MINERnA

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MINERnA
FE Boards and 2006 RD P. Rubinov/FNAL
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Electronics in MINER?A

• Front-end Electronics
• What we know
• What we need to do next
• DAQ and Slow Control
• What we need
• When we need it
• Power and Rack Protection
• a few words on Low Voltage
• grounding

FE Board
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Front End board

• 16ch proto FE boards have been used so far
  (designed to interface to Alner box)
• Seem to work ok.
• Tested LVDS chain scheme (work done by C Gingu)

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LVDS chain

• LVDS chain implemented by C. Gingu.
• Learn about reliability, latency, phase noise
• These set maximum chain length
• E.g. latency is 113ns per board so need spill
  signal at least 113ns121.4ns/foot 1.4uS
  before spill

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CW generator

• Recently assembled prototypes
• 22 stage Cockroft-Walton fed by a resonant
  converter
• Seem to work ok
• Needs to be tested with PMT tube

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Next step for FE

• 64ch board designed for Minerva PMT box
• Pick TriP or TriP-t
• Implement bigger FPGA
• Integrate CW generator circuitry
• Implement realistic LV distribution (worry more
  about power dissipation)

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Next step for FE

• Our current plan is
• HV generator is split in two partly in the
  base, partly on the FE.
• The base carries the actual diode ladder.
• It is designed to fit into the Minerva PMT
  box(now things are becoming coupled!)
• Design of the base is done and out for quotes.
• I think we can use a butchered up HV prototype to
  drive this base.
• Notice the LEMO- this connects to the last dynode

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Next step for FE
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DAQ

• We need CROC design which will allow for a
  realistic readout and control of the next
  generation prototype FE.
• The CROC is
• 100 digital 6U VME module
• Less complicated than FE but equally important.
• We need it
• to test a full length chain
• have sufficient DAQ bandwidth for PMT testing

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LV and Grounding

• Stan Orr (Fermilab engineer) has been asked to
  help us out with these issues.
• Stan is head of the Fermilab Electrical Safety
  Subcommittee so we are in very good shape here.
• LV distribution philosophy is
• Distribute at 48V (50V is safety threshold) to
  minimize current (smaller, simpler cable plant)
• Use commercial, off the shelf equipment.

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LV and Grounding

• Grounding philosophy
• Local reference for every PMT.
• One common safety ground.
• Important point
• Everyone should understand If it conducts, it
  is part of the electronics.(no matter what the
  WBS code is)

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Conclusion

• In FY2006 we expect to have
• Second FE prototype, realistic for Minerva
• Qty 20
• PMT base which works with M64 and our boxes
• Qty enough for PMT testing, 40
• CROC module
• Qty 4, at least one fully working needed for
  PMT testing.