 HS-LRQ (HPK) R 00029 6075 -HX-LRQ (HPK) R 00030 6075 -HX-LRQ (HPK) R 00031 6075 -HX-LRQ (HPK) R 00032 6075 -HX-LRQ (HPK) R 00033 6075 -HX-LRQ (HPK) R 00034 6075 -HX-LRQ (HPK) 11 FBK x 12 FBK x 13 FBK x 16 FBK 17 FBK 18 FBK 4 28/07/2020 IV LN 2 T (20 th cycle) Tommaso Giammaria | DUNE photo-sensor meeting Gain curve Dark noise You Inst Logo

Recall of last update IV characterization for HPK Si. PM at 1 st thermal cycle Si. PM model Units: V R 00020 6050 HS-LRQ R 00021 6050 HS-LRQ R 00029 6075 -HX-LRQ R 00030 6075 -HX-LRQ R 00031 6075 -HX-LRQ R 00032 6075 -HX-LRQ R 00033 6075 -HX-LRQ R 00034 6075 -HX-LRQ Units: kΩ Units: V Units: kΩ Extraction of RQ values in the range [2. 5 V; 4 V] 5 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

Content • Recall of last update • Last results on IV curves • Updates on DCR measurements on FBK & HPK Si. PMs • Conclusions 6 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

New this week • Update on IV characterization before/after thermal cycles - Study on FBK split • Investigation of bursts ongoing - Study of saturating events - Tests with Si. PMs in coincidence 7 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

New this week Si. PM Model IV Room. T IV LN 2 T (1 st cycle) R 00020 6050 HS-LRQ (HPK) R 00021 6050 HS-LRQ (HPK) R 00029 IV LN 2 T (20 th cycle) Gain curve Dark noise (1 st cycle) 6075 -HX-LRQ (HPK) R 00030 6075 -HX-LRQ (HPK) R 00031 6075 -HX-LRQ (HPK) R 00032 6075 -HX-LRQ (HPK) R 00033 6075 -HX-LRQ (HPK) R 00034 6075 -HX-LRQ (HPK) 11 FBK x x 12 FBK x x 13 FBK x 16 FBK 17 FBK 18 FBK x Dark noise (20 th cycle) FBK split arrived on 16/07/2020 8 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

New this week IV characterization for HPK Si. PM at 20 th thermal cycle Si. PM model Units: V R 00030 6075 -HX-LRQ R 00031 6075 -HX-LRQ R 00032 6075 -HX-LRQ R 00033 6075 -HX-LRQ Units: kΩ Extraction of RQ values in the range [2. 5 V; 4 V] 9 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

New this week Comparison of VBD and RQ at 1 st cycle 10 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

New this week Comparison of VBD and RQ at LN 2 temperature for 1 st and 20 th thermal cycle 11 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

Content • Recall of last update • Last results on IV curves • Updates on DCR measurements on FBK & HPK Si. PMs • Conclusions 12 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

Updates on DCR measurements FBK Cryo 13 • • 37300 cells 6 x 6 mm 2 20 th thermal cycle 3000 events First event of every burst is a saturating event 13 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

Updates on DCR measurements FBK Cryo 16 • • 37300 cells 6 x 6 mm 2 2 nd thermal cycle 3000 events First event of every burst is a saturating event 14 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

Updates on DCR measurements FBK Cryo (non DUNE split) • 8 x 12 mm 2 • 1 thermal cycles • 3000 events NO BURSTS! But some saturating events 15 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

Updates on DCR measurements Results of DCR, AP and CT measurements Si. PM OV Total run time Units: V Units: Hz Units: m. Hz/mm 2 Units: % Units: sec FBK 13 4 1. 834 ± 0. 034 50. 94 ± 0. 93 15. 27 ± 0. 71 1. 78 ± 0. 24 1622 FBK 13 5 2. 45 ± 0. 045 67. 96 ± 1. 24 19. 48 ± 0. 80 1. 20 ± 0. 20 1225 FBK 13 6 2. 473 ± 0. 045 68. 68 ± 1. 25 24. 67 ± 0. 90 1. 70 ± 0. 24 1216 FBK 16 4 1. 848 ± 0. 034 51. 34 ± 0. 94 14. 94 ± 0. 71 0. 78 ± 0. 16 1587 FBK 16 5 1. 934 ± 0. 036 53. 72 ± 1. 01 19. 48 ± 0. 82 1. 66 ± 0. 24 1464 FBK 16 6 2. 827 ± 0. 052 78. 52 ± 1. 45 25. 56 ± 0. 92 1. 50 ± 0. 22 1039 Single waveform time-span: 4 us, Fs=1. 25 Gs/s, Trigger=0. 5 p. e. , 3000 waveforms 16 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

Parallel detector test Test with parallel detectors with FBK & HPK Si. PMs • Trigger on one of the Si. PMs • Search for coincidence events 17 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

Parallel detector test Test with parallel detectors with FBK & HPK Si. PMs • Trigger on one of the Si. PMs • Search for coincidence events 18 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

Parallel detector test Test with parallel detectors with FBK & HPK Si. PMs • Non shielded Si. PMs: 5 -8% optical CT between Si. PMs Optical CT 19 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

Parallel detector test Test with parallel detectors with FBK & HPK Si. PMs • Shielded Si. PMs (Teflon + Kapton tape) Optical CT 20 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

Parallel detector test Test with parallel detectors with FBK & HPK Si. PMs Horizontal Shielded Si. PMs Vertical Shielded Si. PMs Optical CT 1 event every more than ≈ 20 min 1 event every ≈ 5 min For BOTH FBK and HPK 21 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo

Conclusion • Burst are present also in our FBK split • NON DUNE FBK Si. PM do not present bursts • Almost ALL bursts are triggered by a high energy event • Nevertheless, some high energy events are not followed by bursts • Coincidences shows strong dependence on the orientation of Si. PMs 22 28/07/2020 Tommaso Giammaria | DUNE photo-sensor meeting You Inst Logo