HALL A Beam Polarimeters
Due to wide range of energy and intensity of incident polarized electron
beam being used for Hall A experiments,
two methods will be used to measure electron beam polarization in Hall A.
Moller Polarimeter
The first method is the Moller
scattering of the electron beam off electrons
in a thin magnetized iron target.
Moller polarimeters are mostly useful for
low to mediem energies and low beam intensity.
The Hall A
Moller Polarimeter has been built by an international
collaboration between University of Kentucky
and the Kharkov Institute of Physics and Technology in Ukraine. It
has been commsioned in 1997-1998.
Compton Polarimeter
The second method is the back-scattering of photons off the electron beam
(Compton scattering).
Compton polarimeters
are mostly useful for medium to high energies and high beam intensity.
The Hall A
Compton polarimeter
is being built by CEA/Saclay. It is expected to be ready
in 1998.
Return to the Hall A Home Page.
Last updated October 12, 1998
If you need more information on the Hall A beam polarimeters, please write to
jpchen@jlab.org or gen@jlab.org.