1. GLAST LAT Project TKR Tower 4 and 5 hand-off review – June 8,2005 Hiro Tajima, TKR Tower 4 and 5 hand-ff review 1 GLAST Large Area Telescope: TKR Hand-off review for Tower 4 and 5 Hiro Tajima SU-SLAC R. P. Johnson UCSC Gamma-ray Large Area Space Telescope

2. GLAST LAT Project TKR Tower 4 and 5 hand-off review – June 8,2005 Hiro Tajima, TKR Tower 4 and 5 hand-ff review 2 Power Consumption Tower 5 is tested with I&T TEM/TPS which has somewhat higher PS voltages. Values for MCM measurements account for the increase due to PS voltage itself, not current increase due to voltage increase. Tower 5 PisaSLACMCM Tower total9.65 W10.15 W9.29 W Tower + TEM/TPS19.0 W19.9 WN/A Tower 4 PisaSLACMCM Tower total10.17 W9.86 W9.26 W Tower + TEM/TPS18.8 W19.3 WN/A

3. GLAST LAT Project TKR Tower 4 and 5 hand-off review – June 8,2005 Hiro Tajima, TKR Tower 4 and 5 hand-ff review 3 Bad channels (Tower 4)

4. GLAST LAT Project TKR Tower 4 and 5 hand-off review – June 8,2005 Hiro Tajima, TKR Tower 4 and 5 hand-ff review 4 Band Channels (Tower 5)

5. GLAST LAT Project TKR Tower 4 and 5 hand-off review – June 8,2005 Hiro Tajima, TKR Tower 4 and 5 hand-ff review 5 Hit Efficiency Tower 4 Tower 5

6. GLAST LAT Project TKR Tower 4 and 5 hand-off review – June 8,2005 Hiro Tajima, TKR Tower 4 and 5 hand-ff review 6 Trigger Efficiency Tower 4 Tower 5

7. GLAST LAT Project TKR Tower 4 and 5 hand-off review – June 8,2005 Hiro Tajima, TKR Tower 4 and 5 hand-ff review 7 NCR 516 for Tower 4 Tower 4 failed to read out data from GTFEs in clock/DVDD margin tests. –All layers failed @ duty cycle 58% –Layer Y4 low side failed @ duty cycle = 54 and 55%. –Layer Y4 low side failed @ f = 22 MHz. –Layer Y4 low side and Y1 high side @ DVDD = 2.46 V (setting was 2.5 V) Margin tests performed for all MCMs during burn-in and final test process. (No margin test in Italy.) Only possible fix: send tower back to Italy and replace Y4. Recommendation: Use it as is. –It works perfectly at nominal duty cycle with 3% margin. –It can readout all GTFE from high side on Y4 at 55% duty cycle.

8. GLAST LAT Project TKR Tower 4 and 5 hand-off review – June 8,2005 Hiro Tajima, TKR Tower 4 and 5 hand-ff review 8 Other Anomalies TE701 (Trigger Jitter test) failure on both towers. –This is an issue of requirement interpretation. –Working with trigger group to define clear requirement. Fit non-convergence for noise and gain test. –Known issue from Italy. –65 channels on Layer Y13, Tower 4 are affected. –These channels are confirmed to be functioning. Tower 5 failed clock duty cycle margin test @ 58%. –It passed at 55% (within specification) Tower 5 passed noise and gain test. –Past 6 towers all failed this test.