Operations

To Ramp Up
(See UVA elog 154; http://twist.phys.virginia.edu:8081/General/154)
- Confirm that the shim PS is powered ON.
- Press "To Zero".
- Turn on the main and shim switch heaters.
  Confirm that the two LEDs on the shim PS are ON.
- Set "2 A/m" and "45 A".
- Press "To Set".
- Wait until the current becomes the SP.  Should take 22.5 minutes.
- Set "1 A/m" and "63 A".
- Press "To Set".
- Wait until the current becomes the SP.  Should take 18 minutes.
- Set "0.5 A/m" and "74.78 A".
- Press "To Set".
- Wait until the current becomes the SP.  Should take 24 minutes.

To Switch to Persistent Mode
- Turn off the main and shim switch heaters.
- Press "To Zero".
- Wait until the current becomes 0 A.   It will be slow at the beginning. Should take 4 minutes.

To Ramp Down
(See UVA elog 174; http://twist.phys.virginia.edu:8081/General/174)
- Confirm that the shim PS is powered ON.  If not, turn it on and check why it was off.
- Set 74.78 A.
Heater should be switched off during this operation. 
Check that "Clamped Rate Limit Quench" should be not red. 
Once current in power supply reached at magnet current 74.7802 Amp then power supply should attains the HOLD. 
Wait for 20 seconds then turn on the "Heater ON". 
After Set the current at 63.0 Amp and set rate at 0.5 Amp/min then go to Home and then press in the "To Set" this shows "Rate limit" on the home screen. 
After reached at 63.0 Amp. 
Set current at 45 Amp and set rate at 1 Amp/min and goto the main screen wait 20 seconds and then press on "To Set". 
After reached at 45 Amp.  
Then set current at 0 Amp and set rate at 2 Amp/min and then go to the home screen wait for 20 seconds and then select "To Set". 
Once it reached at 0 Amp this will goes to "Hold" automatically. 
Wait for 20 seconds and then turn of the "Heater OFF" And Turn off the Shim power Supply. 

Notes:
 because both should be same as magnet current and the power supply current. 

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

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