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17 May 2005Jim Lamb (UCSB)1 Status of Rod Production at UCSB This report covers the last week Reporting for: Dan Callahan Susanne Kyre Stephen Jaditz Puneeth.

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Presentation on theme: "17 May 2005Jim Lamb (UCSB)1 Status of Rod Production at UCSB This report covers the last week Reporting for: Dan Callahan Susanne Kyre Stephen Jaditz Puneeth."— Presentation transcript:

1 17 May 2005Jim Lamb (UCSB)1 Status of Rod Production at UCSB This report covers the last week Reporting for: Dan Callahan Susanne Kyre Stephen Jaditz Puneeth Kalavase Jim Lamb Claudio Campagnari assembly testing

2 17 May 2005Jim Lamb (UCSB)2 Summary of rod production at UCSB Stopped assembly Thursday May 5 because of concern with I2C errors We have built 20 production rods All 20 are tested on single rod stand 12 have been tested on multi rod stand

3 17 May 2005Jim Lamb (UCSB)3 I2C errors 6 out of 20 tested rods had I2C communication errors in position 6 Similar behavior at FNAL Reproduced at CERN –Not a feature of LtStruct software I2C communication sensitive to details of line impedance, cabling, noise, even detailed sequence of commands (!) Experts are investigating

4 17 May 2005Jim Lamb (UCSB)4 I2C errors (continued) There has been a proposal to have CERN people come to US Not universally favored at CERN For now, continue remote investigation

5 17 May 2005Jim Lamb (UCSB)5 Long Term testing Second batch of six rods went through longterm testing over the weekend –Last test cycle was interuppted by lack of fluid (slide 6) First set consistent with ARCS testing except one pinhole Second set consistent with ARCS testing –Disclaimer: didn't look at position six in detail because of i2c problems

6 17 May 2005Jim Lamb (UCSB)6 Long Term testing Progress made in analyzing the data –Verified that DefectAnalyzer flags the right things given the cuts we set –Saturated pulse shapes in inverter-on modes cause problems for flagging, because we can't set cuts differently for inverter-on/-off modes We can work around in DefectAnalyzer or fix it in LtStruct

7 17 May 2005Jim Lamb (UCSB)7 Long Term testing Chiller lost all its fluid at the beginning of last week, after several days of running –We surmised the cause was the long pipes between chiller and freezer, so we made plans to move the chiller closer We got new fluid on friday. Chiller ran out again on Sunday morning –Interrupted the last cycle of tests Leak found in an o-ring in valve between chiller and freezer –Still a good idea to move the chiller closer –The chiller is now moved

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