CN111050457A - Device and method for improving neutron yield based on laser-induced plasma - Google Patents
Device and method for improving neutron yield based on laser-induced plasma Download PDFInfo
- Publication number
- CN111050457A CN111050457A CN201911376274.XA CN201911376274A CN111050457A CN 111050457 A CN111050457 A CN 111050457A CN 201911376274 A CN201911376274 A CN 201911376274A CN 111050457 A CN111050457 A CN 111050457A
- Authority
- CN
- China
- Prior art keywords
- laser
- plasma
- deuterium gas
- neutron
- deuterium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21G—CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES
- G21G4/00—Radioactive sources
- G21G4/02—Neutron sources
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H3/00—Production or acceleration of neutral particle beams, e.g. molecular or atomic beams
- H05H3/06—Generating neutron beams
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Plasma & Fusion (AREA)
- High Energy & Nuclear Physics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Particle Accelerators (AREA)
Abstract
A device and a method for improving neutron yield based on laser-induced plasma comprise a laser controller, a laser, an optical focusing system, a deuterium gas chamber, an accelerating tube, a tritium target and a neutron detector which are sequentially arranged along a neutron generating direction; the laser controller controls the laser, the laser outputs pulse laser, the diameter of the laser beam is reduced after the pulse laser passes through the optical focusing system, the focused laser is incident into a medium of a deuterium gas chamber, so that plasma is generated by deuterium gas, the deuterium gas plasma is accelerated in an accelerating tube and bombards a tritium target after acceleration, and the neutron detector is used for measuring the yield of neutrons. The invention can obviously improve the controllability and the plasma density in the deuterium plasma generating process, finally improve the yield of the seed source and eliminate the adverse effect brought by high-voltage electric pulses.
Description
Technical Field
The invention relates to the technical field of improving neutron yield, in particular to a device and a method for improving the neutron yield based on laser-induced plasma.
Background
A neutron source is a device that can release neutrons. According to the energy and neutron flux of neutrons, the method realizes research and application in the fields directly related to national economy and people's life, such as nuclear medicine and radiotherapy, nuclear logging and prospecting, fast neutron photography, medical isotope production, fast neutron activation analysis and the like, and drives the development of novel industrial technologies.
At present, in the scheme of generating high-energy neutrons by triggering deuterium-tritium fusion reaction by bombarding a tritium target piece through deuterium ion beams, deuterium ions are generated through high-voltage discharge, high voltage in the working process can reach ten thousand volts, the danger is extremely high, and extremely strong electromagnetic interference can be generated to influence the normal operation of circuits and other instruments. In addition, the density of the generated deuterium ions is low, so that the number of finally generated neutrons is small, the system efficiency is low, and the application of the neutron source technology is limited.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a device and a method for improving neutron yield based on laser-induced plasma, which significantly improve the controllability and plasma density in the deuterium plasma generation process, and finally improve the yield of seed sources, and simultaneously eliminate adverse effects caused by high-voltage electric pulses.
In order to achieve the purpose, the invention adopts the technical scheme that:
a device for improving neutron yield based on laser-induced plasma comprises a laser controller 1, a laser 2, an optical focusing system 3, a deuterium gas chamber 4, an accelerating tube 5, a tritium target 6 and a neutron detector 7 which are sequentially arranged along a neutron generating direction;
the laser controller 1 controls the laser 2, the laser 2 outputs pulse laser, the diameter of the laser beam is reduced after the pulse laser passes through the optical focusing system 3, the focused laser is incident into a medium of a deuterium gas chamber 4, so that deuterium gas generates plasma, the deuterium gas plasma is accelerated in an accelerating tube 5 and bombards a tritium target 6 after the acceleration, and a neutron detector 7 is used for measuring the yield of neutrons.
A method for improving neutron yield based on laser-induced plasma, comprising the steps of;
the method comprises the following steps: the control voltage signal output by the laser controller 1 modulates the laser 2, the laser 2 outputs a Q-switched giant pulse laser signal, and the laser controller 1 outputs a synchronous reference signal to control the neutron detector 7 for synchronously measuring the intensity of subsequently generated neutrons;
step two: laser output by the laser 2 is changed into a focused laser beam through the optical focusing system 3, and then the focused laser beam is transmitted and incident into the deuterium gas chamber 4 to generate deuterium gas plasma;
step three: the flight speed of the deuterium plasma generated in the deuterium gas chamber 4 is improved under the action of an electric field in the accelerating tube 5;
step four: the deuterium plasma after the action of the accelerating tube 5 is incident into the tritium target 6, the deuterium plasma and tritium generate fusion reaction, high-energy neutrons are further generated, and the neutron detector 7 is used for measuring the yield of the neutrons.
