Author: Kasatov, D.A.
Paper Title Page
THCEMH01 Vacuum Insulation Tandem Accelerator: Progress and Prospects 147
 
  • S.Yu. Taskaev, A.A. Ivanov, D.A. Kasatov, A.N. Makarov, Y.M. Ostreinov, I.M. Shchudlo, I.N. Sorokin, T. Sycheva
    BINP SB RAS, Novosibirsk, Russia
  • T.A. Bykov
    Budker INP & NSU, Novosibirsk, Russia
  • A.A. Ivanov, Ya.A. Kolesnikov, A.M. Koshkarev, E.O. Sokolova, S.Yu. Taskaev
    NSU, Novosibirsk, Russia
 
  Funding: The study was supported by the grants from the Ministry of Science of the Russian Federation, the Russian Science Foundation, Budker Institute of Nuclear Physics and Novosibirsk State University.
A promising method of treatment of many malignant tumors is the boron neutron capture therapy (BNCT)*. It provides a selective destruction of tumor cells by prior accumulation of a stable boron-10 isotope inside them and subsequent irradiation with epithermal neutrons. It is expected that accelerator based neutron sources will be created for the clinical practice. One such source could be an original source of epithermal neutrons**, created in BINP. To obtain proton beam a new type of particle accelerator is used - tandem accelerator with vacuum insulation. Generation of neutrons is carried out as a result of the threshold reaction 7Li(p, n)7Be. During 2015-2016 in the construction of tandem accelerator with vacuum insulation several changes were made. This allowed us to suppress the unwanted flow of charged particles in the accelerator, to improve its high-voltage stability, and to increase the proton beam current from 1.6 to 5 mA. Such current value is sufficient for BNCT. The report describes in detail the modernization of the accelerator, presents and discusses the results of experiments on obtaining the proton beam and the formation of neutron flux using lithium target, and declares our prospective plans. The obtained neutron beam meets the requirements of BNCT: the irradiation of cell cultures provides the destruction of cells with boron and preservation of cells without boron. Irradiation of immunodeficient mice with grafted glioblastoma results in their recovery.
*Neutron Capture Therapy. Principles and Applications. Eds: W. Sauerwein, A. Wittig, R. Moss, Y. Nakagawa. Springer, 2012.
**S. Taskaev. Accelerator based epithermal neutron source. Physics of Particles and Nuclei 46 (2015) 956-990.
 
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WEPSB075 Beam Injector for Vacuum Insulated Tandem Accelerator 529
 
  • A.S. Kuznetsov, K.A. Blokhina, A.A. Gmyrya, A.V. Ivanov, D.A. Kasatov, A.M. Koshkarev, A.L. Sanin
    BINP SB RAS, Novosibirsk, Russia
  • K.A. Blokhina, A.A. Gmyrya
    NSTU, Novosibirsk, Russia
  • D.A. Kasatov, A.M. Koshkarev
    NSU, Novosibirsk, Russia
 
  Funding: Applied research is carrying out with the financial support of the Russian Federation represented by the Ministry of Education and Science of Russia (unique identifier RFMEFI60414X0066).
The Vacuum Insulated Tandem Accelerator is built at the Budker Institute of Nuclear Physics. The accelerator is designed for development of the concept of accelerator-based boron neutron capture therapy of malignant tumors in the clinic.* In the accelerator the negative hydrogen ions are accelerated by the high voltage electrode potential to the half of required energy, and after conversion of the ions into protons by means of a gas stripping target the protons are accelerated again by the same potential to the full beam energy. During the facility development, the proton beam was obtained with 5 mA current and 2 MeV energy**. To ensure the beam parameters and reliability of the facility operation required for clinical applications, the new injector was designed based on the ion source with a current up to 15 mA***, providing the possibility of preliminary beam acceleration up to 120-200 keV. The paper presents the status of the injector construction and testing.
*B.F.Bayanov, et al. Nuclear Instr. and Methods in Physics Research A 413/2-3 (1998) 397-426.
**A. Ivanov, et al. Journal of Instrumentation 11 (2016) P04018.
***Yu. Belchenko, et al. AIP Conference Proceedings 1097, 214 (2009); doi: 10.1063/1.3112515
 
