Search results for "positron: yield"

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Positron production using a 9 MeV electron linac for the GBAR experiment

2020

For the GBAR (Gravitational Behaviour of Antihydrogen at Rest) experiment at CERN's Antiproton Decelerator (AD) facility we have constructed a source of slow positrons, which uses a low-energy electron linear accelerator (linac). The driver linac produces electrons of 9 MeV kinetic energy that create positrons from bremsstrahlung-induced pair production. Staying below 10 MeV ensures no persistent radioactive activation in the target zone and that the radiation level outside the biological shield is safe for public access. An annealed tungsten-mesh assembly placed directly behind the target acts as a positron moderator. The system produces $5\times10^7$ slow positrons per second, a performan…

safetyAntimatterNuclear and High Energy PhysicsCERN LabPhysics - Instrumentation and DetectorstungstenPositronAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesElectron01 natural sciences7. Clean energyLinear particle acceleratorpositron: particle source010305 fluids & plasmaselectron: pair productionNuclear physicselectron: linear acceleratorPositronPositron; Linear accelerator; Antimatter; Antihydrogen; Gravitation0103 physical sciences[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]Detectors and Experimental TechniquesNuclear Experiment010306 general physicsAntihydrogenphysics.ins-detInstrumentationenergy: lowantihydrogenPhysicsLarge Hadron Collidergravitation 2Instrumentation and Detectors (physics.ins-det)linear acceleratorAntiproton DeceleratorPair productionradioactivityAntimattergravitation: accelerationPhysics::Accelerator PhysicsHigh Energy Physics::Experimentperformancepositron: yieldGravitationNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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