Author/Authors :
Acosta، نويسنده , , D. and Klimenko، نويسنده , , S. and Konigsberg، نويسنده , , J. and Korytov، نويسنده , , A. and Mitselmakher، نويسنده , , G. and Nguyele، نويسنده , , A. and Nomerotski، نويسنده , , Maria A. and Safonov، نويسنده , , A. and Stanek، نويسنده , , R. and Tsybychev، نويسنده , , D. and Vidal، نويسنده , , R. and Wang، نويسنده , , Terence S.M. and Wong، نويسنده , , M.، نويسنده ,
Abstract :
We have built a novel device for precision measurements of luminosity in the CDF experiment at the high pp̄ 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 pp̄ 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 2×1032 cm−2 s−1 with six interactions per bunch crossing, on average, and respond to a 132 ns bunch spacing.
