Author/Authors :
Veloso، نويسنده , , J.F.C.A. and Amaro، نويسنده , , F.D. and Azevedo، نويسنده , , C.D.R. and dos Santos، نويسنده , , J.M.F. and Breskin، نويسنده , , A. and Lyashenko، نويسنده , , A. and Chechik، نويسنده , , R.، نويسنده ,
Abstract :
We present the Photon-Assisted Cascaded Electron Multiplier (PACEM) as a potential alternative for ion back-flow suppression in gaseous cascade electron multipliers. Using a Micro Hole and Strip Plate–Gas Electron Multiplier (MHSP-GEM) configuration, the number of ions flowing back to the scintillation region is about 1.5 ions per primary electron at an optical gain of 6.5 and a drift field of 0.1 kV/cm, and about 10 ions per primary electron at an optical gain of 10 and a drift field of 0.5 kV/cm. These allow reaching ion back-flow values close to 10−4 and 10−5 at typical operation conditions of TPCs and GPMs, respectively.
Keywords :
Gaseous electron multipliers , GEM , MHSP , VUV scintillation , Gaseous photomultipliers , Photocathodes
