PANDA Detectors

The PANDA experiment at the international accelerator Facilityfor Antiproton and Ion Research in Europe (FAIR) near GSI,Darmstadt, Germany will address fundamental questions ofhadron physics. It will use antiproton beams on a fixed targetin the momentum range of 1.5-15 GeV/c. [...]

The fixed target experiment PANDA at the High Energy Storage Ring (HESR) of the Facility for Antiproton and Ion Research in Europe (FAIR) in Darmstadt will open unique possibilities to solve fundamental questions of hadron physics by using a cooled high-intensity antiproton beam.Two fast and compact Ring Imaging Cherenkov detectors using the DIRC (Detection of Internally Reflected Cherenkov light) technology will provide excellent charged particle identification (PID) in the PANDA target spectrometer.The Barrel DIRC will cover the polar angle range from 22° to 144° and cleanly separate pions from kaons for momenta up to 3.5 GeV/c.It consists of 16 optically isolated sectors, each comprising three bars, flat mirrors and focusing lenses, a compact fused silica prism as expansion volume, and 11 Microchannel-Plate PMTs (MCP-PMTs) as photon sensors.The bars are made from synthetic fused silica, have a length of 2400 mm and a cross section of 17 mm x 53 mm, and are built to tight optical and mechanical specifications to preserve the photon angle during many internal reflections and to optimize the light transport efficiency.The spherical lens system is designed to efficiently focus the Cherenkov light on a flat image plane on the back wall of the prism where the photons are detected by the array of MCP-PMTs.Detailed Geant4 simulations were performed to optimize the design for performance and cost and two complementary reconstruction algorithms were developed, one primarily based on photon spatial coordinates, the other emphasizing the precise measurement of the photon propagation time.All the key elements of the PANDA Barrel DIRC design were implemented in several complex prototypes and tested in hadronic particle beams at GSI and CERN.The data obtained were used to tune the simulation, validate the reconstruction methods, and to evaluate the PID performance of the design.We will discuss the technical design of the PANDA Barrel DIRC and present results from the test beam campaigns at the CERN PS in 2017 and 2018..

The PANDA experiment at the international accelerator Facility for Antiproton andIon Research in Europe (FAIR) near GSI, Darmstadt, Germany will address fundamentalquestions of hadron physics. Excellent Particle Identification (PID) over a largerange of solid angles and particle momenta will be essential to meet the objectivesof the rich physics program. [...]

The PANDA experiment at the international accelerator Facility for Antiproton and Ion Research in Europe (FAIR), under construction near GSI, Darmstadt, Germany, will address fundamental questions of hadron physics. Excellent Particle Identification (PID) over a large range of solid angles and particle momenta will be essential to meet the objectives of the rich physics program. [...]

The upgrade of the GlueX experiment at Jefferson Lab with a DIRC (Detection of Internally Reflected Cherenkov light) counter will significantly improve the particle identification (PID) capabilities in the forward region of the detector by providing clean π/K separation for momenta up to 4 GeV/c.The GlueX DIRC combines four bar boxes from the decommissioned BaBar DIRC detector with new compact photon cameras based on the SuperB FDIRC concept.Geant4 simulations were used to design the focusing photon camera. Two reconstruction algorithms were developed to optimize the hadronic PID performance. [...]

The PANDA experiment at FAIR (Facility for Antiproton and Ion Research in Europe) at GSI, Darmstadt, will study fundamental questions of hadron physics and QCD. A compact, fast focusing Ring Imaging Cherenkov counter using the DIRC (Detection of Internally Reflected Cherenkov light) technology, will provide charged particle identification (PID) in the barrel region of the PANDA experiment. [...]

Excellent hadronic particle identification (PID) in the barrel region of the PANDA experiment at the new Facility for Antiproton and Ion Research in Europe (FAIR) at GSI, Darmstadt, will be provided by a DIRC (Detection of Internally Reflected Cherenkov light) counter. It will cover the polar angle range of 22-140 degrees and separate charged pions from kaons for momenta between 0.5 GeV/c and 3.5 GeV/c with a separation power of at least 3 standard deviations.A sophisticated prototype was constructed and tested in a hadronic particle beam at CERN during the fall of 2017 to test the PID performance of the final design. [...]