The PANDA Endcap Disc DIRC (#1747)
1 Justus-Liebig Universität Giessen, II.Physikalisches Institut, Giessen, Hesse, Germany
PANDA Cherenkov Group
The physics program of the PANDA experiment at the future Facility for Antiproton and Ion Research (FAIR) requires excellent particle identifications. For this purpose two DIRC (Detection of Internally Reflected Cherenkov light) detectors will cover the angular range of 5 − 140° and provide a clean separation of pions and kaons for momenta up to 4 GeV/c. These detectors enable a very compact design as the radiator, where the Cherenkov light is emitted, also serves as a light guide.
The forward region between 5 − 22° will be equipped with the Endcap Disc DIRC. It consist of four identical subdetectors and uses special focusing optics and MCP-PMTs with a fine segmentation to provide the anticipated resolution. The talk will explain the criteria which lead to the current design and give an overview of the individual components as well as recent prototype tests to validate the detector performance.
Keywords: Cherenkov Detector, MCP-PMT, Particle Identification, Optics
Upgrades of the CMS muon system in preparation of HL-LHC (#2048)
1 RWTH Aachen University, III. Physikalisches Institut A, Aachen, Germany
on behalf of the CMS Collaboration
The present CMS muon system operates three different detector types: in the barrel drift tubes (DT) and resistive plate chambers (RPC), along with cathode strip chambers (CSC) and another set of RPCs in the forward regions. In order to cope with increasingly challenging conditions various upgrades are planned to the trigger and muon systems. New detectors will be added to improve the performance in the critical forward region: large-area triple-foil gas electron multiplier (GEM) detectors will already be installed in LS2 in the pseudo-rapidity region 1.6 < eta < 2.4, aiming at suppressing the rate of background triggers while maintaining high trigger efficiency for low transverse momentum muons. For the HL-LHC operation the muon forward region should be enhanced with another large area GEM based station, called GE2/1, and with two new generation RPC stations, called RE3/1 and RE4/1, having low resistivity electrodes. These detectors will combine tracking and triggering capabilities and can stand particle rates up to few kHz/cm2. In addition to take advantage of the pixel tracking coverage extension a new detector, ME0 station, behind the new forward calorimeter, covering up to |η| = 2.8.
Keywords: Muon, CMS, upgrade, GEM, RPC
The LUCID-2 detector (#2086)
A. Sbrizzi1, R. Soluk2
1 INFN, Physics, Bologna, Italy
The LUCID-2 detector is the main online and offline luminosity provider of the ATLAS experiment. It provides over 100 different luminosity measurements from different algorithms for each of the 2808 LHC bunches. LUCID was entirely redesigned in preparation for LHC Run 2: both the detector and the electronics were upgraded in order to cope with the challenging conditions expected at the LHC center of mass energy of 13 TeV with only 25 ns bunch-spacing. While LUCID-1 used gas as a Cherenkov medium, the LUCID-2 detector is in a new unique way using the quartz windows of small photomultipliers as the Cherenkov medium. The main challenge for a luminometer is to keep the efficiency constant during years of data-taking. LUCID-2 is using an innovative calibration system based on radioactive 207 Bi sources deposited on the quartz window of the readout photomultipliers. This makes it possible to accurately monitor and control the gain of the photomultipliers so that the detector efficiency can be kept stable at a percent level. A description of the detector and its readout electronics will be given, as well as preliminary results on the ATLAS luminosity measurement and related systematic uncertainties.
