ProtoDUNE SP CPA and FC ProtoDUNE SP CPA and FC QA/QC Plan QA/QC - - PowerPoint PPT Presentation

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ProtoDUNE SP CPA and FC ProtoDUNE SP CPA and FC QA/QC Plan QA/QC Plan

Jonathan Asaadi University of Texas Arlington

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Overview Overview

• This talk is meant to convey some of the

lessons learned from MicroBooNE and LArIAT

• This is also trying to outline various checks,

tests, controls, and assurances that should be in place

– Many of these tests are planned / being done / will

be done during installation

– Not a fully exhaustive list and will likely need to be

expanded as different aspects of the detector come into sharper focus

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Component Tests/Procedure Notes

Large metal components for the field cage and cathode Soaking bath and rinse to remove grease and large pieces of F.O.D. Requires a place large enough to allow for cleaning and drying

• f components prior to

assembly Drilled holes in all components Identifying and removing metal shavings, burrs, Need to check any internal components of large machined parts Small component (elbows, screws, etc) cleaning Ultra sonic bath soak Need to keep track of which components go where and repackaging after cleaning

QA/QC related to cleanliness QA/QC related to cleanliness

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QA/QC related to cleanliness QA/QC related to cleanliness

• The various components of the cathode

and field cage will come in many pieces

– Rolled form field cage tubes – G10 I beams – Plastic Caps – etc…

• Assuring these pieces meet cleanliness

requirements before assembly is important

– For MicroBooNE and LArIAT this required having

access to series of ultra-sonic baths for small components

– Larger soaking baths (simple green cleaning

solution) for large metal pieces (field cage rings)

– Checking for metal burs, foreign object debris,

and grease before moving the parts to

Soaking bath for MicroBooNE Soaking bath for MicroBooNE Field Cage Tubes Field Cage Tubes

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QA/QC related to cleanliness QA/QC related to cleanliness

MicroBooNE DocDB 2259 can be made available to help

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QA/QC related to components QA/QC related to components

Component Tests/Procedure Notes

Threaded components Application of anti-galling coating MicroBooNE used moly-coat sprayed on all bolts Interferences between mating components Ensuring the correct bolt/nut/washer is installed in the correct place There are often many very similar components and the need to have them (re)labeled following cleaning / coating and cataloged is important Identifying correct bolt head types Need E-Field studies for various types to minimize potential source for breakdown

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QA/QC related to components QA/QC related to components

• The need for cleaning of bolts

(applying anti-galling material),

• rganizing bolts / head types is

important

– We had quite a few examples of

bolts galling without moly-coat

– Need to be careful of which bolts

(size and head type) apply

• Need a comprehensive list of

all the bolts prior to installation

– Will help with vendor availability – All the parts need to be cleaned,

coated, and cataloged for installation….so knowing what they are in advance helps

Application of moly-coat to Application of moly-coat to MicroBooNE screws MicroBooNE screws E-field study for different E-field study for different bolt head components bolt head components

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QA/QC related to components QA/QC related to components

• Following the cleaning and

coating of all the small components, making sure they are identified and cataloged for use during installation is and important control to have in place

– On MicroBooNE and LArIAT we had a

few instances where similar enough looking components were installed in the wrong place

– These were caught during later test

fits, but a better control system could have prevented this

• For something as large as

(proto)DUNE and being built in different places, this a system of checks should be in place early

MicroBooNE TPC during MicroBooNE TPC during installation with very tight installation with very tight clearances clearances Similar enough bolt initially Similar enough bolt initially installed in the wrong position installed in the wrong position

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QA/QC related to cathode QA/QC related to cathode

Component Tests/Procedure Notes

Flatness of assembled cathode Survey test done during construction and following installation This can be a time consuming process, but can be an essential driver of the physics so needs to be accounted for Electrical connectivity between cathode components Resistive measurement (or possibly small current measurement) The application of resistive coating will likely require a bit more thought to verify electrical connection Tests of high voltage bus Stand-alone high voltage tests Assembled and installed cryo- tests The details of this component still remain a bit less clear to me...so the details of the tesing here are not thought out yet

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QA/QC related to cathode QA/QC related to cathode

• The MicroBooNE cathode was a similar

construction (panels and tubes)

