Hall A collaboration meeting, June 23-24, 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 MeetingJune 23-24, 2005

KEES DE JAGER

JEFFERSON LABORATORY

Hall A collaboration meeting, June 23-24, 2005, 2Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

GENERAL INFORMATION

• Significant progress on archival papersE91-010 HAPPEx-I publishedE89-003 16O(e,e’p) publishedE93-027 GE

p-I publishedE99-117 A1

n publishedE95-001 GM

n circulating-Waiting on E91-026 (A and B), E94-010 (GDH) and E91-011 (N->)

• 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

• With deep regret there will be no borrel this time (or any time soon)New lab policy requires an AD to be present, when alcoholic beverages are served on site, and I refuse to ask Larry/Dennis to do this

Hall A collaboration meeting, June 23-24, 2005, 3Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Publications (incl. submissions) in 2004-II

• K.A. Aniol et al., Constraints on the nucleon strange form factors at Q2 ~ 0.1 GeV2, PRL; 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• K. Kramer et al., The Q2-dependence of the neutron spin structure function gn

2 at low Q2, PRL; nucl-ex/0506005

• J.J. Kelly et al., Recoil polarization for delta excitation in pion electroproduction, nucl-ex/0505024• D.J. Hamilton et al., Polarization transfer in proton Compton scattering at high momentum transfer, PRL; nucl-

ex/0410001• Geraud Laveissiere, et al., Photon Electroproduction from Hydrogen at Backward Angles and Momentum

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

• V. Punjabi et al., Proton Elastic Form Factor Ratios for Q2 = 3.5 GeV2 by polarization transfer, PRC 71, 055202 (2005)

• Zein-Eddine Meziani et al., Higher Twists and Color Polarizabilities in the Neutron, PLB 613, 148 (2005)• Issam Qattan et al., Precision Rosenbluth measurement of the proton elastic form factors, PRL 94, 142301

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

PRL94, 082305 (2005)• Charles Hyde-Wright and Kees de Jager, Electromagnetic Form Factors of the Nucleon and Compton

Scattering, Annu. Rev. Nucl. Part. Sci. 54, 216 (2004)• Xiaochao Zheng et al., Precision Measurement of the Neutron Spin Asymmetries and Spin-dependent

Structure Functions in the Valence Quark Region, PRC 70, 065207 (2004)• Kevin Fissum et al., The dynamics of the quasielastic 16O(e,e'p) reaction at Q2 = 0.8 GeV2, PRC 70, 034606

(2004) • Alexander Deur et al., Experimental Determination of the Evolution of the Bjorken Integral at low Q2, Phys.

Rev. Lett. 93, 212001 (2004) • Moskov Amarian et al., Measurement of the Generalized Forward Spin Polarizabilities of the Neutron, Phys.

Rev. Lett. 93, 152301 (2004) • Geraud Laveissiere et al., Measurement of the Generalized Polarizabilities of the Proton in Virtual Compton

Scattering at Q2= 0.92 and 1.76 GeV2, Phys. Rev. Lett. 93, 122001 (2004)

Hall A collaboration meeting, June 23-24, 2005, 4Operated 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

•32 Experiments completed •Backlog ~3.5 years (annual average for Hall A is ~90 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

11 206 9 7 10 180 1 26

Few Body Nuclear Properties

17 268 7 3 11 165 6 103

Properties of Nuclei 7 114 2 1 5 75 3 39

N* and Meson Properties 8 146 5 2 4 91 1 55

Strange Quarks 6 159 4 5 2 63 1 96

Total 49 894 27 18 32 574 12 319

Conditionally Approved

3

59

2

2

5

59

Hall A collaboration meeting, June 23-24, 2005, 5Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Proposals to be submitted to PAC28

•JeopardyE02-101 Exclusive Study of Deuteron Electro-

Disintegration near Threshold K. Wang (16)PR05-102 Measurement of Ax and Az Asymmetries

in the Quasi-Elastic 3He Reaction (E02-108) S. Sirca 15

•NewPR05-105 Investigations of dynamical relativistic

effects in the nuclear medium using the 208Pb(e,e’p)207Tl Reaction A. Saha 9

PR05-112 Constrain d-quark polarization X. Jiang 24

PR05-103 Low-Energy Deuteron Photoproduction R. Gilman 14PR05-104 High-Energy Neutral Pion Photoproduction R.

