Measurement of the space charge effect of a negative hydrogen ion beam

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Abstract

A source of epithermal neutrons based on a vacuum-insulated tandem accelerator and a lithium target is developed for the technique of boron neutron capture therapy. A 2 MeV stationary proton beam with a current of up to 5 mA was obtained in the accelerator. With a view of increasing the current, the transport of a beam of negative hydrogen ions from the ion source to the accelerator is studied using a wire scanner OWS-30 (D-Pace, Canada) and a movable diaphragm. Dependences of the ion beam profile and the current on the residual gas pressure are measured and the influence of the space charge is detected. We measured the phase portrait of the beam in the radial and azimuth directions and discovered the effect produced by the aberrations of the focusing magnetic lens. We also gaged the value of the normalized beam emittance. The change in beam focusing mode and the introduction of optical diagnostics of the beam position in the diaphragm of the first accelerating electrode made it possible to significantly improve the stability of the accelerator operation at high current of the proton beam, up to 6.7 mA.

Original languageEnglish
Title of host publication6th International Symposium on Negative Ions, Beams and Sources, NIBS 2018
EditorsY Belchenko, A Sanin
PublisherAmerican Institute of Physics Inc.
Number of pages7
Volume2052
ISBN (Electronic)9780735417809
DOIs
Publication statusPublished - 28 Dec 2018
Event6th International Symposium on Negative Ions, Beams and Sources, NIBS 2018 - Academgorogok, Novosibirsk, Russian Federation
Duration: 3 Sep 20187 Sep 2018

Publication series

NameAIP Conference Proceedings
PublisherAMER INST PHYSICS
Volume2052
ISSN (Print)0094-243X

Conference

Conference6th International Symposium on Negative Ions, Beams and Sources, NIBS 2018
CountryRussian Federation
CityAcademgorogok, Novosibirsk
Period03.09.201807.09.2018

Keywords

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    Bykov, T., Kasatov, D., Kolesnikov, I., Koshkarev, A., Makarov, A., Ostreinov, Y., Shchudlo, I., Sokolova, E., Sorokin, I., & Taskaev, S. (2018). Measurement of the space charge effect of a negative hydrogen ion beam. In Y. Belchenko, & A. Sanin (Eds.), 6th International Symposium on Negative Ions, Beams and Sources, NIBS 2018 (Vol. 2052). [070004] (AIP Conference Proceedings; Vol. 2052). American Institute of Physics Inc.. https://doi.org/10.1063/1.5083784