HALL-A STATUS REPORT

1
HALL-A STATUS REPORT

• Hall A Collaboration Meeting
• December 12-14, 2007
• KEES DE JAGER
• JEFFERSON LABORATORY

Our wine-and cheese gathering is in A110 on
Thursday evening, starting at 600 pm. Dennis has
graciously agreed to chaperone us. If you attend
(most of you, I hope) please pay Stephanie the
standard 9 contribution
2
Achievements 2007-I

• Successfully ran
• July E04-018 Elastic scattering off 3,4He Makis
  Petratos
• Aug-Oct Assembly of NaI calorimeter Alexandre
  Camsonne
• Installation for Coulomb Sum Ed Folts
• Oct-Dec E05-110 Coulomb Sum Zein-Eddine Meziani
• 13(!) proposals submitted to PAC-33 for a total
  of 281 days with an allocation of 101 days
• 7 completely new proposals
• 2 resubmissions to remove conditional approval
• 1 jeopardy
• 2 resubmissions to remove deferral
• 1 resubmission for additional beam time
• Essential whether new proposals can run in
  parallel with Qweak
• GEp and N-gt? definitely can
• PV-DIS and n-DVCS can if they take a hit in beam
  energy (polarization?)
• GMn, xgt2 and WACs probably can
• B(Q2), 4He(e,ep), deuteron threshold definitely
  can not

3
Hall A Approved Proposals PAC 4-32

• 43 Experiments completed
• 42(!) days scheduled for the next 12 months
• Backlog 4.7 years (annual average for Hall A is
  60 days at 80 funding)

4
Publications (incl. submissions) in 2007-I

• M. Iodice et al., High Resolution Spectroscopy
  12B? by Electroproduction, PRL 99, 052501 (2007),
  nucl-ex/0705.3332
• R. Shneor et al., Investigation of proton-proton
  short-range correlations via the 12C(e,epp)
  reaction, PRL 99, 072501 (2007), nucl-ex/0703023
• G. Ron et al., The Proton Elastic Form Factor
  Ratio µpGEp/GMp at Low Momentum Transfer, PRL 99,
  202002 (2007), nucl-ex/0706.0128
• M. Mazouz et al., Deeply Virtual Compton
  Scattering off the Neutron, PRL 99 2420501
  (2007), nucl-ex/0709.04501
• A. Shahinyan et al., The Electromagnetic
  calorimeter in JLab Real Compton Scattering
  Experiment,?arXiv0704.1830
• Total number of Hall A publications PRLPLB 30,
  PRC 14, 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
• Hall A has been running now for 10 years, with
  an average publication output of 4. Essential
  that more effort goes into publications,
  especially archival pubs
• Top cited Hall A publications 2 250, 13 50
• 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,ep) complete L/T separation
• E91-026 deuteron A and B next spring
• E93-050 VCS
• E94-010 GDH only introduction needed
• 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? published
• E93-027 GEp-I published
• E94-012 H(???)po published
• E94-104 ?n -gt p-p published
• E95-001 GMn published
• E99-117 A1n published

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Scheduled Experiments in Hall A

• Exp Title Contact persons
• Feb-Mar Installation of BigBite
• Apr-May E04-007 p0 electroproduction R. Lindgren
• May-Jul Installation of Polarized 3He target
• Jul-Dec run BigBite plus polarized 3He
  experiments
• E06-010 transversity Xiaodong Jiang
• E06-014 d2n Brad Sawatsky
• FY09 E05-015 3He SSA Todd Averett
• E05-102 Quasi-elastic 3He Doug Higinbotham
• 2009 HAPPEx-III, Lead Parity, DIS-Parity

• Schedule on the web through calendar 2008.
  However, there are significant uncertainties
  about the budget (continuing resolution possibly
  for full FY08, we might not get the Presidents
  budget,). Even if we do get PB08, the present
  budget allocation to Physics implies a 200 k
  cut for Hall A. If that sticks, lab management
  has been informed that we will have to delay the
  start-up of transversity by 5 weeks.
• All of this means that the beam schedule can only
  be trusted through May 2008.

7
Hall A Schedule (Very Tentative!)
Max energy Qweak will run at is 1.165 GeV (maybe
1.185 GeV, then 5 pass 5.7 GeV) Accelerator
needs 6 month down prior to the 12 GeV
installation
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6 GeV Energy Recovery Plan
Today
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Long-Term Schedule

• CEBAF will be limited to 33 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 still has 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 and polarization.
• Also, resources, both capital and designers, will
  become scarcer as the 12 GeV activities increase.
• PAC-33 is last 6 GeV PAC. Summer 2008 PAC will be
  charged to evaluate long-term schedule (that
  means that we need to have one by then!)

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12 GeV Schedule
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Summary

• Hall A continues to have a very active and
  successful research program, but running the 6
  GeV program will continue under serious pressure.
  Vocalize your concerns when you feel the need.
  Also, make our achievements known to the
  scientific community through timely publications.
• Have to start discussions about the form of the
  Hall A collaboration in the 12 GeV era.
• LRP report writing process practically completed,
  expect final report shortly.
• Please use your vote in the ongoing DNP election
  process