wiki:ElbatTOF2017

Version 31 (modified by Michael, 4 years ago) (diff)

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SVN: ​http://gauss.bu.edu/svn/tof-system/

Two experiments:

Meetings

PCB Update 1/9/20

  • LV Mixer: Board is assembled but not yet tested.
  • HV Mixer: Fix footprints for U2 (FRM-0505S) & U3 (IK1212SA), oriented upside down
    -NOTE: U11 and U10 are inverting (UCC27518), Edit the schematic and footprint to reflect this.
    -U8 (SI8610EC-B-IS) was assumed to be an inverter but it is not.
  • ToF Adapter: Board is assembled with the need for some changes.
    -Fix footprint for U6 and U8 (SN74LVCG04), pads are too far apart and too large. It was still possible to solder but there is concerning clearance.
    -Fix footprint for U2 (MC100EPT25), footprint is too small. It was not possible to attach this component but this segment of the circuit is not immediately needed for testing. Possible temporary solutions could be dead-bugging the proper component to the back of the board or using another IC and dead-bugging that.
    -Look into removing 3.3V power supply and generating 3.3V from linear regulator
    -Move to female connectors
    -Shift connectors and make more room for BNC connectors
  • Filament Supply: Parts have arrived, still waiting for PCB to arrive.
    -Switch pins 2 and 3 on footprint U1E (LM6144)
  • Pre-Amp: PCB design up for review.
  • Firmware: Switch pin mapping to correspond with pin mismatch in U9 (10H124) on ToF Adapter
  • ALL:
    -Fix Testpoint footprints (move to 1/10")

PCB Documentation

Rev A boards ordered Dec 2019:

The following boxes/instruments need to be constructed for Xuetao in 2019:

Regular Helium

Metastable Helium

  • TOF box (pulse output only, no detector readout) NewTOFBox
    • Trigger signal out to TDC
  • Filament PS for Exciter (? not sure) ~1A for indirectly heated cathode NewFilamentSupply (one fil. end is at Cathode potential)
    • Can be same supply as for regular helium e-gun, pulsed at 200V
  • 200V bias supply for HV pulser
  • HV pulser (Bill's design with transformers) NewHVPulser
    • Update design if needed ("high-side" FET drivers?)

Older version of list for BU

  • TOF box
    • FPGA board with pseudo-random pulser and TDC; controlled via USB/serial I/F
    • Pulse input from detector preamp (also supplies preamp power)
    • 0..-25V manually adjustable supply for cathode offset (with panel meter)
  • Filament supply
    • Isolated supply, 0-3A constant current (?)
  • HV Pulser / Mixer
  • LV Pulser / Mixer
  • Preamp (MCP)
  • Preamp (Channeltron)
  • E-Gun power supply

On 5/30/19, Michael visited. He says only the first 4 boxes are needed. Xuetao will not use the Channeltron because he has a huge MCP.

For the "Regular" experiment, we use the MCP preamp and LV pulser

For the "Metastable" experiment, we use the Channeltron preamp and HV pulser

Photos (by board/box):

Photos (raw):