Author/Authors :
Masuda، نويسنده , , T. and Iwai، نويسنده , , E. and Kawasaki، نويسنده , , N. and Kim، نويسنده , , E.J. and Komatsubara، نويسنده , , Kathy T.K. and Lee، نويسنده , , J.W. and Lim، نويسنده , , G.Y. and Maeda، نويسنده , , Y. and Naito، نويسنده , , D. and Nanjo، نويسنده , , H. and Nomura، نويسنده , , T. and Ri، نويسنده , , Y.D. and Sasao، نويسنده , , N. and Sato، نويسنده , , K. and Seki، نويسنده , , S. and Shiomi، نويسنده , , K. and Sugiyama، نويسنده , , Y. and Togawa، نويسنده , , M. and Watanabe، نويسنده , , H. and Yamanaka، نويسنده , , T.، نويسنده ,
Abstract :
We developed a high voltage system for the electromagnetic calorimeter of the KOTO detector. The system is designed around a low noise, low power Cockcroft–Walton (CW) photomultiplier tube base with a high gain preamplifier. The low power makes it suitable for operations in vacuum. The low noise and high gain allow detecting signals in the 1 MeV range. We achieved a final noise level below 180 μ V rms for a preamplifier gain of more than 40. A vacuum tolerant control system for the CW bases power distribution was also designed. This system is able to control and monitor the high voltage of each individual base.
Keywords :
J-PARC , KOTO , Calorimeter , CW base , Photomultiplier tube
