• Object ID: 00000018WIA30772870GYZ
  • Topic ID: id_40024196 Version: 1.12
  • Date: Jul 26, 2022 1:19:46 PM

Magnet rundown unit test

About this task

The magnet rundown unit (MRU) operates as follows and is located inside the magnet room:

  • Rapid reduction of the magnetic field in about two minutes
  • Boil-off of cryogens, accompanied by loud hissing sound
  • Several days of down time to replace the cryogens

MRU type I reference number is 5196918 or 5196918-2.

Note: In the case of a quench or the Emergency Magnet Rundown switch is activated, the system decay time to reach 20 mT is 60 seconds.
Table 1. MRU type 1
NumberDescription
1CHARGER POWER LED
2BATTERY TEST LED
3HEATER TEST LED
4TEST HEATER LED switch (for use by GE Service Representative)
5TEST BATTERY button
6TEST HEATER switch
7HEATER ACTUATED LED

Use these steps to confirm that the MRU is connected to the magnet and operating properly by performing this test on the MRU every week.

Step-by-step instructions

  1. Verify that the green CHARGER POWER LED (1) is illuminated.
  2. Depress and hold the TEST BATTERY button (5) for 15 seconds.
    • The green BATTERY TEST LED (2) illuminates and remain lit while the TEST BATTERY switch is depressed.
  3. Place the TEST HEATER toggle switch (6) in the A position.
    • The green HEATER TEST LED (3) illuminates.
    • Note: Wait at least 5 seconds before toggling the TEST HEATER switch between position A and B. Not doing so may cause the red HEATER ACTUATED LED (7) to illuminate.
  4. Place the TEST HEATER toggle switch (6) in the B position.
    • The green HEATER TEST LED illuminates and it remains lit until the toggle is released.