1/13/2004USCMS Tracker Meeting Sergey Korjenevski U of R Status Report IV curve and “second kink” QA stand status - R poly measurement has been debugged.

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Presentation transcript:

1/13/2004USCMS Tracker Meeting Sergey Korjenevski U of R Status Report IV curve and “second kink” QA stand status - R poly measurement has been debugged

1/13/2004USCMS Tracker Meeting Sergey Korjenevski 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

1/13/2004USCMS Tracker Meeting Sergey Korjenevski IV Curve

1/13/2004USCMS Tracker Meeting Sergey Korjenevski Strip Leakage Profile

1/13/2004USCMS Tracker Meeting Sergey Korjenevski “Second Kink” Abnormal change

1/13/2004USCMS Tracker Meeting Sergey Korjenevski Together with strips

1/13/2004USCMS Tracker Meeting Sergey Korjenevski “Leaky” strips break together Good Strip

1/13/2004USCMS Tracker Meeting Sergey Korjenevski Second Kink Voltages NO NO weak 200V weak 200V weak 190V weak 190V obvious 185V NO (vacuum) obvious 190V obvious 195V obvious 190V obvious 200V obvious 160V NO obvious 175V weak 185V weak 185V weak 175V weak 175V BAD strip 130 weak 185V weak 185V Out of 17 4 good; 5 sort of OK; 7 have 2 nd kink; one BAD

1/13/2004USCMS Tracker Meeting Sergey Korjenevski “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.

1/13/2004USCMS Tracker Meeting Sergey Korjenevski 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.