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THPSC032 The Study of the Electrical Strength of Selected Insulators With a Different Shape of the Surface 615
 
  • Ya.A. Kolesnikov, D.A. Kasatov, A.M. Koshkarev, A.S. Kuznetsov, A.N. Makarov, I.M. Shchudlo, I.N. Sorokin, S.Yu. Taskaev
    BINP SB RAS, Novosibirsk, Russia
  • A.A. Gmyrya
    BINP & NSTU, Novosibirsk, Russia
  • D.A. Kasatov, A.M. Koshkarev
    NSU, Novosibirsk, Russia
  • E.O. Sokolova
    Budker INP & NSU, Novosibirsk, Russia
 
  Funding: Ministry of Science of the Russian Federation, unique identifier of applied research RFMEFI60414X0066.
In the BINP SB RAS was proposed and created a source of epithermal neutrons for BNCT. The proton beam is obtained on a tandem accelerator with vacuum insulation. Sectionalized demountable feed through insulator is an integral part of the accelerator. Voltage from the high voltage source is distributed to the electrodes via resistive divider. Because of the small amount of current (hundreds of microamperes) flowing through the divider, dark currents that occur in the accelerating gaps, can significantly affect the uniform distribution of the potential along the accelerating channel, and, consequently, on the beam transportation. Therefore there is a need to change the design of the feed through insulator which will allow to set potentials at the electrodes directly from the high voltage rectifier sections. To study the feasibility of such changes has been designed and built an experimental stand, in which a single insulator with double height subjected to the same conditions as in accelerator. On the experimental stand was studied electrical strength of ceramic and polycarbonate insulators with a different shape of the surface. The paper presents the results of experimental studies of insulators. Their application will get rid of the voltage divider inside the feed through insulator and realize the scheme which allows to set potential on the electrode gaps directly from the rectifier section. This will increase the operating voltage of the accelerator and its reliability.
 
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THPSC033 Obtainment of 5 mA 2 MeV Proton Beam in the Vacuum Insulation Tandem Accelerator 618
 
  • I.M. Shchudlo, D.A. Kasatov, A.M. Koshkarev, A.N. Makarov, Y.M. Ostreinov, I.N. Sorokin, S.Yu. Taskaev
    BINP SB RAS, Novosibirsk, Russia
 
  Funding: The study was supported by the grants from the Russian Science Foundation (Project No.14-32-00006), Budker Nuclear Institute and Novosibirsk State University
In BINP the neutron source for BNCT based on proton accelerator was designed and built. It is necessary for the therapy to ensure a stable proton beam current of not less than 3 mA with energy 2 MeV. During the injection of negative hydrogen ion beam into the accelerator the unwanted charged particles are produced, affecting the stability of beam parameters. The article describes meth-ods of suppression of undesirable charged particles and the results of experiments.
 
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THPSC034
Reducing of Accompanied Electrons in the Tandem Accelerator by Magnetic Field  
 
  • Y.M. Ostreinov, D.A. Kasatov, A.N. Makarov, I.M. Shchudlo
    BINP SB RAS, Novosibirsk, Russia
 
  Funding: The study was supported by the grants from the Russian Science Foundation (Project No.14-32-00006), Budker Nuclear Institute and Novosibirsk State University.
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.
 
