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- The insulation vacuum of the magnet has been pumped down for multiple days and the vacuum level is below 8x10−6 Torr
- The U-Tube connection between the magnet and the fridge is installed and pumped down to below 1x10−3 Torr
- The QT transfer line and all 3 stingers, Dewars and cold boxes have been pumped down to below 1x10−3 Torr
- QT transfer line stinger is installed on the north riser of the magnet
- Both QT dewars are full
- Magnet is backfilled and magnet pressure is above the atmosphere
- Magnet shield is filled with LN2: If not, then follow Filling Magnet Shield with LN2
- Purity of the system (after roots, outside tank, inlet of HR3, magnet return) is close (within 0.03%) to to reference (100.43%)
Training: No special training is needed.
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Risks: No Identified Safety Risks
Initial valve positions
VJVA, VJVB, VJVC | Closed |
VPC | Open |
VJVT | Closed |
Fridge run and bypass | Closed |
MFC2 and MFC1 | Closed |
RP4 | OFF |
Magnet return bypass valve | 0% |
Action needed before 1 hour
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- Start the transfer from QT deawar A and monitor the magnet pressure
- Open VJVA
- Open VJVT
- Close VPC
- Change the mode to Liquify if needed.
- When the magnet pressure reaches 5 psig, set the magnet return bypass valve to Auto Control with Flow and change the set point to 35 SLM.
- It should maintain the following conditions in the magnet.
- Maintain the magnet bypass return flow at 35 SLM.
- Magnet pressure < 5 psi
- Maintain the above magnet condition approximately for 5 days until the Coil T and Coil B temperatures reach ~40 K.
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