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  • 1
    Electronic Resource
    Electronic Resource
    Development of a high proton yield plasma source with multipole confinement and a magnetic filter (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 1369-1381 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Proton yields in magnetic multipole sources can be increased by the creation of a magnetic "filter'' within the discharge volume, although this may introduce nonuniformity in the plasma. We have investigated the properties of a filter which can satisfy the requirements of plasma uniformity and discharge electrical efficiency and creates a proton yield of 87% when a 60-A beam is extracted at 80 keV. A model describing the behavior of the filter is also described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139417
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Recent results on negative ion production and extraction from the Culham Ion Source Test Stand : International conference on ion sources (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 412-414 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The plasma characteristics of a volume negative ion source are described. An indirect measurement of the negative ion current density in the source has been made. Beam extraction measurements are used to attempt to verify the measurement in the source. The two are found to be in proportion. The difference between the two is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141256
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  • 3
    Electronic Resource
    Electronic Resource
    Extraction of H− and D− ions from a large magnetic multipole source (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 223-234 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Results are presented on the production of H− ions in a large (55×31×20 cm3) magnetic multipole discharge, which is sufficiently large to act as the plasma generator for a neutral beam injector. H− ion current densities up to 57 mA/cm2 have been extracted in pulses up to 3 s in length at low energies. When the discharge is operated in deuterium, a maximum D− current density of 27 mA/cm2 is obtained. The scaling laws of the H− production are consistent with production by dissociative attachment to rovibrationally excited molecules and loss by mutual recombination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139312
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Development of large area rf ion sources for fusion applications : Proceedings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2735-2737 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A rf ion source with a large extraction area suitable for fusion applications is considered. The source is a metallic magnetic multipole bucket with an internal antenna to couple the rf (at a frequency of 2 MHz) to the plasma. The source is diagnosed by an array of Langmuir probes to measure uniformity, density, and temperature and a small probe accelerator to extract a negative ion beam. A two-turn antenna is found to couple more power into the plasma than a half-turn antenna. When operated as a negative ion source at low powers, the source efficiency is found to be high and not to have a strong dependence on gas pressure. An extracted negative ion current density of about 4 mA/cm2 at 7 mTorr was obtained when 3 kW of power was coupled into the plasma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142839
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  • 5
    Electronic Resource
    Electronic Resource
    Electron suppressors for negative ion sources (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2176-2183 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Two designs of electron suppressor have been tested in a volume negative ion source operating dc with a large extraction aperture diameter (16 mm). Both suppressors employ magnetic fields to divert the electrons near the extraction aperture onto collector electrodes. However, while one suppressor uses a fixed field produced by permanent magnets, the other employs a variable field produced by a solenoidal coil. These suppressors allow low values (3–4:1) of extracted electron to ion currents to be obtained. The results are compared with a diffusion model and a hydrodynamic model of the transport of the electrons across the magnetic field. They show that the hydrodynamic model gives a good description of the suppression and transport of the electrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141386
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  • 6
    Electronic Resource
    Electronic Resource
    Hydrogen/deuterium negative ion scaling from a magnetic multipole ion source (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1777-1782 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: H−/D− current and emittance scaling is measured in a magnetic multipole negative ion source. The gas in the source is the only difference as no reoptimization of the source is carried out, thus giving a direct comparison of the performance for the two isotopes. It is found that the H− current is greater than the D− current by approximately a factor of 2 under the same discharge conditions. The extracted electron to ion ratio is commensurately higher in deuterium than in hydrogen. Finally, the emittance in deuterium at the higher arc currents is found to be lower than that in hydrogen. Some comments are made on the scaling within the context of the accepted model of negative ion production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143337
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    Paper (German National Licenses)
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