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Attenuation effects in accelerated cluster‐ion beams

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2 Author(s)
Moser, H.O. ; Kernforschungszentrum Karlsruhe, Institut für Kernverfahrenstechnik, Postfach 3640, D‐7500 Karlsruhe 1, Federal Republic of Germany ; Krevet, B.

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Intense energetic beams of hydrogen cluster ions characterized by an atom flux density of several A0/cm2, a kinetic energy per atom of several eV, and a number of atoms per charge in the cluster ions of about 105 are markedly influenced by collisions of the cluster ions among themselves and with background gas particles. This is demonstrated by acceleration of a partially ionized cluster beam with high voltages in the range of 75–350 kV and measurement of the attenuation of the neutral component. The attenuation varies exponentially with the ionizing electron current; the attenuation constant b is proportional to U1.7a , where Ua is the acceleration voltage. Straightforward extrapolation of  b to the conditions prevailing in fully ionized cluster beams leads to attenuations down to about 20% which is not too far from the measured value scattering around 40%.

Published in:

Journal of Applied Physics  (Volume:58 ,  Issue: 2 )

Date of Publication:

Jul 1985

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