RUPAC2012 - List of Authors (Kuznetsov, A.S.)

Paper

Title

Page

VITA Based Neutron Source - Status and Prospects

230

S.Yu. Taskaev, V.I. Aleynik, A.G. Bashkirtsev, B.F. Bayanov, M.V. Kamkin, D.A. Kasatov, A.S. Kuznetsov, A.N. Makarov, I.M. Schudlo, I.N. Sorokin, M.A. Tiunov
BINP SB RAS, Novosibirsk, Russia

Funding: Ministry of Education and Science of Russian Federation (grant 16.518.11.7038)
At the BINP, a pilot epithermal neutron source is now in use. It is based on a compact Vacuum Insulation Tandem Accelerator and uses neutron generation from the reaction 7Li(p,n)7Be. Generation of neutrons was established and in vitro experiments were held. Most recent investigations on the facility are related with: i) studying the dark currents and breakdowns, ii) analyzing and suppressing the high intensity dark currents, iii) measuring the intensity and the spectra of the X-ray radiation, iv) optimization of the H-beam injection into the accelerator, v) placing and calibrating the new gas stripping target. The results of these studies are discussed in the present work. Investigations resulted in increasing of mean current of the proton beam in stable mode (from 0.1 – 0.7 to 1.5 - 2 mA). In the nearest future new experiments are planned, including in vitro tests, blistering investigation, spectrum and flux measuring for neutrons and gamma, calculating the dose absorbed by phantom. Different ways of providing additional stability to the accelerator, of increasing the current of the proton beam are discussed in this work, as well as the ways of creating the therapeutic beam and strategies of applying the facility for clinical use.

Slides FRBCH04 [2.526 MB]

MOPPA030

X-ray Radiation High-Voltage Elements of the Tandem Accelerator With Vacuum Insulation

299

I.N. Sorokin, A.G. Bashkirtsev, V.Ya. Chudaev, A.A. Ivanov, D.A. Kasatov, A.S. Kuznetsov, S.Yu. Taskaev
BINP SB RAS, Novosibirsk, Russia

In Institute of Nuclear Physics SB RAS the epithermal neutron source is entered into operation based on the tandem – accelerator with vacuum isolation. It was evaluated the accelerating installation components of a X-ray field causing dark current and breakdowns in accelerating gaps. The estimated account of equivalent doze capacity on different distances from the accelerator in the protected hall and behind its limits is made. The experimental measurements were carried out and the study results of the doze capacity dynamics are submitted, depending on change of a dark current in tandem accelerating gaps at a complete working voltage 1 MV without a beam. The spectrum of X-ray radiation is experimentally measured. It is experimentally revealed and the occurrence of powerful X-ray radiation is investigated at substantial growth of the aperture of the accelerating channel. Are offered and the changes of a design of installation for prevention of occurrence of powerful X-ray radiation are realized. The carried out research allows setting necessary parameters for designing medical installation on the basis of an accelerator - tandem with vacuum isolation with the purpose of realization in oncological clinics neutron-capture therapy of malignant tumours.

WEPPC057

Calibration Testing of the Stripping Target of the Vacuum Insulated Tandem Accelerator

560

A.S. Kuznetsov, V.I. Aleynik, I.M. Shchudlo, I.N. Sorokin, S.Yu. Taskaev, M.A. Tiunov
BINP SB RAS, Novosibirsk, Russia

Funding: The work supported by the Ministry of Education and Science of the Russian Federation.
The Vacuum Insulated Tandem Accelerator was developed in the Budker Institute of Nuclear Physics to produce epithermal neutrons for boron neutron capture therapy in the 7Li(p,g)7Be reaction. The parameters of the generated radiation allow us to carry out in vitro and in vivo investigations of BNCT*. In present moment the modernization of the facility elements is carrying out to meet the parameters required for clinical usage. Presented work is aimed on modernization of the gas stripping target that is used in the Vacuum Insulated Tandem Accelerator to recharge negative hydrogen ions into protons. The target was modernized to get higher efficiency of the beam transportation and to raise the current of the accelerated proton beam. The design of the modernized stripping target, the calculated data on gas flow rate and recharge effectiveness, also the results of experimental measurement of transported current depending on the gas flow rate are presented. The method of the target thickness determination and the procedure to adjust the regime of gas flow gate to get the required recharging effect were suggested.
* V. Aleynik, A. Burdakov, V. Davydenko, et al. BINP accelerator based epithermal neutron source. Applied Radiation and Isotopes, 69 (2011) 1635-1638.

WEPPD038

Optimization of the Negative Hydrogen Ion Beam Injection into the Tandem Accelerator with Vacuum Insulation

623

A.N. Makarov, V.I. Aleynik, A.G. Bashkirtsev, A.S. Kuznetsov, I.M. Schudlo, I.N. Sorokin, S.Yu. Taskaev, M.A. Tiunov
BINP SB RAS, Novosibirsk, Russia

The beam of negative hydrogen ions is injected into the tandem accelerator with vacuum insulation in order to obtain high-current proton beam. To accurately direct the beam into the accelerator the magnetic focusing lenses are used. In this paper it is described the design of the special beam detector mounted in front of the first accelerating electrode and intended to measure beam profile and the current density. The results of measurements of the dependence of the current density on the power of the magnetic focusing lenses are shown. The parameters of the beam resulting in the best agreement of calculation and experiment are specified. The optimum focusing mode to inject the negative hydrogen ions into the accelerator is determined.

