The Deep Underground Neutrino Experiment

Quality Assurance, Control, and Tracking

Norm BuchananNorm.Buchanan@ColoState.edu

Photon Detector ReviewAug 2-3, 2016

Outline

• Overview• Quality Control • Travelers• Hardware Database• Summary

QC Overview

• Many individual components fabricated/acquired at multiple institutions

• Component quality control will be handled at institution of component origin § SiPMs (NIU)§ SiPM mounting board assemblies* (NIU)§ Bars (uncoated – IU), (coated – FNAL)§ Radiators (IU)§ SSPs and SSP calibration modules (ANL)§ Cables (ANL)§ Calibration components (ANL)

*CSUwillbefabricatingtheboardswhichwillbetestedatNIU

sensL 600035CSiPMs

MountingPCB

RadiatorPlate

WLSLightGuide

SiPM Assembly

PDModule(IUversion)Design

Photon Detector (Module) Quality Control

Photon Detector (Module) Quality Control

UponreceiptofPDcomponentsatCSUtheywillbeunpackedandvisuallyinspected• Appropriateenvironmentalconditionswillbebemaintained(eg.UVfilters)• Trackingandcarefulloggingwillbemaintained– componenttravelerswill

becollectedandaddedtotrackingdocumentsforthecorrespondingPDmodule

• Anycomponentsexhibitingvisibledamageorabnormalitieswillbesetasideandinvestigatedwithresponsibleinstitutiontoensureproceduralproblemscorrected.

OncecomponentshavebeenreceivedandinspectedthePDmodule(s)willbeassembled(seeWarnertalk)

• Testsofmechanicaltoleranceswillbeperformedatthistime(PDswillbeinsertedintotestingframeforthis)

CSU Module Scanner (Warm)

128nmsource

PDinsertiondrawer– holds2PDs

SSPforreadout

Photon Detector (Module) Quality Control

AssembledPDmodulewillthenbeinsertedinto“warm”GAr tester(atCSU)forbasicoperationtesting• PDswillbescanned(inx,y)with128nmsource• TestswillverifySiPM operationandchannelconnectivity

FollowingthewarmscannerteststheassembledmoduleswillbeimmersedinLN2

• PerformedverticallyintheCSU500ltestdewar

• TesttoensureallmechanicalandelectricalconnectionsforthePDmaintainintegritythroughthermalcycle

• OnlyfullPDcryo testpriortoinstallationinprotoDUNE (orfardetector)

• PDswillbereadoutforbasicoperationduringthistest

PD Tests in 500 l (2.5 m) Dewar

Mechanicaltestapparatusformechanicaltestsofupto4PDsinLN2bath

Photon Detector (Module) Quality Control

FollowingcoldtestPDsagaintestedforoperationinwarmscannerpriortoshippingtoCERN.

PDsunpackedandvisuallyinspecteduponarrivalatCERN

• DuplicateversionofwarmscannerwillbeusedatCERN

PDstestedforoperationinwarmscannerpriortoinstallationinAPAs

OncePDsareinstalledinAPAsbasicelectricalcheckswillbemade

Mechanical Tolerance Quality Control

TolerancesbasedonexperiencewithassemblingphotondetectorsandinstallationintotestversionofAPAframe.

• willcheckthatthetoleranceonthewidthandthicknessofthePDiscorrectateachofthe5(MIT)or7(IU)designmountingpoints

• willcheckthatthegapbetweenthemountingpointsiswithintoleranceateachpoint

• willcheck(withanopticaltool)thatthegapbetweentheSiPMs andthelightguideiscorrect

• willchecktheoveralllengthofthePDmoduletomakesureitiswithintolerance

• willcheckthatthespacingofthePDmountrailsisOKbyslidinginablankplatewiththemaximumtoleranceofthePDintotheslotaftertherailsareinstalled

PDmechanicaltoleranceQCplan(uponreceiptofcomponents)

Mechanical Tolerance Quality Control

GoNo-Gogauges(Solidworks models)

QA of SiPM Mounting Board Assembly

12× SiPM

RJ-45Cat6Jack

• Crygoenic teststandhasbeenbuiltforthepurposeofthesetests(LEDandLN2utilized)

Example:qualificationofSiPM mountedonreadoutboard(underthermalcycle)

Sensl SiPM (C-series)solderedontomountingboardassembliesarebeingtestedforoperationthroughseveralthermalcyclesatCSU.

• Capableoftestingupto96SiPMs (8boards)atatime

• SiPM characteristics(gain,cross-talk,darkrate,andafter-pulsing)measuredusingSSPforreadout

• Devicesputthrough5thermalcycles(morethantwicewhattheywillbeexpectedtobecycledthrough

Cryogenic SiPM / Mounting Board Test Stand

• ComputercontrolledsteppermotormovestheboardsintoandoutoftheLN2

TeststandusesLEDinLN2fortests.

• LN2depthismonitoredusingdepthsensorlikethatdevelopedforour500lvessel

• Light-tightcoverputoversystemduringtesting

• Drygaseousnitrogenabovethetestvesseltopreventcondensationandicingontheboardsduringcold-warmcycle.

• Fivecyclestakeabout2days.

Mounting Board Assembly QA Results

Sampleanalysisplotusedtodeterminethedevicegainandcross-talk.

Wewilltestasampleofabout40SiPM assemblyboards(SABs)– eachwith12solderedC-series– throughthermalcycles

CurrentlyfinalizingtestprocedureanddeterminingQCparameters

SiPM testassemblyboard

Tracking and Documenting

• InspectionformsofincomingmaterialswillbecreatedandfilledoutforallPDcomponentssuppliedbyexternalvendorsandinstitutions.

QCRecordkeepingforprotoDUNE willbebasedonexperiencewith35t

• QCrecordforms(suchasthemodelfromthe35Tdetectoronthenextslide)willbefilledoutforeachstepofassembly.

• Allcomponent/moduletravelers/inspectionformswillhavepapercopieswhichtravelwiththeappropriatecomponents,aswellasadigitalversion(includingscanofpaperversion)tobekeptonline.

FinalversionofSiPM mountingboardswillhaveSNsilk-screenedon.Weareusingsharpiefornow

35T PD “Traveler”--QC record sheet for modules

Online Component Database

• Photon detector modules will be tracked in an online database that can be used to link hardware components with performance

• The PD SN will be stored along with its location in the detector§ Talking with DUNE computing leadership (T. Junk et al) about this

• QC values entered into spreadsheet – transferred into component database

QA/QC Documentation

Documentation has been created, and will continue to be created, for the QA/QC testing.

Quality Assurance (Thermal Cycle) Procedure

Conclusions

• A plan for quality control of the PD modules has been developed

• PDs will be tested following assembly at CSU and again at CERN prior to installation into APAs

• Quality Assurance of SiPM/Mounting Assemblies is ongoing

• Tracking plan based on experience with 35 t• Plan for tracking PDs in hardware/online database is

being developed• Procedures are documented as they are implemented