Underground PD QC Tes0ng Dave Warner Colorado State University - PowerPoint PPT Presentation

Underground PD QC Tes0ng Dave Warner Colorado State University

Philosophy/Strategy • Basic philosophy— – Don ’ t generate tes0ng as busywork – But learn what you can early to allow you to change problems – Have a plan for what you will do if you find a problem with a test! • Strategy— – Test more extensively early in the installa0on campaign (first few APAs) to look for required improvement to installa0on planning – Reduce (as appropriate) to checkout upon receipt and in final posi0on once installa0on strategy proven 5/19/18 PD Installa0on QC Requirements 2

Descrip0on of QC Tests: • A “Con0nuity check” is a check to the end of the currently installed cable run to ensure the cable is s0ll connected to the module – Needs to be understood in the context of ac0ve ganging • “Opera0onal test” is a check in a dark room or light box to test the con0nued opera0on of the SiPMs (possibly with LED illumina0on?) 5/19/18 PD Installa0on QC Requirements 3

Tes0ng upon Unpacking • Ideally the APAs would be packaged in nearly- light-0ght plas0c wrapping, which would allow us to do a final checkout prior to unpacking from the crate • Perhaps with an LED in the package? • All APAs would have an opera0onal test prior to unpackaging throughout installa0on • Es0mated 0me: 15 to 30 minutes per APA pair • Remedia0on: TBD. Cable checks? Possible replacement of damaged PD (depends on available space) 5/19/18 PD Installa0on QC Requirements 4

Tests upon Hanging Outside Cryostat • Immediately following assembly of upper APA to lower APA, a con0nuity check will be performed for all 20 cables at the top of the APA stack • All assembled APA stacks would have a con0nuity check throughout installa0on • Es0mated 0me: 10 to 15 minutes? • Remedia0on: Re-check cable connec0ons. Possibly separate APA stack to access middle connectors if necessary? 5/19/18 PD Installa0on QC Requirements 5

Ini0al Tes0ng upon Posi0oning Inside Cryostat • Immediately following the APA arriving in posi0on inside the cryostat, but prior to connec0ng the APA- Flange feedthrough cable, a con0nuity check will be performed • This checkout is envisioned early in the installa0on process, and may be eliminated later. • The goal of this checkout is to catch cabling issues caused by the rail installa0on system early enough to allow us to gain access for remedia0on • Es0mated 0me: 20 minutes (?) depending on ease of access • Remedia0on: Move APA stack enough to allow access to cables for repair. Possible other remedia0on as agreed to. 5/19/18 PD Installa0on QC Requirements 6

Full Cable Run Checkout • Following installa0on of APA-Flange feedthrough cable, a con0nuity check will be performed • This check will occur for all PDs as early as possible ader installa0on. • Es0mated 0me: 15 minutes • Remedia0on: Check cable connec0ons. Note issues in database. 5/19/18 PD Installa0on QC Requirements 7

Post-installa0on Opera0onal Test • As soon as possible following installa0on and cable checkout, it would be ideal if the cryostat lights could be turned off and an opera0onal (dark) check performed. • Ideally, this would happen on an stack-by-stack basis in the ini0al installa0on phase, then perhaps on a weekly basis as our understanding evolves? • Es0mated 0me: 1 hour per stack (during off-installa0on- shid 0me) • Test possible involves LED illumina0on? • Remedia0on: Note module status in logbook, try to improve handling procedures to eliminate sources of failures. 5/19/18 PD Installa0on QC Requirements 8

Tooling • A con0nuity check tool will need to be developed to allow for rapid tes0ng. – Mul0-cable simultaneous connec0on? – No twist lock opera0on? – Automa0c test result evalua0on? – Automa0c data storage? • A portable opera0onal tes0ng sta0on should be developed – 4 channel readout? – Automa0c test result evalua0on? – Automa0c data storage? • Aim for opera0on by technicians, not scien0sts. 5/19/18 PD Installa0on QC Requirements 9

Data Storage/Evalua0on • Ideally, the data from all installa0on QC checks would be downloaded to the database automa0cally, no later than at the end of the shid where they were taken. • Data flagged as outside opera0onal norms (TBD) would be automa0cally flagged for expert interven0on • Weekly (?) expert examina0on of QC data from recently installed modules • Performance trend lines maintained (automa0cally?) to look for long-term changes to the system. 5/19/18 PD Installa0on QC Requirements 10

Summary: • While underground remedia0on is difficult, QC tes0ng during installa0on is important to improve procedures and make possible repairs. • Tooling must be developed to allow tes0ng to de made by non-PD experts • Data must be automa0cally stored, and easily retrievable, to be most useful. 5/19/18 PD Installa0on QC Requirements 11