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Measurements with a Detector System for Low Energy Hydrogen

Measurements with a Detector System for Low Energy Hydrogen. Topcis General Overview of the Experiment Mean Parameters of the Scintillator Material Experimental Results Comparision between Hydrogen and Uranium. Group members: C. Gabor O. Meusel J. Pozimski H. Klein U. Ratzinger

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Measurements with a Detector System for Low Energy Hydrogen

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  1. Measurements with a Detector System for Low Energy Hydrogen Topcis General Overview of the Experiment Mean Parameters of the Scintillator Material Experimental Results Comparision between Hydrogen and Uranium Group members: C. Gabor O. Meusel J. Pozimski H. Klein U. Ratzinger Work supported by HPRI-CT-2001-50021

  2. Nondestructive H– Beam EmittanceMeasurement -> driven by neutralization of photodetachment -> peak cross section σ = 4*10-17 cm2 at wavelength of 830 nm

  3. Experimental setup: Overview

  4. Prelimary Experiment (With the help and Acknowledgment of GSI) Main Parameters -> Phosphor material -> Grain size (and number of the layer) of the phosphor screen -> Thickness of the layer -> Coating (Al reflection layer) -> Mechanic stability (water glass) -> electric contact necassary ? Proton current <70µA 6 keV beam energy • Simulations (with TRIM/ SRIM) are reasonable !

  5. Scintillator Material ~ Efficiency ~ Emission spectrum ~ Luminescense decay time QE > 70% of CCD: 500.....750nm -> Max. thickness d ~ 100µm -> Grain size > 1µm -> 3-4 layer of phosphor grains

  6. Principle: Nuclear and Electronic Energy Stopping Power Stopping Cross Section

  7. Energy Stopping Power of Hydrogen in Scintillator Material SRIM simulation: Hydrogen in Scintillator material => Thickness and grain size

  8. Coating layer: Aluminium Al can improove the photon luminosity

  9. Fotos: CCD camera + laser entrance window

  10. Detector system, Raw Data and Smooth Function Screen images shown in fals colors Two-dimensional gaussian fit-function Dimensions depends of the zoom lens (aperture, distance)

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