About this Experiment

• Spokespeople: Jian-Ping Chen,   Zein-Eddine Meziani,   Paul Souder
• Abstract   Proposal  
• HEP data on-line data review for Structure Functions in Deep Inelastic Lepton Scattering, click here
• References
• COO -- Conduct of Operations for Hall A Experiment E99-117 (postscript)
  
  
• Previous Polarized ³He experiments: E94-010(1998), E95-001(1999)
• Following Polarized ³He experiments: E97-103(2001), E01-012 (2003), E97-110(2003)

Meetings

• 2002 Conferences
  
  
• Weekly meeting for A₁ⁿ/g₂ⁿ analysis and EEL target lab: Thursday, 3~5pm, Cebaf Center L207
• Minutes for A₁ⁿ/g₂ⁿ/nGDH joint analysis meeting: ( Sept.) ( Aug.) ( July) ( June) ( May) ( Mar.) ( Feb.) ( Jan.) ( Nov.) ( Sept.~Oct.)
  
  
• nGDH/A₁ⁿ/g₂ⁿ/GDH Collaboration Meeting
    March 15~16, 2002   Nov. 16~17, 2001
  
  
• Remembering Jindong Zhou Some photos
  
• End-of-Run Gathering
• Target installation: Cable List (summer, 2001)
• GDH/A₁ⁿ/g2 Collaboration Meeting
    Apr. 19~20, 2001   Mar. 23~24, 2001   Feb. 2, 2001   Nov.30, 2000   Oct. 2, 2000   Sept.8~9, 2000   July 6~7, 2000

Polarized ³He Target

• For EPR operator:
  • EPR Operator Procedure (postscript) (html).
  • EPR checklist
  • EPR calibration constant
  • EPR optics (sideview)
  • Technical notes on EPR
    • Guide for EPR measurement at Jlab, M. Liang (postscript)
      
    • Brief introduction for EPR measurement, M. Liang (postscript)
      
    • Technical notes on EPR, W. Korsch (postscript)
      
      
• How to become a TO
  
  
• Main page for our polarized ³He Collaboration
  
• Cells information
• Cells information from Univ. of Virginia   25cm ref cells information
• Wall thickness data (tested at EEL target lab, V. Sulkosky)
  
  
• Other Polarized ³He Target Homepages
  • E94-010 target homepage, click here
    
  • Temple University Polarized ³He Target lab homepage, click here
    
  • SLAC-E154 Polarized ³He Target homepage, click here
    
  • Princeton Polarized ³He Target Lab, click here
    
  
  

Data Analysis

• Off-line Analysis
  • Radiative correction - Polrad2.0
  • Minuit reference manual, F.James - Version 94.1
    
    
  • MAID - Photo- and Electroproduction of Pions, Etas and Kaons on the Nucleon click here
    
    
  • Basic Formula for double polarization experiment, (postscript) (html)
  • References for radiative correction, click here
  • References for extracting neutron from ³He, click here
    
    
  • Hall A survey reports, click here, postscript file for survey on 05/30/01 and 06/06/01
    
  • Beam polarization measurements, compton vs. moller, (.jpg), (postscript)
    Final report for Compton Measurement, click here, ( postscript)
  • Hall A Absolute beam energy measurements, click here
    
• Run Summaries
  • Scaler info for each run, left arm, right arm
  • Target polarization for each run, click here
  • Target status for each run, click here
  • Run comments from paper logbook, click here
  • List of commissionning runs, (arm, beam, target) =
    • delta, (left,IN,270) (right,IN,270)
    • elastic, (left,OUT,OUT) (left,OUT,IN) (left,IN,OUT) (left,IN,IN)
      (right,OUT,OUT) (right,OUT,IN) (right,IN,OUT) (right,IN,IN)
  • List of production runs, (arm, beam, target) =
    • x=0.61, (left,OUT,OUT) (left,OUT,IN) (left,IN,OUT) (left,IN,IN) (left,OUT,270) (left,IN,270)
      (right,OUT,OUT) (right,OUT,IN) (right,IN,OUT) (right,IN,IN) (right,OUT,270) (right,IN,270)
    • x=0.48, (left,OUT,OUT) (left,OUT,IN) (left,IN,OUT) (left,IN,IN) (left,OUT,270) (left,IN,270)
      (right,OUT,OUT) (right,OUT,IN) (right,IN,OUT) (right,IN,IN) (right,OUT,270) (right,IN,270)
    • x=0.33, (left,OUT,OUT) (left,OUT,IN) (left,IN,OUT) (left,IN,IN) (left,OUT,270) (left,IN,270)
      (right,OUT,OUT) (right,OUT,IN) (right,IN,OUT) (right,IN,IN) (right,OUT,270) (right,IN,270)
    • x=0.61, toggle mode (left,OUT,OUT) (left,IN,OUT) (left,IN,IN)
      (right,OUT,OUT) (right,IN,OUT) (right,IN,IN)
  • List of false asymmetry (12C) runs at x=0.48, (arm, helicity, target) =
    • x=0.61, (left,random,OUT) (left,random,IN) (left,toggle,OUT) (left,toggle,IN)
      (right,random,OUT) (right,random,IN) (right,toggle,OUT) (right,toggle,IN)
  • Run summary from halog  left arm   right arm
  