The repetition frequency and the width of a control voltage signal output by the laser controller 1 are adjustable, the repetition frequency is not lower than 1Hz, and the width is not lower than 200 mus.
The pulse laser output by the laser 2 is generated by Q-switching, and the energy of the pulse laser is adjustable and is not less than 100 mJ.
The optical focusing system 3 enables the laser beam output by the laser 2 to generate a focusing effect, the diameter of a focused light spot is adjustable, and the equivalent focal length of the optical focusing system 3 is not more than 500 mm.
The laser 2 is coaxial with the optical focusing system 3.
The deuterium gas in the deuterium gas chamber 4 can be in a gaseous state or a liquid state.
The electric field intensity in the accelerating tube 5 is not less than 1000V/m.
The tritium target 6 is a solid substance, and the thickness of the tritium target is not less than 10 mm.
The invention has the beneficial effects that:
in order to realize the high-efficiency neutron source technology, the invention adopts laser to induce the plasma by solving the defects of insufficient plasma yield, high-voltage discharge and the like in the process of generating the deuterium plasma by the high-voltage discharge at present. The method can obviously improve the controllability and the plasma density in the deuterium plasma generating process, finally improve the yield of the seed source and eliminate the adverse effect brought by high-voltage electric pulses.
The main process of laser-induced plasma, namely, the Q-switching technology is used to obtain laser with high repetition frequency and high peak power to replace the traditional high-voltage electric pulse, is that when the energy density of the laser is high enough, the laser interacts with a substance to ionize the substance, namely, the substance is broken down to form plasma. Compared with the traditional high-voltage discharge technology, the method has the following characteristics:
1) the working voltage is low (the working voltage of the laser is generally hundreds of volts), so the damage to human bodies is small and the electromagnetic interference is not obvious;
2) the plasma generation process is easy to control, the plasma intensity can be conveniently adjusted by adjusting the laser energy, and the generation of high-density and large-volume plasma can be realized by adopting high-energy laser;
3) compared with a discharge electrode, the direction of the laser beam is easy to adjust, namely, the plasma generated by the method has stronger direction controllability, which is convenient for practical application.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1: a device for improving neutron yield based on laser-induced plasma comprises a laser controller 1, a laser 2, an optical focusing system 3, a deuterium gas chamber 4, an accelerating tube 5, a tritium target 6 and a neutron detector 7 which are sequentially arranged along a neutron generating direction;
the laser controller 1 controls the laser 2, the laser 2 outputs pulse laser, the diameter of the laser beam is reduced after the pulse laser passes through the optical focusing system 3, the focused laser is incident into a medium of a deuterium gas chamber 4, so that deuterium gas generates plasma, the deuterium gas plasma is accelerated in an accelerating tube 5 and bombards a tritium target 6 after the acceleration, and a neutron detector 7 is used for measuring the yield of neutrons.
A method for improving neutron yield based on laser-induced plasma, comprising the steps of;
the method comprises the following steps: the control voltage signal output by the laser controller 1 modulates the laser 2, the laser 2 outputs a Q-switched giant pulse laser signal, and the laser controller 1 outputs a synchronous reference signal to control the neutron detector 7 for synchronously measuring the intensity of subsequently generated neutrons;
step two: laser output by the laser 2 is changed into a focused laser beam through the optical focusing system 3, and then the focused laser beam is transmitted and incident into the deuterium gas chamber 4 to generate deuterium gas plasma;
step three: the flight speed of the deuterium plasma generated in the deuterium gas chamber 4 is improved under the action of an electric field in the accelerating tube 5;
step four: the deuterium plasma after the action of the accelerating tube 5 is incident into the tritium target 6, the deuterium plasma and tritium generate fusion reaction, high-energy neutrons are further generated, and the neutron detector 7 is used for measuring the yield of the neutrons.
The repetition frequency and the width of a control voltage signal output by the laser controller 1 are adjustable, the repetition frequency is not lower than 1Hz, and the width is not lower than 200 mus.
The pulse laser output by the laser 2 is generated by Q-switching, and the energy of the pulse laser is adjustable and is not less than 100 mJ.
