Day shift summary

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User name X. Zheng

Log entry time 16:00:25 on May 08, 2012

Entry number 383234

keyword=Day shift summary

08:00 Shift started with:

Left at 1.4684 GeV/c, events collected: 24.4M, scaled by average Pt²=61.6%² gives 16.34M, goal is 55M;

Right arm is being ramped up to elastic setting 2.2279 GeV/c.

09:30 Right arm dipole is set;

10:00 Moved target to carbon; Escorted access to put in sieve slits in both HRSs.

10:26 Changing Left HRS momentum to 2.251 GeV/c, the elastic setting for Carbon. At this point we realized the right arm is not set to Carbon elastic, but hydrogen elastic. We have set the Right momentum to 2.251 GeV/c as well.

10:38 Turned off both fast and slow rasters;

11:05 Moved target from carbon to CH2;

11:30 Done with optics. Changed Left HRS momentum to 1.4684 GeV/c, set Right HRS momentum to 1.1937 GeV/c; Escorted access to remove sieve slits from both HRSs.

11:36 Turned on both fast and slow rasters; Left P0 set, Right dipole still ramping.

11:47 Sieves are out. Waiting for beam. Right dipole still ramping, Right Septum set to same current as the Left.

11:57 Moved target to Top NH3 cell and start polarizing. Should have done this 20 minutes earlier, sorry!

12:15 Resume production on Left.

12:23 Changed beam IHWP from OUT to IN.

12:51 Changed target to bottom cell. Last run using Top cell is 5851.

13:26 The target polarization is 74% and rising but not rising as fast as expected. RF power is lower than expected. We asked for an escorted access so target experts can take a look at the target.

13:52 Turned on Right Septum regulation. Readback is 483A (previously was set to 603A).

14:01 Right arm momentum is set! But we are still in controlled access.

14:10 End of controlled access, we are ready for beam!

14:25 CODA crashed, kcoda and restarted for both arms. Runs 5852 and 24449 are very short junk runs.

14:35 Back to full production! First good production runs using the Bottom cell are 5853 and 24550.

15:43 Beam has been off for over 20 minutes. We stopped both arm data. Now changing Left momentum to 1.3509 GeV/c.

15:51 Left HRS momentum is set. But MCC is still having problem delivering the beam.

16:00 MCC is just ready for sending beam. We are ready for production for both arms!

Completed Production Runs During this shift:

Left P0	Left Goal	IHWP	Run number	Run nevents	Run Pt	Run nevents (scaled by Pt²)	Left accumulated nevents	Comments
1.4684	55M	OUT	by 8am				16.34M
		OUT	5842	7M	0.70	6.10M	22.44M
		OUT	5843	7M	0.69	5.92M	28.36M
		OUT	5844	7M	0.68	5.75M	34.11M
		OUT	5845	7M	0.68	5.75M	39.86M
		OUT	5846	0.36M	0.68	0.30M	40.16M
		OUT	5850	1.3M	0.60	0.83M	41.0M
		IN	5851	5.7M	0.54	2.95M	43.95M
		IN	5853	6.4M	0.81	7.46M	51.41M
		IN	5854	4.4M	0.78	4.76M	56.17M	no beam in the final 20 min
1.3509	26M	IN					0

Right P0	Right Goal	IHWP	Run number	Run nevents	Run Pt	Run nevents (scaled by Pt²)	Right accumulated nevents	Comments
1.1937	75M*2/3=50M		from prev. shift				0
		IN	24550	7M	0.81	8.16M	8.16M
		IN	24551	4.7M	0.78	5.08M	13.24M	no beam in the final 20 min

Completed Optics Runs During this shift:

Target	Left P0	Left Run number	Left run nevents	Right P0	Right Run number	Right run nevents	Comments
Carbon	2.2511	5847	0.35M	2.2511	24546	0.7M
Carbon	2.2511	5848	0.2M	2.2511	24546	0.7M
CH₂ hole	2.2511	5849	0.8M	2.2511	24547	0.66M

Production To-Do:

Left P0	Left Goal	IHWP	Run number	Run nevents	Run Pt	Run nevents (scaled by Pt²)	Left accumulated nevents	Comments	Comments
1.2698	29M						0
1.1937	75M*1/3=25M						0
1.1220	73M*1/3=24M						0
1.0547	72M*1/3=24M						0
0.9914	71M*1/3=24M						0
0.9319	69M*1/3=23M						0

Right P0	Right Goal	IHWP	Run number	Run nevents	Run Pt	Run nevents (scaled by Pt²)	Right accumulated nevents	Comments
1.1220	73M*2/3=49M						0
1.0547	72M*2/3=48M						0
0.9914	71M*2/3=47M						0
0.9319	69M*2/3=46M						0