Compton polarimeter Electron detector upgrade and status

1
Compton polarimeterElectron detector upgrade
andstatus

• PREX/Happex
• Collaboration
• Meeting
• May 17th 2007
• Alexandre Camsonne

2
Electron detector

• 4 planes microstrip 128 strips
• Located about 5 mm from electron beam
• Detection of Compton electrons using 3rd dipole
  of the chicane as analyzer

3
Upgrade

• Mechanical
• New vertical motion system and accomodation of
  the new electronics
• Electronics
• Switch to 192 microstrips for improved resolution
  to reduce systematics
• DAQ
• Analysis

4
Mechanical design

• Design Clermont-Ferrand
• Complete
• Most parts in procurement
• http//clrwww.in2p3.fr/meca/plans/Site-web/Cebaf/T
  JN-DetE/TJN-DetE-P2.html
• Control motion
• Motor ordered
• Controls/interlocks to be developed

5
Mechanical design

• Integration JLab
• CAD drawings from Clermont Ferrand to check for
  interference
• Support stand design complete

6
Electronics

• Detectors strips at Clermont Ferrand
• 4 planes 192 strips
• Amplifier
• Design complete
• Being manufactured
• Complete testing to be done
• Trigger
• Work on board routing in process
• Design done 1 or 2 months
• Test card trigger done for test in July

7
DAQ

• Trigger and readout similar to previous detector
• Crl to be adapted
• Synchronization/integration with photon detector
  ( coincidence trigger)
• Work will start by spring 2008 when everything at
  JLab ( 2 months )

8
Analysis

• Reuse of Etienne Burtin, Stephanie Escoffie
  software
• Addition of David Lhuillier improvements
• Scaling of old software or rewriting of
  software ?

9
Man power

• Clermont
• Bernard Michel ( Electronics )
• Michel Brossard ( Physicist )
• Guy Savinel (?) ( Mechanical)
• Jefferson Laboratory
• Sue Witherspoon (EPICS Slow control)
• Alexandre Camsonne ( DAQ / Analysis)
• More people ?

10
Conclusion

• Mechanical design complete
• Progress on the electron detector electronics
• Final date for installation to be determined
• All components ready by end of 2007 ready for
  installation beginning 2008