Development of gaseous particle detectors based on semi-conductive plate electrodes.

Rocchi A., Caltabiano A., Camarri P., Cardarelli R., Bruno S., Di Ciaccio A., Liberti B., Pizzimento L.
  Venerdì 15/09   09:00 - 12:00   Aula A208   I - Fisica nucleare e subnucleare
A new kind of particle detector based on Resistive Plate Chamber structure is under development. Semi-conductive electrodes with resistivity up to $10^{8} \Omega $cm are introduced to improve rate capability performance. The aim is to obtain a radiation hard detector with sub-nanosecond time resolution capable of working in high-rate environment (order of MHz/cm${}^2$). In this presentation some results on two configurations under test are described: the first characterized by 1 mm gas gap and both SI(Semi-Insulating)-gallium arsenide electrodes ($\sim 10^{8} \Omega$cm), and the other characterized by 1.5 mm gas gap, one SI-GaAs electrode and one intrinsic silicon ($\sim 10^{4} \Omega $cm) electrode. The DC Voltamperometric characterization of a SI-GaAs sample measured applying metal electrodes on the substrate is also reported.