Hall A collaboration meeting, May 17-18, 2004, 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 16-17, 2004

KEES DE JAGER

JEFFERSON LABORATORY

Hall A collaboration meeting, May 17-18, 2004, 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 papers– E91-010 HAPPEx-I published– E89-003 16O(e,e’p) published– E99-117 A1

n published– E95-001 GM

n circulating– E93-027 GE

p resubmission circulating– Waiting on E91-026 (A and B)

• Central repository of figures on Hall A webpagePlease submit figures of all publications to Rob Feuerbach

• Physics Division Xmas party: Tuesday, Dec 21 at 1 pm (sign up with Heather 5$)

• Borrel: ARC 231-233, Thursday 5:30-8 p.m.

• sign up with Heather

. last persons clean up before leaving

Hall A collaboration meeting, May 17-18, 2004, 3Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Hall A Approved Proposals PAC 4-26

•31 Experiments completed •Backlog ~3.5 years (annual average for Hall A is ~90 days)

NumberApproved

DaysApproved

Polarizedbeam

Astatus

NumberCompleted

Daysrun

NumberJeopardized

Daysto be run

Nucleon and MesonForm Factors/Sum Rules

11 206 9 7 10 180 1 26

Few Body NuclearProperties

18 280 7 3 11 165 5 115

Properties of Nuclei 7 114 2 1 4 52 3 62

N* and Meson Properties 7 138 4 2 4 91 1 47

Strange Quarks 4 123 3 3 2 63 1 60

Total 47 861 25 16 31 551 11 310

Conditionally Approved 3 59 2 2 5 59

Hall A collaboration meeting, May 17-18, 2004, 4Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Proposals submitted to PAC27

. JeopardyPR05-002 +n -> π-p in 2H, 4He and 12C D. Dutta 11.5PR05-004 A(Q) at low Q in ed elastic scattering R. Gilman 6

. NewPR05-007 Parity violating DIS in polarized eD X. Zheng 46PR05-009 High-resolution study of nK+ B. Wojtsekhowski23PR05-010 Structure of Roper resonance S. Sirca 14.5PR05-013 Search for bound + Nuclei R. Feuerbach 9PR05-014 Neutron-tagged proton structure N. Liyanage 18PR05-015 Traget SSA in quasi-elastic polarized 3He T. Averett 28PR05-016 Measurement of F2

n/F2p from 3H/3He M. Petratos 35

. Total 191

. Allocation (35+5+8) 48

Hall A collaboration meeting, May 17-18, 2004, 5Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Septum Magnets

•Right septum can run at 60-65 µA

•Left septum quenched at 30 µA

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

•It will be cooled down during the February down

•A sweep magnet is being 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, May 17-18, 2004, 6Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Scheduled Experiments in Hall AExp Title SpokespersonsNov/Dec Installation of Big BiteJan-Apr E01-015 Studying the Internal Small-Distance Structure of W. Bertozzi, E. Piasetzky,

Nuclei via the Triple Coincidence 12C(e,e’pN) J. Watson, S. Wood

May 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 configuration

E04-018 Elastic scattering off 3,4HeE03-105 Polarization transfer in 4He(e,e’p)E02-004 A(Q) at low QE03-101 Hard photodisintegration of a proton pair

Hall A collaboration meeting, May 17-18, 2004, 7Operated by the Southeastern Universities Research Association for the U.S. Department Of

Energy

Thomas Jefferson National Accelerator Facility

Hall A collaboration meeting, May 17-18, 2004, 8Operated 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• CD-0 for 12 GeV approved, but next 4-6

months essential to obtain CD-1 approval

Keep up the good work!