Abstract

A novel Resistive Plate Chamber (RPC) was designed with Diamond-Like Carbon (DLC) electrodes and performance studies were carried out for 384μm gap configuration with a 2cm×2cm prototype. The use of thin films coated with DLC enables an ultra-low mass design of less than 0.1%X0 with up to a four-layer configuration. At the same time, 42% MIP efficiency, and 180ps timing resolution per layer were achieved in a measurement performed under a 1 MHz/cm2 non-MIP charged particle beam. In addition, we propose a further improved design for a 20cm-scale detector that can achieve 90% four-layer efficiency in an even higher 4 MHz/cm2 beam. In this paper, we describe the detector design, present the results of performance measurements, and characterize the rate capability of the DLC-based RPCs with a performance projection for an improved design.

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