The optical focusing system 3 enables the laser beam output by the laser 2 to generate a focusing effect, the diameter of a focused light spot is adjustable, and the equivalent focal length of the optical focusing system 3 is not more than 500 mm.
The laser 2 is coaxial with the optical focusing system 3.
The deuterium gas in the deuterium gas chamber 4 can be in a gaseous state or a liquid state.
The electric field intensity in the accelerating tube 5 is not less than 1000V/m.
The tritium target 6 is a solid substance, and the thickness of the tritium target is not less than 10 mm.
Claims (9)
1. A device for improving neutron yield based on laser-induced plasma is characterized by comprising a laser controller (1), a laser (2), an optical focusing system (3), a deuterium gas chamber (4), an accelerating tube (5), a tritium target (6) and a neutron detector (7) which are sequentially arranged along a neutron generating direction;
the laser controller (1) controls the laser (2), the laser (2) outputs pulse laser, the diameter of the laser beam is reduced after the pulse laser passes through the optical focusing system (3), the focused laser is incident into a medium of a deuterium gas chamber (4), so that deuterium gas generates plasma, the deuterium gas plasma is accelerated in an accelerating tube (5), a tritium target (6) is bombarded after the acceleration, and a neutron detector (7) is used for measuring the yield of neutrons.
2. A method for improving neutron yield based on laser-induced plasma, comprising the steps of;
the method comprises the following steps: a control voltage signal output by the laser controller (1) modulates the laser (2), the laser (2) outputs a Q-switched giant pulse laser signal, and meanwhile, the laser controller (1) outputs a synchronous reference signal to control a neutron detector (7) for synchronously measuring the intensity of subsequently generated neutrons;
step two: laser output by the laser (2) is changed into a focused laser beam through the optical focusing system (3), and then the focused laser beam is transmitted and incident into the deuterium gas chamber (4) to generate deuterium gas plasma;
step three: the flight speed of the deuterium plasma generated in the deuterium gas chamber (4) is improved under the action of an electric field in the accelerating tube (5);
step four: the deuterium plasma acted by the accelerating tube (5) is incident into the tritium target (6), the deuterium plasma and tritium generate fusion reaction, high-energy neutrons are further generated, and the neutron detector (7) is used for measuring the yield of the neutrons.
3. The method for improving neutron yield based on laser-induced plasma according to claim 2, wherein the repetition frequency and the width of the control voltage signal output by the laser controller (1) are adjustable, the repetition frequency is not lower than 1Hz, and the width is not lower than 200 μ s.
4. The method for improving neutron yield based on laser-induced plasma as claimed in claim 2, wherein the pulsed laser output from the laser (2) is generated for Q-switching, and the energy thereof is adjustable and not less than 100 mJ.
5. The method for improving the neutron yield based on the laser-induced plasma as claimed in claim 2, wherein the optical focusing system (3) enables the laser beam output by the laser (2) to generate a focusing effect, the diameter of the focused laser spot is adjustable, and the equivalent focal length of the optical focusing system (3) is not more than 500 mm.
6. A method for improving neutron yield based on laser-induced plasma according to claim 2, characterized in that said laser (2) is coaxial to the optical focusing system (3).
7. The method for improving neutron yield based on laser-induced plasma as claimed in claim 2, wherein the deuterium gas in the deuterium gas chamber (4) can be in a gaseous state or a liquid state.
8. The method for improving neutron yield based on laser-induced plasma according to claim 2, characterized in that the electric field strength in the accelerating tube (5) is not less than 1000V/m.