• Ensuring hole patterns (or maybe slot

locations) line up for protoDUNE’s much larger structure will make installation easier

• Alignment measurements take time to do

and should build in sufficient weeks for an iterative align/measure/shim/repeat

MicroBooNE achieved a cathode flatness of MicroBooNE achieved a cathode flatness of +/- 6 mm over the 10.3 meter length +/- 6 mm over the 10.3 meter length

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QA/QC related to cathode QA/QC related to cathode

• Testing of both the

mechanical and electrical performance of the HV-Bus should be done prior to installation

– These tests are likely best both

warm and cold

• Following installation, the

verification of the HV-bus will need to be considered in the QA/QC plan

– Likely as part of the overall CPA

checkout post installation

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QA/QC for resistor divider boards QA/QC for resistor divider boards

Component Tests/Procedure Notes

Test of individual resistor and varistor components High voltage tests to verify behavior and function Tests should be done warm and cold and results should be cataloged by components Matching components to ensure correct tube-to-tube resistance Resistive measurement (or possibly small current measurement) Test should be done warm and cold Resistors and varistor tests Spark tests and clamping behavior Done for MicroBooNE and LArIAT in the cold...but this was more for safety reasons Testing of the PCB board Destructive HV tests as well as baseline HV performance tests We found problems with the boards in LArIAT and had to go to directly soldering components onto the field cage

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QA/QC for resistor divider boards QA/QC for resistor divider boards

• For MicroBooNE and

LArIAT we built a rig to perform QC tests of the resistors at 100% of their

• perating voltages in the

cold (open air argon dewar)

– A similar rig was used for

destructive tests because we could force the potential to ground quickly (simulating a spark condition)

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• The “Lighting Wheel”

was a rig that Hans Jostlein built for us that allowed us to give ~2 Joule sparks to resistor and varistor components in the cold as well as test their clamping voltage and resistance after the application of sparking

• Allowed us to pick out

varistors and resistors which performed the best following the tests

MicroBooNE DocDB 3397 provides details of the tests performed

QA/QC for resistor divider boards QA/QC for resistor divider boards

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QA/QC during initial assembly QA/QC during initial assembly

Component Tests/Procedure Notes

Mechanical test fits to look for interferences High voltage tests to verify behavior and function This assumes the cryostat is ready before the detector is complete….but could be done before actual installation if the schedule allows Verify electrical conductivity of the cathode High voltage tests to verify behavior and function (Need to think how the resistive coating complicates this measurement) Verify the resistor divider network Apply ~1 kV to the cathode in incremental steps and check the current is as expected as well as verify the voltage near the APA

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QA/QC during initial assembly QA/QC during initial assembly

• In MicroBooNE and LArIAT we

did a number of “mock” installations and dry runs

– TPC test fits – Electronics and PMT mounting

using mechanical spares

– Cable routing and interference

testing

• Allowed to catch problems

early and anticipate changes to installation plans before the actual detector was ready to go

• The same extent of tests may

not be possible for protoDUNE, but should be considered

Mechanical fit tests done with Mechanical fit tests done with “dummy” motherboards on LArIAT “dummy” motherboards on LArIAT

TPC test fits and moch cable routing done TPC test fits and moch cable routing done with MicroBooNE and LArIAT with MicroBooNE and LArIAT

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• Once the cathode / field cage

and APA’s are installed, the electrical network should be verified

– Testing the current seen when

~1kV is applied to the cathode

• “Did we connect everything

correctly?”

– Measuring the impedance

between the field cage and the cryostat

– Measuring the capacitance in the

RC network setup by the field cage

QA/QC during initial assembly QA/QC during initial assembly

MicroBooNE 1kV MicroBooNE 1kV test of the field test of the field cage network post cage network post installation installation

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• This list here is by no means exhaustive

– Instead meant to help during the planning stage based on

previous experience building and installing LArTPC’s

• Many of the tests mentioned here have complete

testing documents that were done for MicroBooNE

– I am happy to help in the transformation of these

documents into ones for protoDUNE as well as work with

• thers in the development of new testing procedures for the

new components

• E.g. Beam plug, HV-Bus, etc….
• Thinking through these things now does make the

process go faster

– New things will pop up during installation, but if you’ve

already covered the ones you know about, the new ones become easier to handle.

Parting thoughts Parting thoughts