Hall A collaboration meeting, December 5-6, 2005, 1Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

HALL-A STATUS REPORT

Hall A Collaboration MeetingDecember 5-6, 2005

KEES DE JAGER

JEFFERSON LABORATORY

Mauro Iodice has kindly agreed to host a wine-and cheese gathering Monday eveningin the Residence Facility, starting at 5:30 pmEric Voutier has hand-carried a selection of French cheesesIf you attend (most of you, I hope) please pay Heather the standard 9 $ contribution

Hall A collaboration meeting, December 5-6, 2005, 2Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Septum Magnets

•Left septum can run at 60-65 µA

•Right septum quenched at 30 µA

•A sweep magnet was constructed for HAPPEx which was predicted to reduce heat deposition by factor 2-4

•HAPPEx-He showed only a very modest increase in the max. tolerable current to 35 µA

•However, HAPPEx-II with the hydrogen target could run at 58 µA

•In agreement with Eugene’s simulation

•Clearly, the neutron production from the helium target dumps a significant amount of heat into the septa

Hall A collaboration meeting, December 5-6, 2005, 3Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Hall A Approved Proposals PAC 4-27

•36 Experiments completed •Backlog ~4 years (annual average for Hall A is ~80 days at full

funding)

Number Approved

Days Approved

Polarized beam

A status

Number Completed

Days run

Number Jeopardized

Days to be run

Nucleon and Meson Form Factors/Sum Rules

12 219 10 8 10 180 2 39

Few Body Nuclear Properties

19 293 9 4 12 177 6 116

Properties of Nuclei 7 128 1 2 5 87 6 41

N* and Meson Properties 7 139 6 1 4 91 2 48

Strange Quarks and Parity Violation

8 196 5 7 5 130 1 66

Total 53 975 31 22 36 665 17 310

Conditionally Approved

1

30

1

1

30

Hall A collaboration meeting, December 5-6, 2005, 4Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Proposals to be submitted to PAC29

•JeopardyE03-003 Polarization Transfer in Wide-Angle Compton Scattering B. Wojtsekhowski 17E03-004 Measurement of the Single Target-Spin Asymmetry

in Semi-Inclusive Pion Electron Production on a Transversely Polarized 3He Target X. Jiang 24

E03-011 Clean Measurement of the Neutron Skin of 208Pb through Parity-Violating Electron Scattering R. Michaels 30

•NewPR06-00 Measurement of the neutron d2 B. Sawatsky 13PR06-00 PV electron scattering in the resonance region P. Bosted 14PR06-00 IA Limitations to the (e,e’p) Reaction on 208Pb A. Saha 10PR06-00 Strange form factor of the proton at 2 GeV2 B. Wojtsekhowski 35PR06-00 Transversity in π+ production X. Jiang 24PR06-00 Single Target-Spin Asymmetry in Inclusive Scattering T. Holmstrom 1

•Total 158

•Allocation(13+7+24+30) 74

Hall A collaboration meeting, December 5-6, 2005, 5Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Publications (incl. submissions) in 2005

• P. Ulmer et al., Polarization Transfer in the d(e,e’p)n Reaction up to Q2 = 1.61 (GeV/c)2, PRL.• J. Kelly et al., Recoil Polarization Measurement for Neutral Pion Electroproduction at Q2 = 1 (GeV/c)2 near the

Delta Resonance, PRC, nucl-ex/0509004.• K.A. Aniol et al., Constraints on the nucleon strange form factors at Q2 ~ 0.1 GeV2, PLB; nucl-ex/0506011.• K.A. Aniol et al., Parity-violating electron scattering from 4He and the strange electric form factor of the

nucleon, PRL; nucl-ex/0506010.• Geraud Laveissiere, et al., Photon Electroproduction from Hydrogen at Backward Angles and Momentum

Transfer Squared of Q2 = 1.0 GeV2, PRL; hep-ex/0406062.