9. The method for improving neutron yield based on laser-induced plasma according to claim 2, characterized in that the tritium target (6) is a solid substance with a thickness not less than 10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911376274.XA CN111050457A (en) | 2019-12-27 | 2019-12-27 | Device and method for improving neutron yield based on laser-induced plasma |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911376274.XA CN111050457A (en) | 2019-12-27 | 2019-12-27 | Device and method for improving neutron yield based on laser-induced plasma |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111050457A true CN111050457A (en) | 2020-04-21 |
Family
ID=70239162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911376274.XA Pending CN111050457A (en) | 2019-12-27 | 2019-12-27 | Device and method for improving neutron yield based on laser-induced plasma |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111050457A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965690A (en) * | 2020-08-03 | 2020-11-20 | 西京学院 | Method for detecting ion component ratio of target flow of neutron tube |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272656A (en) * | 2008-04-28 | 2008-09-24 | 西安石油大学 | High-temperature high-voltage miniature laser deuterium-deuterium atomic fusion neutron pipe |
| CN101507371A (en) * | 2006-07-28 | 2009-08-12 | 赛奇创新有限公司 | A method for generating a pulsed flux of energetic particles, and a particle source operating accordingly |
| CN102714062A (en) * | 2009-12-16 | 2012-10-03 | 浜松光子学株式会社 | Nuclear fusion target, nuclear fusion device, and nuclear fusion method |
| CN104918403A (en) * | 2015-06-26 | 2015-09-16 | 中国工程物理研究院核物理与化学研究所 | Pulsed neutron generator |
| CN105869693A (en) * | 2016-06-07 | 2016-08-17 | 中国工程物理研究院核物理与化学研究所 | Neutron source |
-
2019
- 2019-12-27 CN CN201911376274.XA patent/CN111050457A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101507371A (en) * | 2006-07-28 | 2009-08-12 | 赛奇创新有限公司 | A method for generating a pulsed flux of energetic particles, and a particle source operating accordingly |
| CN101272656A (en) * | 2008-04-28 | 2008-09-24 | 西安石油大学 | High-temperature high-voltage miniature laser deuterium-deuterium atomic fusion neutron pipe |
| CN102714062A (en) * | 2009-12-16 | 2012-10-03 | 浜松光子学株式会社 | Nuclear fusion target, nuclear fusion device, and nuclear fusion method |
| CN104918403A (en) * | 2015-06-26 | 2015-09-16 | 中国工程物理研究院核物理与化学研究所 | Pulsed neutron generator |
| CN105869693A (en) * | 2016-06-07 | 2016-08-17 | 中国工程物理研究院核物理与化学研究所 | Neutron source |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965690A (en) * | 2020-08-03 | 2020-11-20 | 西京学院 | Method for detecting ion component ratio of target flow of neutron tube |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Gahn et al. | Generating positrons with femtosecond-laser pulses | |
| Margarone et al. | Proton acceleration driven by a nanosecond laser from a cryogenic thin solid-hydrogen ribbon | |
| Pommarel et al. | Spectral and spatial shaping of a laser-produced ion beam for radiation-biology experiments | |
| CN214592103U (en) | Space environment simulation system based on laser wake field acceleration | |
| Fukuda et al. | Identification of high energy ions using backscattered particles in laser-driven ion acceleration with cluster-gas targets | |
| Busch et al. | Ion acceleration with ultrafast lasers | |
| Bolaños et al. | Highly-collimated, high-charge and broadband MeV electron beams produced by magnetizing solids irradiated by high-intensity lasers | |
| CN111050457A (en) | Device and method for improving neutron yield based on laser-induced plasma | |
| CN110887858B (en) | Ultrafast high-energy electron probe system based on ultrafast wide-spectrum electron beam | |
| Munemoto et al. | Direct injection of fully stripped carbon ions into a fast-cycling induction synchrotron and their capture by the barrier bucket | |
| Nürnberg | Laser-accelerated proton beams as a new particle source | |
| Sawada et al. | Development of 4.5 keV monochromatic X-ray radiography using the high-energy, picosecond LFEX laser | |
| Dietrich et al. | Beam–plasma interaction experiments with heavy-ion beams | |
| Mima et al. | Inertial fusion experiments and theory | |
| Liu et al. | Laser-Driven Collimated Neutron Sources Based on Kinematic Focusing | |
| Giulietti | The particle laser-plasma acceleration in Italy | |
| Krása et al. | Laser-Target Experiments at PALS for Deuterium Plasma Beam Fusion. | |
| RU2054717C1 (en) | Pulsed neutron generator | |
| SU814260A1 (en) | Pulsed neutron generator | |
| SU545227A1 (en) | Method of producing neutrons | |
| Fukuda et al. | Generation of 50-MeV/u He ions in laser-driven ion acceleration with cluster-gas targets | |
| Golubev et al. | New approach for a “point-like” neutron source creation based on sharp focusing of a high quality deuteron beam produced by high-current gasdynamic ECR ion source | |
| Hora et al. | Application of picosecond terawatt laser pulses for fast ignition of fusion | |
| RU2183389C1 (en) | Laser-plasma method for initiation of nuclear reactions | |
| CN113543447A (en) | Neutron beam generating device based on laser accelerator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200421 |
|
| RJ01 | Rejection of invention patent application after publication |