Hadron Dipole Field Setting Instructions:

Turn on power supply (contact James Proffitt, John LeRose, Javier Gomez, or Mark Stevens for assistance).

If the NMR is locked (The NMR is locked if the field reading in the blue field has a positive number and is updating itself). Don't worry it will get there.

If the NMR is not locked (negative but updating number in the blue field) but the current appears to be going in the right direction. Don't worry it will get there and the NMR should lock when you get into the vicinity of the desired field. If you're worried anyway and want to watch the field change. Push SEARCH. (The NMR will search over the full range of the probe rather than just in the vicinity of the desired field.) The NMR should lock in a minute or two.

If the NMR is not locked and the current is going in the wrong direction. (This can happen if you ask for a new field before you reach a stable setting). You must push SEARCH. (The NMR will search over the full range of the probe rather than just in the vicinity of the desired field.) The NMR should lock in a minute or two and the software will correct the current setting appropriately but slowly. If the NMR doesn't lock you may have to ask for a field value appropriate for the present current ( 1.1 10^-3 T/Amp). The NMR will ony search in the limited region of the requested field and should find a lock more easily. After getting the lock let things settle in for a few minutes and then ask for the field you want again. In extreme cases you may have to nurse it through the transition by asking for multiple small increments. If you ask for a change of less than 5% the NMR should not lose its lock.

To shut down: Set FieldSet to .18. Let current run down to just over 100 Amps. Then push stop on Dipole control screen

Problems Explanation Action

NMR not locked but current Normal operation for large Wait. (see above)

is changing in the right direction. field changes direction

NMR locked but current going in Normal operation. Wait going in the wrong direction.

NMR locked but field not Field regulation is disabled Check that field regulation

correct and current not or software is confused. is enabled. Enter desired

changing field value or one very near the desired value again.

NMR field display freezes. NMR Gaussmeter is not Reset meter by interrupting

(Usually but not always shows communicating with power (see below)

-#.0000000) software

All displays freeze Computer is hung up Reboot (see below)

Resetting NMR Gaussmeter:

Turn off power supply in rack in middle room ("Triple Output DC Power Supply" second rack, facing counting room, head high with white sign taped to front), wait about 20 seconds, turn back on. Press REM and SEARCH on the control screen. You may have to repeat this a few times to get it to work.

Rebooting: See Javier's written instructions (copied below) or call either Javier Gomez or James Proffitt.

>rlogin hallasc16
>(user) hacuser
>(password) hacuser1
>ctr x (rebooting) (windows will go blank)
After rebooting:
Make sure field regulation is enabled then set the dipole field in the dipole control window
set the current in the Q₁ control window and still in the Q₁ window make sure the following are set:
remote (comm)
unlock (fpanel)
negative (polarity)
Hit the OFF/RST button. (the box next to the "main power" will become red)
Hit the ON button