A report will be presented on the performance of Time Projection Chamber gas amplification elements that have been utilized and gases proposed for next generation central tracking detectors, including an option with continuous readout at high luminosity. The presentation will focus on issues critical for high rate detector operation, such as the positive ion backflow (IBF) and energy...
Time projection chambers read by gaseous detectors are widely used but the gaseous amplification has several drawbacks: constraints on the gas mixture, energy resolution degradation, ion backflow in the drift volume. The present project proposes to detect directly the primary ionization electrons, with several applications: hydrogen TPC as proton active target, search for neutrinoless...
In the framework of the HL-LHC project, the upgrade of the CMS Muon System foresees the installation of three new muon stations based on the GEM technology, named as GE1/1, GE2/1 and ME0 detectors. The CMS GEM Group has developed a novel construction design of GE1/1 triple-GEM detectors; in particular, a new self-stretching technique has been introduced to mechanically stretch the GEM foils...
Charging-up is a common phenomenon observed while working with gaseous ionization detector having dielectric material. It is mainly comprised of two processes namely, the polarization of dielectric due to exposure of high electric field and collection of charges on the dielectric surface. Both of these charging-up processes affect the gain of the detector as they change the local field...
Gas amplification of the electrons created by X-rays or charged particles plays an essential role in their detection with gaseous detectors. However, its gain fluctuates because of avalanche statistics, thereby degrading the energy resolution for monochromatic X-rays or the spatial resolution at long drift distances for large Time Projection Chambers (TPCs). We have developed a novel technique...
Thick GEM (THGEM) is one of the promising micro-pattern gaseous detectors (MPGDs), its attractive advantages are high gain, robust and low cost. THGEM is suitable for Digital Hadron Calorimeter(DHCAL), TPC tracker readout, muon、neutron and single photon detection, and so on. In recent years, we developed some new types of THGEMs, such as new FR4 THGEM, ceramic THGEM, Multi-layer THGEM...
We report on results which demonstrate that it is possible to achieve significant improvements in the spatial resolution of the planar 1D and 2D MPGDs with a relatively coarse pitch by using optimized zigzag-shaped readout electrodes instead of the conventional straight strips and square pads. The emerging readout plane configurations exhibit virtually no differential non-linearity (DNL) in...
NEWS-G (New Experiments With Spheres-Gas) is an experiment searching for dark matter using the Spherical Proportional Counter (SPC) technique. SPCs are low capacitance detectors which allow the detection of gas ionisation with very low (single electron) thresholds. It consists in a grounded metal sphere with a small sensing anode at the center, creating a radial electric field.
Using a UV...
Resistive Plate Chamber (RPC) detectors are widely used at the CERN LHC experiments. They are operated with a gas mixture containing C2H2F4 and SF6, both greenhouse gases (GHG) with a high global warming potential (GWP). The search of new environmentally friendly gas mixtures is necessary to reduce GHG emissions and costs as well as to optimize RPC performance.
Several new gases with low GWP...
A new readout scheme allowing the exploitation of Resistive Plate Chamber (RPC) spatial precision while using a limited number of electronic channels was designed. The new scheme that exploits the spread of the RPC induced charge on several adjacent inter-connected pads, allows the simultaneous detection of several particles without ambiguity. In this scheme, pads are connected in rows...
