1. 14 June 2005C. Campagnari (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 assembly testing

2. 14 June 2005C. Campagnari (UCSB)2 Tests of I2C errors Visit from Guido Magazzu & Wim Beaumont June 3 to June 7 –Following the visit at FNAL Report available –http://hep.ucsb.edu/cms/rod/I2c_230_investigation_v.1.2.doc To make a long story short, problem is due to different RC on I2C clock lines going to hybrid and optohybrid –Causes wavefronts to change at slightly different times –See http://hep.ucsb.edu/cms/rod/TheGreatI2CMysteryv2.ppt

3. 14 June 2005C. Campagnari (UCSB)3 Present Electrical circuit AOH FE-Hybrid SCL SDA 82  Parasitic on FE Hybrid C H Parasitic on AOH C A C H > C A

4. 14 June 2005C. Campagnari (UCSB)4 (Main) Solutions under investigation R=82 Ohms  R=0 Ohms –As implication for power-on sequence. –Would need to power-on control and F.E. at the same time –Most robust from I2C stand point Tune one of the R to equalize RC – R to AOH ~ 820 ohm Jumper across resistance (see picture next page) –Forces same RC

5. 14 June 2005C. Campagnari (UCSB)5 Solution 6 AOH FE-Hybrid SCL SDA 82  Parasitic on FE Hybrid C H Parasitic on AOH C A PSU Control PSU FE before

6. 14 June 2005C. Campagnari (UCSB)6 Tests at UCSB RodModErrors 192jumper no i2c errors (warm, cold cycle) (some header errors) 361R=820 ohm no errors (warm, cold cycle) 498R=0 no errors (warm, cold cycle) 498R=0 single PS no errors (warm, cold cycle) noise OK 20R=3 kOhm error "23" in Wim's i2ctest.sh

7. 14 June 2005C. Campagnari (UCSB)7 Other stuff Still fighting coolant leak Isolated to flowmeters inside fridge Catalog says: flowmeters have vitan o-rings – Vitan is "bad" with C 6 F 14 Took it apart, observed damaged o-rings Solving this is highest priority to be able to begin production when I 2 C business is settled