https://doi.org/10.1140/epjd/e2015-50718-3
Regular Article
Incident beam intensity dependence of the charge-up process of the guiding of 1 MeV proton microbeam through a Teflon microcapillary*
Institute for Nuclear Research, Hungarian Academy of Sciences (Atomki), 4026 Bem tér 18/c, Debrecen, Hungary
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Received: 30 September 2014
Received in final form: 3 January 2015
Published online: 10 April 2015
Abstract
The ion guiding phenomenon was studied in the case of a single, straight, micrometer sized insulator capillary using a micro focused 1 MeV proton beam. The axis of the incident ion beam was tilted to 1° relative to the axis of the capillary. The aspect ratio of the target and the small beam divergence ensured the geometrical non-transparency of the capillary for the incoming beam. The intensity of the beam transmitted through the capillary was measured as the function of time and as a function of the incident beam intensity. At each constant incident beam intensities the time required for the charge-up process of the stable transmission was determined. We found that the time required to establish a stable guided transmission decreases reciprocally with the increasing incident beam current.
Contribution to the Topical Issue “Elementary Processes with Atoms and Molecules in Isolated and Aggregated States”, edited by Friedrich Aumayr, Bratislav Marinkovic, Štefan Matejčik, John Tanis and Kurt H. Becker.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2015
