Author/Authors :
Kim، نويسنده , , H.C. and Bahk، نويسنده , , S.Y. and Hong، نويسنده , , B. and Hong، نويسنده , , S.J. and Hu، نويسنده , , R.J. and Jo، نويسنده , , M.H and Kim، نويسنده , , C. and Kim، نويسنده , , Y.J. and Kim، نويسنده , , Y.U. and Lee، نويسنده , , K.S. and Lee، نويسنده , , S.J. and Nam، نويسنده , , S.K. and Park، نويسنده , , S.K and Rhee، نويسنده , , H.B. and Rhee، نويسنده , , J.T. and Sim، نويسنده , , K.S.، نويسنده ,
Abstract :
A systematic study with a series of irradiation tests was performed for the forward resistive plate chambers (RPCs) of the Compact Muon Solenoid (CMS) in the Large Hadron Collider (LHC) experiment. Small double-gap RPCs were manufactured and tested by the gamma rays emitted from a 200 mCi 137Cs source at Korea University and by the fast neutrons provided by the MC50 proton cyclotron at the Korea Institute Radiological and Medical Science (KIRAMS). We found no significant symptom of aging in the performance of the prototype RPCs, as a consequence of the neutron irradiation, whose total equivalent dose was approximately 45 Gy. However, a fast degradation was observed in the RPCs when the gamma signal rates were higher than 3 kHz cm − 2 . Furthermore, we observed from the chemical analysis for the RPC electrode that the long-term performance of the RPCs was stable in spite of absorbing the high-level fluorine when the signal rates were lower than 2 kHz cm − 2 .
Keywords :
gamma irradiation , Neutron irradiation , Compact muon solenoid , Large hadron collider , Muon trigger detector , Aging effect
