Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2005-06-17
Nucl.Instrum.Meth.A562:327-337,2006
Physics
Nuclear Physics
Nuclear Experiment
23 pages, 13 figures
Scientific paper
10.1016/j.nima.2006.02.201
The CLAS detector will require improvements in its particle identification system to take advantage of the higher energies provided by the Jefferson Laboratory accelerator upgrade to 12 GeV. To this end, we have studied the timing characteristics of the micro-channel plate photo-multiplier 85001 from Burle, which can be operated in a high magnetic field environment. For reference and comparison, measurements were also made using the standard PMT R2083 from Hamamatsu using two timing methods. The cosmic ray method, which utilizes three identical scintillating counters 2cmx3cmx50cm with PMs at the ends, yields 59.1(0.7)ps. The location method of particles from radiative source with known coordiantes has been used to compare timing resolutions of R2083 and Burle-85001.This ``coordinate method'' requires only one counter instrumented with two PMs and it yields 59.5(0.7)ps. For the micro-channel plate photomultiplier from Burle with an external amplification of 10 to the signals, the coordinate method yields 130(4)ps. This method also makes it possible to estimate the number of primary photo-electrons.
Baturin Vitaly
Burkert Volker
Kim Woongnae
Majewsky S.
Nekrasov D.
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