[Harry Nelson] [HEP People] [HEP] [Physics] [UCSB]

CLEO-II Silicon Vertex Detector

The CLEO-II silicon vertex detector is a particle detector, used to make very precise reconstruction of the trajectories of charged particles that are produced in electron-positron collisions. When complete, the device will be installed in the CESR electron-positron storage ring at Cornell University in Ithaca, New York.

The research for, design of, construction of, and exploitation of this device in particle physics research is the result of a collaboration of institutions including Caltech, Cornell, Harvard, Illinois, IPP, Oklahoma, OSU, Purdue, and UCSB. The device itself is under construction at UCSB. The UCSB team includes Kirk Arndt, Anton Eppich, Jeff Gronberg, Klaus Habermeier, Dave Hale, Chris Korte, Susanne Kyre, Rolly Morrison, Tim Nelson, Karl Runde, Hiro Tajima, and myself.

More information on the project can be found here .

Images

These are a schematic, and a parameter table, for the device:

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  Schematic of the detector.
  Click on the small image to get the larger image.
  
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  Parameter table for the detector.

An Octant

These are color photos of the first 1/8 of the device, known as an octant:

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  Octant Side View
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  Octant End View
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  Side View, Closer
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  Side View, Closer
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  Close up of Hybrid

Our colleagues at the Wilson Lab has taken data from the device in the pictures above, with cosmic ray muons. Here are displays of an event:

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  R-phi View, after clustering
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  Close up, prior to clustering, noise evident

Octants in the Clamshell

These are snapshots, taken on 12/9/94 and 12/12/94 with a polaroid camera, of the installation of octants into the supporting half-cylinder, known as the clamshell:

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  One can see the first octant, mounted on a holding fixture; the carbon fiber half-cylinder is above, and is affixed to a movable surface, which can be placed with precision of about 0.001". The half-cylinder is about to be lowered down on to the octant. When that is done, the octant will be fastened to the half-cylinder.
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  This picture shows Dave Hale at the controls as he lifts the half-cylinder, with octant now attached inside, up. Susanne Kyre is also shown.
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  Here, one is looking up into the half-cylinder, after a second octant has been installed. The silicon detectors, mounted on the greenish kevlar u-channels, as well as the white hybrids and brownish flex circuits are visible.
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  The three images above show 3 octants in the clamshell.
• The clamshell, with all 4 octants installed, was shipped to the Wilson Lab at Cornell, on December 19, 1994.