Summary of Run 2A and Plan for Run 2B Shekhar Mishra On Behalf of - PowerPoint PPT Presentation

Summary of Run 2A and Plan for Run 2B Shekhar Mishra On Behalf of ICEBERG (BNL, CSU, Fermilab, LSU, PSL, SLAC, UCI, UK) Neutrino Division, Fermilab DUNE Collaboration Meeting 07/11/2019

Issues with Run 1 • Field Cage: Sparked inducing 50-100 µ Amps current • Condenser: Liquid Argon was bubbling every few seconds • Electrical: Current cross talk • These caused: - ~30 FEMB channels to be dead - ~40% FEMB channels be become unresponsive (cycling warm to cold makes them respond and function !) 2 07/09/2019 Mishra | Summary Run 2A and Plan for Run 2B

Improvement for Run 2A • Field Cage repaired: - Removed POGO Pins - Removed 1 cm of Printed Circuit Board at each corner - Direct wire joint between sides - 1 GOhm resistor only on top and bottom of FC • Condenser: - Stop condenser - Visually inspect bubbles stop - Manual control: Cryostat pressure • Electrical: - Return of FC moved from APA frame to Cryostat Ground - EPICS

Electrical: Noise • Thanks to hard work or Rory and Linda, (you could visit our yesterday’s art work at PAB), we have concluded that - PD detector power system induces noise in CE. This is visible by increase in the low frequency noise in CE, change in the shape of the • Recommendation: PL506 and MPOD are the noise (fft) and overall rise of the baseline design of the DUNE-CE. noise level by up to 5 dB. - To accurately determine the CE noise - CE detector power system induces level, We would like to separate all the noise in PD. This is visible in PD other power being providing from these two units (if possible). measurements (similar analysis), both in amplitude and frequency. • Need and proposed Solutions for PD: - - We have not tested what is the We need a new separate crate and/or power for PD system. effect of other power, we are sharing from CE crates, has on CE - Grounding of these should be clearly electronics. documented and discussed with ICEBERG. 4 07/09/2019 Mishra | Summary Run 2A and Plan for Run 2B

Comparison of CE/PD Noise • TPC in cryostat (06/13/2019) • Changes made to PD CAT6 and Power Supply PD Off PD On • No 800 kHz pickup • 2-5 dB increase at low frequency 5 07/09/2019 Mishra | Summary Run 2A and Plan for Run 2B

Comparison of CE/Purity Monitor Noise • TPC in cryostat (06/17/2019) • No 800 kHz pickup • No increase at low frequency 6 07/09/2019 Mishra | Summary Run 2A and Plan for Run 2B

TPC on in Cryostat G /V Plane X Plane Cathode/FC (10 kV)

Goals for Run 2 • Run 2A Goal: - Physics Goals: a) Study the noise performance of CE and PD after all the changes; • b) Ensure that there is no further damage to CE FEMBs. • • Run 2B Goal: Fully commission ICEBERG (We do not want to switch to SBND type of FEMB without this run) - Physics Goals: - Operate TPC to see tracks, - Study the noise performance of CE and PD; - Ensure that there is no further damage to CE FEMBs.

Schedule of Run 2A • All time below are rough guess and will depend on the availability of technical support staff. (Aria and Mike Z are requested to help coordinate this). - 6/28 Friday morning turn CE power on only (48 Volts) and study if there is any change in CE channel count. till - 6/28 Friday 5:00 PM, Turn off CE and Turn the Condenser on. 7/1 Monday July 1 st turn CE on and run for 1 hour. - - 7/1 Turn on Wire Bias and Run till 8:00 PM. - 7/1 Monday 8:00 PM Turn off Wire Bias and CE, return the cryostat in condenser mode. - 7/2 Tuesday 6:00 AM topped Cryostat. 7/2 Tuesday 10:00 AM July 2 nd Turn on CE, Wire Bias and Cathode - - 7/2 Tuesday 8:00 PM Turn off Wire Bias and CE, return the cryostat in condenser mode. - 7/3 Wednesday 6:00 AM topped Cryostat. 7/3 Wednesday 10:00 AM July 2 nd Turn on CE, Wire Bias and Cathode - - 7/3 Wednesday 8:00 PM Turn off Wire Bias and CE, return the cryostat in condenser mode. - 7/5 Friday 9:00 AM Turn off condenser - 7/5 Friday Study 9:00 AM PD only with no CE and TPC power. (This does not requires top off of the cryostat) - 7/5 Friday 5:00 PM Turn on condenser - 7/8 Monday 6:00 AM Top off Cryostat. - 7/8 -7/10 Top Off and Take Data 24 hours ……….

