Pixel Vacuum System Status

OCTOBER, 2003

The pixel detector will be located in the machine vacuum of the Tevatron. In order to determine the vacuum pumping requirements, a mechanical model of a number of pixel planes was constructed using most of the materials and construction methods envisioned for the final system. Measurements made using this "5%" model show that a suitable vacuum can be obtained if a combination of cryogenic panels using liquid nitrogen and cryogenic pumps using liquid nitrogen and helium are used.

APRIL, 2002

The design is moving back toward three separate vacuums, one for the beam and two for the pixel detector, one for each half-plane. Only a thin membrane (150 to 250 micron aluminum) is planned to separate the detector and beam vacuums. We have started to make simple prototypes of thin rf-shield membranes. The need for this separate set of vacuum regions is based on expectations for out-gassing in the full pixel detector. A 10% test of these expectations is being prepared now.

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