Keywords: Luminoisty, Phtomultipliers, Cherenkov light
Commissioning of Liquid Xenon Photon Detector for MEG II Experiment (#2534)
1 The University of Tokyo, International Center for Elementary Particle Physics (ICEPP), Tokyo, Japan
An upgrade programme of the MEG experiment (MEG II) in search for the lepton flavour violating decay, $\mu^+ \to e^+ \gamma$ is underway aiming at ten times higher branching-ratio sensitivity of 4x10-14
The 52.8 MeV-photon from $\mu^+ \to e^+ \gamma$ will be measured by a large liquid xenon (LXe) scintillation detector, based on 900L LXe with a high-granularity scintillation readout by 4092 large-area VUV-sensitive MPPCs with an active area of 139 mm2 each, totalling 0.57 m2on the photon impinging side. Excellent resolutions (~1% for energy, 40--60 ps for timing and ~2 mm for position) are found to be achievable with the high-granularity scintillation readout by the VUV-MPPCs.
The detector construction, including a complicated installation of the 4092 VUV-MPPCs after a complete test of the individual sensors, has been successfully completed. The detector is now in the commissioning and calibration phase. The detector alignment and the performance test using various calibration sources are underway. The detailed performance of the detector measured in the commissioning will be reported.
Keywords: liquid xenon, SiPM, MPPC, VUV, calorimeter, scintillation detector
The KLOE-2 experiment at the DAFNE collider (#2960)
1 Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, Frascati, Italy
The KLOE-2 experiment at the INFN Laboratori Nazionali di Frascati is currently taking data at the e+e- DAFNE phi-factory. It is the continuation of the KLOE experiment, upgraded with state-of-the-art detectors to improve its performances and extend its physics reach. KLOE-2 has already collected an integrated luminosity of 3.5 fb-1, aiming to reach a total amount of more than 5 fb-1 by the Spring of 2018.
The general purpose KLOE detector, composed by one of the biggest Drift Chamber ever built surrounded by a lead-scintillating fiber Electromagnetic Calorimeter among the best ones for energy and timing performance at low energies, received several upgrades with the purpose of improving the performance and extending the physics reach. Two new calorimeters, one with LYSO crystals and the other with a Tungsten and scintillating tiles structure, extend the acceptance for neutral particles. Two couples of taggers close to the beams allow to tag events where photons are irradiated inside the detector, used for the study of gamma-gamma physics. Finally, to improve the vertex reconstruction capabilities near the interaction region, a state-of-the-art cylindrical GEM detector has been installed as Inner Tracker. KLOE-2 is thus the first high-energy experiment using the GEM technology with a cylindrical geometry, a novel idea that was developed at Frascati to build light and compact tracking system.
Detailed description of the KLOE-2 instrumentation will be given including the performance with e+e- collisions.
Keywords: e+-e- experiment, Flavor physics, High energy physics instrumentation, Calorimeter, Tracking detector
The ProtoDUNE Single-Phase Detector (#3268)
1 Brookhaven National Laboratory, Upton, United States of America
On Behalf of the DUNE Collaboration
The DUNE experiment is designed to measure CP violation in the lepton sector by measuring neutrino oscillations over a very long baseline. The experiment will consist of a megawatt class neutrino beam and near detector at FNAL and four far-site liquid argon time projection chambers (LAr TPCs) each with a total (fiducial) mass of 17kt (10kt) and a baseline of 1,300 m. The first of the large detectors will be operational in the SURF underground facility in 2024. Each far detector will be more than 20 times the scale of the ICARUS detector, which is the largest detector operated to date. Given the size and cost of the far site detectors it is critical to prototype the detector components to be certain the design is sound and the performance will meet the physics needs. The Neutrino Platform at CERN is constructing a new test beam facility for the DUNE collaboration to test the prototype detectors. CERN is also constructing two cryostat and cryogenic systems for use by DUNE to test the final detector designs. DUNE is constructing two prototype TPCs based on a single-phase readout design and a dual-phase readout design. This presentation will cover the design of the single-phase TPC and the goals of the ProtoDUNE-SP experiment. The size of the far detector and the limitations of the shafts for underground access require a modular detector design. The ProtoDUNE-SP prototype is configured so that full-scale detector components can be tested. Unique features of this design are the cold electronic readout needed for the charge readout, modular design of all components, a resistive cathode plane and segmented field cage. The design of the photon detection system will also be presented.