Magnet Energization Procedure

Ramping the magnet is to be done only by target experts: Don Crabb, Donal Day, James Maxwell, Jonathan Mulholland.

Ramp Up Procedure

Restrictions:

• DO NOT run up the magnet with the shim heater or power supply off − magnet will quench
• DO NOT exceed rate limits listed below − magnet can quench
• DO NOT allow loss of cryostat isolation vacuum − magnet can rupture
• DO NOT allow persons with medical implants near magnet − death can occur
• AVOID the need for a fill during ramping - warm gas can cause quench. Induce a fill if the level is near 20%.
• Ensure safety prerequisites for magnet ramping are met.

Procedure:

1. Turn on magnet power supply and, if necessary:
   • Remove any unsecured magnetic objects from area within 4m of magnet
   • If no hall access has been made since last magnet use, search can be skipped
   • Turn on shim power supply and set shim heater on to 0.1 A, if necessary (on top of Magnet PS, Rack D)
2. Put PDP in "Monitor," if necessary, to allow update of switch and shim status
3. Hit "Unlock Magnet Controls" button in the Polarization Display Panel, PDP
   • Verify that there is no current in the leads (Power supply icon, far left)
   • Verify the Shim Heater is On (indicator in PDP and camera on PS). This must always be On!
4. Hit "Hold" button
5. Hit "Heater On" button and confirm this action in the dialog box that presents itself
   • Ensure the Heater On status with cameras on the PS and the indicator in PDP
   • Wait until timer counts down to zero
   • If the countdown starts before the indications, wait at least 30 seconds from the time the heater is on, ignoring the count-down
6. Set the first Setpoint and Setrate values. PDP should not allow you to exceed these rates, but be mindful.
   • Type the value 1.20 (this is in Amps/min) into the "Setrate" box
   • Type the value 60.0 (this is in Amps) into the "Setpoint" box
7. Hit the "To Setpoint" button

   Monitor the Voltage in the Coil and Leads (camera, PDP)! A high voltage is a sign of a coming quench.

   If it is increasing rapidly or exceeds 7.5 V, press "Hold"!

   Lower the rate and try again, ensuring the voltage stays low.

8. Wait for magnet to reach 60.0 A (45 min)
9. Press "Hold"
10. Set the Setpoint and Setrate values for the next current step:
    • Type the value 0.60 into the "Setrate" box
    • Type the value 72.0 into the "Setpoint" box
11. Press "To Setpoint"
12. Wait for magnet to reach 72.0 A (20 min)
13. Press "Hold"
14. Set the Setpoint and Setrate values for the last current step:
    • Type the value 0.30 into the "Setrate" box
    • Type the desired magnet current into the "Setpoint" box
    • Currents for full−field and for baseline measurements are on whiteboard
15. Wait until magnet current reaches the requested value (20 min)
16. Hit the "Hold" button
    • If persistent mode is not desired, stop here
17. Wait for 30 seconds
18. Hit the "Heater Off" button
    • Ensure the Heater Off status with cameras on the PS and the indicator in PDP
    • Wait until timer counts down to zero
    • If the countdown starts before the indications, be sure to wait at least 30 seconds from the time the heater is off, ignoring the count-down
19. If we are going to be ramping down the leads, hit "To Zero" button to ramp leads down
20. Hit "Lock Magnet Controls" button

Ramp Down Procedure

1. Hit "Unlock Magnet Controls" button in the Polarization Display Panel, PDP
   • Verify the Shim Heater is On (indicator in PDP and camera on PS). This must always be On!
   • Verify the Switch heater is OFF
2. Put PDP in "Monitor," if necessary, to allow update of switch and shim status
3. If necessary, Ramp the Power Supply to the Magnet Current
   • Type the value of the magnet current (this is in Amps) into the "Setpoint" box
   • Press "To Setpoint"
   • Wait for the PS current to reach the Magnet current
4. Hit "Heater On" button and confirm this action in the dialog box that presents itself
   • Ensure the Heater On status with cameras on the PS and the indicator in PDP
   • Wait until timer counts down to zero
   • If the countdown starts before the indications, wait at least 30 seconds from the time the heater is on, ignoring the count-down
5. Set the first Setpoint and Setrate values. PDP should not allow you to exceed these rates, but be mindful.
   • Type the value 0.30 (this is in Amps/min) into the "Setrate" box
   • Type the value 72.0 (this is in Amps) into the "Setpoint" box
6. Hit the "To Setpoint" button

   Monitor the Voltage in the Coil and Leads (camera, PDP)! A high voltage is a sign of a coming quench.

   If it is increasing rapidly or exceeds 7 V, press "Hold"!

7. Wait for magnet to reach 72.0 A (20 min)
8. Press "Hold"
9. Set the Setpoint and Setrate values for the next current step:
   • Type the value 0.60 into the "Setrate" box
   • Type the value 60.0 into the "Setpoint" box
10. Press "To Setpoint"
11. Wait for magnet to reach 60.0 A (20 min)
12. Press "Hold"
13. Set the Setpoint and Setrate values for the last current step:
    • Type the value 1.20 into the "Setrate" box
    • Type the value 0.0 into the "Setpoint" box
14. Wait until magnet current reaches zero (45 min)
15. Hit the "Hold" button
16. Hit the "Heater Off" button
    • Ensure the Heater Off status with cameras on the PS and the indicator in PDP
    • Wait until timer counts down to zero
    • If the countdown starts before the indications, be sure to wait at least 30 seconds from the time the heater is off, ignoring the count-down
17. Hit "Lock Magnet Controls" button