Physics – Instrumentation and Detectors
Scientific paper
2009-07-17
Nucl.Instrum.Meth.A604:310-313,2009
Physics
Instrumentation and Detectors
9 figures, Presented in The 8th International Conference on Position Sensitive Detectors (PSD 2008)
Scientific paper
10.1016/j.nima.2009.01.106
In this paper we would like to present a few characteristics of the Resistive Plate Chambers (RPC) made of a particular grade of bakelite paper laminates (P-120, NEMA LI-1989 Grade XXX), produced and commercially available in India. This particular grade is used for high voltage insulation in humid conditions. The chambers are tested with cosmic rays in the streamer mode using argon, tetrafluroethane and isobutane in 34:59:7 mixing ratio. In the first set of detectors made with such grade, a thin coating of silicone fluid on the inner surfaces of the bakelite was found to be necessary for operation of the detector. Those silicone coated RPCs were found to give satisfactory performance with stable efficiency of >90% continuously for a long period as reported earlier. Results of the crosstalk measurement of these silicone coated RPC will be presented in this paper. Very recently RPCs made with the same grade of bakelite but having better surface finish, are found to give equivalent performance even without any coating inside. Preliminary results of this type of RPCs are also being presented.
Bhattacharya Sailajananda
Biswas Santidan
Bose Sangita
Chattopadhyay Surajit
Saha Surajit
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