Author/Authors :
Park، نويسنده , , S. and Ahn، نويسنده , , S.H. and Bahk، نويسنده , , S.Y. and Hong، نويسنده , , B. and Hong، نويسنده , , S.J. and Kang، نويسنده , , D.H. and Kang، نويسنده , , T.I. and Kim، نويسنده , , T.J. and Kim، نويسنده , , Y.J. and Kim، نويسنده , , Y.U. and Koo، نويسنده , , D.G. and Lee، نويسنده , , H.W. and Lee، نويسنده , , K.S. and Lee، نويسنده , , Kojo S.J. and Lim، نويسنده , , J.K. and Moon، نويسنده , , D.H. and Nam، نويسنده , , S.K and Oh، نويسنده , , J.K. and P، نويسنده ,
Abstract :
The Compact Muon Solenoid (CMS) forward resistivity plate chambers (RPCs) at the high eta region must be operated in presence of a radiation-induced rate as high as 1 kHz / cm 2 . It is still unknown if the RPCs coated with linseed oil can be operated under such a high-radiation environment over the lifetime of CMS. Non-oiled RPCs may be one of the options since phenolic or melamine-coated bakelite is chemically stabler than linseed oil. We have constructed oiled and non-oiled RPCs at the high eta region of CMS using phenolic bakelite and tested them in the Gamma Irradiation Facility at CERN. While both RPCs show the same characteristics in the efficiency and the strip multiplicity, the non-oiled RPC generates an intrinsic noise rate of 50 Hz / cm 2 , compared to only 5 Hz / cm 2 for the oiled RPC, both at 10.0 kV which is about 100 V above the 95 % knee of the efficiency curve.
Keywords :
Non-oiled RPC , Oiled RPC , Melamine , CMS , LHC , phenolic
