  Resistive electrodes are used in gaseous detectors to quench electrical
discharges. This helps to protect delicate electrodes and readout electronics
and to improve the stability of the detector operation. An RPWELL is a
THGEM-based WELL detector with a resistive plate coupled to a conductive anode.
Till now, the choice of the resistive plate was limited to a few materials,
like LRS Glass and Semitron. These materials have fixed resistivities and,
sometimes, thickness and area limitations. This restricts the potential usage
of the detector to a rather small range of applications, as well as the
possibility of studying in depth the physics processes governing the discharge
quenching mechanism. In our present study, we used a new plastic material doped
with carbon nanotubes to produce resistive plates with a commercial 3D printer.
This method has the flexibility to produce samples of different thicknesses and
different resistivity values. We describe here the sample production and
characterize the RPWELL performance with different resistive plates. In
particular we show the dependence of discharge quenching on the thickness and
resistivity of the plate. The dynamics of the charge carriers in the material
is proposed as an explanation for the long gain recovery time after a
discharge.
