Resolution of a position-sensitive proportional-counter with a resistive anode wire of carbon fiber

Theoretical and experimental analyses have been performed to examine the position resolution of a proportional counter with a 7-μm diameter carbon fiber as a resistive anode, which is used to encode one-dimensional positions of incident photons according to the charge-division method. These analyses have clearly shown that the carbon fiber is applicable to the position sensing of the order of 100–200 μm as long as the filled gas is pressurized at near 10 atm.