Prototype of vacuum phototriode for SND detector
The design of prototype of vacuum phototriodes for SND detector is presented. Diameter of devise is 52 mm. The meshes pitch of 100 µm are used as anode. Multialkali or bialkali photocathodes of photodetectors will be adapted for NaI (Tl) crystals. It is supposed to increase the lifetime of the phototriodes for this dimensions.