For the second coil

To-do list

• Wiring
  • remove jumper box and cables and bring to F117 for rework - done
  • remove current-limiting resistor boxes, bring to F117 for rework - done
  • minimize summed coil voltage readouts, do most sums in PLC - done
  • add separate readouts of splice and vapor-cooled lead voltages - done
  • combine splice and lead into one hardware quench/overvoltage protection channel using Newport controller
  • match and balance all current-limiting resistors, go back to original 100k Ohm matched resistors - done
  • read out voltage taps for quench detection and DAQ using separate resistor chain - done
  • update wiring diagrams to "as built"
  • get diagrams and spec sheets to Fernando - done
  • understand signal clipping and interaction between readout modules, test and replace if necessary
  • minimize noise

• Danfysik power supply
  • understand ramp-down mechanism - done
  • measure fast dump resistors in power supply - done
  • eliminate 2V DC offset - done
  • fix slow dump - done
  • implement ground fault detection compatible with quench detector
  • make more copies of full Danfysik power supply manual (get from Steve L)

• Danfysik quench detector
  • match and balance resistors - done
  • install test points for gain/offset tuning - done
  • install pots for balance
  • install bias circuit if unable to eliminate Danfysik DC offset - not needed
    • doesn't appear to be needed since offset problem solved

• Dataforth system
  • Correct for 2M Ohm internal impedance and 200k Ohm resistors in voltage tap readouts

• USB device
  • install voltage dividers to extend voltage range
  • add resistors to Zener protection circuit

• automated elog entries
  • automatically dump screens to files
  • create perl script
  • create cron job

• A-B HMI improvements
  • get additional HMI client license from Steve
  • get second HMI computer working
  • implement A-B license server - done
  • get A-B IIS file server system working - done
  • upgrade to 100 screen license if needed
  • change HMI database to MySql - done
  • create more pre-defined trend plots
  • simplify existing screens
  • better indication of what caused fast/slow dump

• A-B PLC program improvements
  • new channels
  • simplify many operations
  • improve PLC early problem detection
  • improve PLC cryo control under varying CTF operating conditions
  • implement early-warning quench/overvoltage detection in PLC
  • use custom instructions to simplify code

• EPICS
  • serve out all PLC channels to CA
    • need list from Josh
  • implement guard shack notification for IOC hang/crash

For the hall

• UPS on Danfysik boards and contactor
• may implement active isolation depending on test results
• max ramp rate in the hall is 10V / 20H = 0.5 A/sec
• do we need additional valves, check valves, bypasses, whatever?
• do we need Dataforth voltage attenuators on coil tap channels?

Basic questions

• what is causing blockage in vapor-cooled lead?
  • broken valve!
• lag between field and current...are there turn-to-turn shorts in coil 1?
  • maybe short, maybe eddy currents
• what worked, what didn't for coil 1?
• what should we do differently for the next coil?
  • will we open up coils 3 and 4?
• what might we consider doing differently in the hall?
  • do we want an independent review of our fast (and slow) dump strategy and system?
• have we documented our experience?
• sub-coil inductances
  • measure with inductance meter on the platform
  • inductance seen on splices