Test plan for Coil 1

Note (Nov 17) Fleshing out plan in D000000-13-13-P001 Rev A (p. 6 and 7 of document)

NOTE: If an unexpected fast dump occurs, allow the current to dump to zero amps -- do not reinitialize the power supply until current is zero, the dump-condition has been identified and repaired, and the Engineer-in-Charge (George) determines that it is safe to proceed.

Preparations

1. 1. Connect magnet power leads to power supply
      
      • NOTE: If testing is interrupted for any reason, the following 4 steps must be completed immediately prior to resumption of testing.
      • Mark Stevens
   2. Cordon magnet test area using initial ANSYS analysis results as a guide to locate ropes. Post hazard signs at all entry locations.
      • Tom Carstens
   3. Remove all loose, ferromagnetic items from the test area
      • Tom Carstens
   4. Set red beacons with 5 Gauss bioelectric device limit at the 3 aisle positions (beacons turn on at 5 Gauss)
      • Personnel: Jennifer Williams ES&H, Tom Carstens. Note beacons have been calibrated to flash at 5 Gauss. Signage?
   5. Ensure LCW to power supply is turned ON
      • Mark Stevens
   6. Set Slew Rate to 0.25 A/s
      • Mark Stevens
   7. Clear all interlocks
      • Magnet operator (Jonathan?)
   8. Zero out the strain gauge readings at zero current. (Calibration in progress of a strain gauge of coil 2 @LN2 temp)
      • Mark Wissmann
   9. At HMI, set axial Heim column force limit to ±10,000 lb and radial Heim column force limit to ±7500 Ib
      • NOTE: At all current settings below, monitor the Radial Heim Column loads for evidence of radial offset of the coil center from the yoke center. Compare axial Heim Column forces to the table of expected force vs. current.
      • George Biallas to generate table of forces.
   10. Check slew rate
   11. Ramp magnet to 5 A for each of checked items below
       • Check interlocks via checklist
       • Check all interlocks, slow and fast dump
   12. Using field probe, check the Bfield at several locations to verify expected magnitude and direction. If necessary, adjust 5 Gauss, bioelectric device boundaries as necessary to match MEASURED field.
       • Jennifer Williams ES&H
   13. Check DAQ and archiving of all signals, verify readback and online operation
       • Yi, Elliott
   14. Verify that clocks for slow and fast DAQ are synchronized
   15. Set magnet current to 0 A, wait for 0 A indication

Check turn-to-turn shorts

1. Verify that fast readout is operational for
   • current through the power supply (I, accuracy 0.1A)
   • the voltage on the power supply (U, accuracy 10 mV)
   • the induced voltage on four flux coils (V, accuracy 10 microV)
   • the longitudinal magnetic field at the center (B, accuracy 0.1 mT)
   • All measurements sampling rate of ~1000Hz.
2. Ramp up the current at 0.25 A/s, to 50 A. Stay at 50 A.
   • The expected 5 G contour is at about 2 m from the coil center. The walkways should be briefly blocked, the field measured in order to make sure they are below 5 G.
   • Check Heim column readings.
     • George
   • Analyze the ratio of B/I for the time interval of about 3 min
     • Yi, Eugene, Elton
   • Deviations from B/I=const indicate a short.
   • Check for deviations of (dI/dt)/V for indication of short.
   • If a short is indicated - stop the current for awhile. Convene a meeting in order to assess the risks. A possible path forward is to proceed with the test with a lower ramping speed and leveling the current every 30 s, or so.
3. If no short is indicated, ramp down to zero. Ramp back up the current at 1 A/s, to 50 A.
   • Check deviations of B/I and (dI/dt)/V
4. If no short is indicated - proceed to 150A at 1 A/s. Analyze the results:
   • B/I, U in order to make sure that we understand the performance.
   • The field at the center should be about 0.14 T.
   • The expected 5 G contour is at about 3 m from the coil center.
   • The walkways should be blocked till the field is measured, the closest ones would probably show >5 G.
   • Analyze the strain gauges measurements.
   • Check He flow in vapor cooled leads.
   • Checklist of all levels, temperatures and vacuum readings
5. Induce fast dump, and check recovery during dumping.
6. Discuss the results before proceeding to higher currents. If the results for 150 A are well understood proceed to 1050 A in 150 A steps, stopping at each step and analyzing the results.
   • Process checklist at each step.
7. When current is at 1050 A, pause and check all systems
   • Check Heim column settings.
8. Increase current from 1050 A to 1500 A in 50 A steps, check Heim column settings carefully.
   • Record a screenshot of stabilized strain/force values at each step
   • Trip a fast dump
   • Clear interlocks
9. Ramp up magnet from 0 to 1500 A. Discharge through a slow dump.