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U of R Status Report

U of R Status Report. IV curve and “second kink” QA stand status - R poly measurement has been debugged. IV curve. IV curve shows integrated leakage current for all strips If strips working properly the IV curve reaches plateau, stays constant until breakdown

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U of R Status Report

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  1. U of R Status Report • IV curve and “second kink” • QA stand status - R poly measurement has been debugged USCMS Tracker Meeting Sergey Korjenevski

  2. IV curve • IV curve shows integrated leakage current for all strips • If strips working properly the IV curve reaches plateau, stays constant until breakdown • Ideally total leakage current would be expected to be around 500 nA for ST OB2 • In reality IV curve always goes up due to early breakdown some “leaky” strips USCMS Tracker Meeting Sergey Korjenevski

  3. IV Curve USCMS Tracker Meeting Sergey Korjenevski

  4. Strip Leakage Profile USCMS Tracker Meeting Sergey Korjenevski

  5. “Second Kink” Abnormal change USCMS Tracker Meeting Sergey Korjenevski

  6. Together with strips USCMS Tracker Meeting Sergey Korjenevski

  7. “Leaky” strips break together Good Strip USCMS Tracker Meeting Sergey Korjenevski

  8. Second Kink Voltages • 30210431830707 NO • 30210431830713 NO • 30210431830715 weak 200V • 30210431830718 weak 190V • 30210431830801 obvious 185V • 30210431830802 NO (vacuum) • 30210431830803 obvious 190V • 30210431830805 obvious 195V • 30210431830808 obvious 190V • 30210431830809 obvious 200V • 30210431830810 obvious 160V • 30210431830811 NO • 30210431830812 obvious 175V • 30210431830813 weak 185V • 30210431830816 weak 175V • 30210431830819 BAD strip 130 • 30210431830822 weak 185V Out of 17 4 good; 5 sort of OK; 7 have 2nd kink; one BAD USCMS Tracker Meeting Sergey Korjenevski

  9. “Second Kink” • Second kink indicates partial breakdown. • Contributing strips are not necessary qualified as bad strips though probably are not reliable at all. • If bad “leaky” strip definition would be strip current > 5 nA (currently > 100 nA), ALL ST sensors will fail. USCMS Tracker Meeting Sergey Korjenevski

  10. Status report on QA stand • Noise while testing Rpoly was because of the way value of current was taken. • Bug was found and fixed. • Next would be optimization of the program eliminating not necessary delays and crosschecks. • This doesn’t interfere with testing in general. USCMS Tracker Meeting Sergey Korjenevski

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