Hall C physics program is now essentially only largeinstallation experiments.

1

• Hall C physics program is now essentially only
  large-installation experiments.
• Worry about capital funds and beam time needed
  to finalize large installations
• in reasonable time frame.
• Can only finalize experimental program in
  reasonable time scale if
• 1) Sufficient Capital funds to keep large
  installations moving.
• 2) Sufficient technical manpower to prepare
  installations well, saving
• largely on actual installation times.
• 3) Schedule large-installation experiments as
  large blocks of time.
• 4) Need to run at least 70 PAC days per year.
• Even in the best possible running/budget
  scenarios, Hall C can not run far more than 70
  PAC days per year on average if folding in the
  necessary installation times!

2
Hall C Research Program

• Have been running experiments since November 1995
• 613 PAC Days run, or 29.7 experiments (? 61 PAC
  days/year)
• (If 94 days lost in PAC jeopardy
  process are included 70 PAC days/year)
• 263 27 (50) PAC Days in queue, or 12.6
  experiments
• 27 days Conditionally
  Approved (CA), and 50 days out of books
• (almost all large-scale
  installation experiments)
• (Backlog 4.1 Years, assuming 70 PAC
  days/year)
• BUT Hall C has hidden backlog
• 8 Large Installations to date t20, GEn-98,
  HNSS,
• 
  GEn-00, GEn-01, G0 (x2), HKS
• 400 users representing 20 different countries
• No collaboration, but steering committee (Beise,
  Hashimoto, Opper, Van Oers) to represent user
  community involved in diverse Hall C program
  dominated by large-installation experiments.

3
Experiments completed in Hall C since 2004
DAYS
47
25
10
7
14
4.33
1.67
19
7

• HMS SOS running until mid-January, 2005
• In January, 2005 installation of the HKS
  experiment started
• In October, 2005 installation of the
  G0-Backward experiment started

S 135 70/year
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Hall C Approved Experiment Summary
Base Equipment Experiments (1.6 experiments, 16
days) E04-001 Measurements of F2 and R on
Nuclear Targets 5 days, 1/3
complete E05-017 Measurement of Two-Photon
Exchange in 13 days Unpolarized Elastic e-p
Scattering
Large Installation Experiments beyond HKS (11
experiments, 274 days) E04-115 G0 Backward Angle
Measurements 70 days A E04-101 Measurement
of the PV Asymmetry for the N-D 0
days B E05-108 G0 Backward Angle Measurements
(II) (50) days (CA) A- E04-108 Measurement of
GEp/GMp to Q2 9 GeV2 40 days A E04-019 Measu
rement of the Two-Photon Exchange Contribution
18 days A- in e-p Elastic Scattering Using
Recoil Polar. E03-109 Spin Asymmetries on the
Nucleon Experiment 27 days (CA) A- E04-113 Semi
-Inclusive Spin Asymmetries on the Nucleon 25
days A- E05-101 Helicity Correlations in
Wide-Angle Compton Scattering 14
days A- E05-008 The Qweak Experiment A Search
for Physics at the TeV 35 days A Scale via a
Meas. of the Protons Weak Charge E04-110 The
Neutron Electric Form Factor at Q2 4.3 GeV2
from 25 days A- the D(e,en) Reaction via
Recoil Polarimetry E05-115 Spectroscopic
Investigation of Hypernuclei in (II) 20
days A-
Color coding indicates experiments using similar
apparatus
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• More Realistic Assumption on future Hall C
  experiments and backlog, including
• a) hidden backlog
• b) installation times
• Typical Hall C year 70 PAC days 4-month long
  installation
• G0 Backward at 687 MeV ( N-D) 70 PAC days 5
  months 2006
• G0 Backward at 362 MeV (50 PAC days)
• GEp-III 40 PAC days 4 months 2007
• GEp-2gamma 18 PAC days
• SANE Experiment 27 PAC days 3 months
  2008?
• Semi-SANE Experiment 25 PAC days
• Wide-Angle Compton Scattering 14 PAC days
• HMS L/T (A gt 2) 3 PAC days
• e-p Linearity Test 13 PAC days
• Qweak Phase I 35 PAC days 6 months ?
• HKS-HES Experiment 20 PAC days 4 months
  ?
• GEn at Q2 4.3 25 PAC days 3 months
• HMS L/T (A 2) 9 PAC days
• HKS-HES Experiment II 30 PAC days

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Original Near-Term Program in Hall C

• Schedule shifted by 3 months compared to early
  05 version, due to
• More running time for HKS to compensate for
  difficult startup.
• G0 backward installation now 5 instead of 3
  months
• Installation schedule was untenable with only 5
  techs.
• G0 shielding more complicated.

