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  • 1
    Electronic Resource
    Electronic Resource
    Development of the radio frequency driven H− ion source for the National Spallation Neutron Source : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 962-964 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The ion source for the 1 MW National Spallation Neutron Source (NSNS) is required to provide 35 mA of H− beam current (1 ms pulses at 60 Hz) at 65 keV with a normalized root-mean-square emittance of 〈0.2 pi mm mrad. The same ion source should be able to produce 70 mA of H−at 6% duty factor when the NSNS is upgraded to 2 MW of power. For this application, a radio-frequency driven, magnetically filtered multicusp source is being developed at Lawrence Berkeley National Laboratory. The design of this R and D ion source, which is equipped with a cesium dispenser-collar, a fast ion beam prechopper (rise times 〈100 ns) and a strong permanent-magnet insert for electron deflection, will be presented.© 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148703
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  • 2
    Electronic Resource
    Electronic Resource
    Development of the next generation H− ion source for the LANSCE facility : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 989-991 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The upgrade of the Los Alamos Neutron Science Center (LANSCE) will require an ion source producing high intensity H− beams. The new LANSCE source in particular will need to generate 40 mA of H− beam current at a duty factor of 12% (1 ms pulse at 120 Hz). To achieve this, the present Los Alamos results were first reproduced employing a prototype surface conversion source similar to the existing LANSCE source. Using these results as a benchmark for further testing, it was discovered that by moving the filament cathode into the chamber's cusp-field, the H− ion yield was enhanced. Considering this result, two extension chambers were added with movable magnetic filters at each end of the source to further improve the H− beam current. In addition, construction has been started on a new prototype axial source which will enable more plasma ions to funnel across the filter field into the central region where the converter is located. Results of the magnetic filter operation as well as the new axial source design will be presented. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148704
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A 2.45 GHz ECR ion source for production of medium charge states ions : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 712-714 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: At the Lawrence Berkeley National Laboratory we are constructing an ECR ion source test facility for nuclear science as well as industrial applications experiments. For these purposes, a single-stage 2.45 GHz electron cyclotron resonance ion source has been designed and constructed. It features an axial magnetic field with a mirror ratio of up to six and a hexapole field produced by a simple Nd–Fe–B permanent magnet assembly. In order to enhance the ion confinement time, the source plasma volume has been enlarged as much as possible while still maintaining a high mirror ratio. This paper describes the design of the ion source, the extraction system and the test stand. First, operational experience and experimental results with an argon discharge are presented. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148466
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  • 4
    Electronic Resource
    Electronic Resource
    Simulation of the low energy H− injector into the National Spallation Neutron Source radio frequency quadrupole accelerator : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 965-967 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The low energy beam transport system (LEBT) for the National Spallation Neutron Source is required to transport 35 mA of a 65 keV H− ion beam from the ion source to the radio frequency quadrupole accelerator (RFQ) entrance with a normalized root-mean-square emittance 〈 0.15 pi mm mrad. At a later time, it is anticipated that this beam current will be increased to 70 mA. For this purpose a radio-frequency driven, magnetically filtered multicusp ion source is under development at LBNL. The H− beam extraction from the ion source is being simulated utilizing the three-dimensional (3D) computer code ARGUS. H− ion beam extraction from the ion source requires proper simulation of the extraction of both plasma electrons and the desired H− ions. The goal is to optimize the LEBT system so that the electrons are completely deflected between the first two electrodes and the desired H− beam is properly matched into the RFQ accelerator. The magnetic field in the extraction region is being optimized by using the 3D magnetic code OPERA3D. The performance of the all electrostatic LEBT for the transport of higher currents (〉70 mA) is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148743
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    Paper (German National Licenses)
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