Development of a miniaturized duoplasmatron ion source

Abstract

A miniature sized duoplasmatron ion source mountable on a standard 34 mm diameter copper gasket flange was designed, and its performance was tested. A hollow cathode exited a stable discharge in the anode through a 3 mm diameter orifice of the intermediate electrode with less than 10 W discharge power for Ar. The extracted ion beam current was larger at a smaller discharge current and was maximum at 5 mA below, where the discharge became unstable. A Faraday cup located 200 mm downstream of the extractor detected 1 µA beam current at 5 mA discharge current with 390 V discharge voltage and 2 kV extraction potential. The source required higher discharge voltage for operation of hydrogen gas.

Plasma Excitation in a DC Linear Magnetic Field by a Duoplasmatron Plasma Cathode

“…They produced a dilute plasma downstream, and the tungsten target showed a negative floating potential indicating the ion beam reaching the target was smaller than the thermal electron current from the ion beam produced plasma. Part of the reason for the inefficient positive ion transport down to the target is the large beam divergence of this type of ion source for the operation with a low extraction potential [12]. The extraction geometry has to be modified if the present source will serve as a positive ion source.…”

Optimization and analysis of a low-energy injector for high-intensity proton beam

“…Duoplasmatron sources are commonly used in proton linacs due to their good performance and reliability [11][12][13][14]. A duoplasmatron source with triode conical electrodes is used in the NPS project to provide 65 keV, 40 mA beam.…”

Source of pure proton beams

“…Traditionally, several types of ion sources are used to inject proton beams into accelerators, differing both in the method of creating plasma (arc [7], ECR [8], Penning [9], etc.) and in the parameters of the produced beams.…”