Gilman 22PR05-110 Coulomb Sum Rule S. Choi 26PR05-107 Parity Violation in the Resonance Region P. Bosted 15PR05-109 HAPPEx-III K. Paschke 30

•Total 155

•Allocation (20+16+15) 51

Hall A collaboration meeting, June 23-24, 2005, 6Operated 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

•After opening up the upper half, paper tissue and tape was found (and removed) in the helium lines

•However, cooling it down in February did not show big improvement

•A sweep magnet has been constructed for HAPPEx which is expected to reduce heat deposition by factor 2-4

•Next test: can septa run with 100 µA on 20 cm LH2 (for HAPPEx)?

Hall A collaboration meeting, June 23-24, 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 SpokespersonsMay Installation of septaJun E94-107 High-Resolution 1p-Shell Hypernuclear Spectroscopy S. Frullani, F. GaribaldiJul-Nov E99-115 Constraining the Nuclear Strangeness Radius in PVES K. Kumar, D. Lhuillier

E00-114 Parity Violation from 4He at Low Q2: D. Armstrong, R. Michaels

A Clean Measurement of Rho

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

n at High Q2 G. Cates, K. McCormick,

B. Reitz, B. Wojtsekhowski

Jun Back to standard configurationE02-004 A(Q) at low Q (possibly in parallel to G0 backward at low energy)E04-018 Elastic scattering off 3,4HeE03-105 Polarization transfer in 4He(e,e’p)plus at least one more standard configuration experiment (E03-101, E04-107, E04-

002)

FY07 run mainly BigBite plus polarized 3He experiments

FY08 Lead Parity, Pentaquark search and if possible DIS-Parity

Hall A collaboration meeting, June 23-24, 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, June 23-24, 2005, 9Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

12 GeV Upgrade

• Spectrometer Mini-Review (January 4-5)• At this time, the option that has the best combination of figure of

merit and the least risk that covers most of the physics appears to be the HMS+SHMS configuration

• NSAC charge on Implementation of 2002 LRP• Highest priority to 12 GeV Upgrade• House and Senate markups (to 408 and 420 M$) make “disaster

scenarios” highly unlikely

• DOE Science Review (April 6-8)• Science was deemed outstanding• Major discovery potential in Hybrid Meson Search and Parity

Violation

• Dry run for Lehman Review• Went very well

• Lehman Review (July 12-14)• If successful, CD-1 by late September (no PED funds in FY06)

Hall A collaboration meeting, June 23-24, 2005, 10Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Preliminary Conclusions from Roy Holt

•The MAD is a bold new advance in spectrometer design that is very promising as a way to reduce the required beam time by at least a factor of two compared to the other configurations for most experiments. Nevertheless, it appears that there is a risk at this time in pursuing this option. Specific concerns which should be addressed before this option is pursued are:

Reliability of and effort involved in detector movement and re-calibration after movement, especially in combination with a septum.

Effects of relatively large background rates on the performance.

•At this time, the option that has the best combination of figure of merit and the least risk that covers most of the physics appears to be the HMS+SHMS configuration. If time permits, we advise that the feasibility of the MAD option should be studied thoroughly.

•In a further evaluation of the spectrometer configurations, a difficult single arm experiment such as x>1 should be included.

Hall A collaboration meeting, June 23-24, 2005, 11Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Hall A Activities

MAD (instrumentation review expected before summer of 2006)• Structural integrity: UMd engineer is performing simulations• Background: taskforce headed by Jian-Ping Chen is developing

detailed simulations for five characteristic experiments

Dedicated set-up(s) for parity-violating program

Moving future HKS program to Hall A (talk by Hashimoto)

Cheap spectrometer using Q2 and Q3 for less than 1 M$• Talk by John LeRose• Needs expressions of interest

Continuation of “6 GeV” program

Hall A Collaboration is invited to provide feedback and dedicated support in developing these future activities

Hall A collaboration meeting, June 23-24, 2005, 12Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Summary

• Hall A research program vibrant• Many exciting new results• Good progress on archival publications• Septum magnets are (finally!) operational• Scheduling for next five years will be difficult• 12 GeV project is gaining momentum and broad

recognition

Keep up the good work!