The Time-of-Flight System for CLAS Page: 4 of 52
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The TOF system is also used for energy-loss measurements and velocity-de-
termination in specific instances. Pulse-height information, being proportional
to the energy loss in the counter, provides an independent means for the iden-
tification for slow particles. Also, the flight time can provide a more accurate
measurement of particle energy than magnetic analysis for slow particles when
the tracking resolution is dominated by multiple scattering. The momentum
of 500 MeV/c protons can be determined with comparable uncertainty using
either time-of-flight or magnetic analysis. If neutrons interact in the counters
(efficiency 5%), their energies can only be determined by time-of-flight.
The system must also be capable of operating in a high-rate environment. The
maximum counting rate in an electron beam occurs in the forward direction
Large-angle Calorimeter
Drift Chambers Electromagnetic Calorimeter
Region 1
gion 2
gion 3
1 m
TOF Counte Cherenkov Counters
Fig. 1. Midplane slice of the CLAS detection system (plan view). The Cherenkov
counters and the electromagnetic calorimeter extend to 450. The electron beam is
incident from the left.4
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Smith, E. S.; Carstens, T. & Distelbrink, J. The Time-of-Flight System for CLAS, article, February 1, 1999; Newport News, Virginia. (https://digital.library.unt.edu/ark:/67531/metadc712295/m1/4/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.