Log entry time 12:14:18 on June15,2004

Entry number 125850

Here is how to dither by hand (i.e. position & energy modulation).
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Eventually this will be more automated.
 
 Procedure to take a beam modulation run
 
1) Inform Hall B (x5126) a little in advance (15 minutes).  Negotiate 
with them on when to do modulation. 
  
2) When it is time for the test, end any current HAPPEX parity run. 
  
3) Call MCC and ask that first inform Hall B that the Hall A 
modulation run is starting.  They need to enable modulation by 
setting the "modulation on" flag, but they do not need to change 
the energy or position fast feedback state (both should be "on").
  
4) On the "greenmonster" GUI (the green GUI with a drawing of Mike 
from Monsters, Inc), go to the the BMW tab, and  
click "Start Modulation" from the top box.
If there is  no "Start Modulation" button, click the "Check Status" 
button.  If there is still no "Start Modulation" button, click 
"Set Kill Switch" button, then wait  3 seconds, and click "Check Status".
If there is _still_ no "Start Modulation" button, ask the expert 
(Kent Paschke). 

5) Start the parity DAQ, and take 10 minutes (18k events) of "beam 
on".  Don't count time with the beam off, and subtract add at least 
one minute for each beam trip.   Verify modulation is happening
by looking at the "Target BPM" and/or "Dithering"  
screens of the "happex" panguin configuration.  


6) After accumulating >18k events with beam on, end the parity run. 
Call MCC and have them disable dithering by setting the "modulation off" 
flag.  Also ask that they inform Hall B that the test is over. (MCC 
will also tell them.  The redundancy in communication is good.) 


7) This step important:
On the greenmonster GUI, press the "Set Kill Switch"  
button in the top box. Verify that the top line of the bmw box says "kill switch
on" and not "kill switch off".  If we screw this up, we will still be pausing
the energy FastFeedback with a very high duty factor, and Hall B will be very
ticked off.

8)  Record this run as a "Dithering run" on the runsheet. Add the 
run to the runlist with the phrase "Dithering run" included in the 
comment field.  Mark the time of this dithering run on the white 
board so the shift crew knows the next time to take one.

Once per 2 hours, approx. Oh, and you may want to 
verify from data that dithering is not happening
when you think it is not.