3x1x1 operations: Status and plans Laura Manenti & Laura Molina - - PowerPoint PPT Presentation

3x1x1 operations: Status and plans

Laura Manenti & Laura Molina Bueno

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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 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

• f 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

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.

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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)

Where we are

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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.

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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

Where we are

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3)Purity: Preliminary results which we need to cross-check with detailed simulation including all the efficiencies Reconstruction ongoing with the new runs Performed by Laura Z using Qscan

Where we are

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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

Where we are

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3)Systematic check of the quality of the data acquired:

• Noise measurements

Where we are

• 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

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3)Systematic check of the quality of the data acquired:

• Noise measurements

Where we are

• 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 number Global RMS [adc] RMS 3 m view [adc] RMS 1m view [adc] Ratio 3m/ 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

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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

• perations
• Drift field scan with CRT trigger: from 10 to 60 kV, one hour per run without

extraction and amplification-> 6 hours without charge data

Where we are

3x1x1 internal review

Final version of presentations

3x1x1 Op. Meeting 3x1x1 Op. Meeting

Start Filling: First 2mm, Filling Filling

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Plan for the next two weeks

Repeat HV test, field scan and capacitance measurements