²⁰⁸Pb   Radius   Experiment   PREX

This file: hallaweb.jlab.org/parity/prex 

quick links:   SHIFT SIGNUP(pw: "leadradius")    Hall A    HALOG   HAPPEX   HAPLOG

For Run Info,   see the Wiki:   prex.jlab.org

Spokespersons:   Krishna Kumar (U. Mass),   Paul Souder (Syracuse),   Robert Michaels (JLab),   Guido Urciuoli (INFN).

PROPOSAL   and   UPDATES

• 2005 Proposal Update (Postscript), and   Same, PDF.
• 2002 Proposal Update
• Original Proposal (Dec 1999).

PREX   PHYSICS   INFO

• Paper on Parity Violating Neutron Densities (PDF)   and same (PS)   published in   Phys. Rev. C63, 025501 (2001).   Cited 120 times according to SPIRES (Jan 2010).
• 1-Page Experiment Summary for the Public   Postscript   or   PDF
• EINN 2005 Poster about PREX (powerpoint).
• References from C. Horowitz .
• The 2009 PREX workshop at Trento, Italy.
• The 2008 PREX workshop
  • List of 2008 PREX Workshop talks .
  • Here is C. Horowitz's page on the workshop.
• The Trento 2000 Workshop on Parity Violation.

STATUS   and   PLANS

• The Global Run Plan   and   Daily Run Plan for the upcoming run   (new)
• Safety documents.
• A shutdown work list for the Jan 2010 shutdown.
• A work list   (updated May, 2009)   which supercedes Paul Souder's old work list .
• A document describing the Beam Requirements
• Local meetings to prepare for experiment. We meet each Monday at 3 pm.
  • Feb 19-20 Collab. Mtg.
  • Feb 8, 2010 meeting
  • Jan 25, 2010 meeting
  • Jan 18, 2010 meeting
  • Jan 11, 2010 meeting
  • Jan 4, 2010 meeting
• A somewhat older index of Meeting Minutes and Talks
• Working on a new Monte Carlo.   And here are rate estimates.
• Here is Paul's note on slits for transverse asymmetry systematic (March, 2009).
• 18-bit ADCs
  • Specification of the 18-bit ADCs.
  • Performance Report.
  • File list of circuit diagrams   and other files.
  • schematic from Fernando Barbosa.
• Septum
  • Here is a report on field measurements from J. Gomez.
  • Here is a Test plan for Septum magnet to be done in Nov 2009 .
  • Some drawings of the 5 degree septum   courtesy M. Hodges.   See also sept*.pdf in   pics
• Cavity Monitors
  • Low-current cavities:   written report   and   meeting talk.
  • Update from 2007 :   meeting talk
  • Lisa Kaufmann's 2005 report.   Note, the problems were fixed with the new receiver electronics.
• Collimator
  • A procedure to align the collimator.
  • Overview of collimator to put in the mouth of Q1.
  • Some specs for collimator to help engineer it.
  • Possible way to stop 2-bounce photons
  • The specification to taper the sides to reduce slit scattering.
• Target Info
  • Oct 2009   Target Ladder:
    • During the   optics and calibration phase
    • During the   production mode
    • Target list inclu. operational restrictions.
  • (Old) Target info for the Jan 2008 test run.
  • Here are Design Drawings from J. Miller .   And here are assembly pics (was for the Jan 2008 test run)
  • Early tests Pb target.   See diagram of target   and   writeup about test (postscript)   and same, PDF
• Q² Measurements
  • Report from 2005 run of HAPPEX.
  • Report from 2004 run.
  • Report from 1998-1999 run.
• Polarimetry
  • Here is an Status Update on the new DAQ (Dec 29, 2009) for Moller based on a FADC.
  • In 2003 JLab held a Polarimetry Workshop
  • There is an idea to use atomic hydrogen polarimetry.
  • Here is a draft of plans to upgrade   the   Compton polarimeter.
• In Nov 2005 we had a 2 day run to test all aspects of the experiment at ~850 MeV.   Results were explained in the 2005 propsal update (see talks, below).

TALKS   and   MEETINGS

• Meetings
  • 2010 Run   Run-related meetings
  • Collaboration Meetings
  • older stuff.
• Talks about PREX   including seminars and PAC Defenses
• The PREX Beam Requirements
• Here was the recent PREX workshop 2008 held at JLAB.
• Here are some old transparencies .

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  maintained by   Robert Michaels      rom@jlab.org   last updated 5-Feb-2010