Difference between revisions of "CDC"
(→Electrical Hookup tests) |
(→Electrical Hookup tests) |
||
| Line 134: | Line 134: | ||
== Electrical Hookup tests == | == Electrical Hookup tests == | ||
| − | + | [CDC Electrical Hook Up Photos] | |
| − | [ | + | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
== Endplate Layout == | == Endplate Layout == | ||
Revision as of 09:28, 6 May 2009
Up to Charged Particle Tracking
Contents
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 1.6 cm diameter straws are arranged in 24 radial layers. The inner-most layer is at about 10 cm and the outermost is at about 55 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 All older documents should be considered out of date and probably inaccurate.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 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
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
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
Electrical Hookup tests
[CDC Electrical Hook Up Photos]
Endplate Layout
Straws
We have tried to compare the gravitational sag of three identical lengths of the straw material. The Lumina mylar straw, the Stone Kapton straw and the Euclid mylar straw. With the straws supported at both ends, the is slightly more sag in the kapton than either of the mylar straws (pictures above, but very hard to see).
With the straws supported it at one end, the katon straw sags about 2cm below where either of the mylar straws are.
