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

3 May 2005Claudio Campagnari (UCSB)2 Status of Rod Production at UCSB Rod production delayed by recall of rods for PCB cleaning at CERN (end of March) First batch of cleaned rods arrived on Wednesday, April 20 First two production rods assembled on Thursday, April 21 First tests of these rods showed a few bad channels not expected from module testing

3 May 2005Claudio Campagnari (UCSB)3 UCSB Rod Production (cont.) The appearance of bad channels after rod assembly had also been seen on a few rods built in March (before CERN recall) Problem had been traced to scratches caused by the rod assembly tool Similar issue also at FNAL (same tool) Steps were taken to try to keep the tool clean, also inspect before use Apparently this is not enough

3 May 2005Claudio Campagnari (UCSB)4 UCSB Rod Production (cont.) Rod production was stopped immediately Modified tool. No more contact with silicon New tool picks up module from CF frame

3 May 2005Claudio Campagnari (UCSB)5 UCSB Rod Production (cont.) New fixture was used to remove five modules with new bad channels and replace them with fresh set of modules Assembly/Disassembly with new tool went well Rods were re-tested: no bad channels were introduced in assembly Resumed rod production Tuesday April 26 –Comfortably built 2 rods/day. Yesterday we built 4 –New tool works well Total of 14 rods have been built

3 May 2005Claudio Campagnari (UCSB)6 UCSB Rod Testing Teststands are operational –FNAL has seen occasional header errors that UCSB has reproduced when rod with header error was shipped to UCSB –Also concerned about I2C errors (next slide) –One outstanding bug in Lt analysis of pulse-shape, experts contacted Last details of long term scenario under discussion with FNAL Tuning of cuts for bad channel tagging will be done after test of a few more rods –FNAL results in this area very encouraging

3 May 2005Claudio Campagnari (UCSB)7 UCSB Rod Testing (cont.) Of the 14 built rods, 7 have been tested on single rod teststand –More will be tested today –One has "solid" I2C errors –Two have "sporadic" I2C errors It is a concern –FNAL has seen similar problems in recently built rods Discussing with CERN how to proceed

3 May 2005Claudio Campagnari (UCSB)8 UCSB Rod Testing (cont.) Was hoping to do first cold-cycle of load of 6 rods over the week-end. –Short developed in one of the control cables, took a while to find Started cold-cycle Monday May 2 (morning) – Aborted Monday evening due to Lt seg-fault Not sure why –Restarted it Monday evening. Failed during the night Thermistor used for interlock "came off" cooling circuit Now repaired, restarted cold-cycle this morning

3 May 2005Claudio Campagnari (UCSB)9 Summary Rod production started 1 week ago 14 rods built 7 rods tested on Single Rod stand – 3 with I2C errors  concern First Multi Rod testing (cold-cycle) in progress – clearly still a few teething problems Algorithm for tagging bad channels, rod- grading, etc, still needs some work