Run 2A Filling Room Temperature LAr at the 1/3 of Cryostat • Channels became responsive without getting submerged in LAr 10 07/09/2019 Mishra | Summary Run 2A and Plan for Run 2B

Condenser Off: No Bubbles ICEBERG Cryogenic Cryostat Pressure Liquid Level Run 2A Started on June 28th

June 28: Cryostat filled to 61” ICEBERG Cryogenic Cryostat Pressure Liquid Level Pulser 12 07/09/2019 Mishra | Summary Run 2A and Plan for Run 2B

LAr e Lifetime ~55 µ Sec

Wire Bias On Plane Volts nAmps Volts nAmps Volts nAmps Volts nAmps Grid 165 3 335 1 500 1 665 1 U 90 2 180 1 290 1 370 1 X 210 7 410 7 620 8 820 7 X Plane Power Supply has an offset of 5nAmps. That is the current it draws at 0 volts, just power on Cathode V Although much smaller, Cathode still see Grid Current turn on Cathode I 14 07/09/2019 Mishra | Summary Run 2A and Plan for Run 2B

Cathode & Field Cage On • 4+ Hours of CP/FC on • One spike of ~10 nAmps 15 07/09/2019 Mishra | Summary Run 2A and Plan for Run 2B

Tracks 16 07/09/2019 Mishra | Summary Run 2A and Plan for Run 2B

Tracks… 17 07/09/2019 Mishra | Summary Run 2A and Plan for Run 2B

Tracks…

Tracks… There are >30% of the events with tracks, that we stopped looking at them.

Typical Day and Night 20 07/09/2019 Mishra | Summary Run 2A and Plan for Run 2B

Cryogenic Condition at start

1st Run 2095 and 2096, Pulser 0 & 1 CE on 22 07/09/2019 Mishra | Summary Run 2A and Plan for Run 2B

1 st Run 2097, Pulser 4 CE on

Ramp up of all Bias and CP/FC

Cryogenic at Start: No Bubble

1st Run 2101, Pulser 0 & 1 TPC on 26 07/09/2019 Mishra | Summary Run 2A and Plan for Run 2B

1st Run 2103, Pulser 4 TPC on

12+ hours of HV on

TPC on, Runs 2100 and 2200 Runs are taken about every 8 mins and analyzed. 29 07/09/2019 Mishra | Summary Run 2A and Plan for Run 2B

Cryogenic Condition for 13 hours

Run 2255/2259 before/after trip There has been a total of 3 trips of X plane (+ive) power 31 07/09/2019 Mishra | Summary Run 2A and Plan for Run 2B

Channel Counts through 07/10/19 (6:30 AM) No channel has become unresponsive or died in 72 hours of CP/FC on at 15000 Volts. Run 2A Ended

Schedule to start Run 2B • Goals: - Commission all the hardware that goes in the cryostat. - Make TPC work with reasonable lifetime • Plan and Schedule - Start warm up on 7/12/2019 - We will not be pulling TPC out of cryostat. - Inside purifier done (7/19/2019) - Pipe’s for vent line and He supply (7/19/2019) - Install inside purifier in the cryostat. (7/24/2019) - Review and safety approval (7/24/2019) - Start pulling vacuum on the cryostat on (7/26/2019) - Start filling on 7/30/2019 - Purify LAr over the weekend - Start DUNE-CE and PD data on 8/5/2019 (Two weeks later than what was presented on 6/19/2019)

Summary • Run 2A has been successful • PD and CE made improvements on noise studies. • TPC operated at full bias voltage • No further damage to FEMB channels. • While purity was good: Nice tracks