Paper	Title	Page
FRBCH04	VITA Based Neutron Source - Status and Prospects	230
	S.Yu. Taskaev, V.I. Aleynik, A.G. Bashkirtsev, B.F. Bayanov, M.V. Kamkin, D.A. Kasatov, A.S. Kuznetsov, A.N. Makarov, I.M. Schudlo, I.N. Sorokin, M.A. Tiunov BINP SB RAS, Novosibirsk, Russia
	Funding: Ministry of Education and Science of Russian Federation (grant 16.518.11.7038) At the BINP, a pilot epithermal neutron source is now in use. It is based on a compact Vacuum Insulation Tandem Accelerator and uses neutron generation from the reaction 7Li(p,n)7Be. Generation of neutrons was established and in vitro experiments were held. Most recent investigations on the facility are related with: i) studying the dark currents and breakdowns, ii) analyzing and suppressing the high intensity dark currents, iii) measuring the intensity and the spectra of the X-ray radiation, iv) optimization of the H-beam injection into the accelerator, v) placing and calibrating the new gas stripping target. The results of these studies are discussed in the present work. Investigations resulted in increasing of mean current of the proton beam in stable mode (from 0.1 – 0.7 to 1.5 - 2 mA). In the nearest future new experiments are planned, including in vitro tests, blistering investigation, spectrum and flux measuring for neutrons and gamma, calculating the dose absorbed by phantom. Different ways of providing additional stability to the accelerator, of increasing the current of the proton beam are discussed in this work, as well as the ways of creating the therapeutic beam and strategies of applying the facility for clinical use.
	Slides FRBCH04 [2.526 MB]

MOPPA030	X-ray Radiation High-Voltage Elements of the Tandem Accelerator With Vacuum Insulation	299
	I.N. Sorokin, A.G. Bashkirtsev, V.Ya. Chudaev, A.A. Ivanov, D.A. Kasatov, A.S. Kuznetsov, S.Yu. Taskaev BINP SB RAS, Novosibirsk, Russia
	In Institute of Nuclear Physics SB RAS the epithermal neutron source is entered into operation based on the tandem – accelerator with vacuum isolation. It was evaluated the accelerating installation components of a X-ray field causing dark current and breakdowns in accelerating gaps. The estimated account of equivalent doze capacity on different distances from the accelerator in the protected hall and behind its limits is made. The experimental measurements were carried out and the study results of the doze capacity dynamics are submitted, depending on change of a dark current in tandem accelerating gaps at a complete working voltage 1 MV without a beam. The spectrum of X-ray radiation is experimentally measured. It is experimentally revealed and the occurrence of powerful X-ray radiation is investigated at substantial growth of the aperture of the accelerating channel. Are offered and the changes of a design of installation for prevention of occurrence of powerful X-ray radiation are realized. The carried out research allows setting necessary parameters for designing medical installation on the basis of an accelerator - tandem with vacuum isolation with the purpose of realization in oncological clinics neutron-capture therapy of malignant tumours.

WEPPC057	Calibration Testing of the Stripping Target of the Vacuum Insulated Tandem Accelerator	560
	A.S. Kuznetsov, V.I. Aleynik, I.M. Shchudlo, I.N. Sorokin, S.Yu. Taskaev, M.A. Tiunov BINP SB RAS, Novosibirsk, Russia
	Funding: The work supported by the Ministry of Education and Science of the Russian Federation. The Vacuum Insulated Tandem Accelerator was developed in the Budker Institute of Nuclear Physics to produce epithermal neutrons for boron neutron capture therapy in the 7Li(p,g)7Be reaction. The parameters of the generated radiation allow us to carry out in vitro and in vivo investigations of BNCT. In present moment the modernization of the facility elements is carrying out to meet the parameters required for clinical usage. Presented work is aimed on modernization of the gas stripping target that is used in the Vacuum Insulated Tandem Accelerator to recharge negative hydrogen ions into protons. The target was modernized to get higher efficiency of the beam transportation and to raise the current of the accelerated proton beam. The design of the modernized stripping target, the calculated data on gas flow rate and recharge effectiveness, also the results of experimental measurement of transported current depending on the gas flow rate are presented. The method of the target thickness determination and the procedure to adjust the regime of gas flow gate to get the required recharging effect were suggested. V. Aleynik, A. Burdakov, V. Davydenko, et al. BINP accelerator based epithermal neutron source. Applied Radiation and Isotopes, 69 (2011) 1635-1638.

WEPPD038	Optimization of the Negative Hydrogen Ion Beam Injection into the Tandem Accelerator with Vacuum Insulation	623
	A.N. Makarov, V.I. Aleynik, A.G. Bashkirtsev, A.S. Kuznetsov, I.M. Schudlo, I.N. Sorokin, S.Yu. Taskaev, M.A. Tiunov BINP SB RAS, Novosibirsk, Russia
	The beam of negative hydrogen ions is injected into the tandem accelerator with vacuum insulation in order to obtain high-current proton beam. To accurately direct the beam into the accelerator the magnetic focusing lenses are used. In this paper it is described the design of the special beam detector mounted in front of the first accelerating electrode and intended to measure beam profile and the current density. The results of measurements of the dependence of the current density on the power of the magnetic focusing lenses are shown. The parameters of the beam resulting in the best agreement of calculation and experiment are specified. The optimum focusing mode to inject the negative hydrogen ions into the accelerator is determined.