Conveners
Gas Detectors - Poster session
- Maksym Titov (CEA)
- Beatrice Mandelli (CERN)
Coarsely segmented (pitch > 1 mm) zigzag-shaped anode strip arrays have been shown to have considerable advantages over similarly pitched straight strip arrays for standard planar MPGDs, including GEM, Micromegas, and micro-RWELL detectors. Once the geometric parameters of the zigzag are precisely tuned for a specific detector application, the spatial resolution remains high and approximately...
Extreme Energy Events (EEE) detectors are designed to measure secondary cosmic ray tracks, mainly muons, to study high energy primary cosmic rays. The EEE ‘telescope’ is made by 3 Multigap Resistive Plate Chamber (MRPC), each with an active area of 160x82 cm2 in size. Each detector is part of a large network of about sixty telescope s spread over the Italian territory. GPS time...
The tracker detector of MEG II and the one under development of CREMLIN+, FCC and CEPC experiments consists of ultralight drift chambers, operated with a mixture of Helium and Isobutane. A stable performance of the tracker detector in terms of its electron transport parameters, avalanche multiplication, composition and purity of the gas mixture is of crucial importance, so in order to have a...
The MEG experiment has set the latest limit of 4.2 x 10^(-13) (90% C.L.) on the branching ratio of the charged lepton flavour violating decay µ+ -> e+ γ, making use of the most intense continuous surface muon beam in the world at the Paul Scherrer Institut(PSI), Villigen, Switzerland. An intense upgrade of the experiment, MEGII, has been carried out, successfully concluded with the beginning...
Additive manufacturing is a popular technique currently providing new opportunities in several domains. In this proposed work, we applied the above-mentioned technology to detector construction. We had hypothesized that a fully automated 3D printing of a detector would be ideal to drastically reduce: 1) detector construction cost and assembly time 2) the probability of mistakes during...
In the MEG II detector, the measurement of the momentum of the charged particle is performed by a high transparency single volume, full stereo cylindrical Drift Chamber (CDCH). It is composed of 9 concentric layers, each consisting of 192 drift cells. The single drift cell is approximately square, with a $20~\mu m$ gold plated W sense wire surrounded $40~\mu m$/$50~\mu m$ silver plated Al...
The future Electron-Ion Collider (EIC) at Brookhaven National Laboratory (BNL) will collide polarized electrons with polarized proton/ions. This unique environment imposes stringent requirements on the tracking system needed for the measurement of the scattered electron and charged particles produced in the collisions. A Totally Hermetic Electron-Nucleus Apparatus (ATHENA) detector has been...
Resistive Plate Chamber (RPC) detectors are currently used in High Energy Physics (HEP) experiments for triggering and tracking purposes for their low-cost of fabrication, high efficiency (> 90%) and good time resolution (∼ 1-2 ns). RPC is also a potential candidate for high-resolution medical imaging.
Keeping in mind, the requirements of detectors having high-rate handling capability,...
Within the family of the Micro Strip Gas Detectors (MSGD), the intrinsic characteristics of the bulk Micro-Megas (MM) device represent the most promising features for the construction of a new instrument to be operated as a TPC gas chamber in a low-pressure regime. In this study, we present the main properties of a low-pressure bulk MM detector in which the amplification gap was slightly...
In December 2018 the Large Hadron Collider entered the Long Shutdown 2 phase, during which a maintenance program of the LHC took place.
The upgrades of the accelerators aim at increasing the instantaneous luminosity, to enlarge the statistics collected in the data taking runs, up to a factor 5-7 beyond the original LHC design in the HL-LHC program.
To cope with this, the experiments must...
The Large Hadron Collider (LHC) will be upgraded to increase its luminosity by a factor of 7.5 relative to the design luminosity (referred as HL-LHC). The ATLAS detector will undergo a major upgrade to fully explore the physics opportunities provided by the HL-LHC. In order to improve the Level-1 muon trigger efficiencies at the HL-LHC, the precision Monitored Drift Tube (MDT) chambers will be...
The search for weakly interacting, light particles that couple to photons received significant attention in recent years. When those particles are produced at high energies, they may decay in two collinear photons that can be detected by an electromagnetic calorimeter system. The typical dominant background in searches for those high energetic weakly particles are single, high energetic...
The extension of data acquisition for the Beijing Electron Spectrometer (BESIII) experiment until at least 2030 has resulted in upgrades to both the accelerator and the detector.
An innovative Cylindrical Gas Electron Multiplier (CGEM) is under construction to upgrade the inner tracker, which is suffering from aging. The CGEM Inner Tracker (CGEM -IT) was designed to restore efficiency and...