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Budget Revisions Ongoing
The FY06 Budget for JLab is some 8 lower than
the FY05 budget. In addition, DOE-allowed RD
work for the 12 GeV project has highest
priority. Without 12-GeV construction funds in
yet, need to redirect funds within JLab to
maintain SRF core function personnel that was
paid with SNS funds. Implications 1)
Save on power bill by low-energy (or no) running
from May-September 2) Summer 2006 Run is reduced
by 7 weeks (i.e., 26 less running) 3) G0 low
energy run not truly for free anymore 4) Hall
C budget for operations capital funds reduced
by 300K (15) ? impact on expenditures for
future large installations Potential Impact
on HKS/HES Run 1) Also any Hall C expenditures
for new HES will be later in time 2) Strongly
believe we will stick to May-September down
times ? Installations occur in this
period. ? Stick to same setup for
September-May periods. ? Slows down Hall C
program
8
Revised Near-Term Program in Hall C
Schedule has shifted again due to forced Summer
down
9

• Hall C physics program is now essentially only
  large-installation experiments.
• Worry about capital funds and beam time needed
  to finalize large installations
• in reasonable time frame.
• Can only finalize experimental program in
  reasonable time scale if
• 1) Sufficient Capital funds to keep large
  installations moving. ?
• 2) Sufficient technical manpower to prepare
  installations well, saving
• largely on actual installation times. ?
• 3) Schedule large-installation experiments as
  large blocks of time.
• 4) Need to run at least 70 PAC days per year. ?
• In reality, lost some 9 months since one year
  ago due to schedule changes
• I suspect that from now on Hall C run periods
  consist of large-installation groups of
  experiments from September April, while
  installations occur from May-September
• March 2006 until May 2007 G0 runs
• September 2007 until May 2008 GEp-III, GEp-2g
• September 2008 until May 2009 SANE, semi-SANE?
• September 2009 until May 2010 Qweak, HKS/HES
• September 2010 until May 2011

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Bad news reduced budgets/running implies for
Hall C that we can realistically only do one
large-installation type experiment per year, from
September to April. This causes large delays for
Hall C. Best scenario may be to put HKS/HES and
Qweak together on floor and run
intermixed. Present 12 GeV planning Accelerator
down from mid 2010 to mid 2011. Not clear whether
this schedule remains as is or be delayed.
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• Present experimental program of Hall C
• Only 1.6 non-large installation experiments left
  (16 days)
• (cost left to finalize)
• G0 Backward Angle Large Installation 0.1M
• (estimate by Allison Lung collaboration, DOE
  contribution only)
• GEp-III Two-Photon Exchange Large
  Installation 0.5M
• (includes FPP cost, scattering chamber, and
  0.2M cost for large installations)
• Spin Asymmetries of the Nucleon
• Semi-Inclusive Spin Asymmetries of the Nucleon
  WACS
• Large Installation 0.3M
• (collaborations use grant funds for detectors)
• Qweak Large Installation 1.0M
• (does not include NSF/NSERC funding)
• GEn Experiment at Q2 4.3 Large
  Installation 0.3M
• (collaboration intends to scrounge purchase
  some detectors)
• HKS/HES Experiment Large Installation 0.5M
• (needs also new power supply, Japanese have
  secured 3M for HES)
• Additional (ongoing) work to improve reliability
  of HMS magnets and cryotargets, LCW system,
  Moller/detector upgrades 0.6M
• Compton Polarimeter 9.5KA Power Supply 1.2M

13
Old Long-Term Experiment Schedule(taking into
account a 3-month delay in the HKS/G0 schedules,
this is the version pre-PAC-28)
2005

• Hypernuclear Physics
• HKS Experiment (Hashimoto, Nakamura, Reinhold,
  Tang)
• Hypernuclear Life Time Experiment (Hu, Margaryan,
  Tang)
• Transition to E04-115 Experiment (Beck, G0
  Backward)
• G0 Backward Run (0.8 GeV 0.4 GeV)
• Transition to E04-108 Experiment (January, 2006
  )
• GEp-III Run (Perdrisat, Brash, Jones, Punjabi)
• 2-g Exchange Run intermixed?
• HMS L/T Runs? (Arrington, Bodek, Keppel)
• Polarized Target Runs
• SANE (g2 at high Q2) Run (Rondon, Meziani, Choi)
• Semi-SANE (flavor decomposition) Run (Jiang,
  Bosted, Day, Jones)
• Helicity in WACS Run? (Day, Wojtsekhowski)
• Qweak (Bowman, Carlini, Finn, Kowalski, Page)
  Phase I
• GEn Run (Madey, Anderson, Kelly, Kowalski,
  Semenov)?
• Qweak (Bowman, Carlini, Finn, Kowalski, Page)
  Phase II?
• HKS(II) Run?
• Start 12 GeV program?

2006
2007
2008
2009
2010
2012?
14

• Hall C FY06 Budget 10/05 (Revised 12/05)
• Operations budget FY04 we used 1,270K
• FY05 we had 1,190K, used it, but had an
• error of the bank ? 100K left
• FY06 expected 1,090K ( 100K carry-over)
• Capital budget 140K carry-over (screw-up in
  procurement)
• Capital budget 120K G0 Backward
• 536K Qweak (magnet stand, collimators,
  target)
• 620K 200K needed for GEp-III
• (new scattering chamber, GHS, etc)
• 50K typical for target group work
• 100K for SANE/semi-SANE/WACS
• (long-lead scattering chamber, etc)
• 175K for ½ of 9.5 kA power supply
• 20K for HKS/HES work
• 25K for HMS new controls
• 250K to start Compton work MIT/Bates
• ? of order 200K short on capital

15
Overview of Hall C Experiments

• 14 (Conditionally) Approved experiments require
  polarized beam
• 4.7 Experiments removed by jeopardy process
  indicated between ()
• Backlog 4.1 years (not counting 50
  G0-Backward-II days)
• G0-Backward G0-Backward-II 7050 days ?
• Summer of 2007 have projected 3.1 year backlog