• S. Escoffier et al., Accurate measurement of the electron beam polarization in Jlab Hall A using Compton polarimetry, NIM A551, 563 (2005).

• K. Kramer et al., The Q2-dependence of the neutron spin structure function gn2 at low Q2, PRL 95, 142002

(2005).

• J.J. Kelly et al., Recoil polarization for delta excitation in pion electroproduction, PRL 95, 102001 (2005).• V. Punjabi et al., Proton Elastic Form Factor Ratios for Q2 = 3.5 GeV2 by polarization transfer, PRC 71, 055202

(2005).• L.Y. Zhu et al., Cross Section Measurements of Charged Pion Photoproduction in Hydrogen and Deuterium

from 1.1 to 5.5 GeV, PRC 71, 044603 (2005).• Zein-Eddine Meziani et al., Higher Twists and Color Polarizabilities in the Neutron, PLB 613, 148 (2005)• D.J. Hamilton et al., Polarization transfer in proton Compton scattering at high momentum transfer, PRL 94,

242001 (2005).• Marat Rvachev et al., The Quasielastic 3He(e,e'p)d Reaction at Q2 = 1.5 GeV2 for Recoil Momenta up to 1

GeV/c, PRL94 192302 (2005).• Issam Qattan et al., Precision Rosenbluth measurement of the proton elastic form factors, PRL 94, 142301

(2005).• Fatiha Benmokhtar et al., Measurement of the 3He(e,e'p)pn reaction at high missing energies and momenta,

PRL94, 082305 (2005).

• Total number of Hall A publications: PRL+PLB 26+2, PRC 13+2, NIM 12.

• 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 collaboration meeting, December 5-6, 2005, 6Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

PUBLICATIONS

• Archival papers to be completed in the next year:- E89-044 3He(e,e’p)- E91-026 deuteron A and B - E93-050 VCS- E94-010 GDH- E99-007 GE

p-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 GE

p-I published E94-012 H()πo published E94-104 n -> π-p published E95-001 GM

n circulating E99-117 A1

n published

• Central repository of figures and publications on Hall A webpagePlease submit figures of all publications to Rob FeuerbachPlease send copy of all publications to Heather simultaneous to submission

Hall A collaboration meeting, December 5-6, 2005, 7Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Scheduled Experiments in Hall AExp Title Spokespersons

Dec-Feb Installation of polarized 3He target and Big BiteMar-May E02-013 Measurement of GE

n at High Q2 G. Cates, B. Reitz, B. Wojtsekhowski

Jun Back to standard configurationIn summer Hall A runs only if in parallel to G0 backward at low energyE05-103 Low-Energy deuteron photodisintegration R. GilmanE05-004 A(Q) at low Q R. Gilman

Sep-Oct E03-105 Polarization transfer in 4He(e,e’p) S. StrauchDec-Mar E04-018 Elastic scattering off 3,4He M. Petratos

plus possibly one more standard configuration experiment (E03-101, E04-107, E04-002)

FY07 run mainly BigBite plus polarized 3He experiments

FY08 HAPPEx-III, Lead Parity, Pentaquark search

Budget consequences not yet clear.For FY06 an up to 13% reduction (8% plus unknown recission).So far, 6 weeks cut out of summer running for G0 that will have to be run at a later stageIn Hall A highest priority to running experiments scheduled for 2006This will come at the expense of capital funding for future experiments

Hall A collaboration meeting, December 5-6, 2005, 8Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Hall A Schedule (Tentative!)

Hall A collaboration meeting, December 5-6, 2005, 9Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Budget and Long-Term Outlook

• Lehman Review (July 12-14) was very successful• However, CD-1 still not approved• FY06 budget does mention support for PED• Kovar has expressed strong support for 12 GeV upgrade even

after FY06 budget was decided on

• New improved design for the MAD spectrometer in Hall A• After spectrometer review Larry Cardman stated that a new review

of all upgrade instrumentation should happen in early 2006