  
• For shift worker: -- On-line data analysis
  • On-line Data Analysis
  • Sample histograms for on-line detector checking ( L-arm) ( R-arm)
  
  
• Detector Efficiency.
  • Pion rejector connection records, (postscript) (html)
  • Gas cherenkov performance, (June 13, 2001 (halog)) (June 5, 2001)
  • Shower/Preshower calibration (June 13, 2001 (halog))
  • General performance of PID detectors during commissioning    Gas cherenkov (halog)    Pion rejector (halog)    Shower/Preshower (halog)
  
  

Taking Shifts

• Shift Sign-up    Shift Schedule    E97-103 Shift Schedule
  
• E99-117 runsheet  
• Hall-A Electronic Logbook
  
  
• For shift leader:   Run Plan(postscript) (html) (June 09, 2001)     Run Plan update (postscript) (html) (June 27, 2001)
• For target operator:    See target
• For 3rd person:    See data analysis
  
  
• For everyone:
  • How to become a TO
  • New DAQ
    Guide to data taking in Hall-A
    Running CODA on spectrometers and parity DAQ systems
    Hall-A trigger and data acquisition
  • Info About Work and Cache Disks in Hall A
  • Scaler data class package for hall A
  • Hall A Helicity Circuit
  
  
• Contact Information
  • People on shift (html) (postscript)
  • Offsite Polarized ³He People (html) (postscript)
  • Hall-A Staff

Technical Notes and Test Runs

• Technical Notes
  • Extracting Delta q/q from E99-117 g₁ⁿ/F₁ⁿ Data, Sept. 2004, (postscript,pdf)
  • Information of radiation length for polarized ³He target, ( html), ( postscript), C code to calculate radiation length: radlen.c
    
    
• Test Run Results
  • Pion rejection results from E99-117 DIS data (with high pion rate) (July, 2002, postscript html)
  • Further test result for PID detectors can be found at E99-117 detectors
  • Test Run for Detector PID efficiencies (using high e and rel. high pion rate runs) (Apr.20, 2001)   (Left arm   Right arm)     
  • Hall A Detectors PID efficiency analysis using E94104 data (Mar.26, 2001)  (postscript)   (html)
  • Oct-28-2000, for pion rejection efficiency of short Cerenkov detector. E=2.389 MeV, pL=pR=550MeV/c, angleL=angleR=60 deg. (postscript)   (html) (11/08/2000)
  • Oct-26-2000, for pion/electron ratio. The kinematics were chosen to be close to the real runs.
    
    • Analysis: #2 (postscript ) (html)(09/12/2000)      #1 (postscript) (html)(07/26/2000)
      
    • Software for estimating (e,e'), (e,pion) cross sections (10/22/2000) source code     instruction(html)
      

Publications and Plots

• Publications
  • E-print archive nucl-ex/0405006; Phys. Rev. C 70, 065207 (2004) ;
  • E-print archive nucl-ex/0308011; Phys. Rev. Lett. 92, 012004 (2004);
    • Jefferson Lab: Bringing the Nucleon into Sharper Focus.
      
    • CERN Courier: Jefferson Lab's journey into the nucleus.
    • APS -- Division of Nuclear Physics website, click here (broken link)
    • Physics Today: Spinning the nucleon into sharper focus.
    • Science Now article, click Quarks Know Their Left from Their Right
    • ScienceNews: Topsy Turvy: in neutrons and protons, quarks take wrong turns.
    • Physics New Update, click here (repost from JLab).
      
    • Wordpress: The thorn on the side of QCD (Sheldon Glashow about polarized proton-proton cross section)
      
    
    
  • About the first author: DOE Pulse
  
  
• Useful Plots
  • published results in PRL and PRC, and 11 GeV projected data, click here
  • lot of useful plots and cartoons, click here
  
  

Posters and Talks

• Posters
  • Small angle GDH poster   .ps.gz(small)   .ps.gz(large)   .jpg
  • A₁ⁿ poster   .ps.gz(small)   .ps.gz(large)   .pdf   .jpg
  • Polarized ³He poster ver. 2002   .ps.gz(small)   .ps.gz(large)   .pdf   .jpg
  • Polarized ³He poster ver. 2001   .ps   .jpg  all postscript subfiles  .tex files plots
  
  
  
• Talks
  • Neutron Spin Structure Experiments at JLab, DIS 2002, Piotr Zolnierczuk, April 30, 2002, Cracow    slides
  • A₁ⁿ, RHIC-SPIN weekly "spin discussion", Xiaochao Zheng, May 21, 2002, Upton, NY   RHIC-spin discussion news, archive,   transparancies
  • Spin physics using polarized ³He, Testing QCD via spin observables Wolfgang Korsch, April 19, 2002, Charlottesville, VA,  pdf,  postscript (password required)
  • A₁ⁿ, APS April meeting 2002, Xiaochao Zheng, April 23, 2002, Albequerque, NM   transparancies (password required)
  • Neutron spin at Jlab hall A, Pacific-Spin2001, Jian-Ping Chen, October, 2001, Proceedings,   (postscript),   to be published in the International Journal of Modern Physics A by World Scientific;
  • g₂ⁿ, DNP 2001, Wolfgang Korsch, October 19, 2001, Maui, Hawaii,   transparancies (password required)
  • A₁ⁿ, DNP 2001, Xiaochao Zheng, October 19, 2001, Maui, Hawaii,   transparancies (password required)
  • A₁ⁿ, MIT Lab. for Nuclear Science, DOE Review, Xiaochao Zheng, August 08, 2001, Cambridge, MA,   transparancies     xfig files (password required)

