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HALL-A STATUS REPORT

HALL-A STATUS REPORT. Hall A Collaboration Meeting June 21-22, 2007 K EES DE J AGER J EFFERSON L ABORATORY.

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HALL-A STATUS REPORT

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  1. HALL-A STATUS REPORT Hall A Collaboration Meeting June 21-22, 2007 KEESDE JAGER JEFFERSON LABORATORY Because of the User Group Meeting we could not reserve the Great Room in the ResFac. Therefore, our wine-and cheese gathering is in A110 on Thursday evening, starting at 5:30 pm. Larry has graciously agreed to chaperone us. If you attend (most of you, I hope) please pay Shannon the standard 9 $ contribution

  2. Achievements 2007-I • Successfully ran • Feb Elastic scattering off 7Li, B R. Gilman, D. Higinbotham • Mar E06-007 208Pb(e,e’p) K. Aniol • Oct-July E04-018 Elastic scattering off 3,4He M. Petratos • June E03-101 proton pair R. Gilman • 10 proposals submitted to PAC31 for a total of 197 days with an allocation of 60 days • 3 proposals approved for a total beam time of 58 days • 2 proposals conditionally approved, need to come back to PAC • Submitted two 12 GeV proposals to PAC-32

  3. Hall A Approved Proposals PAC 4-31 • 44 Experiments completed • 42(!) days scheduled for the next 12 months • Backlog ~3.5 years (annual average for Hall A is ~75 days at full funding)

  4. Publications (incl. submissions) in 2007-I • B. Anderson et al., Extraction of the Neutron Magnetic Form Factor from Quasi-elastic 3He(pol)(e(pol),e') at Q2 = 0.1 - 0.6 (GeV/c)2, PRC 75, 034003 (2007) • Yi Qiang et al., A Search for Sigma05, N05 and Theta++ Pentaquark States, PRC 75, 055208 (2007) • J. Kelly et al., Recoil Polarization Measurement for Neutral Pion Electroproduction at Q2 = 1 (GeV/c)2 near the Delta Resonance, PRC 75, 025201 (2007) • A. Danagoulian et al., Compton-scattering cross section on the proton at high momentum transfer, PRL 98, 152001 (2007) • X. Jiang et al., Recoil Proton Polarization in High-Energy Deuteron Photodisintegration with circularly Polarized Photons, PRL 98, 182302 (2007) • M. Iodice et al., High Resolution Spectroscopy 12Bλ by Electroproduction, PRL, nucl-ex/0705.3332 • R. Shneor et al., Investigation of proton-proton short-range correlations via the 12C(e,e’pp) reaction, PRL, nucl-ex/0703023 • G. Ron et al., The Proton Elastic Form Factor Ratio µpGEp/GMp at Low Momentum Transfer, PRL, nucl-ex/0706.0128 • A. Shahinyan et al., The Electromagnetic calorimeter in JLab Real Compton Scattering Experiment,
arXiv:0704.1830 • Total number of Hall A publications: PRL+PLB 30(+3), PRC 16, NIM 14(+1). • Average time from completion of experiment to submission 20 months with 75% within 3 years. • At present 5 experiments that have not submitted a manuscript more than 3 years after completion • Essential that more effort goes into publications, especially archival pubs • Hall A has been running now for 10 years! • Please enter all publications into the JLab publication data base on submission

  5. PUBLICATIONS-II • Archival papers promised to be completed LAST year: • E89-044 3He(e,e’p) • E91-026 deuteron A and B • E93-050 VCS • E94-010 GDH • E99-007 GEp-II • E99-114 WACS • Achievements to date: • E89-003 16O(e,e’p) published • E91-010 HAPPEx-I published • E91-011 N-> submitted • E93-027 GEp-I published • E94-012 H()πo published • E94-104 n -> π-p published • E95-001 GMn accepted • E99-117 A1n published

  6. Scheduled Experiments in Hall A ExpTitleContact persons Jul-Sep down forced by FY07 budget restrictions Oct-Dec E05-110 Coulomb Sum Rule B. Sawatzky Jan-Mar Installation of BigBite Mar-Apr E04-007 π0 electroproduction R. Lindgren Apr-Jun Installation of Polarized 3He target Jul-Dec run BigBite plus polarized 3He experiments FY09 HAPPEx-III, Lead Parity, DIS-Parity, 4He(e,e’p) • Schedule in FY08 delayed by another month, driven by need to install and commission(!) new cryo-moduyles, but otherwise it would have been limited by the budget available for 6 GeV operations. • This will remain for the outyears with possible additional constraints driven by the need for engineering and design manpower for 12 GeV and limitations in capital funds.

