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TY - UNPB AU - Ostreinov, Y.M. AU - Kasatov, D.A. AU - Makarov, A.N. AU - Shchudlo, I.M. ED - Kuzin, Maxim ED - Schaa, Volker RW TI - Reducing of Accompanied Electrons in the Tandem Accelerator by Magnetic Field J2 - Proc. of RuPAC2016, St. Petersburg, Russia, November 21-25, 2016 C1 - St. Petersburg, Russia T2 - Russian Particle Accelerator Conference T3 - 25 LA - english AB - In the BINP SB RAS was created a source of epithermal neutrons for BNCT. The proton beam is obtained by stripping negative hydrogen inside gas target. Using the gas target leads to interaction of injected beam with gas and producing unwanted flow of electrons in accelerating channel. Occurred electrons are accelerated up to 1 MeV energy, bombard the electrodes and produce radiation. For suppressing of electrons, electrodes diaphragm with magnets was designed. Diaphragm was set on first electrode, where electrons have low (166 keV) energy. The field about 15 mT separate main beam particles and electrons on 2 components. Thus, the main beam passes freely through diaphragm and accelerates, and electrons beam, with low energy, land on the first electrode. This article shows that the setting of diaphragm with magnets conduct to ~30% decreasing of radiation dose. Also, we discussed negative sides and technical solutions of this modification, such as reducing of potential on first electrode by electrons or demagnetization magnets by the beam. PB - JACoW CP - Geneva, Switzerland ER -