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Title: Advancements in ion diode and triode design

Selfconsistent laminar flow models, which enable to predict the optimal cathode and anode geometry in simple diodes, must be modified to account for the anode aperture and the effect of other electrodes. An equation for charge coupled to arbitrary laminar flows is here first presented and its numerical solutions are obtained with a new method, based on mesh transformations. It is found that a close match to theoretical flows requires an increase of the simple diode voltage v{sub 0} by an amount v{sub δ}, which, for a typical case designed for zero exit angle condition, are v{sub 0} = 0.7465 and v{sub δ} = 0.0294 in adimensional units. States “in” and “out” for the anode lens are also shown, where “out” is a new and nonlinear solution for the beam expansion in a drift tube.
Authors:
 [1]
  1. INFN-LNL, viale dell'Universitá n.2, 35020 Legnaro (PD) (Italy)
Publication Date:
OSTI Identifier:
22253910
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 2; Conference: ICIS 2011: 14. international conference on ion sources, Giardini-Naxos, Sicily (Italy), 12-16 Sep 2011; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ANODES; APERTURES; CATHODES; DESIGN; DRIFT TUBES; ELECTRIC POTENTIAL; LAMINAR FLOW; LENSES