Jefferson Lab
Hall B
CEBAF Large Acceptance Spectrometer
(CLAS)
|
The bulk of my research efforts are focused at the
Thomas Jefferson National Accelerator Facility
(Jefferson Lab) and primarily in Hall B which houses the CEBAF Large
Acceptance Spectrometer (CLAS). During the period of my postdoc position
I was heavily involved with the design and construction of the
Region 2
drift chambers for CLAS. Data taking with CLAS began in the fall 1997
and is now being analyzed by an army of researchers.
The CLAS is based around six-super-conducting coils which generate a
large toroidal magnetic field
for momentum analyzing charged particles.
A central component of the CLAS are the eighteen drift chambers---three
layers of six---that provide charged particle tracking from the target
region to the outer layers of the spectrometer. The six Region 1 drift
chambers---constructed by Carnegie-Mellon
University, the University of Pittsburgh, and the University of
Massachusetts---are nearest to the target
and fit inside the bore of the cryostats containing the super-conducting
coils.
The Region 3 drift chambers were constructed at Jefferson Lab and are
located outside of the cryostats. The Region 2 drift chambers were
constructed at Old Dominion University with technical support provided
by Jefferson Lab.
The Region 2 detectors are located between the
coils and therefore operate in a region of large magnetic fields.
The six Region 2 drift chambers each resemble a wedge of a cantaloupe
with endplates forming the sides of the wedge and wires running between
the endplates. The chambers are approximately 4.4 m in length, 40 cm thick
radially, and 2.0 m wide at the widest point.
|
