Log entry time 08:01:27 on May 06, 2010

Entry number 321239

Shift Summary    Owl Shift    May 6, 2010    (PREx)

00:00 Status at start of shift:

Bob Michaels, Krishna Kumar and Jon Wexler are in the counting house working on the raster synch tests, test 5 of 9 (see log entry #321128). Raster size is 6x4mm2.

00:06 Called MCC to ask that they ramp current up to 50 uA (over about 1 minute).

00:08 Called MCC to ask that they ramp down and back up (over about 1 minute).

00:20 Called MCC to request better beam positions - they were ~1, 1 and 2, 2 in BPM A and B (x and y).

00:32 Beam positions better - they were ~0, 0 and 0, +1 in BPM A and B (x and y).

00:56 Changed to test #6 with free clock, 240Hz, TStable 4066.65.

01:39 Request 10 uA.

02:03 Moved from PbD #3 to #2 and back to #3 b/c we forgot to do a test with raster not synched (w/ 50uA).

02:46 Have moved to PdD#2, Decision is made to run with 240Hz, free clock, Octet overnight, waiting for beam to come back. 2 cavities in N. linac have failed; estimate 8 minutes.

03:08 Beam back and at 50 uA after checking beam positions and spot_L.

03:36 Completed BCM calibration run, setting up for production; adjusting HV settings for detectors and LUMIs.

03:50 Start of first production run.

07:00 Frequent CODA/ROC crashes...

07:48 Hear animal sounds in the stairwell... Ron heard it on the roof.

08:00 Shift ends....Hand off to next crew.

Runs Taken

Test Runs*

Parity   Beam Current   
Run #     (µA)
----     ------------ 
3502       50           
3503       50         Detector HV changes
3504       50         has detector HV changes, 240Hz line synch, correct
pedestals 
3505       50         free clock, 240Hz octet, TStable 4066.65 us
3506       10         free clock, 240Hz octet, TStable 4066.65 us
3507       50                 
3508       50         raster not synched
3509       50 
3510                  coda issues
3511                  coda issues
3512       50         same as 3505 except on PbD #2  
3513       50         ramping the beam current for BCM calibration
3514       50         adjusting HV
3515       50         adjusting HV              



*This is just a rough summary; see Bob's log entries for
details.



Production Runs

Parity   Beam Current   
Run #     (µA)
----     ------------ 
3516       50           
3517       50          coda crash
3518       50          coda crash
3519       50 
3520       50 
3521       50          coda crash
3522       50          coda crash
3523       50 
3524       50
3525       50          coda/ROC crash
3526       50          coda/ROC crash
3527       50          coda/ROC crash
3528       50
3529       50          
3530       50          started...