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THPSC069 Measurement of the Ion Beam Profile with the D-Pace Wire Scanner 695
 
  • E.O. Sokolova
    Budker INP & NSU, Novosibirsk, Russia
  • D.A. Kasatov, Ya.A. Kolesnikov, A.M. Koshkarev, A.S. Kuznetsov, A.N. Makarov, I.M. Shchudlo, I.N. Sorokin, S.Yu. Taskaev
    BINP SB RAS, Novosibirsk, Russia
 
  Funding: The study was supported by grants from the Russian Science Foundation (Project no. 14-32-00006) and the Budker Institute of Nuclear Physics and the Novosibirsk State University.
In The Budker Institute of Nuclear Physics the accelerator-based source of epithermal neutrons was invented and now operates to be used in the boron neutron capture therapy. For several reasons the real beam flow in the facility differs from the calculated one. To take into account this distinction it is necessary to provide continuous monitoring of the beam parameters. In order to optimize the facility operation the beam should be followed not only during the formation but also while an acceleration takes place and the proton beam is thrown on the lithium target as the proton current and energy influence on the neutron output. In this way it seems to be a significant issue to measure the current, profile and also the position of the ion beam in a low-energy part of the accelerator. This work represents the results of experiments with the D-Pace WS-30 Wire Scanner Probe, which was installed in the low-energy part of the accelerator. The experiments were carried out under various conditions to vary the position and focusing control via the system of magnetic correcting elements. To correctly interpret experimental data it was necessary to take into account physical phenomena which occur during an experiment. In this way the effects which take place when the probe interacts with the beam were thoroughly considered. The obtained results allowed to restore the ion beam profile, define its size and position.
 
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THPSC070 Measurement of the Proton Beam Profile via an Activation Method of Diagnostics 698
 
  • E.O. Sokolova
    Budker INP & NSU, Novosibirsk, Russia
  • D.A. Kasatov, Ya.A. Kolesnikov, I.M. Shchudlo, S.Yu. Taskaev
    BINP SB RAS, Novosibirsk, Russia
 
  Funding: The study was supported by grants from the Russian Science Foundation (Project no. 14-32-00006) and the Budker Institute of Nuclear Physics and the Novosibirsk State University.
In The Budker Institute of Nuclear Physics the accelerator-based source of epithermal neutrons was invented and now operates to be used in the boron neutron capture therapy. Neutrons on the facility are generated during the threshold reaction 7Li(p, n)7Be which occurs when the proton beam is thrown on the lithium target. To control the neutron output it is necessary to monitor the parameters of the accelerated proton beam. The spatial distribution of the accelerated proton beam was measured exactly on the lithium target. Due to the interaction of protons and lithium there is an accumulation of a radioactive isotope of beryllium takes place. After experiments about neutrons generation it seems possible to track an area of beryllium storage and then restore the proton beam profile. The monitoring of gamma-quants with the energy of 0,477 MeV arising during the beryllium decay was carried out via the gamma-spectrometric complex. The main part of this complex is NaI-scintillation detector, which was pre-calibrated with energy. As a result of such kind of diagnostic the profile of the beam, its shape and characteristic size were determined and the results are depicted in this paper. Afterwards it could be used for an estimation of the total neutrons flux, its quantity, also to assess the target state and restore the proton beam profile.
 
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THPSC080 Data Processing Automatization for Gamma-Spectrometry Diagnostics of Neutron Accelerator BNCT 718
 
  • T.A. Bykov
    Budker INP & NSU, Novosibirsk, Russia
  • D.A. Kasatov
    BINP SB RAS, Novosibirsk, Russia
 
  Funding: The study was supported by the grants from the Russian Science Foundation (Project No.14-32-00006), Budker Nuclear Institute and Novosibirsk State University.
There is the accelerator-tandem at the Nuclear physics institute in Novosibirsk which is suitable for malignancies treatment such as glioblastoma and melanoma using BNCT methods. There are different gamma spectrometry diagnostics which apply under this project. One of these is used to determine the parameters of the neutron beam. The method is to irradiate a set of activation foils with neutrons. Then measure the gamma-spectrum of foils using gamma detector. Based on these data it can be calculated the activity of foil, as well as the amount and the energy of neutrons. For data processing of these diagnostics there was developed a software which is used for convenient display of gamma-spectrometer data and the activity of the foil. Software allows setting a canal calibration and the sensitivity calibration which is needed to calculate the foil activity.
 
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