Two-dimensional transmission counter with a backgammon-drift read-out technique

A new type of two-dimensional position sensitive gas counter for transmission counter with a backgammon-shaped flat electrode has been developed. The two dimensional position read-out can be achieved with the combination of a backgammon-shaped flat electrode read-out as horizontal position and the drift time measurement read-out as vertical position. The gas counter is designed as a transmission trajectory counter that can be used to determine angle of incident charged particles in charged particle detecting system. To check the characteristics of this gas counter, test experiments are performed with a coincidence plastic scintillation counter and β-ray source of ⁹⁰Sr.