Hadron Dipole Field Setting Instructions:

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

Turn on field regulation mode. Type desired field value into FieldSet (yellow field). Wait for field to reach the desired value (read from the blue field). After reaching the desired field wait 15 minutes to assure stable field. Pay attention to the current and field readings. 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 ($\sim$ 1.1 $\times$ 10$^{-3}$ T/Amp). The NMR will only 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
NMR locked but current	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	Push RESET.
(Usually but not always shows	communicating with
-#.0000000)	software.