Articles you may be interested in 3D numerical simulations of negative hydrogen ion extraction using realistic plasma parameters, geometry of the extraction aperture and full 3D magnetic field mapa) Rev. Sci. Instrum. 85, 02B301 (2014); 10.1063/1.4824746 Simulating ion beam extraction from a single aperture triode acceleration column: A comparison of the beam transport codes IGUN and PBGUNS with test stand data Rev. Sci. Instrum. 79, 043304 (2008); 10.1063/1.2908170 A 3D computer simulation of negative ion extraction influenced by electron diffusion and weak magnetic field AIP Conf.

Recombination of Au 25+ ions with free electrons has been investigated in a mergedbeams experiment at the UNILAC of GSI in Darmstadt. Special emphasis was put on the recombination at very low energies in the electron-ion centre-of-mass frame. At E rel = 0 eV we found an enormous recombination rate exceeding the theoretical expectations for radiative recombination by a factor of 365. For further investigation of this enhancement, the electron density and the magnetic field guiding the electron beam were varied. While an increase of the electron density by a factor of 10 had little influence, the measured rate coefficient increased significantly with the magnetic field strength.

Absolute measurements have been made of cross sections for the ionisation of Li2+ ions by electrons with energies which range from threshold (122.45 eV) to 1000 eV. The results are in good agreement with available distorted-wave exchange calculations. The scaling behaviour of ionisation cross sections along the hydrogen isoelectronic sequence is discussed.11 This work contains parts of K Tinschert's thesis, Giessen D26.

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