CDC Overview
The GlueX CDC
Overview
The CDC is a straw tube chamber that sits around the target in the
GlueX experiment. The straws nominally run parallel to the beamline
with readout on the upstream end of the chamber. About half of the straws
are tilted with a 6 degree stereo angle to provide a measurement of the
z position in two regions along the track. Tracks going more forward than
about 30 degrees will also be tracked by the forward drift chamber system
in the GlueX detector (FDC).
The 1.6 cm diameter straws are arranged in 28 radial layers. The inner-most
layer is at about 10 cm and the outermost is at about 57 cm from the beamline.
The chamber is anticipated to achieve a 150 micron position resolution in
the r-phi plane, which when conbined with the stereo information will yield
a number of z measurements with resolution of about a mm.
Row#......Straw#............Orientaion
1 42 A 2 42 A 3 54 A 4 54 A 5 66 -S 6 66 -S 7 80 -S 8 80 -S 9 93 S 10 93 S 11 106 S 12 106 S 13 123 A 14 123 A 15 135 A 16 135 A 17 146 -S 18 146 -S 19 158 -S 20 158 -S 21 170 S 22 170 S 23 182 S 24 182 S 25 197 A 26 197 A 27 209 A 28 209 A
sum 3522
The most up-to-date description of the CDC is found in GlueX-document 990
which can be found on the portal http://portal.gluex.org . There are also
up-to-date geometry tables in GlueX-document 979. There were also
changes to this design that have been documents in GlueX-doc 744 and in
document number 764 is the budget justification information for the chamber.
All older documents should be considered out of date and probably inaccurate.
General information on charged particle tracking in Hall-D can be found on the Charged Particle Tracking wiki page.
The CDC is being built by the Medium Energy Physics group at Carnegie Mellon University http://www.cmu.edu . The current members of the CMU group involved in this effort are:
- ) Curtis A. Meyer cmeyer@ernest.phys.cmu.edu
- ) Gregg Franklin gbfranklin@cmu.edu
- ) Yves Van Haarlem yvhaarle@ernest.phys.cmu.edu
- ) Naomi Jarvis nsj@cmu.edu
- ) Gary Wilkin wilkin@ernest.phys.cmu.edu