Log entry time 16:22:41 on September25,2005

Entry number 155914

Shift Summary: Day Shift Sept 25 2005 
Shift Leader/Target:   D.S. Armstrong

3rd:   G. Urcioli



   At start of shift: continuing with production running, 
38.2 µA on 4He target. Run 5354 continuing. Hall C
is off completely (as is Hall B), so we are sole user at the moment.
IHWP is IN. Right septum upper coil gets up to 7.70 K with 40 minutes
of steady beam. Beam is very nice and steady. 

9:45 Page Ryan, at the RC's suggestion, to arrange the
remaining RHWP scans to take advantage of Hall C being off.
Ryan explains to me what is needed, and we decide that Guido and I 
can do the scans ourselves, without requiring the experts (Ryan
or Lisa) to come in...

10:35 We end Run 5357 early after 25 K good pairs, to start the 
source scan.

RHWP Source Scan:

 end run 5357
 feedback off   (type this at command prompt on an apar@adaql account)
 dithering off   (using Green Monster)
 set Pockels cell voltages by hand to 180 V offsets using the 
"Laser Polarization & Parity Controls" medm screen:
 
GUN3 PITA POS  voltage was 7.262 V, set to 4.262 V
 "     "  NEG  voltage was 4.063 V, set to 7.262 V

 10:44 Start HAPPEX run 5358, IWHP in, RHWP scan
 once CODA started, invoke "auto_rhwp" at the ROC23 VxWorks window
 script starts, watch the RHWP update every 50 seconds in the Runbird
     window
 11:06 script ends, end run 5358
 call MCC, ask to remove IHWP
 run flipper, but do not increment slug number (we are in slug 117)
 set Pockels cell voltages by hand:
 
GUN3 PITA POS  voltage was 7.160 V, set to 4.160 V
 "     "  NEG  voltage was 4.400 V, set to 7.400 V

 11:10 Start HAPPEX run 5359, IHWP OUT, RHWP scan
 once CODA started, invoke "auto_rhwp" at the ROC23 VxWorks window
 script starts, watch the RHWP update every 50 seconds in the Runbird
     window
 11:32 script ends, end run. 
 call MCC, insert IWHP again. 
 run flipper, don't increment slug number.
 feedback on
 dithering (aka beam modulation) on
 11:36 Start HAPPEX run 5360, production again

Beam is marvelously stable throughout the scan. 

12:34 removed IHWP, ran flipper.



Meanwhile, find that Compton was off, DAQ hangup; did a CODA reboot and
restart. DAQ comes back up OK, and new run starts OK, but cavity power
is zero. Laser is on, but cavity is not locked. Try the cavity lock
instructions: Servo ON, slow Ramp procedure. No joy. Try a few
more times, adjusting the "tracking level" down to 0.3 as per
instructions. Still no joy. Page Sirish, but no answer yet. 

13:30 Sirish calls; he has relocked cavity from home, but only at low
power (150 W) instead of the 400 W we have had recently. Perhaps some
laser resteering needs to be done? He will continue to work on it. 
At this low power our signal/noise would be rather  marginal.

14:15 Sirish has resteered the Compton laser beam using the
mirrors, and now the cavity power is around 500 W. I start a new 
Compton run (12297). 


15:45 Did a scanner run (run 5365). 


16:00 Hand off to next shift, production run 5365 is underway; some 
trouble with that silly piece of software known as BTA.

HAPPEX Runs Taken
   Run     Pairs    IHWP

   5354     45 K     IN   Production
   5355     48 K     IN   Production
   5356     48 K     IN   Production
   5357     25 K     IN   Production
   5358     18 K     IN   RWHP source scan - not production
   5359     20 K     OUT  RWHP source scan - not production
   5360     49 K     IN   Production
   5361     48 K     OUT  Production - start of slug 118
   5362     46 K     OUT  Production 
   5363     33 K     OUT  Production 
   5364              OUT  Q2 scanner run - not production      
   5365  (underway)  OUT  Production   


Compton Runs Taken

   Run 12297   82.2% polarization, signal/background = 7.2
   Run 12298      (still underway)