RuPAC2014 - List of Authors (Makarov, A.N.)

Paper

Title

Page

Measurement of the Dose Rate and the Radiation Spectrum of the Interaction of 2 MeV Proton Beam with a Variety of Structural Materials

113

D.A. Kasatov, A.N. Makarov, I.M. Shchudlo, S.Yu. Taskaev
BINP SB RAS, Novosibirsk, Russia

The paper presents the results of measurements of the spectrum and the radiation dose during irradiation of different construction materials with 2 MeV proton beam. There are shown the spectra of the induced activity of a number of materials and signals from the neutron detector. Based on the obtained results it is made the optimal choice of the target material, on which it is deposited a thin layer of lithium to generate epithermal neutrons used for boron neutron capture therapy of malignant tumors. Recommendations are given for materials desirable to use inside the high-energy beam transporting channel to reduce the dose of concomitant radiation.

TUPSA37

Measurement of the Spatial Distribution of Gamma Radiation at Tandem Accelerator with Vacuum Insulation

116

I.M. Shchudlo, D.A. Kasatov, A.N. Makarov, S.Yu. Taskaev
BINP SB RAS, Novosibirsk, Russia

In BINP the source of epithermal neutrons for BNCT based on the tandem accelerator with vacuum insulation and a lithium target was created and operates. The paper presents the study of the spatial distribution of the X-ray emission produced by the interaction of accelerated electrons with the materials of construction of the accelerator.

WEPSB16

Studying of the Accompanying Charged Particles in the Tandem Accelerator with Vacuum Insulation

189

A.N. Makarov, D.A. Kasatov, I.M. Shchudlo, S.Yu. Taskaev
BINP SB RAS, Novosibirsk, Russia

On the tandem accelerator with vacuum insulation in a steady long mode it was obtained 1.6 mA current of protons with 2 MeV energy. It was studied the one of the possible reasons of current limitation – the appearance of accompanying charged particles during acceleration of the ion beam. The paper presents and discusses the results of the accompanying beam measurement using a special detector. The detector registered an opposite positive current in the range of 80-170 mkA, which is directly dependent on vacuum conditions in the accelerator. Also it was measured the dependence of the dose rate on the total current in the accelerating gap. These measurements confirmed that injected H⁻ beam ionizes residual and stripping gas mainly in the area before the first electrode and two proposals were made to minimize the accompanying current.

WEPSB18

Modification of the Argon Stripping Target of the Tandem Accelerator

194

Y.M. Ostreinov, A.N. Makarov, S.Yu. Taskaev, P. Vobly
BINP SB RAS, Novosibirsk, Russia

The paper presents and discusses the project of modified gas stripping target. The idea of the target modification is the following. Inside the high-voltage electrode just behind inlet aperture it is proposed to apply 1 T transverse magnetic field using a two-pole permanent magnets. Similar magnets at the exit of the stripping target return proton beam back to the axis of accelerator channel. In this geometry not only significant suppression of ion penetration of the stripping gas into the accelerating channel can be achieved, but also a significant improvement of vacuum conditions in the accelerating channel and reduction of the ultraviolet radiation from the plasma in the stripping target. It is enough to shift the stripping target to a distance greater than the aperture (20 mm) in the high-voltage electrode and to implement a differential gas pumping. The paper presents results of trajectory calculation of the injected ion beam in Comsol Multiphysics. The geometry of the magnetic system and the system of differential gas pumping using turbomolecular pump installed inside the high-voltage electrode are presented.

FRCB01

Problems and Prospects of the Tandem Accelerator with Vacuum Insulation

465

S.Yu. Taskaev, D.A. Kasatov, A.S. Kuznetsov, A.N. Makarov, I.M. Shchudlo, I.N. Sorokin
BINP SB RAS, Novosibirsk, Russia

Funding: Ministry of Education and Science of Russia (project RFMEFI57614X0181)
At BINP for development of boron neutron capture therapy it is proposed and constructed the tandem accelerator with vacuum insulation, which is characterized by rapid acceleration of charged particles. Problems of high-voltage strength gaps due to the large stored energy and strong electrostatic lens are solved. It is obtained a stationary 1.6 mA 2 MeV proton beam having 0.1% energy monochromaticity and 0.5% current stability. It is clarified, that further increase of the proton current in the stable mode without breakdowns is limited by the accompanying current in the high-voltage gaps. It is proposed to make vacuum conditions better in the input of the accelerator using additional cryopump, to modernize argon stripping target by its tilting or shifting and to use differential pumping inside the high-voltage electrode. Obtaining of the 3 mA 2.5 MeV proton beam will allow us to conduct boron neutron capture therapy.

