A Proposal for Calibration and Testing of a Transition Radiation Detector for Space Applications Page: 2 of 3
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The TRDs being developed are scheduled to fly on the Advanced Cosmic
ray Composition Experiment (ACCESS) for the International Space Station,
which is scheduled for launch in 2006. A more detailed description of the sci-
entific goals can be found at http://hep.uchicago.edu/~swordy/access.html,
The more technical aspects of ACCESS are discussed at
http://www70l.gsfc.nasa.gov/access/access.htm. As a precursor to the AC-
CESS mission we are also planning fly these TRDs on long duration high alti-
tude balloon payloads. These are TRACER, described at
http://uchuusen.uchicago.edu and CREAM discussed in
http://cream.phys.psu.edu. All of these payloads are directed toward the de-
termination of cosmic ray elemental composition at high energy.
3 Proposed Beam Setup
The proposed beamline setup for this calibration is shown in Figure 1. As
discussed above, a beam momentum range of 100-500GV would be ideal for
these tests. The particle beam momentum definition requirements are rela-
tively loose, a knowledge of the momentum to an accuracy of ~5% wil be
adequate for the calibration. Beam collimation at the TRD should produce a
spot size of diameter ~10cm. During the beam spill the particle rates at the
TRD should be fairly low, less than 1000 events/second.
After the momentum definition and focussing the beam passes through a gas
Cherenkov detector, hopefully provided by FNAL. Ideally this is capable of
being filled with He or N2. The beam defining counters sl and s2 will be
provided by the University of Chicago (UC) as will the TRD apparatus and a
small electron tagging calorimeter downstream of the TRD. If possible, it will
be of great help to have a relatively large absorber (~1000g/cm2 concrete)
downstream of the setup for identification of muons via the counter s3 (UC
provided). The basic tagging scheme is outlined in table 1.
The physical dimensions of the beam setup area are not large. About 3m along
the beam direction are required for sl, s2, TRD and the EM calorimeter. Per-
pendicular to the beam a distance of about 50cm each side provides adequate
clearance. The other components shown in Figure 1 will depend on the specific
area and devices used.
A summary of the desired beam properties is given in table 2. This calibration
can also be run with a subset of the desired particles and a smaller range of
particle momenta. It will simply sample fewer places on the response curve.
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Swordy, Simon P. A Proposal for Calibration and Testing of a Transition Radiation Detector for Space Applications, report, January 1, 1999; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1013451/m1/2/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.