Multiwire dielectric detector

The results on investigating the operation of a multiwire dielectric detector with pulsed power supply in the millisecond range of working and depolarizing voltage duration are given. Cathodes of the detector investigated are made of fine-structure grids with transparence of about 70%. The distance between three these electrodes equals 560+-20 μm. Gold coated tungsten anode wires 25 μm in-diemater are stretched between cathodes with 0.5 mm pitch. The detector working area is 2x4 cm. Porous CsI with the density of 1% and 2% relatively to monocrystal density is used as the working medium. All anode wires are connected with the common load of 50 Ohm. The detector is set up in evacuated volume and operates at the pressure of 10-3 Torr. A scintillation counter is installed under the detector to count particles passing through it. The efficiency of particle detection eta is determined as the ratio of the number of particles registered by the detector to the number of particles detected by the scintillation counter. Measurements were carried out with radioactive alpha source at the 5.5 MeV energy and β source at the energy of 1-2 MeV. The analysis of the data obtained shows that eta value falls with duration of working voltage pulses increase and in this case eta decrease quicker at the 2%-density than at 1%-one. The detector operates practically in a stable regime upto t=3 ms at the 2%-densit while at 1%-densit.y.the fall in registration effectiveness upto t=5 cm doesn't observe. The conclusion is made that the detector studied may be applied to detect both high- and low ionizing particles