DVCS collaboration meeting, December 15-16, 2008, 1 Operated by the Jefferson Science Associates for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility HALL-A Long-Term Schedule DVCS Collaboration Meeting Sousse, Tunisia December 15-16, 2008 K EES DE J AGER J EFFERSON L ABORATORY

DVCS collaboration meeting, December 15-16, 2008, 2 Operated by the Jefferson Science Associates for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility Scheduled Experiments in Hall A ExpTitle Contact persons Oct-Mar/Mayrun BigBite plus polarized 3 He experiments E06-010transversityXiaodong Jiang E07-013normal SSATim Holmstrom E06-014d 2 n Brad Sawatsky E He SSATodd Averett E08-005Target SSAVince Sulkosky E05-102Quasi-elastic 3 He Doug Higinbotham AugustE05-109HAPPEx-III Kent Paschke NovemberE08-011DIS-ParityXiaochao Zheng 2010 MarchE06-002Lead ParityBob Michaels  Under the resent budget scenario, JLab management has decided to terminate running after Mar 6 (the completion of d 2 n ) until mid August, the start of HAPPEx-III. This has the consequence that the three last polarized 3 He experiments will not run in the foreseeable future. However, it is rumoured that an omnibus bill will be approved “shortly after the Presidential inauguration”, that includes the full Presidential budget for DOE!

DVCS collaboration meeting, December 15-16, 2008, 3 Operated by the Jefferson Science Associates for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility Long-Term Schedule CEBAF will be limited to ~33 weeks of beam on target in FY10 and following FYs as long as the budget continues as expected. This corresponds to a total of 4 months accelerator down per year, with as much as possible during the summer. Accelerator needs 6 month down prior to the 12 GeV installation  The long-term schedule is locked by the start of Qweak, scheduled for May 21, Qweak will run at a fixed energy/pass of (possibly 1.185) GeV and maximum polarization, severely restricting the available energy selection, current and polarization.  Also, resources, both capital and designers, will become scarcer as the 12 GeV activities increase.  The three Hall A parity experiments can not run in parallel with Qweak, thus have to be scheduled starting mid August 2009, in the order HAPPEx-III, PVDIS and PREx.  The g 2 p experiment requires a very large installation effort, optimally in parallel with the 6 month accelerator down in  Only one experiment (4He(e,e’p)) not scheduled, two (PV-DIS and D(e,e’p)) allocated less than PAC approved, but three C3 experiments scheduled.

DVCS collaboration meeting, December 15-16, 2008, 4 Operated by the Jefferson Science Associates for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility Hall A Schedule (Tentative!) ‏

DVCS collaboration meeting, December 15-16, 2008, 5 Operated by the Jefferson Science Associates for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility YearExperimentMajor Installation TasksSpecial Accel. Requirements Scientific Rating PAC Days FY09 E06-010TransversityPolarized 3He, BigBiteStandardA29 E07-013Normal SSA in DIS on polarized 3He Polarized 3He, BigBiteStandardB0 (parasitic) E06-014d2nPolarized 3He, BigBiteStandardA13 E E Polarized 3He, BigBiteStandardB+8 E05-102QE 3HePolarized 3He, BigBiteStandardA-15 E05-109HAPPEx-IIIMøller and Compton Upgrade Small helicity correlations (~1/20*HAPPEx-I) A-30 (start) FY10 E05-109HAPPEx-IIICompletionSmall helicity correlations (~1/20*HAPPEx-I) A-Complete E08-011DIS-parityHigh-speed DAQA-32 (23 scheduled) E06-002PREX: Lead ParityRoom-temperature septa Møller and Compton Upgrade Small helicity correlations (~1/20*HAPPEx-I) A30 Draft Schedule – Hall A 1 of 2 3 Experiments Dropped if weeks Enhanced Parity Quality Requires equipment $$ early in FY09 to meet schedule

DVCS collaboration meeting, December 15-16, 2008, 6 Operated by the Jefferson Science Associates for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility Draft Schedule – Hall A 2 of 2

DVCS collaboration meeting, December 15-16, 2008, 7 Operated by the Jefferson Science Associates for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility 6 GeV Experimental Equipment: Hall A

DVCS collaboration meeting, December 15-16, 2008, 8 Operated by the Jefferson Science Associates for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility Topics for Discussion Under present FY09 budget no Hall A funds for testing of PbF2 crystals, but sufficient funds in FY10. Can testing be held off until October 1, 2009? The summer down starts on July 23, 2010 and lasts until September 3. Is this sufficient for DVCS installation? If not, for Hall A the down has to start earlier. We need sufficient user support at JLab, both for testing and assembly of crystals and for installation. Commitments! Hall A is scheduled to start taking 11 GeV beam on October 1, Can DVCS be ready to be the first experiment to run?

DVCS collaboration meeting, December 15-16, 2008, 9 Operated by the Jefferson Science Associates for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility Summary Hall A continues to have a very active and successful research program, but running the 6 GeV program will continue under serious pressure. A draft of a long-term schedule for the 6 GeV program will be discussed at PAC34 in January. Vocalize your concerns when you feel the need. Mont, the new JLab director, is actively getting involved in the JLab research program. He is being educated on the 6 GeV experiments through a series of lectures to which some of you (as spokespersons) have been invited.