Search results for "Helium ionization detector"

showing 3 items of 3 documents

RILIS-ionized mercury and tellurium beams at ISOLDE CERN

2017

This paper presents the results of ionization scheme development for application at the ISOLDE Resonance Ionization Laser Ion Source (RILIS). Two new ionization schemes for mercury are presented: a three-step three-resonance ionization scheme, ionizing via an excitation to a Rydberg level and a three-step two-resonance ionization scheme, with a non-resonant final step to the ionization continuum that corresponded to a factor of four higher ionization efficiency. The efficiency of the optimal mercury ionization scheme was measured, together with the efficiency of a new three-step three resonance ionization scheme for tellurium. The efficiencies of the mercury and tellurium ionization schemes…

Nuclear and High Energy PhysicsHelium ionization detectorchemistry.chemical_elementCondensed Matter Physics7. Clean energy01 natural sciencesAtomic and Molecular Physics and OpticsIon source010305 fluids & plasmasMercury (element)Atmospheric-pressure laser ionizationIonsymbols.namesakechemistryIonization0103 physical sciencesRydberg formulasymbolsPhysics::Atomic and Molecular ClustersPhysics::Atomic PhysicsPhysical and Theoretical ChemistryAtomic physics010306 general physicsTellurium
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Time-of-flight ERD with a 200mm2 Si3N4 window gas ionization chamber energy detector

2014

Abstract Low energy heavy ion elastic recoil detection work has been carried out in Jyvaskyla since 2009 using home made timing detectors, a silicon energy detector and a timestamping data acquisition setup forming a time-of-flight–energy telescope. In order to improve the mass resolution of the setup a new energy detector was designed to replace the silicon solid state detector, which suffered from radiation damage and had poor resolution for heavy recoils. In this paper the construction and operation of an isobutane filled gas ionization chamber with a 14 × 14 mm 2 100 nm thick silicon nitride window are described. In addition to greatly improved energy resolution for heavy ions, the dete…

Nuclear and High Energy PhysicsRange (particle radiation)Materials scienceta114SiliconPhysics::Instrumentation and Detectorsbusiness.industryDetectorHelium ionization detectorchemistry.chemical_elementNuclear physicsElastic recoil detectionTime of flightOpticschemistryIonization chamberbusinessDischarge ionization detectorInstrumentationNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
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A large-area transition radiation detector

1990

Abstract The construction and the operation of a large-area transition radiation detector (TRD) for the NA31 experiment at CERN are described. The TRD incorporates several novel features for stabilizing the detector response. The density of the gas mixture (xenon+helium+methane) in the detection chambers is matched to the carbon dioxide gas in the surrounding radiators by tuning the helium concentration to avoid a hydrostatic pressure difference, which would deform the chamber walls. The chamber pressure is continuously regulated by computer control to maintain it to within 1 μbar of the radiator pressure. The gas gain of each of the four chambers is regulated to better than 0.2% by changin…

PhysicsNuclear and High Energy PhysicsPhysics::Instrumentation and Detectorsbusiness.industryHelium ionization detectorDetectorHydrostatic pressurechemistry.chemical_elementMethaneChamber pressureNuclear physicschemistry.chemical_compoundTransition radiation detectorXenonOpticschemistryDetectors and Experimental TechniquesbusinessInstrumentationHelium
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