The experiment E99-117 was proposed to measure the neutron spin asymmetry
in inclusive deep inelastic electron scattering at 6 GeV for three
kinematics:
at
. Available models
give different predictions for the high
behavior of
, most of
which predict that
to be large and positive as
. While
all existing data do not yet exhibit this behavior for
, this
measurement should clarify the high
behavior of
and therefore
will provide nontrivial experimental support for understanding spin
structure of the nucleon.
The experiment will use an 80% polarized electron beam with current 15
and the beam energy 6 GeV. The target is polarized
He gas cell.
Typical target pressure is 10 atm and polarization is 40%. During
measurement the target will be polarized either parallel or perpendicular
to the electron beam, such that
can be extracted from the measured
asymmetries
and
. The two Hall-A high resolution
spectrometers will be used in a single mode independent of each other.
The major goal of this run plan is to allocate beam time to different
kinematics and different polarization such that the statistical error of
each kinematics is minimized to the same level. Electron rates are estimated
in section 2, as well as pion and positron backgrounds. Positron runs are
found to be necessary. In section 3 all commissionings and other
measurements are listed. Finally the overall run plan is summarized in
section 4.