Generator level study of a Z′ boson decaying into non-SUSY dark matter

A Randal-Sundrum inspired model predicts a dark matter candidate together with an additional Z′ boson. The detection of this boson and the measurement of its mass and production cross section at a future linear collider is investigated at the generator level. The expected accuracy of the cross section production and of the mass of the Z′ boson measurements are reported

Large surface micromegas with embedded front-end electronics for a digital hadronic calorimeter

International audienceIn order to study the advantages of a digital hadronic calorimeter for particle flow algorithms, we aim to build a detector prototype with MicroMegas chambers. The bulk technology was chosen for its robustness and the possibility of industrial manufacturing process for mass production. First tests of 1 cm2 granularity MicroMegas with analog readout are very promising. Larger chambers with embedded digital front-end electronics together with detector interface readout boards are being designed. The challenge also lies in the mechanical design of a 1 m2 chamber with a total thickness of 6 mm

MICROMEGAS Beam Test 2008 - Analysis & Results

Prototypes of MICROMEGAS chambers using bulk technology and equipped with analog readout have been tested in particle beams. Measurements of detector gain, efficiency and multiplicity are presented. Disparities of gain and efficiency are presented as well. Threshold dependencies of efficiency and multiplicity are also shown. The chambers behaviour in high energy hadronic showers is briefly addressed in the last section

Environmental study of a Micromegas detector

We report on measurements of the basic performance of a Micromegas detector for a digital hadronic calorimeter. Electron collection efficiency, energy resolution and gas gain were measured in various mixtures of Ar and CO2. Also the dependence of the gain on environmental variables (pressure, temperature), gas parameters (flow, mixing ratio) and geometry (amplication gap size) is studied. Eventually, predictions on the impact of these variables on the detection efficiency of thin Micromegas detectors are drawn

Large Area Micromegas Chambers with Embedded Front-end Electronics for Hadron Calorimetry

AbstractMicromegas (Micro-mesh gaseous structure) is an attractive technology for applications in particle physics experiments (TPC, calorimeters, muon systems, etc.). The most important results of an extensive R&D program aiming to develop a new generation of a fine-grained hadron calorimeter with low power consumption digital readout using Micromegas chambers as an active element are presented. In 2010, the first large scale prototype of Micromegas chamber with almost 8000 readout channels has been built and tested with high energy particle beams at CERN. The fundamental results, such as detection effciency, hit multiplicity, gain stability, response uniformity and effect of power pulsing of the detector front-end electronics are reported. Eventually, the development and test of the second generation of the large scale prototype with new readout electronics and some important improvements of its mechanical design is described and the prospective towards the construction of a technological prototype of a 4.5 λ deep digital calorimeter for a future linear collider is also given

MICROMEGAS chambers for hadronic calorimetry at a future linear collider

Prototypes of MICROMEGAS chambers, using bulk technology and analog readout, with 1x1cm2 readout segmentation have been built and tested. Measurements in Ar/iC4H10 (95/5) and Ar/CO2 (80/20) are reported. The dependency of the prototypes gas gain versus pressure, gas temperature and amplification gap thickness variations has been measured with an 55Fe source and a method for temperature and pressure correction of data is presented. A stack of four chambers has been tested in 200GeV/c and 7GeV/c muon and pion beams respectively. Measurements of response uniformity, detection efficiency and hit multiplicity are reported. A bulk MICROMEGAS prototype with embedded digital readout electronics has been assembled and tested. The chamber layout and first results are presented

Recent results of Micromegas sDHCAL with a new readout chip

Calorimetry at future linear colliders could be based on a particle flow approach where granularity is the key to high jet energy resolution. Among different technologies, Micromegas chambers with 1 cm2 pad segmentation are studied for the active medium of a hadronic calorimeter. A chamber of 1 m2 with 9216 channels read out by a low noise front-end ASIC called MICROROC has recently been constructed and tested. Chamber design, ASIC circuitry and preliminary test beam results are reported

Construction and test of a 1×1 m2 Micromegas chamber for sampling hadron calorimetry at future lepton colliders

Equipe MicromegasSampling calorimeters can be finely segmented and used to detect showers with high spatial resolution. This imaging power can be exploited at future linear collider experiments where the measurement of jet energy by a Particle flow method requires optimal use of tracking and calorimeter information. Gaseous detectors can achieve high granularity and a hadron sampling calorimeter using Micromegas chambers as active elements is considered in this paper. Compared to traditional detectors using wires or resistive plates, Micromegas is free of space charge effects and could therefore show superior calorimetric performance. To test this concept, a prototype of 1×1 m2 equipped with 9216 readout pads of 1×1 cm2 has been built. Its technical and basic operational characteristics are reported