Hall C Research Program

1
Hall C Research Program

• Have been running experiments since November 1995
• 613 PAC Days run, or 29.7 experiments (? 61 PAC
  days/year)
• 263 (77) PAC Days in queue, or 12.6 experiments
• (almost all large-scale
  installation experiments)
• (Backlog 4.1 Years, assuming 70 PAC
  days/year)
• 79 Ph.D. Subjects, 51 Ph.D.s awarded
• 38 refereed publications to date (20 PRL), 5
  submitted
• (not including
  NIM papers)
• 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.

2
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
3
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 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 A- E04-113 Semi-Inc
lusive 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-
4

• Realistic Assumption on Hall C experiments,
  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 25 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

5

• 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

6

• Summary (as shown at SANE meeting of September,
  2005)
• Reduction of technical crew by almost two has
  caught up with large installations
• HKS installation barely in time ? no quality
  checkout before start HKS.
• Cant do professional job of preparing well for
  next experiments, e.g. G0.
• Direct impact (far) longer installation times,
  and delay of 2005/2006
• schedule by about 3 months.
• 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. ?
• SANE specific will purchase new scattering
  chamber early in FY06, construction
• of polarized target raster systems ongoing,
  anticipated scheduling date 2008?
• SANE experiment essential to fulfill DOE
  Performance Measure milestone by 2011.

7
Very Old Long-Term Experiment
Schedule(assuming continuation of FY05 budgets
early 2005 version)
2005

• Hypernuclear Physics
• HKS Experiment (Hashimoto, Nakamura, Reinhold,
  Tang) (1.8-2.0 GeV)
• Hypernuclear Life Time Experiment (Hu, Margaryan,
  Tang)
• Transition to E04-115 Experiment (Beck, G0
  Backward)
• G0 Backward Run (0.8 GeV)
• Transition to E04-108 Experiment (September, 2005
  )
• GEp-III Run (Perdrisat, Brash, Jones, Punjabi)
• 2-g Exchange Run intermixed?
• HMS/SOS L/T Runs? (Bodek, Christy, Keppel)
• Polarized Target Runs
• SANE (g2 at high Q2) Run (Rondon, Meziani, Choi)
• Semi-SANE (flavor decompositions) Run (Jiang,
  Bosted, Day, Jones)
• Qweak (Bowman, Carlini, Finn, Kowalski, Page)
  Phase I
• GEn Run (Madey, Anderson, Kowalski, Semenov)
• Qweak (Bowman, Carlini, Finn, Kowalski, Page)
  Phase II?

2006
2007
2008
2009
2012? Start 12-GeV Program?
8
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?
9

• 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

10
Upcoming Program in Hall C
Schedule has shifted again due to forced Summer
down
11
Spin Asymmetries on the Nucleon Status
Now encompasses two experiments E03-109 SANE
(Rondon, Choi, Meziani) g1 g2
at Q2 4 GeV2 E04-113 Semi-SANE (Bosted, Day,
Jiang, Jones) Semi-Inclusive Spin Asymm.

• Designed to be insensitive to backgrounds and
  have good Particle Id. Target field screens much
  of low-energy background.
• Gas Cherenkov (Temple)
• Particle identifications (e/p)
• Minimal knock-on
• Prototype tested in Hall C
• Design Construction Now
• Lucite Cherenkov (Norfolk State)
• Redundant P.Id. coarse tracking
• Quartz detector as a Hodoscope
• before gas Cherenkov under
• consideration for e/e- separation
• Pb-Glass Calorimeter from GEp-III
• Add gain monitoring system (UVa)

Scattering Chamber under design, long-lead item
in FY06 Uniform polarized target raster RD
completed, construction done