We have built a novel device for precision measurements of
luminosity in the CDF experiment at the high p anti-p collision rates expected
during Run II. The detector consists of long, conical, gaseous Cherenkov
counters that point to the collision region and monitor the average number
of inelastic p anti-p interactions by measuring the number of particles, and
their arrival time, in each bunch crossing. For these primary particles,
using isobutane at atmospheric pressure as a radiator, a large amount of
Cherenkov light (~ 100 photoelectrons) will be collected, with good
amplitude and time resolutions, onto small and efficient PMTs. Suitable
amplitude thresholds will be applied to discriminate from non-primary
particles and other backgrounds which yield little light in the counters.
This detector is expected to reliably perform bunch-by-bunch luminosity
measurements at peak instantaneous luminosities of 2 x 1032 cm-2 s1 with
six interactions per bunch crossing, on average, and respond to a 132 ns
bunch spacing.
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Updated: Wednesday, 2001 March 07 10:44:55 CST automatically from input from Carol Picciolo