Investigating different geometrical parameters affecting the electric field of cylindrical microdosimeter

Abstract

In order to make a microdosimeter, it is first necessary to investigate the parameters affecting the electric field of the microdosimeter, such as the presence of the helix, the thickness and voltage of the helix, the radius and the number of its rings, as well as the thickness and voltage of the anode, and obtain its optimal conditions. In order to obtain the optimal conditions of the electric field, things such as the possibility of manufacturing, no electric discharge, increasing the intensity of the electric field at a constant voltage, energy resolution, continuity of the electric field with the presence of a helix, and a significant increase in multiplication in a small volume of the microdosimeter around the anode have been considered. Since the presence of the helix complicates the analytical solution of the problem, therefore, using the COMSOL simulation code, we investigated the various parameters of the electric field. Finally, for the cylindrical anode with a height of 25 mm, in optimal conditions; the thickness of the anode was obtained 0.4 mm, a helix with a thickness of 0.6 mm and a radius of 1.5 mm was obtained, which has 9 rings coaxially with the anode. Therefore, the obtained values can be used to make microdosimetry with the geometric dimensions of 25 mm right cylinders, which can investigate microdosimetry sites with different dimensions by changing the pressure of the gas density inside it.