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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 7061-7068 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Focusing of heavy-ion beams on an indirectly driven inertial fusion target can be achieved, in principle, under vacuum conditions in the reactor chamber. Due to performance limitations in the storage rings of the driver accelerator, a relatively large number of small emittance beams is required. We suggest that the effect of space charge can be described in terms of three distinct mechanisms: an increase of the entrance divergence angle; a current sensitivity of the focal spot; and the effect of a nonuniform distribution. The first two can be calculated by means of an envelope model. The resulting current sensitivity formula is confirmed by a computer simulation taking into account the correct Coulomb forces between interacting beamlets. We find that for propagation in vacuum the current sensitivity is considerable, in particular for charge states Z≥1, since the spot size blow-up scales like Z4/A2. The effect depends on the total current in a bundle—and not the number of beamlets in it—and thus determines how many bundles have to be used. Possible cures are briefly discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 325 (1986), S. 357-362 
    ISSN: 1434-601X
    Keywords: 25.85.Ec
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The structures in the total kinetic energy (TKE) distributions in cold fission of234U and236U are interpreted in terms of the Coulomb interaction energy (C) between fragments at the scission point. The maximal value ofC, C max, corresponding to the most compact scission configuration, is calculated for several mass fragmentations. It is shown that withQ being constant,C max increases if one increases the charge asymmetry for a given primary fragmentation. This condition produces oscillations with a period of approximately 5 amu ofC max as a function of the light fragment mass which are correlated with the observed oscillations of the maximal value of TKE. Moreover, the enhancement of the yields of the more asymmetric charge fragmentation for a given fragmentation is explained.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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