Hydrogen and deuterium ion species mix and injected neutral beam power fractions of the TEXTOR--PINIs for 20--60 kV determined by Doppler shift spectroscopy

Journal Article · Thu Apr 01 00:00:00 EST 1993 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1144100· OSTI ID:5405150

Uhlemann, R; Hemsworth, R S; Wang, G; Euringer, H ^[1]

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1. Institut fuer Plasmaphysik, Forschungszentrum Juelich GmbH, Association EURATOM-KFA, P.O.B. 1913, D-5170 Juelich (Germany)

The ion species fractions of the multimegawatt neutral beam ion sources for Torus Experiment for Technological Oriented Research (TEXTOR) were determined by [ital H][sub [alpha]]/[ital D][sub [alpha]]-light Doppler shift spectroscopy. The ion sources are modified Joint European Torus (JET) plug in neutral injectors (PINIs) with a three-grid acceleration system and a magnetic field in the plasma box produced by permanent magnets in checkerboard arrangement. The ion species mix of the extracted beam was measured for energies of 20--60 keV and beam currents of 13--100 A of hydrogen and deuterium produced by the two ion sources (PINI) mounted on the neutral beam injectors of TEXTOR. The maximum H[sup +]/D[sup +] fraction at full power operation is 66%--69%. No significant difference between the two ion sources was found. The results of the hydrogen ion species mix are in good agreement with prior optical and momentum analysis made on the NI-Testbed. The additionally measured dependence of the extracted species mix from the source gas pressure is small in the pressure range above 3 [mu]bar where the ion sources are usually operated. Measurements over the beam pulse length from 0.1 to 3 s show no change in the species mix. For calculating the deuterium ion species mix at low energies, several cross sections for [ital H][sub [alpha]]-light excitation, charge exchange, and dissociation available from the literature were extrapolated to about 3 keV per nucleon.

• OSTI ID: 5405150
• Journal Information: Review of Scientific Instruments; (United States), Vol. 64:4; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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TEXTOR TOKAMAK
NEUTRAL BEAM SOURCES
DEUTERIUM
DOPPLER EFFECT
HYDROGEN IONS 1 PLUS
ISOTOPE RATIO
NEUTRAL ATOM BEAM INJECTION
BEAM INJECTION
CATIONS
CHARGED PARTICLES
CLOSED PLASMA DEVICES
HYDROGEN IONS
HYDROGEN ISOTOPES
IONS
ISOTOPES
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
STABLE ISOTOPES
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