| Paper | Title | Page |
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| THPSC42 | Numerical Investigation of the Influence of the Magnetic Field in the Ion Source with the Penning Discharge of a Gas-Filled Neutron Tube on the Ion Current Pulse | 495 |
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Funding: The work was supported by the Ministry of Science and Education of the Russian Federation under the agreement No. 14.575.21.0169 (RFMEFI57517X0169). The report examines the influence of the distribution and intensity of a magnetic field in the ion source with the Penning discharge of a gas-filled neutron tube on the ion current pulse. The study was carried out by means of numerical modeling using the KARAT code*. The ion source has a length of 1.1 cm, the length of the anode is 0.6 cm with its diameter of 1.1 cm. Atomic deuterium is used at a pressure of 1 mTorr as the residual gas. A ring-shaped hot cathode with an electron current of 10 mA is considered as the discharge trigger. The anode voltage pulse has an amplitude of 2.5 kV and a front of 0.5 mks. The magnetic field is created by a 1.1 cm long solenoid with a diameter of 2.3 cm. The base case with respect to which the magnetic field ranged has an ion current pulse amplitude of 0.7 mA at a rise time of 2.5 mks. The displacement of the solenoid towards the cathode entails an increase in the ion current pulse amplitude up to 1 mA but at the same time it leads to its spreading. The transfer of the solenoid toward the anticathode shortens the front of the ion current pulse, but leads to a decrease in its amplitude to 0.4 mA. At the low magnetic field intensity the current pulse front becomes steeper, but the pulse itself has a more sinusoidal shape with an amplitude of 0.6 mA. An increase in the magnetic field intensity entails an increase in the duration of the pulse front and an increase in its amplitude up to 0.5 mA while retaining a pulse shape close to rectangular. *Tarakanov V.P. "User's Manual for Code KARAT", BRA Inc., Va, USA, 1992 |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-RUPAC2018-THPSC42 | |
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THPSC43 |
Generalized Results of Investigation of a Small-Sized Accelerating Ion Diode With Magnetic Insulation of Electrons for Neutron Generation | |
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Funding: This work was carried out under the Agreement No. 14.575.21.0169 (RFMEFI57517X0169) dated 26.09.2017 with the Ministry of science and education of the Russian Federation. Investigations of small-sized vacuum laser-plasma diodes have shown the possibility of effective acceleration of deuterons for the nuclear reaction D(d, n)3He in a diode with a laser deuterium-containing target at the anode and magnetic isolation of the electronic current component. Generalized results of investigations of the system of coaxial geometry of electrodes with an internal anode enclosed by a hollow cylindrical cathode are reported at various parameters: the radiation energy of a pulsed yttrium-aluminum garnet laser from 0.1 J to 1 J with a pulse duration of 10 ns and a wavelength of 1.06 mkm, accelerating voltage of a high voltage pulse source according to Arkadiev-Marx scheme from 300 kV to 450 kV. In addition, two methods for suppressing electronic conduction, a constant magnetic field with azimuthal symmetry, and a pulsed magnetic field of a spiral line adjacent to the cathode are considered. It has been experimentally established that the suppression of the electronic conductivity by the field of permanent magnets has a number of significant drawbacks. At a radiation energy of 0.85 J for a laser target, a current of the order of 1 kA with an accelerating voltage of the order of 400 kV was detected in a diode with magnetic insulation. An increase in the laser radiation energy from 0.1 to 0.85 J leads to an increase in the total number of deuterons produced in a laser plasma to about 1015. |
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THPSC44 |
Experimental Studies of Neutron Generation by the Laser Plasma Acceleration Method in a Nonstationary Magnetic Field | |
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Funding: This work was carried out under the Agreement No. 14.575.21.0169 (RFMEFI57517X0169) dated 26.09.2017 with the Ministry of science and education of the Russian Federation. The experimental results of deuteron acceleration based on the expansion of a quasineutral laser plasma in a strong nonstationary magnetic field for the generation of neutrons are discussed, which became a logical continuation of a series of previous works. To obtain a laser plasma, an Nd: YAG laser (wavelength 1.06 nm) was used with the impulse power of 0.85 J and duration of 10 nsec. During its radiation focusing at a dielectric target made of deuterated polyethylene (CD2)n in a vacuum of ~ 10-4 torr, the power density of about 5×1015 W×m-2 was reached. A rapidly growing magnetic field was created when the voltage generator was discharged, based on the pulse charging of the storage capacitance from the high-voltage pulse transformer. When the voltage 100 kV is reached, a breakdown of the spark gap and a discharge of the capacitance onto the induction coil generating a magnetic field (maximum current of the order of 10 kA) occurs. The ion speed was determined as per the time-of-flight method with the registration of ion current at a collector made as a Faraday cylinder, which is installed at a distance of 0.5 m from the laser target. The rapidly increasing magnetic field reached 108 T/s, the maximum ion flow rate was 3×108 cm/s. When a beam of accelerated deuterons was directed to a closely spaced deuterium-containing target, an output of 104 neutrons/pulse was reached. |
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