recent tob developments first lt failure and stereo module status j. incandela with slides provided...
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![Page 1: Recent TOB Developments First LT failure and Stereo Module Status J. Incandela With slides provided by E. Chabalina, A. Affolder, Dean White](https://reader036.vdocument.in/reader036/viewer/2022062421/56649d435503460f94a1f5f8/html5/thumbnails/1.jpg)
Recent TOB Developments
First LT failure and
Stereo Module StatusJ. Incandela
With slides provided by E. Chabalina, A. Affolder, Dean White
![Page 2: Recent TOB Developments First LT failure and Stereo Module Status J. Incandela With slides provided by E. Chabalina, A. Affolder, Dean White](https://reader036.vdocument.in/reader036/viewer/2022062421/56649d435503460f94a1f5f8/html5/thumbnails/2.jpg)
Report to TSC October 2, 2003 – Incandela 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.
![Page 3: Recent TOB Developments First LT failure and Stereo Module Status J. Incandela With slides provided by E. Chabalina, A. Affolder, Dean White](https://reader036.vdocument.in/reader036/viewer/2022062421/56649d435503460f94a1f5f8/html5/thumbnails/3.jpg)
Report to TSC October 2, 2003 – Incandela 3
Module 705: LT data – Data was taken 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 is seen in chip #2
![Page 4: Recent TOB Developments First LT failure and Stereo Module Status J. Incandela With slides provided by E. Chabalina, A. Affolder, Dean White](https://reader036.vdocument.in/reader036/viewer/2022062421/56649d435503460f94a1f5f8/html5/thumbnails/4.jpg)
Report to TSC October 2, 2003 – Incandela 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
![Page 5: Recent TOB Developments First LT failure and Stereo Module Status J. Incandela With slides provided by E. Chabalina, A. Affolder, Dean White](https://reader036.vdocument.in/reader036/viewer/2022062421/56649d435503460f94a1f5f8/html5/thumbnails/5.jpg)
Report to TSC October 2, 2003 – Incandela 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
![Page 6: Recent TOB Developments First LT failure and Stereo Module Status J. Incandela With slides provided by E. Chabalina, A. Affolder, Dean White](https://reader036.vdocument.in/reader036/viewer/2022062421/56649d435503460f94a1f5f8/html5/thumbnails/6.jpg)
Report to TSC October 2, 2003 – Incandela 6
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
0
5
10
15
20
50 150
250
350
450
applied voltage (V)
leak
age
curr
ent
(um
)
ARC before
ARC after
keithley
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 if it is some other effect
![Page 7: Recent TOB Developments First LT failure and Stereo Module Status J. Incandela With slides provided by E. Chabalina, A. Affolder, Dean White](https://reader036.vdocument.in/reader036/viewer/2022062421/56649d435503460f94a1f5f8/html5/thumbnails/7.jpg)
Report to TSC October 2, 2003 – Incandela 7
Why be concerned
• Several people have argued that this may not be a real problem for several reasons:
1. It is mainly occurring at high bias voltages2. It causes only a small amount of Common Mode Noise (CMN) 3. The noise is removed by CMN subtraction in the FED.
– In fact we see evidence that all of the above are false at significant levels.
– It may be that more sophisticated CMN removal algorithms are needed and hopefully the FED is capable of running them
– It may be that the new ST sensors have a drastic reduction in this problem– We will study 110 or so recent ST sensors sent to the US
(thanks Manfred et al.) as soon as they clear customs.
![Page 8: Recent TOB Developments First LT failure and Stereo Module Status J. Incandela With slides provided by E. Chabalina, A. Affolder, Dean White](https://reader036.vdocument.in/reader036/viewer/2022062421/56649d435503460f94a1f5f8/html5/thumbnails/8.jpg)
Report to TSC October 2, 2003 – Incandela 8
CMN Turn-on Voltage
CMN Turn-on Voltage
0
0.5
1
1.5
2
2.5
3
3.5
50 100 150 200 250 300 350 400 450
Voltage
Nu
mb
er o
f M
od
ule
s
![Page 9: Recent TOB Developments First LT failure and Stereo Module Status J. Incandela With slides provided by E. Chabalina, A. Affolder, Dean White](https://reader036.vdocument.in/reader036/viewer/2022062421/56649d435503460f94a1f5f8/html5/thumbnails/9.jpg)
Report to TSC October 2, 2003 – Incandela 9
Common Mode Subtracted Noise25 ADC
869 881 1010 1011 1013 1014 1015 1016 1030 1031 1038 1042
6.5 ADC
Modules with CMN (micro-discharge problem)Common mode subtracted noise in blue
For majority of modules with problems, the CM subtraction is imperfect.7 of 12 have >2.0 ADC noise
3 of 12 have more than twice the usual noise
![Page 10: Recent TOB Developments First LT failure and Stereo Module Status J. Incandela With slides provided by E. Chabalina, A. Affolder, Dean White](https://reader036.vdocument.in/reader036/viewer/2022062421/56649d435503460f94a1f5f8/html5/thumbnails/10.jpg)
Report to TSC October 2, 2003 – Incandela 10
Common Mode Subtraction Variation
• Common mode subtraction results clearly vary– Answer differs mode-to-mode or test-to-test– Would yield varying signal efficiency/noise during data taking– Not clear how this will evolve with time/radiation
Module 1016 Module 1010
![Page 11: Recent TOB Developments First LT failure and Stereo Module Status J. Incandela With slides provided by E. Chabalina, A. Affolder, Dean White](https://reader036.vdocument.in/reader036/viewer/2022062421/56649d435503460f94a1f5f8/html5/thumbnails/11.jpg)
Report to TSC October 2, 2003 – Incandela 11
UCSB Stereo Module Production• UCSB Stereo plate
completed on schedule– Tested via dry runs and
produced results as good as the r-phi plates “right out of the box”
– We made a fixture to attach the cable stiffener on our hybrids.
• First hybrid retrofitted last week. Tested cable by making/unmaking connection 20 times by hand. No apparent problem with functionality and no signs of cracking.
![Page 12: Recent TOB Developments First LT failure and Stereo Module Status J. Incandela With slides provided by E. Chabalina, A. Affolder, Dean White](https://reader036.vdocument.in/reader036/viewer/2022062421/56649d435503460f94a1f5f8/html5/thumbnails/12.jpg)
Report to TSC October 2, 2003 – Incandela 12
First Stereo Module
• First Stereo TOB module made at USCB– Well within specs mechanically and functions very well
• Kapton circuit was missing a trace for bias. We made it by hand with Ag Epoxy. Otherwise this is a Grade A module!
• First TOB SS6 module to be made today.