Pulsed neutron generators based on the sealed chambers of plasma focus design with D and DT fillings

Yurkov, D. I.; Дулатов, А. К.; Lemeshko, B. D.; Golikov, A V; Andreev, Dmitrii; Mikhailov, Yu. V.; Прокуратов, И. А.; Selifanov, A. N.

doi:10.1088/1742-6596/653/1/012019

Cited by 11 publications

(3 citation statements)

References 1 publication

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“…The principle of prompt fission neutron uranium logging is shown in figure 1. Using a pulsed neutron source, such as a deuterium-tritium (D-T) or deuterium-deuterium (D-D) pulsed neutron source, emits the large number of source neutrons (with an energy of about 14 MeV) into the formation rock around the logging well within 10-20 μs [12]. After that, the source neutrons are slowed down to epithermal neutrons (energy of about 0.7 eV to 1.0 keV) by the stratigraphic material.…”

Section: Principle Of Uranium Quantification By Prompt Fission Neutro...mentioning

confidence: 99%

Experimental Study of the influence of PVC casing thickness and well fluid density on prompt fission neutron uranium logging and its corrections

Zhou,

Tang

2023

J. Inst.

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Prompt fission neutron uranium logging is a direct method for measuring uranium content.This method is not influenced by uranium-radium disequilibrium, and provides an accurate and direct way to obtain the uranium content of the formation. However, in field logging, the results of logging are susceptible to the influence of lithology, well fluid and casing. Thus, it must be corrected. Based on the“epithermal /thermal neutron counting rate ratio”(i.e., NE/T ) theory of uranium quantification, a uranium block model is built to simulate field production boreholes. Meanwhile, the influences of PVC casing thickness, well fluid composition and well fluid density on the decay rate of epithermal neutrons and thermal neutrons and the error correction method are investigated. The experimental results show that NE/T increases linearly with increasing thickness of the PVC casing, and the correction equation is μ PVC = -0.0501 dPVC + 1, with a goodness of fit R 2 = 0.9931. The effect of different well fluid compositions and densities on the decay rate of double neutrons is kaolinite ≥ montmorillonite < chlorite < illite. μ_mud follows a quadratic decay law with increasing well fluid density and the fit R 2 < 0.95. Finally, theaverage corrected uranium quantification error is within 5% of the actual uranium content.

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Section: Principle Of Uranium Quantification By Prompt Fission Neutro...mentioning

confidence: 99%

Experimental Study of the influence of PVC casing thickness and well fluid density on prompt fission neutron uranium logging and its corrections

Zhou,

Tang

2023

J. Inst.

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“…• This set-up can be supplied with a sealed chamber having a D-T gas mixture generator with a heater discharging the gas into the chamber's volume [13].…”

Section: Pf-6 Devicementioning

confidence: 99%

Taxonomy of Big Nuclear Fusion Chambers Provided by Means of Nanosecond Neutron Pulses

Грибков¹,

Bienkowska²,

Jednoróg³

et al. 2020

Fusion Energy

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A methodology is elaborated and applied to taxonomy of large chambers of thermonuclear fusion reactors. It ensures a feasibility to describe impairments produced by environment and details of the chamber into the neutron field generated during the operation of a reactor. The method is based on application of very bright nanosecond neutron flashes irradiated from a compact neutron source of a dense plasma focus type. A number of neutron activation procedures as well as a neutron time-of-flight method were applied to trace deviations of neutron 3-D fields after their interaction with the simulator of the above chamber. Monte-Carlo modeling of these processes gained the data on the most important elements that influenced on the fields.

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“…Sealed neutron tubes are widely used in neutron logging, neutron radiography, the cargo security system of ports, airports, and stations due to the advantages of safety, miniaturization, portability, good tightness [1][2][3], etc. For the sake of improving the nuclear reaction efficiency and reducing the size of neutron tubes, several methods were adopted, for example, the secondary electrons suppression [4], the deuterium or tritium absorption capabilities enhancement [5], and vacuum stability promotion [6].…”

Section: Introductionmentioning

confidence: 99%

Laser Processed Oxygen-Free High-Conductivity Copper with Ti and Ti–Zr–V–Hf Films Applied in Neutron Tube

et al. 2019

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The laser processing method has proven to produce surfaces while ensuring a low secondary electron yield of oxygen-free high-conductivity copper (OFHC) samples, making it attractive for electron cloud mitigation in next-generation particle accelerators and neutron tubes. In this work, the laser processing method is proposed to OFHC targets for the first time, aiming to reduce the secondary electrons in the neutron tube. The secondary electron yields (SEYs) and the thermal conductivities of Ti film and quaternary Ti–Zr–V–Hf films with unprocessed and laser processed OFHC substrates are investigated. Our results highlight that the thermal conductivity of Ti film with laser processed OFHC substrates is in proximity to the cleaned bare OFHC sample, especially at high temperatures. Moreover, the SEY of coated OFHC substrates are higher than that of coated laser processed substrates, which indicates the better secondary electron suppression capability of coated laser processed substrates. Therefore, the thermal conductivity and SEY results illustrate that the application of Ti and Ti–Zr–V–Hf coated laser processed OFHC can be considered to improve the neutron yield in neutron tubes in the future.

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Pulsed neutron generators based on the sealed chambers of plasma focus design with D and DT fillings

Cited by 11 publications

References 1 publication

Experimental Study of the influence of PVC casing thickness and well fluid density on prompt fission neutron uranium logging and its corrections

Experimental Study of the influence of PVC casing thickness and well fluid density on prompt fission neutron uranium logging and its corrections

Taxonomy of Big Nuclear Fusion Chambers Provided by Means of Nanosecond Neutron Pulses

Laser Processed Oxygen-Free High-Conductivity Copper with Ti and Ti–Zr–V–Hf Films Applied in Neutron Tube

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