HF Electronics

1
HF Electronics

• PMT Readout Update
• E. Hazen, J. Rohlf, E. Machado
• Boston University

2
Outline

• PMT-to-QIE cabling summary
• Patch panel / ROBOX cabling design
• New QIE HF boards
• Test results (review)
• Plans for Test Beam

3
PMT-to-QIE Cabling
Multi-pin shielded connectors (MDR-36)
PMT Box
QIE Signal Input
PMT Anode
50O coax
Skew-Clear 50 ? single-ended to ground
QIE Reference Input
Two pairs per PMT channel
Coax shield ground at each PMT base
Separate Ground for each PMT
Overall shield connected to QIE ground
4
PMT Box Signal Cabling
SMB plug/socket for patch panel
MMCX on prototypes Soldered for production?
50 ? mini-coax
Patch panel PCBs
Space for HV, Gas connectors
5
MDR Connector
12-pair Skew-Clear cable handles 6 QIE
channels Each channel has Pair 1 Signal,
Signal Return, Shield Pair 2 Reference,
Reference Return, Shield Overall Shield connected
to metal connector backshell
Ref
Signal
Shield
Shield
Ref Return
Signal Return
Can accommodate ether paired or coax cable for
testing...
6
Skew-Clear Cables

• Two 5m cables delivered, but backshell with
  locking mechanism didn't fit... need to fix
  before testbeam cables are made.
• Can use existing cables for lab testing

Cables made by assembly house have only
shrink tubing
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QIE boards for HF

• New prototypes available here
• Hope to take some home with new CCM for testing
  starting next week...

8
PMTQIE Test Results (recap)

• Blue Nichia LED driven by Zetex avalanche
  transistor
• Pulser synchronized to QIE clock
• White paper (multiple sheets) used to attenuate
  to a fraction of a pe
• Data recorded using HTRDCC thru VME

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20 time samples (1500 V)
0-40 LC
pulse
reflection (electric)
reflection (electric)
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1, 2 pe response at 1500V
1500 V
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1pe peak vs HV
1100 V
1200 V
1100 V
1300 V
1400 V
1500 V
1600 V
1700 V
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Signal / Pedestal vs HV
sample 8 (pulse)
signal
sample 9 (reflec)
HV
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Average, Typical LED Pulses
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HF Electronics for TB

• BU Responsibilities
• 12 skew-clear cables
• Patch panels for PMT boxes (how many?)
• Plus participation in
• 3U crates w/ backplanes (2)
• CCM QIE board testing
• LV power (?)

15
Task List