3x1x1 operations: Status and plans Laura Manenti & Laura Molina Bueno 1
Goal of next two weeks We will have an internal 3x1x1 review on 25th of September The current review committee would be composed of: - Marzio Nessi - Filippo Resnati - Francesco Pietropaolo - Amos Breskin (tbc) or - Leszek Ropelewski (tbc) We need to show where we are, if we have addressed our derivable list and if we have fix or not the issues, such as the grid. Also we need to show how the problems on the 3x1x1 affect the 6x6x6. We have done a preliminary list of the main points that we need to address in the following weeks and a list of tasks. We need a detailed presentation of each part of the 3x1x1 detector performance before the review: • Cryogenic performance: LAr stability and heat load. • Light studies • HV and detector performance • Software and reconstruction of charge data • CRT performance 2
Where we are 1)Stable performance of the detector: → Currently we are limited by the grid performance. → To do list for the following weeks: • Pulsing of the grid • Monitor the current on the grid and on the field cage after the resistor modification • Capacitance measurements between the grid and the LEM to understand where the liquid argon is (See Caspar’s presentation for more details). • Immerse everything: We plan to start tomorrow in steps of 2mm per day, Michel can not fill more in one day as he has to condense the gas. • Setup to test a similar configuration to the 3x1x1 grid HV connection (work in progress) • COMSOL simulations (work in progress) • Garfield simulations (work in progress) 3
Where we are 1)Stable performance of the detector: • On August 26th the new resistor in parallel for the grid was installed. • On August 28th we remove the resistors between the LEMs and the power supply • After these modifications, we started the LEM scan on Tuesday. We run continuously during 4 days since August 29th. 4
Where we are 2)Effective gain and uniformity of the effective gain: → To do list for the following weeks: • Amplification(LEM field) and induction field scan at different extraction fields: 1.5 kV/cm and 2 kV/cm (Needs to be done next week) • Stability and effective gain over time: Quantify the amount of data that we need and define the optimum HV settings to do it • Reconstruction of the runs ongoing to calculate the gain and its uniformity • Garfield and COMSOL simulations 5
Where we are 3)Purity: Preliminary results which we need to cross-check with detailed simulation including all the efficiencies Reconstruction ongoing with the new runs 6 Performed by Laura Z using Qscan
Where we are 3)Systematic check of the quality of the data acquired: • CRT trigger Vs PMT trigger • Offline Combination of CRT and charge data: Work in progress • Hit finding efficiency depending on the HV settings: Work in progress • Noise filetering • Offline combination of PMT and charge data if possible • Updated field maps of the 3x1x1 7
Where we are 3)Systematic check of the quality of the data acquired: • Noise measurements • Run 866 taken 3.08.2017 during pulsing data with PMTs OFF • Run 975 taken on 7.08.2017 during pulsing data, PMTs OFF • Run 980 taken on 28.08.2017 after capacitance measurements and CAEN board changed, PMTs OFF • Run 1015 taken yesterday with PMTs ON and after changing the CAEN board • 1015 8
Where we are 3)Systematic check of the quality of the data acquired: • Noise measurements • Run 866 taken 3.08.2017 during pulsing data with PMTs OFF • Run 975 taken on 7.08.2017 during pulsing data, PMTs OFF • Run 980 taken on 28.08.2017 after capacitance measurements and CAEN board changed, PMTs OFF • Run 1015 taken yesterday with PMTs ON and after changing the CAEN board Run Global RMS 3 m RMS 1m Ratio 3m/ number RMS [adc] view [adc] view [adc] 1m [adc] 866 1,73 2,27 1,54 1,48 975 1,84 2,4 1,65 1,45 980 1,92 2,59 1,70 1,52 1015 2,25 2,75 2,44 1,24 9
Where we are 4)PMT data taking (what is missing): • Increase PMT voltage: A short run 15-20 min with PMTs up to 1500V to check response from the splitter box with extraction field and amplification as in operations • Drift field scan with CRT trigger: from 10 to 60 kV, one hour per run without extraction and amplification-> 6 hours without charge data 10
Plan for the next two weeks Start Filling: First 2mm, Filling Filling Repeat HV test, field scan and capacitance measurements 3x1x1 Op. Meeting 3x1x1 Op. Meeting Final version of presentations 3x1x1 internal review 11
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