科研之友
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摘要
An MRPC prototype for the future CBM-TOF inner area has been developed. The counter assembled with low resistive glass consists of 10x0.22 mm gas gaps and 2x8 readout pads. The size of each pad is 20 mmx20 mm with an interval of 2 mm between pads. The signals of the counter are collected by 4 eight-pin connectors. Preliminary tests performed with cosmic-rays showed an efficiency over 98% and a time resolution around 60 ps. The measured crosstalk, dark current and dark rate were at a very low levels. Results under uniform irradiation performed at JINR with high energy deuteron showed a time resolution of 40-50 ps and over 98% efficiency at a low flux rate, meanwhile at a flux up to 70 kHz/cm(2), 93% efficiency and 77 ps time resolution still remained. These excellent performances call fully meet the demand of CBM-TOF inner wall.