Will be present the ongoing work on the development and testing of a prototype of a Micromegas (MM) detector and its front end that are intended to be a candidate for the substitutions of some of the Multi Wire Proportional Chambers (MWPC) in the future AMBER (NA66) experiment at CERN.
Presently the MWPCs are used in the COMPASS (NA58) experiment at CERN as one of the main trackers and it is...
A new experimental system was recently developed by our group to measure the mobility of both positive and negative ions: the Dual-Polarity Ion Drift Chamber (DP-IDC). This new system is intended to foster the understanding of transport properties of ions in gases, as these are specially relevant for the performance of gaseous detectors, namely in large volume ones, in particular for the...
The characteristic studies of a Single Mask triple Gas Electron Multiplier (GEM) detector of dimension 10$\times$10 cm$^{2}$ is carried out using Ar/CO$_{2}$ gas mixture in 70/30 volume ratio in continuous flow mode. A strong Fe$^{55}$ X-ray source is used for this work. The gain and energy resolution are studied from the 5.9 keV X-ray energy spectra. Conventional NIM electronics is used for...
He-CF$_4$ is a very attractive gas mixture for Electroluminescence (EL)-based tracking detectors, with applications in Optical Readout Time Projection Chambers for Dark Matter Search. Whereas He maintains a low target mass (relevant for track reconstruction and low WIMP mass sensitivity), CF$_4$ is a fast and efficient scintillator in the UV and visible wavelengths, also providing sensitivity...
An R&D project has been recently started to consolidate the technology of resistive Micromegas for operations well beyond the actual operations at HEP experiments, aiming at stable, reliable, and high gain operation up to particle fluxes of the order of 10 MHz/cm2, over large surfaces.
To cope with these challenges, readout copper pads, of a few mm2 size, have been proposed to reduce the...
Timing Resistive Plate Chambers (tRPC) is a mature and widely used gaseous detector (ALICE@CERN, START@RHIC or HADES@GSI) for the precise timing tag of charged particles exhibiting an excellent timing precision, down to 50 ps, together with a high efficiency, larger than 98%, for minimum ionizing particles. Characteristics that can be implemented in large areas.
tRPC have traditionally...
Resistive strip Micromegas (MICRO-MEsh GAseous Structure) detectors provide even at square meter sizes a high spatial resolution for the reconstruction of Minimum Ionizing Particles (MIPs) like muons. Micromegas detectors consist of three parallel planar structures. One Cathode, a grounded mesh and a segmented anode structure form the detector. Square meter sizes challenge the high-voltage...
Theoretical prediction for the distribution of the angle between electrons and positrons originating in internal pair creations is a monotonic featureless decrease with the opening angle. Recent studies on excited states of 8Be and 4He nuclei, made in ATOMKI, Hungary, however, revealed deviations from this expectation. If true, such a result may have a fundamental...
A muon collider has a great potential for high energy physics. It combines the high precision of electron-positron machines, with a low level of beamstrahlung and synchrotron radiation, and the high centre-of-mass energy and luminosity of hadron colliders. The main challenges, that impact both the machine and detector design, arise from the short muon lifetime and the harsh Beam Induced...
In the large size ongoing experiments for particle physics and dark matter search (rare event experiments) new gas media are being used or sought. One of the key features required for these media is low electron transverse diffusion, to achieve good tracking accuracy that will enable the most needed background rejection. The properties of these new mixtures are mostly unknown and assessing...
Triple GEM technology has been selected to extend the acceptance of the CMS muon spectrometer to the region 2.4< |η| <2.8, the so called ME0 project. The ME0 stations will be formed by stacks (six-layer stations) of triple-GEM chambers, which must operate in a harsh environment with expected background particle fluxes ranging between 3 and 150 kHz/cm2 on the chamber surface. Both the maximum...
IDEA (Innovative Detector for an Electron-positron Accelerator) is an innovative general-purpose detector concept, designed to study electron-positron collisions in a wide energy range provided by a very large circular leptonic collider. The IDEA drift chamber is designed to provide an efficient tracking, a high precision momentum measurement and an excellent particle identification by...
With the increase of the LHC luminosity foreseen in the coming years, many detectors currently used in the different LHC experiments will be impacted dramatically and some need to be replaced. The new ones should be capable not only to support the high particle rate, but also to provide time information to reduce the data ambiguity due to the expected high pileup. The CMS collaboration have...
In view of the LHC Phase-2, the CMS experiment is being upgraded with three stations of triple-GEM detectors (GE1/1, GE2/1 and ME0) to maintain the excellent trigger pT resolution of its muon spectrometer in the high-luminosity LHC environment and extending its coverage to the very-forward pseudorapidity region 2.4<|η|<2.8. The challenges faced for adapting the triple-GEM technology to a...
