MeV Mott Polarimetry at Jefferson Lab

Details MeV Mott Polarimetry at Jefferson Lab MeV Mott Polarimetry at Jefferson Lab

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..570..935s&link_type=abstract

The fourteenth international spin physics symposium, SPIN2000. AIP Conference Proceedings, Volume 570, pp. 935-942 (2001).

Physics

1

Electron Sources, Polarized Beams, Relativistic Electron And Positron Beams, Beam Analyzers, Beam Monitors, And Faraday Cups, Nuclear Orientation Devices

Scientific paper

In the recent past, Mott polarimetry has been employed only at low electron beam energies (~100 keV). Shortly after J. Sromicki demonstrated the first Mott scattering experiment on lead foils at 14 MeV (MAMI, 1994), a high energy Mott scattering polarimeter was developed at Thomas Jefferson National Accelerator Facility (5 MeV, 1995). An instrumental precision of 0.5% was achieved due to dramatic improvement in eliminating the background signal by means of collimation, shielding, time of flight and coincidence methods. Measurements for gold targets between 0.05 μm and 5 μm for electron energies between 2 and 8 MeV are presented. A model was developed to explain the depolarization effects in the target foils due to double scattering. The instrumental helicity correlated asymmetries were measured to smaller than 0.1%. .

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