Conceptual drawing of the polarized target for CLAS. For an enlarged view and other pictures go to our picture gallery.

The EG1 Running Group within the CLAS collaboration comprises 4 experiments that use polarized electron or photon beam and polarized targets (H or D):

• Experiment E91-015 will measure the helicity structure of pion photoproduction and contribute to the world's data on the Gerasimov-Drell-Hearn sum rule.
• Experiment E91-023 will measure polarized structure functions of the proton at low to moderate Q² and in the resonance region.
• Experiment E93-009 will measure polarized structure functions of the deuteron in the same kinematic region as E91-023. These two experiments together will explore the Q²-dependence of the Gerasimov-Drell-Hearn sum rule for protons and neutrons.
• Experiment E93-036 will measure the helicity structure of single pion electroproduction, which is one of the dominant channels contributing to the inclusive polarized structure functions measured in E91-023.

Subscribe to the EG1_RUN email list!
Send message to all EG1 collaborators.
 

24-Dec-98 The first part of the EG1 runing period has been completed, with plenty of good (we hope) data on the proton and some on the deuteron. Looking forward to the next run...

EG1 Analysis

Technical drawings

Upcoming Meeting(s):

• We have weekly meetings every Thursday 10:30 in B101 CEBAF Center. These meetings alternate on a semi-regular schedule (every other week) between
• EG1 analysis meetings to organize the analysis effort, present preliminary results etc.. These meetings are announced via the EG1 mailing list (see above) and can be attended from off-site via phone conference. Please contact Volker Burkert if you want to be included as an off-site participant.
• prepare for the next run in 2000, especially organize and plan the work on the polarized target. Announcements, agendas and minutes for these meetings are sent only to people who work on or are particularly interested in the polarized target. If you are interested to join that group, please send me an email message (I make no promises, though).

Minutes of previous meetings

• EG1 collaboration meeting September 11, 1998
• EG1 collaboration meeting June 4, 1998
• EG1 collaboration meeting April 24, 1998
• EG1 collaboration meeting Friday, February 6, 1998
• EG1 meeting on Sunday, 1/11/1998.
• Minutes of Polarized Target meetings Dec 1997
• Minutes of Polarized Target meetings Sep - Nov 1997
• Write-up about Particle Trajectories in the Target B-field (following discussion at the March 5 '98 target meeting)

Additional Links of Interest for EG1 collaborators:

• Preliminary Analysis Results (only for collaboration members - secure Website)
• Alexander Skabelin's Analysis Homepage
• Preliminary list of thesis students on EG1
• EG1 Email distribution list and archive
• Memo about optimal beam helicity scheme
• Discussion of the optimal Background target material to correct for Dilution
• Annotated target stick photos
• Raffaela Devita's page on the target stick.
• Target stick postscript files: 1,2, 3, 4, 5
• Angela Biselli's Homepage with description of her incorporation of the Polarized Target field into GSIM.
• Count rate calculations
• Estimated error bars
• Existing data from E143 on the Q2-evolution of the Ellis-Jaffe Integrals: JPEG and Postscript.
• Write-up of S. Kuhn's HUGS97 lecture series on DIS structure functions (Read me file)

Return to the Hall B Website.