Large Resistive Plate Chamber (RPC) systems have their roots in High Energy Physics (HEP) experiments at European Organization for Nuclear Research (CERN): ATLAS, CMS, ALICE, where hundred of square meters of both trigger and timing detectors, have been deployed. These devices operate with complex gas systems, equipped with re-circulation and purification units, which require the addition of...
The small (15 mm)-diameter Muon Drift Tube (sMDT) detector technology has been chosen and constructed in order to cope with the increased background counting rates expected at the High Luminosity-Large Hadron Collider (HL-LHC) and Future Circular Collider (FCC-hh). Unfortunately, the rate capability of the sMDT drift tubes in terms of muon detection efficiency and spatial resolution is strongly...
The Extreme Energy Events (EEE) Project is based on the deployment of cosmic-ray telescopes in Italian high schools with the active contribution of students and teachers in the construction and operation of the detectors.
The telescope network counts ~60 tracking detectors, each one made by three Multigap Resistive Plate Chambers (MRPC) with an active surface of 158x82 cm$^2$. The induced...
Position resolution and gain uniformity of gaseous ionization detectors play essential roles in tracking charged particles and subsequent imaging. In the present work, experimental studies has been conducted to investigate the position resolution, charge spread and gain uniformity of Gas Electron Multipliers based detector. These results are essential for understanding the performance of the...
RPC detectors are largely employed in LHC experiments thanks to their excellent trigger efficiency, time performance, and contained production costs. They are operated with 90-95% of R-134a, 5%-10% of isobutane and 0.3% of SF6. R-134a and SF6 are nowadays known to be greenhouse gases, with a GWP of 1430 and 22800 respectively, therefore subjected to European regulations aiming at reducing...
We have studied the ageing behaviour of 6~mm diameter straw tubes and found the ageing rates with the binary gas mixture - Ar/CO$_2$ to justify its use in future high energy physics experiments. Two separate experiments are performed with the straw tube detector prototypes in the laboratory. In the first experiment, the performance of the straw tube detector is studied using a single straw...
Gas Electron Multipliers (GEM) are widely used for various high energy particle physics
experiments world-wide. Thorough understanding of the working of GEM detectors are, thus,
a matter of priority. Space charge accumulation within GEM holes is one of the vital
phenomena which affects many of the key working parameters of such detectors through its
direct influence on the resulting...
The CMD-3 is a general-purpose detector at VEPP-2000 collider whose purpose is to study the exclusive modes of $e^{+}e^{-}\longrightarrow hadrons$ in the center of mass energy range below 2 GeV. The CMD-3 results will provide an important input for the calculation of the hadronic contribution to the muon anomalous magnetic moment. An upgrade of the CMD-3 tracker is currently in progress. The...
The Large Hadron Collider (LHC) will undergo a major upgrade in the mid - 2020s referred as High Luminosity LHC (HL-LHC) to extend its operability by another decade and in addition to increase its luminosity with the aim to increase the potential for new discoveries. In order to meet the experimental challenges of unprecedented proton-proton luminosity causing expected increase of both...
The Surface Resistive Plate Counter (sRPC) is a novel RPC based on surface resistivity electrodes, a completely different concept with respect to traditional RPCs that use electrodes characterized by volume resistivity (phenolic-resin or float-glass).
The electrodes of the sRPC exploits the well-established industrial Diamond-Like-Carbon (DLC) sputtering technology on thin (50 µm) polyimide...
The IDEA detector concept has been designed to operate at a future large circular e+e- collider, like FCC-ee or CEPC. The IDEA detector has an innovative design with a central tracker enclosed in a superconducting solenoidal magnet. Going outwards, a preshower system followed by a dual readout calorimeter is foreseen. In the iron yoke, that closes the magnetic field, are then located three...
A large, worldwide community of physicists is working to realise an exceptional physics program of energy-frontier, electron-positron collisions with the International Linear Collider (ILC). The International Large Detector (ILD) is one of the proposed detector concepts at the ILC. The ILD tracking system consists of a Si vertex detector, forward tracking disks and a large volume Time...
Visual investigation of a Single Mask (SM) Gas Electron Multiplier (GEM) foil is performed manually using an optical microscope having magnification factors of 20x and 40x. The scanned SM GEM foil is being used as the 3rd GEM foil of a triple GEM chamber prototype used for long-term studies. During the long-term test, it is observed that the detector suddenly stopped giving the signal. To...
