F. Udo

Studies of an MSGC equipped with a GEM grid as a tracking device

Abstract The performance of a Micro Strip Gas Counter (MSGC) equipped with a Gas Electron Multiplier (GEM) has been studied in a cosmic hodoscope. Using Ne/DME gas mixtures, measurements have been performed to study gain, transparency and spatial resolution.

Operation of micro strip gas counters with Ne-DME gas mixtures

The performance of micro-strip gas counters (MSGCs) has been studied with gas mixtures of neon and dimethylether. The setup consisted of two 10 × 10 cm2 MSGC detectors placed in a cosmic ray hodoscope made of twelve drift chambers. Measurements are presented for the collected charge and the detection efficiency. A Monte Carlo simulation has been used to verify our understanding of the efficiency measurements. The simulation has also allowed to estimate the transverse diffusion coefficient of the electrons in the gas and to predict the spatial resolution of the detectors.

The MICROMEGEM detector

Abstract This article introduces the MICROMEGEM detector, a position-sensitive proportional gas counter produced using advanced Printed Circuit Board (PCB) technology. The detector is equipped with a Gas Electron Multiplier (GEM) foil placed 50 μm above a plane of pick-up strips. The GEM produces a first gas amplification which is extended below the GEM foil by applying a strong electric field between the strips and the lower electrode of the GEM. The array of strips is used for read-out to obtain 1-D positional information. We present results on the gas gain, the energy resolution and the rate capability. The behaviour in an intense beam of 300 MeV /c pions in presence of heavily ionizing particles has also been investigated.

Study of inclined particle tracks in micro strip gas counters

The response of micro strip gas counters (MSGC) has been studied for particle tracks with inclined incidence with respect to the strip plane. The setup consisted of four 10 × 10 cm2 MSGC detectors arranged in a cosmic ray hodoscope with a trigger threshold of 300 MeV/c for muons. Results are given for the collected charge, the spatial resolution and the detection efficiencies. A Monte Carlo simulation has been used to understand the effects of cross talk in the data and to extrapolate the data to other angles of incidence.

OPERATION OF MICROSTRIP GAS COUNTERS WITH DME-BASED GAS MIXTURES

Abstract This paper reports on the operation of MicroStrip Gas Counters (MSGC) with several dimethylether (DME)-based gas mixtures. We present measurements of signal amplitude, detection efficiency and spatial resolution for minimum ionizing particles. We also show measurements of electron drift velocity and transverse diffusion coefficient in the counting gases considered. These results are discussed regarding the use of MSGC’s for tracking at high-energy physics experiments that have to deal with high particle rates.

Simulation study of silicon and gaseous tracking detectors

The performance of microstrip gaseous counters (MSGC, MSGC + GEM) and silicon microstrip sensors has been studied in view of their use in high luminosity tracking applications. Simulations of signal development in the detectors and subsequent signal treatment in the readout electronics were performed. The simulation results are compared with experimental data obtained in test beams.

Results from the MSGC tracker at SMC

A tracker consisting of 16 MSGCs has been installed in the high intensity muon beam of the SMC experiment[1] at CERN. Each MSGC has an active surface of 10 × 10 cm2, covered by 496 anode strips. As a front-end amplifier the APC 64 is used. Results are presented about the efficiency, both at a high rate and at a low rate, and the position resolution. Using the data of the MSGC tracker the definition of the beam tracks in SMC significantly improved.

Operation of a micro strip gas counter equipped with a gas electron multiplier

Abstract This paper reports on the operation of a Micro Strip Gas Counter (MSGC) equipped with a Gas Electron Multiplier (GEM) filled with Ar/CO2, Ne/CO2 and Ne/DME/CO2. We present measurements of the detection efficiency for minimum ionizing particles, and of the electron drift velocity and transverse diffusion coefficient in the counting gases considered.

Experimental and simulation study of the MSGC + GEM detectors

We report the results of systematic investigations on operating properties of MSGC+GEM detectors exposed to different sources of X-rays. The influence of the drift field on the detector response has been studied experimentally and by simulation. Charging-up effects depending on the drift field will be discussed.