Multi-strip Resistive Plate Chambers Research Articles

Development of a time resolution and position sensitive Multi-Gap Multi-Strip RPC for high counting rate experiments

A full differential strip readout multi-gap RPC was developed to meet high counting rate and high multiplicity requirements of a high collision rate experiments as Compressed Baryonic Matter at the future FAIR facility. The Multi-Gap, Multi-Strip Resistive Plate Chamber (MGMSRPC) is a completely symmetric two stack structure with time resolution around 50 ps and a detection efficiency better than 95%. A very good efficiency and time resolution at counting rates exceeding the CBM-TOF requirements is obtained using low resistivity (~ 1010 Ωcm) glass electrodes.

Frequency-domain formulation of signal propagation in multistrip Resistive Plate Chambers and its low-loss, weak-coupling analytical approximation

In this study the signal propagation in multistrip Resistive Plate Chambers is formulated exactly in the framework of the multiconductor transmission line theory in the frequency domain, allowing losses to be incorporated. For the case of weak-coupling and low-losses a first-order expansion yields simple, fully analytical, expressions that include reflections. In this approximation the modal spectrum can be calculated analytically as well, allowing to estimate easily the strength of the modal dispersion phenomenon.

Signal coupling and signal integrity in multi-strip resistive plate chambers used for timing applications

We have systematically studied the transmission of electrical signals along several 2-strip Resistive Plate Chambers (RPCs) in the frequency range f=0.1−3.5GHz. Such a range was chosen to fully cover the bandwidth associated to the very short rise-times of signals originated in RPCs used for sub-100ps timing applications. This work conveys experimental evidence of the dominant role of modal dispersion in counters built at the 1m scale, a fact that results in large cross-talk levels and strong signal shaping. It is shown that modal dispersion appears in RPCs due to their inherent unbalance between capacitive and inductive coupling. A practical way to restore this symmetry has been introduced (hereafter 'electrostatic compensation’), allowing for a cross-talk suppression factor up to ×12 and a rise-time reduction by 200ps. Under conditions of compensation the signal transmission is only limited by dielectric losses, yielding a length-dependent cutoff frequency of around 1GHz for propagation along 2m in typical float glass-based RPCs.It is further shown that 'electrostatic compensation’ can be achieved for an arbitrary number of strips as long as the nature of the coupling is 'short-range’, that is an almost exact assumption for typical strip-line RPCs. This work extends the bandwidth of previous studies by a factor of×20.

Study of readout and cross-talks for multi-strip RPC with PSpice simulation**Supported by Ministry of Education of China (306022), and National Natural Science Foundation of China (10635020)

An electrical model for multi-strip resistive plate chamber (RPC) is presented, and a comparison between simulation results and test data is carried on. Based on the model, the influences of the RPC's design parameters on the readout are studied with PSpice simulation. Cross-talk (CT) phenomenon is observed and the relative amplitudes of the CT are studied for different design parameters.

Study of cross-talks for multi-strip RPC read-out

A study of the cross-talks for multi-strip resistive plate chambers (RPC) read-out was carried out using the beam and Inner Spark Pulser data. The influence of the surface resistivity of the high voltage (HV) electrode graphite coating on the induced charge spread among the read-out strips was observed. The waveforms and relative amplitudes of the cross-talks (CT) signals were studied for different discharge positions across the strips. No cross-talk and cluster size reduction was obtained for the strip panel with tiny screening strips as compared to the ordinary panel.