  7. Hall A Schedule (Very Tentative!)

  8. 6 GeV Energy Recovery Plan Today

  9. Long-Term Schedule Highly likely that CEBAF will be limited to ~30 weeks of beam on target in FY08 and following FYs as long as the budget continues as expected. This corresponds to a total of 4 months accelerator down per year. Based on these assumptions Hall A would still have a full year of running available for new proposals. However, for the last 18+ months before the accelerator down we would have to run in parallel with Qweak at a fixed energy/pass of 1.1 GeV and possibly severe restrictions in the available current (I have suggested to Larry to run Qweak at 150 µA in stead of the requested 180 µA). Also, resources, both capital and designers, will become scarcer as the 12 GeV activities increase. Larry has “predicted” that there will continue to be 6 GeV PACs until ~3 years prior to the 12 GeV shutdown. This would mean that there will be (at least) two more 6 GeV PACs (2008 and 2009).

  10. 12 GeV Upgrade: Phases and Schedule (based on funding guidance provided by DOE-NP in April 2007) • 2004-2005 Conceptual Design (CDR) - finished • 2004-2008 Research and Development (R&D) - ongoing • 2006 Advanced Conceptual Design (ACD) - finished • 2006-2008 Project Engineering & Design (PED) - ongoing • 2009-2013 Construction – starts in ~18 months! • Accelerator shutdown start mid 2012 • Accelerator commissioning mid 2013 • 2013-2015 Pre-Ops (beam commissioning) • Hall commissioning start late 2013

  11. 12 GeV Schedule

  12. LRP Recommendations • We recommend the completion of the 12 GeV Upgrade at Jefferson Lab. The Upgrade will enable new insights into the structure of the nucleon, the transition between the hadronic and quark/gluon descriptions of nuclei, and the nature of confinement. • We recommend the construction of the Facility for Rare Isotope Beams, FRIB, a world-leading facility for the study of nuclear structure, reactions and astrophysics. Experiments with the new isotopes produced at FRIB will lead to a comprehensive description of nuclei, elucidate the origin of the elements in the cosmos, provide an understanding of matter in the crust of neutron stars, and establish the scientific foundation for innovative applications of nuclear science to society. • We recommend a targeted program of experiments to investigate neutrino properties and fundamental symmetries. These experiments aim to discover the nature of the neutrino, yet unseen violations of time-reversal symmetry, and other key ingredients of the new standard model of fundamental interactions. Construction of a Deep Underground Science and Engineering Laboratory is vital to US leadership in core aspects of this initiative. • The experiments at the Relativistic Heavy Ion Collider have discovered a new state of matter at extreme temperature and density - a quark-gluon plasma that exhibits unexpected, almost perfect liquid dynamical behavior. We recommend implementation of the RHIC II luminosity upgrade, together with detector improvements, to determine the properties of this new state of matter.

  13. LRP Recommendation #1 We recommend the completion of the 12 GeV Upgrade at Jefferson Lab. The Upgrade will enable new insights into the structure of the nucleon, the transition between the hadronic and quark/gluon descriptions of nuclei, and the nature of confinement. A fundamental challenge for modern nuclear physics is to understand the structure and interactions of nucleons and nuclei in terms of quantum chromodynamics. Jefferson Lab’s unique electron microscope has given the US leadership in addressing this challenge. Its first decade of research has already provided key insights into the structure of nucleons and the dynamics of finite nuclei. Doubling the energy of this microscope will enable three-dimensional imaging of the nucleon, revealing hidden aspects of its internal dynamics. It will complete our understanding of the transition between the hadronic and quark/gluon descriptions of nuclei, and test definitively the existence of exotic hadrons, long-predicted by QCD as arising from quark confinement. Through the use of parity violation, it will provide low-energy probes of physics beyond the Standard Model, complementing anticipated measurements at the highest accessible energy scales.

  14. Summary • Very successful outcome of LRP process, still a lot of work needed in writing the report. Provide all requested support. • Running the 6 GeV program will continue under serious pressure. Vocalize your concerns when you feel the need. • Have to start discussions about the form of the Hall A collaboration in the 12 GeV era • Congratulations to Joe Katych and Xaohui Zhan for their winning posters • All poster contributors are urged to provide copies of their posters • Please use your vote in the ongoing DNP nomination process • Support Curtis Meyer and Joerg Reinhold

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