Operations
To Ramp Up
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- Confirm that the shim PS is powered ON (if you can go in the hall).
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- Press "To Zero".
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- Turn on the main and shim switch heaters.
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- Confirm that the two LEDs on the shim PS are ON (if you can go into the hall).
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- Set "2 A/m" and "45 A".
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- Press "To Set".
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- Wait until the current becomes the SP
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- (23 minutes).
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- Set "1 A/m" and "63 A".
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- Press "To Set".
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- Wait until the current becomes the SP
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- (18 minutes).
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- Set "0.5 A/m" and "74.78 A".
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- Press "To Set".
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- Wait until the current becomes the SP
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- (24 minutes).
- Switch to the persistent mode, if you want.
Reference: UVA elog 154
To Switch to Persistent Mode
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- Turn off the main and shim switch heaters.
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- Press "To Zero".
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- Wait until the current becomes 0 A (4 minutes).
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- The ramp rate is slow at the beginning
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- .
To
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Switch from Persistent Mode
- Confirm that the shim PS is powered ON. If not, turn it on and check why it was off.
- Confirm that the main and shim switch heaters are OFF. If not, something is wrong.
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- Set 74.78 A
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- .
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- Step-by-step??
Confirm that "Clamped Rate Limit Quench"
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is not red.
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Confirm that the PS attains HOLD, once the output current reached at the SP.
To Ramp Down
- Switch back from the persistent mode, if necessary.
- Wait for 20 seconds then turn on the "Heater ON".
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- 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.
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- After reached at 63.0 Amp.
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- 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".
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- 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".
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- Once it reached at 0 Amp this will goes to "Hold" automatically.
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- 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. Reference: UVA elog 174
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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