Slides FRCB01 [0.815 MB]

Paper	Title	Page
TUPSA36	Measurement of the Dose Rate and the Radiation Spectrum of the Interaction of 2 MeV Proton Beam with a Variety of Structural Materials	113
	D.A. Kasatov, A.N. Makarov, I.M. Shchudlo, S.Yu. Taskaev BINP SB RAS, Novosibirsk, Russia
	The paper presents the results of measurements of the spectrum and the radiation dose during irradiation of different construction materials with 2 MeV proton beam. There are shown the spectra of the induced activity of a number of materials and signals from the neutron detector. Based on the obtained results it is made the optimal choice of the target material, on which it is deposited a thin layer of lithium to generate epithermal neutrons used for boron neutron capture therapy of malignant tumors. Recommendations are given for materials desirable to use inside the high-energy beam transporting channel to reduce the dose of concomitant radiation.

TUPSA37	Measurement of the Spatial Distribution of Gamma Radiation at Tandem Accelerator with Vacuum Insulation	116
	I.M. Shchudlo, D.A. Kasatov, A.N. Makarov, S.Yu. Taskaev BINP SB RAS, Novosibirsk, Russia
	In BINP the source of epithermal neutrons for BNCT based on the tandem accelerator with vacuum insulation and a lithium target was created and operates. The paper presents the study of the spatial distribution of the X-ray emission produced by the interaction of accelerated electrons with the materials of construction of the accelerator.

WEPSB16	Studying of the Accompanying Charged Particles in the Tandem Accelerator with Vacuum Insulation	189
	A.N. Makarov, D.A. Kasatov, I.M. Shchudlo, S.Yu. Taskaev BINP SB RAS, Novosibirsk, Russia
	On the tandem accelerator with vacuum insulation in a steady long mode it was obtained 1.6 mA current of protons with 2 MeV energy. It was studied the one of the possible reasons of current limitation – the appearance of accompanying charged particles during acceleration of the ion beam. The paper presents and discusses the results of the accompanying beam measurement using a special detector. The detector registered an opposite positive current in the range of 80-170 mkA, which is directly dependent on vacuum conditions in the accelerator. Also it was measured the dependence of the dose rate on the total current in the accelerating gap. These measurements confirmed that injected H⁻ beam ionizes residual and stripping gas mainly in the area before the first electrode and two proposals were made to minimize the accompanying current.

WEPSB18	Modification of the Argon Stripping Target of the Tandem Accelerator	194
	Y.M. Ostreinov, A.N. Makarov, S.Yu. Taskaev, P. Vobly BINP SB RAS, Novosibirsk, Russia
	The paper presents and discusses the project of modified gas stripping target. The idea of the target modification is the following. Inside the high-voltage electrode just behind inlet aperture it is proposed to apply 1 T transverse magnetic field using a two-pole permanent magnets. Similar magnets at the exit of the stripping target return proton beam back to the axis of accelerator channel. In this geometry not only significant suppression of ion penetration of the stripping gas into the accelerating channel can be achieved, but also a significant improvement of vacuum conditions in the accelerating channel and reduction of the ultraviolet radiation from the plasma in the stripping target. It is enough to shift the stripping target to a distance greater than the aperture (20 mm) in the high-voltage electrode and to implement a differential gas pumping. The paper presents results of trajectory calculation of the injected ion beam in Comsol Multiphysics. The geometry of the magnetic system and the system of differential gas pumping using turbomolecular pump installed inside the high-voltage electrode are presented.

FRCB01	Problems and Prospects of the Tandem Accelerator with Vacuum Insulation	465
	S.Yu. Taskaev, D.A. Kasatov, A.S. Kuznetsov, A.N. Makarov, I.M. Shchudlo, I.N. Sorokin BINP SB RAS, Novosibirsk, Russia
	Funding: Ministry of Education and Science of Russia (project RFMEFI57614X0181) At BINP for development of boron neutron capture therapy it is proposed and constructed the tandem accelerator with vacuum insulation, which is characterized by rapid acceleration of charged particles. Problems of high-voltage strength gaps due to the large stored energy and strong electrostatic lens are solved. It is obtained a stationary 1.6 mA 2 MeV proton beam having 0.1% energy monochromaticity and 0.5% current stability. It is clarified, that further increase of the proton current in the stable mode without breakdowns is limited by the accompanying current in the high-voltage gaps. It is proposed to make vacuum conditions better in the input of the accelerator using additional cryopump, to modernize argon stripping target by its tilting or shifting and to use differential pumping inside the high-voltage electrode. Obtaining of the 3 mA 2.5 MeV proton beam will allow us to conduct boron neutron capture therapy.
	Slides FRCB01 [0.815 MB]