Related Thesis

• E99117 Thesis
  • "Precision Measurement of Neutron Spin Asymmetry A₁ⁿ at Large x_Bj Using CEBAF at 5.7 GeV", by Xiaochao Zheng, Massachusetts Institute of Technology (December, 2002) (password required). Click postscript  pdf for single spacing (234 pages), or postscript pdf for double spacing (276 pages, official version). We will have copies ready both at MIT and JLAB, please contact Xiaochao or Jian-Ping if you would like to have one mailed to you. New version avaialable (with hyper link enabled): A1n_6GeV_thesis.pdf
    
    
• E97103 Thesis
  • "The Search for Higher Twist Effects in the Neutron Spin Structure Function g₂ⁿ(x,Q²)", by , The College of William and Mary, (July 2003). Click here
    
    
    
• E94010 Thesis
  • "Measurement of the Neutron (³He) Spin Structure Functions at Low Q²: A Connection Between the Bjorken and Gerasimov-Drell-Hearn Sum Rule", by Pibero Djawotho, College of William and Mary (December 2002). Click here
    
  • "Etude Experimentale de la Structure en Spin du Neutron (³He) a Bas Q²: Une Connexion entre les Regles de Somme de Bjorken et Gerasimov-Drell-Hearn", by Alexandre Deur, Universite Blaise Pascal (9 Octobre 2000). Click here
    
  • " Measurement of the Neutron (³He) Spin Structure at Low Q² and the Extended Gerasimov-Drell-Hearn Sum Rule", by Ioannis Kominis, Princeton University (January 2001). Click here
    
  • "Measurement of the Neutron (³He) Spin Structure Function at Low Q²: A Connection Between the Bjorken and Drell-Hearn-Gerasimov Sum Rules", by John Steffen Jensen, California Institute of Technology (2000), Click here
    
  
  
• E155 Thesis SPIRES list
  • " Precision Measurement of the Spin Structure of the Proton and the Deuteron", by Frank R. Wesselmann, Old Dominion University, May 2000. 2 sided postscript , more paper-saving version
    
  • " Measurement of the Proton and Deuteron Spin Structure Functions g₁ and g₂", by William Alexander Tobias, Univ. of Virginia, January 2001. Click here
    
  
  
• E154 Thesis SPIRES list
  • " Measurement of the spin structure function g₂ for the neutron ", by David Reyna, The American University (1998), Click here
    
  • "A precision measurement of the neutron spin structure functions using a polarized ³He target ", by Todd Smith, The University of Michigan (1998), Click here
    
  • " Precision measurement of the neutron spin structure functions ", by Yury Kolomensky, University of Massachusetts, Amherst (1997), Click here
    
  • " Laser polarized ³He target used for a precision measurement of the neutron spin structure ", by Mikhail Romalis , Princeton University (1997), Click here
    
  
  
• E143 Thesis SPIRES list
  • " Measurement of spin structure function g₁ for the proton and the deuteron in the resonance region ", by Paul Raines , University of Pennsylvania (1996), Click here
    
    
• E142 Thesis SPIRES list
  • "The Precision Measurement of the Nuetron Spin Structure Function Using Polarized He-3 Target", by Xue-jun Wang , Syracuse University (1997), Click here (index only)
    
  • "Measurement of the Spin Structure Function of The Neutron G1(N) From Deep Inelastic Scattering of Polarized Electrons From Polarized Neutrons In He-3", by James A. Dunne , American University (1995), Click here (index only)
    
  • "A Study of the Spin Structure on the Neutron In Deep Inelastic Scattering of Polarized Electrons On Polarized Neutrons", by Michael S. Spengos , American University (1994), Click here (index only)
    
  • "A Determination of the Neutron Spin Structure Function", by David Michael Kawall , Stanford University & SLAC (1995), Click here(177 pp.)
    
  • "Measurement of the Neutron Spin Structure Function And Its Implications For QCD Sum Rules", by Jian-guo Xu , Syracuse University(1994), Click here (index only)
    
  • The Spin Structure of the Neutron Determined Using a Polarized He-3 Target", by Hunter Leigh Middleton , Princeton University (1994), Click here (index only)
    
  • SLAC E142: Measurement of the Spin Structure Function G1(n) (x) of the Neutron" (In French), by Yves Roblin , Clermont-Ferrand University(1995),
    
    
• E94-010 selected papers, Click here
  

(last updated: 02/03/2004, maintained by xiaochao@jlab.org)