HALL-A STATUS REPORT

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HALL-A STATUS REPORT

• Hall A Collaboration Meeting
• June 21-22, 2007
• KEES DE 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 530 pm. Larry has
graciously agreed to chaperone us. If you attend
(most of you, I hope) please pay Shannon the
standard 9 contribution
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Achievements 2007-I

• Successfully ran
• Feb Elastic scattering off 7Li, B R. Gilman, D.
  Higinbotham
• Mar E06-007 208Pb(e,ep) 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

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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)

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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
  12B? by Electroproduction, PRL, nucl-ex/0705.3332
• R. Shneor et al., Investigation of proton-proton
  short-range correlations via the 12C(e,epp)
  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,?arXiv0704.1830
• Total number of Hall A publications PRLPLB
  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

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PUBLICATIONS-II

• Archival papers promised to be completed LAST
  year
• E89-044 3He(e,ep)
• 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,ep) published
• E91-010 HAPPEx-I published
• E91-011 N-gt? submitted
• E93-027 GEp-I published
• E94-012 H(???)po published
• E94-104 ?n -gt p-p published
• E95-001 GMn accepted
• E99-117 A1n published

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Scheduled Experiments in Hall A

• Exp Title Contact 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 p0 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,ep)

• 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.

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Hall A Schedule (Very Tentative!)
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6 GeV Energy Recovery Plan
Today
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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).

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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 (RD) -
  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

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12 GeV Schedule
12
LRP Recommendations

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.
2. 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.
3. 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.
4. 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.

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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 Labs 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.

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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