1. FNAL module testing summary
7 modules are produced in December-January
Sensors were selected to have current below 1.5 mm
Module
709
710
711
712
713
714
715
sensors
# of bad channels 5
(72,74,82,511,512)
1 (333)
1 (232 -Istrip)
2 (143) (201 – Istrip)
1 (202)
1 (281 - Istrip)
Information
Current (mA)
4.0
3.6
3.5
3.2
5 (72,74,82,511,512)
2 (143, 486)
Grade A
After Long term ok
278 (noisy)
Additional information
PH (#512) repaired
Metallization problem
Pinhole #486 pulled
01/15/2004
E. Chabalina
CMS Tracker meeting

2. Module 705 before LT
After assembly module was tested (09/08) on ARCS at 400 V and graded “B” (6 faulty channels). No problems observed.
01/15/2004
E. Chabalina
CMS Tracker meeting

3. Module 705: LT data
Data was taken only at 20°C on Sept.19 (10 days after the first test). A group of high noise channels is seen around channel 219 and increased CMN in chip #2
01/15/2004
E. Chabalina
CMS Tracker meeting

4. Module 705 after LT - I
Module was re-tested on ARCS on 09/23. High noise in channel #219 and high CMN is observed at 400 V. At 200 V channel #219 has only slightly higher noise than the rest of the channels
01/15/2004
E. Chabalina
CMS Tracker meeting

5. Module 705 after LT - II
On ARCS kept module at 400 V for 30 minutes before testing (to allow current settle down)
CMN did not go away, it became even higher
01/15/2004
E. Chabalina
CMS Tracker meeting

6. Module 705: comparison of IV curves
”before” measurement is taken on 09/08 on ARCS before LT
“after” measurement is taken on 09/23 on ARCS after LT
green curve is a measurement done using Keithley on 09/24 with 1 minute interval between steps
No visual defects are observed on the sensors around noisy channel #219
at this point we can’t conclude whether the effect we observe is due to thermocycling or it is just time effect
01/15/2004
E. Chabalina
CMS Tracker meeting

7. Changes since October 2003: Upgraded from Lt_1_10 to Lt_1_22
Installed F-MUX, TPO, NIM2LVDS
Fixed Electrometers readout
Mounted thermal and hum. sensors to foam walls inside cold box
Less sections in ‘lt.xml’ are using ‘simulation = “yes” ‘
More people are trained to operate Lt stand (2 grad. students, 2 technicians)
Ready to thermocycle 10 modules at one time, ready to run hours scenario with 3 thermal cycles, PedRun, CalRun, IVRun.
01/15/2004
E. Chabalina
CMS Tracker meeting