Test Tube Activities at Ohio State (8/5/03)

1
Test Tube Activities at Ohio State (8/5/03)

• Two (very useful) sub-group meetings after last
  weekly meeting
• Mechanics (Bill, Lu, Mark, Jim, Charlie, Klaus)
  -gt see Marks report
• Electronics (Angelo, Klaus)
• OSU designes HV board, Distribution board (both
  inside AL box)
• Angelo will bring 6 (8 if possible) input
  protection circuits for anode signals
• Angelo will modify one FE board to receive
  (negative) anode signals
• Two (fine pitch) signal cables from AL box to
  mini crate
• 75 ft of Amphenol/Spectra Strip received
• With green (round) jacket, shielding
• 20 pairs
• Sent to SLAC (Charlie)
• Kerpen HV cable is still not available.
• SLAC (PCK) will try to obtain enough RPC HV cable
  for 8 HV lines from electronic hut to BaBar. Need
  to design HV transition box (8 short HV cables
  will be attached (soldered) to HV distribution PC
  board in AL box. Connect to long HV cables
  outside of magnet)

2
HV Distribution Board

• HV capacitors Cable Connector Anode signal
  readout
• Layout complete, 1 board for both tubes, Flat
  cable connector in hand
• Will be tested with OSU tubes
• Send to Princeton (or SLAC if too late)

3
Signal Distribution Board

• Allow for baseline (single ended),
  pseudo-differental, and fully differential
  configuration
• Layout (almost) complete
• Receive cathode signals (16) via short twisted
  pair stub cables
• 16 ch. Output (fine pitch twisted flat cable)

4
What will we need?

• 8 HV channels with current monitoring,
  overcurrent trip
• HV cables, HV connector box
• Low voltage /-5 V, 300 mA in AL box
• Low voltage /-5 V near mini crate (FE board,
  diff. Receiver)
• Install signal cables (on their way to Charlie)
  -gt Need to identify the location of a suitable
  FEC crate!
• This defines the location of the infrastructure
  connections in the AL box
• Need this today!
• Note Anode and Phi signals, HV, low voltage and
  gas (inout) will be all on the same side. The
  tubes will be shifted toward the other end of the
  AL box to make sufficient room for the
  infrastructure stuff.
• Coax cables from detector (mini crate location)
  to outside the shielding wall so that we can view
  signals with beams on