CDC
Up to Charged Particle Tracking
Contents
- 1 The GlueX Central Drift Chamber
- 2 CDC Construction
- 3 CDC Documentation
- 4 CDC Bi-weekly Status Reports
- 5 Photographs of the old CDC Prototype
- 6 Tracking
- 7 Wire tension measurement
- 8 Electronics
- 9 New prototype
- 10 Straw irradiation test
- 11 Prototype simulations
- 12 Mechanical tests
- 13 March 2008: PID/tracking review
- 14 Electrical Hookup tests
- 15 Endplate Layout
- 16 Straws
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 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.
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 All older documents should be considered out of date and probably inaccurate.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
- ) Gary Wilkin wilkin@ernest.phys.cmu.edu
CDC Construction
- CDC Fabrication Readiness Review (Pittsburg, XX XX, 2010)
- Submitted Documents
- The documentation provided by CMU to Jefferson Lab as part of the CMU Contract Submission.
- Production Documents
CDC Documentation
- ) GlueX-doc-990 The GlueX Central Drift Chamber
- ) GlueX-doc-979 The CDC Design Layout
- ) GlueX-doc-1079 The CDC ASIC for GlueX
- ) GlueX-doc-1243 Gas Flow in the CDC
CDC Bi-weekly Status Reports
Photographs of the old CDC Prototype
Photographs of the CDC Prototype
Tracking
Wire tension measurement
Document describing the measurement
Electronics
Measuring Fe-55 X-rays with %2 interposer board
ASIC design optimizations tests writeup
New prototype
We are planning to produce one or more smaller prototypes of the CDC to test in magnetic fields/test beams.
Planned mechanical/construction tests
Straw irradiation test
Inspection with an electron microscope
Inspection with an electron microscope II
Inspection with an optical microscope
LAMINA thin Al not radiated - optical microscope
Prototype simulations
dE/dx 350 MeV pions/koans/protons
Mechanical tests
With the cooperation of Tim and Slava we plan to do a couple of mechanical tests. During the review it was mentioned that we need to do more of these tests.
Measure the thickness of the Al inside the straw
Sag, compression, and twist test
March 2008: PID/tracking review
GlueX CDC design and construction
GlueX CDC design and construction talk
