[PEPPo] RC Daily Report

[Arne Freyberger]

Production running is completed as of Noon on Sunday June 24th. 
Systematic studies aimed at understanding/measuring the positron beam 
characteristics  commenced Sunday afternoon and ran through to Monday 
Morning.

We will have a 3:30pm meeting to discuss the path forward.     Here are 
some of the open issues:

 1. Positron  Energy profile, the  round scintillator gave a response
    that was dependent on the incident position.
     1. Change to a rectangular scintillator :   Use the three cosmic
        paddles
     2. Change to a rectangular scintillator: fabricate one
     3. Both 1 and 2 are in progress......
 2. Positron Position Profile: Fiber Array  measurements showed a static
    distribution with respect to beam energy, solenoid settings.   Need
    to establish if this device is measuring signal or just background
     1. Desire more beam time (1 to 2 hours) to check with electron beam
 3. Positron bunch length:  TDC and trigger  yields a value of 1.3nsec. 
    Even for electron beam.
     1. punt on this.
 4. Mott measurements:  Originally on the schedule, may be deferred for
    a day.

Please come to the 3:30pm meeting in MCC  for what looks to be  a 
healthy discussion.

Cheers,
Arne

-- 
Arne Freyberger
Director of Accelerator Operations
Jefferson Lab           Office: (757) 269-6268
12000 Jefferson Avenue  Cell:   (757) 876-6289
Newport News, VA 23606  Email:  freyberg at jlab.org

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