Weekly Update William Heidorn ISU Weekly Meeting December
Weekly Update William Heidorn ISU Weekly Meeting December 2, 2019
Thermal QC I have been updating the ATLAS Thermal QC note most of last week. Goal is to have completed draft this week. It is a summary of the ISU thermal QC method with most of the major experiments/results that have been done over the last few years. Includes thermal QC summaries on every stave measured with the technique. I will present some thermal cycling results of Stave 2 R was cycled 420 times by Shuaiyan. Thermal measurements were taken both before and after the cycling. William Heidorn Thursday, January 13, 2022 1
Review: Stave Core Construction Stave cores are a sandwich of two bus tapes that will eventually hold 14 silicon strip modules on each side Structure made of carbon fiber honeycomb with a titanium cooling pipe embedded in thermally conductive foam running through it William Heidorn September 24, 2019 2
Review: ISU Thermal Imaging Technique Cooled to ~-37 C with Novec HFE 7100 fluid flowing 1 l/min through it IR image taken by FLIR A 655 sc with 80° wide-angle lens Minimum temperature along cooling pipe is extracted Linear parts are searched for defects with a defect finding algorithm Process is repeated at +40 C for reproducibility US Core #6 L Side (Mirrored) Fluid Flow William Heidorn Fluid Flow September 24, 2019 3
Review: Defect Finding Algorithm Searches linear portions of thermal profile for peak structures Finds all flaw peaks above extracted background A threshold is set for significant peaks in thermal profile To the right: US#2 R’s thermal profile with flaws found by the algorithm highlighted and compared to its implemented defect map William Heidorn September 24, 2019 4
Thermal Profiles: J Side Hot All measurements have fluid around +40 C Yale May 2019 ISU Post Cycling Post cycling seems to have a much higher fluid temperature? Defect finder finds all of the same defects William Heidorn Thursday, January 13, 2022 5
Thermal Profiles: J Side Cold All measurements have fluid around -55 C Yale May 2019 ISU Post Cycling Post cycling seems to have a much lower fluid temperature? Defect finder finds all of the same defects William Heidorn Thursday, January 13, 2022 6
Thermal Profiles: L Side Hot All measurements have fluid around +40 C Post cycling seems to have a much higher fluid temperature? Yale May 2019 ISU Post Cycling Defect finder finds all of the same defects William Heidorn Thursday, January 13, 2022 7
Thermal Profiles: L Side Cold All measurements have fluid around -55 C Post cycling seems to have a much lower fluid temperature? Yale May 2019 ISU Post Cycling Defect finder finds all of the same defects William Heidorn Thursday, January 13, 2022 8
Scaled Tdiff: Core 2 RJ Hot Scaled the post cycling measurement. Change in the background shape Maybe height change in defects… but wouldn’t describe it as significant… William Heidorn Thursday, January 13, 2022 9
General Conclusions All of the measurements detect the same flaws with no significant changes observed. After the cycling the fluid temperature is attaining colder temperatures… Why? Change in measurement taking method? Apparatus setup? Camera issue? Think it may be a good idea to retake these measurements. No way to make good difference measurements… William Heidorn Thursday, January 13, 2022 10
General Updates J/Psi Gamma ATLAS Editorial board was setup: Tentative first meeting December 11 th I plan to give a focus talk next week reviewing my analysis and the most recent advancements and discussions. William Heidorn Thursday, January 13, 2022 11
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