Signal propagation in straw tubes with resistive cathode

Transparency of the straw tube cathode for the electromagnetic field

“…Plots presented in Fig. 5 show that the assumptions made in [2] that in the high frequency range current flows along the straw seems to be appropriate only for the straws with high resistance cathodes (1 and 2). Straws with lower cathode resistance show their inductive properties.…”

“…The solution of the set of differential equations, which describe the model [2] gives certain dependencies, describing the transmission line with the resistive cathode. The model shows very good agreement with the experimental data, also in case of straws with exceptionally high cathode resistance.…”

“…An assumption, made in the design of the straw model [2], that the cathode impedance has a resistive character, is a serious simplification. However, such simplification was necessary in order to avoid further complication of a model, which is very complex anyhow.…”

“…For dc, the cathode impedance per straw unit length is equal to the parallel connection of resistances of both straw layers and can be calculated (in m ) as (2) where m is a resistance per straw unit length of the conductive layer for the current flow parallel to the straw axis.…”

“…Therefore, a certain mathematical model was proposed [2] in which the cathode resistivity is taken into account. Since the resistive cathode potential is 0018-9499/02$17.00 © 2002 IEEE R is a serial resistance of the cathode, C is the capacitance between straw cathode and ground.…”