35-ton Phase-2: Tests in Gas Heng-Ye Liao, Alan Hahn, Sarah Lockwitz 08/03/2017
Channel Map of Ground Planes Instrumentation TOP Bottom N 5 W E 7 1 2 6 S Vertical Beam Plug [Separated Plane] 3 up 8 Segmentation, 8 channels in total ● down 4
Ground Plane: Circuit & Readout Ground Planes [1] instrumentation [0] 4.7 MΩ DAQ 10 V TVS Diodes 39 V MOV 1 MΩ [0]Circuit inside cryo [1]Flexible circuit outside cryo: Limit the input voltages to DAQ p.s. Voltage limit of the NI USB-6211 DAQ: ±10 V
Simplified Electrical Circuit of Ground Planes Instrumentation Ground Planes [1] [2] instrumentation [0] 4.7 MΩ DAQ 10 V TVS R=5.7 kΩ Diodes 39 V MOV 1 MΩ Voltage divider Voltage limit of the ground plane DAQ: ±10 V [0]Circuit inside cryo [1]Circuit outside cryo to limit the input voltage to ±10 V [2]Circuit to reduce the high impedance
PMTs for Phase-II PMT 1 Vertical ground wall N PMT 3 W E PMT 3 Photo from Eileen S PMT 2 PMT 2 PMT 1
Gas Tests ● 7/27: 53 ppm H2O & 10.5 ppm O2 ● 7/28: ? ● 8/1: 42-32 ppm H2O & 1.6 ppm O2 ● 8/2: 41 ppm H20 & 1.2 ppm O2
6 7 8 1 2 3 4 5
Event 1
Event 2
Event 3
Event 4
Event 5
Event 6
Event 7
Event 8
PMT Signals PMT # of ‘Active’ Event Rate Channel Event [cts/min] 1 20 0.11 2 13 0.07 3 592 3.29 *start time: 7/27/14:00:01 *end time: 7/27/16:59.59 *exposure: 179.92 min
Looking for Time Correlations Between Ground Plane Signals & PMT Signals ● 7/28: Scope ch4 → GP ch1 (Top-West) ● 8/1: Scope ch4 → GP ch2 (Bottom) ● 8/2: Scope ch1 → GP ch1 (Top-West) Scope ch4 → GP ch6 (Top-South)
Summary & Outlook ● Ground planes instrumentation is working: We see current draw on the ground planes ● TPB-coated PMT sees more activities ● More tests to come: Enlarge GP signal sizes ● Any ideas are welcome!
Backup
Simplified Electrical Circuit of Ground Planes Instrumentation Ground Planes [1] [2] instrumentation Unity gain op amp 4.7 MΩ DAQ 10 V TVS Diodes 39 V MOV 1 MΩ Voltage of DAQ: ±10 V [1]Circuit to limit the input voltage to ±10 V [2]Circuit to reduce the high impedance
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