updated May 26, 2017

PREX-II To-Do List

Here is a list of things to do to get ready for
a PREX run.  

For CREX, see the CREX todo list.

I. Radiation Shielding

-- Responsible:  Kent, Ciprian, Rakitha, Robin
-- Water-cooled tungsten plug
-- Need full design of external shielding.   status:   nearly complete, need review

II. Vacuum / coupling to HRS

-- Kent, Bob, Rakitha
-- Design of vacuum box and sieve
-- Q1 Collimator -- Prelim. design by Nickie Saylor

III. Septum

-- Will need new coils.  Can re-use iron.   status:   coils purchased for PREX, but need another set for C-REX 
-- Will run 3-coil config, to accomodate C-REX.
-- Develop tuning procedure.  Seamus

IV. Compton Polarimeter

-- Laser Polarization:  Kent
-- Laser and photon detector basically ready:  Dave 
-- Manpower revitalized
-- Upgrades of counting DAQ and E-det
-- The upgrades of the counting DAQ and E-det are not needed for PREX.

V. Moller Polarimeter

-- Restore the high-field Moller: Jim Napolitano
-- Electron optics systematics (Geant and data disagree on acceptance): Jim
-- Cryogenics upgrade.    status:   new magnet and cryo upgrade purchased
-- Custom FADC DAQ needs more work

VI. Parity DAQ

-- Restore the DAQ : Bob and Tyler
-- Use Qweak ADCs with HAPPEX ADCs as a backup.

VII. Detectors

-- Quartz detectors.  Use Dustin's design.
-- Linearity studies to improve the limits.
-- GEMs foreseen.

XIII. SAM   (Lumi) 

-- Redesign : Dustin   status:   done, installed

IX. Targets

-- Silviu is responsible, with target group.
-- Order isotopically pure Lead.   status:   10 foils procured
-- Order diamond foils   status:   30 foils purchased 
-- PREX and CREX to share one target chamber and run back-to-back.

X. Raster Sync

-- Agilent function generators procured and incorporated.  
-- Commissioning Tests :  Bob