Bad Boards 6May03

1
Bad Boards 6-May-03

• 574 CFTA 8B6 several dead channels
• 553 CFTS 3B1 in SVX0 sift 2 has large RMS
• 656 FPS 1A2 many problems with 2 sifts in SVX7
• 670 FPS 2A6 bad bias read-back
• 713 FPS 2A7 bias read-back 0, cryo read-back
  nonsense, no entries to hit map
• 548 CFTA 7A2 Unbiased VLPC?
• 462 CFTA 6A2 Unbiased VLPC?
• 622 CPS BA6 Unbiased VLPC?
• 624 CPS AA6 Unbiased VLPC?
• 513 CFTA 8B3 Major alarm on bias PV-SP-1.6V
• 551 CFTS 2B1 Major alarm on bias PV-SP2.4V
• 541 CFTS BA5 Major alarm on bias PV-SP-1.2V
• 647 CPS 3B3 Major alarm on bias PV-SP-0.35V

2
Board in slot 8B6

• There were 12 dead channels in this region

3
Temperature oscillating in 7B5 module 8

• Stopped oscillating after re-inserting of bayonet

4
7B5 module 8 temperature does not oscillate any
more
5
Problem with cassette?

• 3B1 did not improve after boards swap

6
Crate 0x53

• 7-May crate 0x53 taken out of run because of
  missing events
• Changed mezzanine board did not fix
• 8-May new VRBC installed, new VRB firmware
  installed
• 9-May crate 0x53 back in global run

7
Missing Events in 0x52 and 0x53

• New VRBC in ox53, old in 0x52
• 14-May-03 to 19-May-03
• Crate 0x52 6 times
• Crate 0x53 5 times
• Crate 0x52 power-cycled once to get rid of Sync
  error
• Init VRBC fixes the problem

8
Cft_examine

• Will be improved
• Hit maps for SVX hits only
• Hit maps after applying Svx reco thresholds

9
FPD

• 2 afe boards read-out by last VRB in crate 0x52

10
FPD talking points

• Are fpd boards in the run?
• Yes (as long as fpd VRB not entirely yellow)
• Change configuration of fpd system
  (disable/enable fpd boards in cft_gui)
• No. Have you just changed hardware configuration
  on the platform ? Anyway this would have to be
  followed by calibration which is not my job
• Download crate 0x52
• Is FPD examine showing new problems, gray color
  is okay too
• Calibrate crate 52
• Crate 0x52 is always calibrated, anyway this is
  not my job

11
Intermittent Alarms on 7A5 module 7

• AFE board 7A5 is connected to west-most cassette
  in EAST cryostat, only modules 5-8 are connected
  to detector
• This cassette is known to be the warmest and
  temperature fluctuations generate intermittent
  alarms
• CFTA_AFE_7A5/TCOV7
• Persistent alarms generated by this board require
  adjustment of cryostat temperature

12
Disabled AlarmsTalking points with Captains

• We have 29 Disabled Alarms, in total cft has few
  thousands of possible alarms
• It will take time to get rid of them, they
  require work on the platform
• Most of them are believed to be failures in
  read-back circuit