Relative Alignment System
The inner tracking system of CDF for Run-2 consists of silicon detectors to identify B mesons from their finite path length (~0.5 mm) before they decay. Identifying the bottom mesons is essential to following up CDF's discovery of the top quark and to CDF's upcoming discovery of CP violation with b quarks. These tracking detectors need to achieve a resolution on the order of 10-20 microns.
UCLA is building a relative alignment
monitor called RASNIK
Alignment System of NIKhef") for the CDF tracking detectors. This is an
inexpensive system that was invented by NIKHEF
Amsterdam. It is an optical device, but does not use lasers, only an infrared
light-source, a mask, convex lens and CCD camera, as shown below,
The projector, which contains the lens, coded mask, and LED, next to
a penny and bus token.
Go find out about the Radiation Tests.
Download an actual coded mask. (500kB). You probably need to print it out to see the detail.
Go back to UCLA-CDF homepage.