Shift Summary: 16:00-23:59

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User name sarty

Log entry time 23:51:07 on December18,2011

Entry number 360827

keyword=Shift Summary: 16:00-23:59

Start shift in the midst of doing current scan (for Toby) in Run Plan setting "6A" (Carbon Target in, P0 = 1.211 GeV/c, Fast Raster Off).
Also starting with beam position at what was supposed to be (X,Y) = (+1mm, -1mm) ... but beam position is moving during period 16:00-16:45;

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Setting 6A:
@ 150 na - Runs 1932/21053: 15:54 - 16:24
@ 200 na - Runs 1933/21054: 16:25 - 16:55
@ 500 na - Runs 1934/21055: 16:56 - 17:05
- during run, asked MCC to try to stop beam position from wandering, and put it at (+1,+1 mm). This is done during the 500na runs.
@ 1000 na - Runs 1935/21056: 17:05 - 17:18

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Change momentum settings: 17:18 - 18:11

Continuing with instructed plan of taking runs that acquire 4M events (per arm), or 30 minutes in length, whichever comes first.

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Setting 7A: with 1uA, and beam position @ (+1mm, +1mm), Fast Raster OFF, Slow Raster OFF

- Runs 1936/21057: 18:14 - 18:35

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Setting 7B: as above, but with Fast Raster ON.
- Runs 1937/21058: 18:38 - 19:02

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Setting 7D: as above, but with Target OUT (empty)
- beam away to work on Hall B beam tune: 19:04 - 19:26
- Runs 1937/21059: 19:28 - 19:48 (lost beam at about 19:40)

- beam back at 19:50, but we need to restart CODA for HRS_L.
- Runs 1940/21060: 19:50'ish - 20:15
(when beam came back: running stable at BPMs (X,Y)=(0.6,1.3)mm...don't know why, but leaving it)

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Change Momentum Settings: 20:15 - 20:50

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Setting 8B: with 1uA, and beam position now @ (X,Y) = (-1mm, +1mm) on 1H05B; Fast Raster ON, Slow Raster OFF.

(run 1941 on left arm was messed up...seemed to be no end-run for 1940)

- Right Arm: Runs 21061 & 21062: 20:52-21:16 & 21:17 - 21:33
- Left Arm: Run 1942: 21:00 - 21:33

(lost beam in run, 21:25-21:30)

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Setting 8A: with 1uA, beam position still @ roughly (-1mm, +1mm); Fast Raster now OFF, Slow Raster OFF.

- Right Arm: Run 21063: 21:35-22:03 (with 4M events)..but then Right Arm CODA seems odd - next run started went to Run 21062?..figure it out while Left Arm "catches up" (didn't have 4M events yet).

- Left Arm: Run 1943: 21:35 - 22:12 (data file has "dat1" extension)

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Setting 8D: with 1uA, beam position as before (-1,+1), Fast Raster ON, Slow Raster OFF, Target OUT (empty target)

- Right Arm: Run 21066: 22:15 - 23:00

- Left Arm: not started at same time ... periodic problem: when end-run data isn't written, the next run started uses the same number as previous run! ... looking to fix this (at least not over-write anything) ... all ok (see note above after Run 1943)

Run 1945: 22:25 - 23:00
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Change Momentum of Left Arm to Setting #9 (.943 GeV/c)
(Right arm moving to Setting #10)
23:00 - 23:13

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Setting 9A (LEFT ARM only): 1 uA, beam position @ (0,0), Fast Raster OFF, Slow Raster OFF, Carbon Target IN

- Run 1946: 23:13 - 23:45

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Setting 9D-rev (LEFT ARM only): 1 uA, beam position @ (0,0), Fast Raster OFF (that's the "rev" part!), Slow Raster OFF, Carbon Target OUT (empty)

- Run 1947: 23:50 - (still running @ shift's end ... will run for 30 minutes).

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Plan for next shift is to keep Raster Off (so will do "A" settings and "D-rev" settings - meaning when target comes out, keep Raster Off). Right arm will only measure at "every second setting", so that it's Dipole can be settling while Left arm measures at the intervening settings.
Measurements at any setting shouldn't exceed 30 minutes.