Operations

The following procedures suppose that you use the remote control interface (i.e. Cryo Control Panel; CCP).  When you use the front panel of the magnet PS, some button operations are different.

Precautions

• The magnet LHe level is so high (>20%??) that LHe remains even if soft quench happens.
• A time to ramp up/down the magnet should be planned in advance, since it takes at least 1.5 hours.
• You should remember that any deviation from the standard procedure might cause quench.
• You are expected to know what should happen at each step and confirm that it happened.  You had better go through this procedure with another person who has already carried it out.
• You should search for any indication of quench during the operations, such as error messages on the magnet PS, sudden changes of Tank B, Coil T, Coil B, the magnet pressure, etc.
  • You can use this chart preset: https://e906-gat1.fnal.gov/data-summary/e1039/target-par-preset/magnet_ramp.php

Unlocking Controls

All controls on VI are usually locked, to avoid mis-operation.  When you need controls, you have to click the "All Controls: Locked" button.  It is preferable to apply the lock when you finished controls.

Procedures

(A) To Ramp Up

(B) To Switch to Persistent Mode

(C) To Switch from Persistent Mode

(D) To Ramp Down

Documents

• ORC 2049 - ORC of Super conducting magnet electronic connectors (in the target cave)
• oxford_seppo_magnet_cryostat_handbook.pdf
• oxford_seppo_work_notes.pdf

t.b.w.