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  • American Institute of Physics (AIP)  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Basic processes of negative hydrogen ion production and destruction in sources and beams (invited) : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1138-1143 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This article contains the discussion of new discoveries and ideas relevant to volume H− ion sources and beams. Recent research in laser irradiated H2 by Pinnaduwage and Christophorou has shown that the rates of dissociative attachment are strongly dependent on electronic excitation involving superexcited states and possibly Rydberg states. The observation of anomalous attenuation of a 15 keV H− beam in a hydrogen gas target led us to consider the possibility of secondary H− stripping processes, related to low-energy interactions between primary H− ions and the secondary H+, H0, and electron beams produced by primary stripping. The results of the investigation by electrostatic probes and by photodetachment of the properties of a hydrogen/deuterium multicusp ion source plasma when seeded with cesium vapor are reported. We found that the negative ion/electron density ratio is enhanced by cesium seeding, particularly at low pressure (a factor of 4 at 1 mTorr), while both the electron temperature and the electron density are reduced. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146770
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  • 2
    Electronic Resource
    Electronic Resource
    Measurement of H− ion density by laser photodetachment in a cesium–hydrogen plasma (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 4925-4927 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The standard photodetachment method was applied for the diagnostic of negative ions in a cesium–hydrogen plasma. The plasma generator studied is a steady-state source of hydrogen negative ions with a cesium hollow cathode and a radial magnetic field. We demonstrate the possibility of using the photodetachment method for the diagnostics of cesium–hydrogen plasma. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146176
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of cesium and xenon seeding in negative hydrogen ion sources : The 8th international conference on ion sources (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 1082-1085 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: It is well known that cesium seeding in volume hydrogen negative ion sources leads to a large reduction of the extracted electron current and in some cases to the enhancement of the negative ion current. The cooling of the electrons due to the addition of this heavy impurity was proposed as a possible cause of the mentioned observations. In order to verify this assumption, we seeded the hydrogen plasma with xenon, which has an atomic weight almost equal to that of cesium. The plasma properties were studied in the extraction region of the negative ion source Camembert III using a cylindrical electrostatic probe while the negative ion relative density was studied using laser photodetachment. It is shown that the xenon mixing does not enhance the negative ion density and leads to the increase of the electron density, while the cesium seeding reduces the electron density. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150391
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of cesium seeding on hydrogen negative ion volume production : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 932-934 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The effect of cesium vapor partial pressure on the plasma parameters has been studied in a dc hydrogen negative ion source. The cesium vapor pressure was varied up to 10−5 Torr and was determined by a surface ionization gauge in the absence of the discharge. Due to cesium seeding the negative ion relative density in the center of the plasma extraction region increases by a factor of 4, while the electron density decreases. The negative ion density increase is highest (a factor of 2) at the lowest hydrogen pressure. The velocity of the directed negative ion flow to the plasma electrode is also increased by the cesium seeding. Due to these factors the negative ion current is enhanced. A dramatic reduction of the electron component, which is consistent with the reduced electron density and temperature, is also observed. An enhancement of the volume production seems to occur in this type of plasma. Possible mechanisms for this type of volume process will be discussed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148595
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