Stave Core QA ITK Week William Heidorn Stave

Stave Core QA: ITK Week William Heidorn Stave Core QA Weekly Meeting February 7, 2019

Summary Went to CERN last week to attend ITk Week and get started on the transition to moving to Europe Met with Graham Beck from Queen Mary(QM) to discuss thermal system Attended many meetings about the current status of the Itk project https: //indico. cern. ch/event/728933 Presented Thermal Shock results William Heidorn February 7, 2019 1

Meetings with Graham Beck Discussed thermal enclosure Currently QM has all of the major components: Chiller (Different), Booster Pump (Same), Camera (Same) Worried that he has to do the piping himself Related my enclosure and setup experiences: Ground loops, System Assembly, Yale procedure Hopefully will have it done in a few months (Gave no clear date, but this seems to be on the top of his priorities) Stave 2: We might not get it back until after they have looked at it with their completed system, but if we want it back asap we can ask. Showed him our Twiki for both experiments Needs Updating: I recently updated the software one for thermal but the laser scanning one should be too William Heidorn February 7, 2019 2

Mini-Staves for Wire Bondability & Reliability: Tony Weidberg Made mini-staves with different structural builds Began structural tests by dipping them in liquid nitrogen, but no results were given just a path forward requiring more discussion If dip results are good. No need for high granularity tests- simple tap test… If dip results are bad. Consider using of ultrasonic bond tester… If somewhere in between… More discussions William Heidorn February 7, 2019 3

Adhesive Bond Integrity Testing of ATLAS Stave Cores: Will Emmet Discussed four different methods for finding delaminations: Inflation Manual What we do Tap Testing- What UK believes will be needed “Woodpecker” automated tap tester- Needs to be tested, but I think this is where Yale wants to go (~10 k) Ultrasonic cscan- The cool one that both Yale and Oxford got to play with(~42 -48 k) No decision was made… though Jens brought up idea of just buying the scanner sensor and writing the rest ourselves (not good reception) William Heidorn February 7, 2019 4

“Woodpecker” Tap Testing 5 1/11/2022

NDT Systems Ultrasonic C-scan Method XY STAGE TRANSDUCER 6 STAVE WITH DEFECTS 1/11/2022

NDT Systems Ultrasonic C-scan Method (cont’d) C-scan of Yale stave 2 R compared to defect map 7 1/11/2022

NDT Systems Ultrasonic C-scan Method (cont’d) 8 Some c-scans of Oxford Stave defects 1/11/2022

Orbital welding of thin Ti-pipes: Frauke Poblotzki Some interesting images of Ti pipes from the petals cooling pipes They found that the inside of their Ti pipes were coated with a black material, that I don’t believe we saw? William Heidorn February 7, 2019 9

William Heidorn February 7, 2019 10

My Talk: Thermal Shocks Went Okay Graham- happy with resolution and reproducibility of thermal spectra Vitaliy- question about substructure that we see in laser scanning that appears after first scan(next slide) Jens- interested in how our system works, wanted to understand the complications of adding in a new sensor William Heidorn February 7, 2019 11

Laser Scanning Stave 6 J Side Significant changes are observed! Before Cycling Residual RMS: 9 μm Subtracted Height [μm] No After Cycling Residual RMS: 7 μm William Heidorn February 7, 2019 12

Laser Scanning Stave 6 L Side Significant changes are observed! Subtracted Height [μm] No Before Cycling Residual RMS: 7 μm After Cycling Residual RMS: 7 μm William Heidorn February 7, 2019 13

Summary, What’s Next These are just a few highlights that I found interesting. There was a lot more that went on during the meeting. A good summary of the highlights for the strips presentations was, Strip Highlights: Dennis Sperlich Next we will want to do harder thermal shocks on core 6. Perhaps a nitrogen bath is in order? Waiting for 2 R to come back to do cycling. I have the feeling that Yale may not give it back until they make up their mind on the delamination QC William Heidorn February 7, 2019 14