Beam Homogeneity Dependence on the Magnetic Filter Field at the IPP Test Facility MANITU

Journal Article · Mon Sep 26 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3637401· OSTI ID:21611676

Franzen, P; Fantz, U ^[1]

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1. Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, PO Box 1533, 85740 Garching (Germany)

The homogeneity of the extracted current density from the large RF driven negative hydrogen ion sources of the ITER neutral beam system is a critical issue for the transmission of the negative ion beam through the accelerator and the beamline components. As a first test, the beam homogeneity at the IPP long pulse test facility MANITU is measured by means of the divergence and the stripping profiles obtained with a spatially resolved Doppler-shift spectroscopy system. Since MANITU is typically operating below the optimum perveance, an increase in the divergence corresponds to a lower local extracted negative ion current density if the extraction voltage is constant. The beam H{sub {alpha}} Doppler-shift spectroscopy is a rather simple tool, as no absolute calibration - both for the wavelength and the emission - is necessary. Even no relative calibration of the different used lines of sight is necessary for divergence and stripping profiles as these quantities can be obtained by the line broadening of the Doppler-shifted peak and the ratio of the integral of the stripping peak to the integral of the Doppler-shifted peak, respectively. The paper describes the H{sub {alpha}} MANITU Doppler-shift spectroscopy system which is now operating routinely and the evaluation methods of the divergence and the stripping profiles. Beam homogeneity measurements are presented for different extraction areas and magnetic filter field configurations both for Hydrogen and Deuterium operation; the results are compared with homogeneity measurements of the source plasma. The stripping loss measurements are compared with model calculations.

• OSTI ID: 21611676
• Journal Information: AIP Conference Proceedings, Vol. 1390, Issue 1; Conference: 2. international symposium on negative ions, beams and sources, Takayama City (Japan), 16-19 Nov 2010; Other Information: DOI: 10.1063/1.3637401; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
43 PARTICLE ACCELERATORS
ACCELERATORS
ANIONS
CALIBRATION
CURRENT DENSITY
DEUTERIUM
DOPPLER EFFECT
ELECTRIC POTENTIAL
ELECTRON SOURCES
HYDROGEN
HYDROGEN IONS
ION SOURCES
ITER TOKAMAK
LINE BROADENING
MAGNETIC FILTERS
PLASMA
PLASMA DENSITY
RF SYSTEMS
STRIPPING
TEST FACILITIES
CHARGED PARTICLES
CLOSED PLASMA DEVICES
DIRECT REACTIONS
ELEMENTS
FILTERS
HYDROGEN ISOTOPES
IONS
ISOTOPES
LIGHT NUCLEI
NONMETALS
NUCLEAR REACTIONS
NUCLEI
ODD-ODD NUCLEI
PARTICLE SOURCES
RADIATION SOURCES
STABLE ISOTOPES
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTORS
TOKAMAK DEVICES
TOKAMAK TYPE REACTORS
TRANSFER REACTIONS