CDC

The GlueX Central Drift Chamber

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 30% 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 1.6cm diameter straws are arranged in 24 radial layers. The inner-most layer is at about 10cm and the outermost is at about 55cm 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.

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 All older documents should be considered out of date and probably inaccurate.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: