CN116990855A - On-line electronic magnetic spectrometer - Google Patents
On-line electronic magnetic spectrometer Download PDFInfo
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- CN116990855A CN116990855A CN202311264020.5A CN202311264020A CN116990855A CN 116990855 A CN116990855 A CN 116990855A CN 202311264020 A CN202311264020 A CN 202311264020A CN 116990855 A CN116990855 A CN 116990855A
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- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
- G01T1/362—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry with scintillation detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
Abstract
The invention discloses an online electronic magnetic spectrometer, which relates to the technical field of plasma physics and nuclear detection and comprises an assembly shielding box, a magnet assembly and an image transmission detector, wherein the magnet assembly and the image transmission detector are arranged in the assembly shielding box; the magnet assembly is used for realizing beam limiting and deflection of the electron beam, so that separation of electron spaces with different energies is realized; the image sensor comprises an assembly box, a scintillator, an optical fiber panel and a CMOS sensor, wherein the scintillator, the optical fiber panel and the CMOS sensor are all installed on the assembly box, the scintillator is connected with the CMOS sensor through the optical fiber panel, an electron beam can be incident on the scintillator after passing through the magnet assembly, and scintillation light is generated and can be transmitted to the CMOS sensor through the optical fiber panel. The invention can realize effective protection of the CMOS sensor chip and avoid the deterioration of the performance of the CMOS sensor.
Description
Technical Field
The invention relates to the technical field of plasma physics and nuclear detection, in particular to an online electronic magnetic spectrometer.
Background
In the physical research of interaction of ultra-strong laser plasmas, the research of energy conversion efficiency from laser to electrons is the basis of various researches; among these, diagnosis of the electron spectrum is a very necessary and fundamental task. The current internationally-used electronic energy spectrum diagnosis equipment is an electronic magnetic spectrometer based on a diode magnet, most of the cases are the recording medium is an imaging plate, and after the experiment is finished, the electronic energy spectrum information can be acquired by carrying out scanning post-treatment on the recording medium; along with the development of the ultra-strong laser technology of the frequency of gravity, the rapid and timely electronic energy spectrum data needs to be provided.
In recent years, an on-line diagnosis method has been developed, in which an electronic signal is converted into a visible light signal by a scintillator and then transmitted to a visible light CCD (Charge Coupled Device ) through a lens or an optical fiber for recording; however, the recording structure is relatively complex and occupies a large space.
In addition, researchers have proposed a diagnosis concept of directly connecting a CMOS (Complementary Metal Oxide Semiconductor ) sensor to a scintillator, and there is a risk that the CMOS sensor will deteriorate when used for a long period of time, although the structure is relatively simple.
Therefore, it is needed to provide a new online electron spectrometer to solve the above problem of poor performance of the CMOS sensor.
Disclosure of Invention
The invention aims to provide an online electronic magnetic spectrometer so as to solve the problems in the prior art, and can realize effective protection of a CMOS sensor chip and avoid performance deterioration of the CMOS sensor.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides an online electronic magnetic spectrometer, which comprises an assembly shielding box, a magnet assembly and an image transmission detector, wherein the magnet assembly and the image transmission detector are arranged in the assembly shielding box; the magnet assembly is used for realizing beam limiting and deflection of the electron beam, so that separation of electron spaces with different energies is realized; the image sensor comprises an assembly box, a scintillator, an optical fiber panel and a CMOS sensor, wherein the scintillator, the optical fiber panel and the CMOS sensor are all installed on the assembly box, the scintillator is connected with the CMOS sensor through the optical fiber panel, an electron beam can be incident on the scintillator after passing through the magnet assembly, and scintillation light is generated and can be transmitted to the CMOS sensor through the optical fiber panel.
Preferably, the scintillator is a strip-shaped scintillator sheet, the optical fiber panel is a right-angle trapezoid plate, the length of the optical fiber panel is the same as that of the scintillator sheet, the inclined plane is tightly attached to the rear surface of the scintillator sheet, a right-angle surface opposite to the inclined plane is tightly attached to the front surface of the CMOS sensor, and the CMOS sensor is of a strip-shaped structure and has the same length as that of the scintillator sheet;
the scintillator thin film is characterized in that a metal thin film is further paved on one surface of the scintillator thin film, which is opposite to the optical fiber panel, and the metal thin film is of a strip-shaped structure, and the length and the width of the metal thin film are both larger than those of the scintillator thin film.
Preferably, the assembly box is further provided with a cable port, the cable port is used for allowing a data line and a power line to pass through, and the data line and the power line are connected with the CMOS sensor.
Preferably, the magnet assembly includes a wedge magnet and a yoke assembly; the wedge magnets are arranged in parallel, a gap is reserved between the two wedge magnets, and the magnetic field direction of the wedge magnets is perpendicular to the magnet faces of the two wedge magnets which are oppositely arranged; the yoke assembly surrounds the wedge-shaped magnet, a front through hole is formed in the front end of the yoke assembly, a rear through hole is formed in the rear end of the yoke assembly, the front through hole and the rear through hole are coaxially arranged, the front through hole is used for introducing an electron beam and limiting the width of the electron beam, and the electron beam can enter gaps of the two wedge-shaped magnets and is incident on the scintillator.
Preferably, each wedge-shaped magnet comprises a front right-angle side, a rear right-angle side, an upper right-angle side, a lower right-angle side and a bevel side, wherein two ends of the rear right-angle side are respectively and vertically connected with the rear end of the upper right-angle side and the rear end of the lower right-angle side, one end of the front right-angle side is vertically connected with the front end of the lower right-angle side, and the other end of the front right-angle side is connected with the front end of the upper right-angle side through the bevel side; the length of the upper right-angle side is smaller than that of the lower right-angle side, the length of the front right-angle side is smaller than that of the rear right-angle side, and the bevel edge is arranged close to the front through hole.
Preferably, the yoke assembly comprises a front yoke, a rear yoke, a bottom yoke and side yokes, wherein the side yokes are provided with two pieces, the front ends of the two pieces of side yokes are respectively connected with two sides of the front yoke, the rear ends of the two pieces of side yokes are respectively connected with two sides of the rear yoke, and the bottom yoke is connected between the bottoms of the front yoke, the rear yoke and the two pieces of side yokes; the inner walls of the two side yokes are respectively attached to the side surfaces of the two wedge-shaped magnets, the front yoke is parallel to the front right-angle side of the wedge-shaped magnets and has a distance, the rear yoke is parallel to the rear right-angle side of the wedge-shaped magnets and has a distance, and the bottom yoke is parallel to the lower right-angle side of the wedge-shaped magnets and has a distance;
the front yoke is provided with the front through hole, the rear yoke is provided with the rear through hole, and the front through hole is positioned at the center of the front yoke and is used for introducing electron beams and limiting the width of the electron beams.
Preferably, a charged particle shielding plate is arranged between the front right-angle side of the wedge-shaped magnet and the front yoke, between the rear right-angle side of the wedge-shaped magnet and the rear yoke, and between the lower right-angle side of the wedge-shaped magnet and the bottom yoke; the front shielding plate through holes corresponding to the front through holes are formed in the charged particle shielding plates between the wedge-shaped magnets and the front yokes, and the rear shielding plate through holes corresponding to the rear through holes are formed in the charged particle shielding plates between the wedge-shaped magnets and the rear yokes.
Preferably, the charged particle shielding plate is a polytetrafluoroethylene plate.
Preferably, the assembly shielding box comprises a shielding box body and an aiming laser pen, wherein a box body front through hole and a box body rear through hole are respectively formed in the front end and the rear end of the shielding box body, the box body front through hole and the front through hole on the yoke assembly are coaxially arranged, and the box body rear through hole and the rear through hole on the yoke assembly are coaxially arranged; the laser pen that aims is close to through-hole setting behind the box, just aim laser pen transmitting laser can pass from back to front behind the box through-hole behind the yoke subassembly, the preceding through-hole of yoke subassembly and before the box through-hole, incident target surface at last to realize aiming.
Preferably, the shielding box body is a cuboid box body, and the front through hole of the box body and the rear through hole of the box body are respectively arranged on the front panel and the rear panel of the shielding box body;
the front panel of the shielding box body is made of tungsten-copper alloy, the other five panels are made of nonmagnetic stainless steel, and the front side and the rear side of the front panel of the shielding box body are respectively provided with an outer shielding plate and an inner shielding plate;
and the shielding box body is also provided with a cable protection pipeline for isolating the cable from the external electromagnetic environment.
Compared with the prior art, the invention has the following technical effects:
the image sensing detector comprises an assembly box, a scintillator, an optical fiber panel and a CMOS sensor, wherein the scintillator, the optical fiber panel and the CMOS sensor are all arranged on the assembly box, the scintillator is connected with the CMOS sensor through the optical fiber panel, an electron beam can only be incident on the scintillator after passing through a magnet assembly, and generated scintillation light is transmitted to the CMOS sensor through the optical fiber panel; the invention can prevent electrons from directly entering the CMOS sensor while meeting the requirements of conversion and transmission of the electronic signals, thereby realizing the protection of the CMOS sensor chip and avoiding or reducing the performance deterioration of the CMOS sensor.
Compared with the prior art, other technical schemes in the invention also have the following technical effects:
the unique structural design of the wedge-shaped magnet can meet the requirements of small deflection of low-energy electrons and large deflection of high-energy electrons, so that electrons with larger energy range deflect onto the upper image sensor, and the dynamic range of energy spectrum diagnosis of a single-sided detection structure is improved; in addition, the charged particle shielding plate arranged in the wedge-shaped magnet can shield the interference of X rays generated by directly beating on the yoke assembly after charged particles generated by laser acceleration enter the magnet assembly.
The invention is provided with the shielding box, so that shielding of various secondary radiation and electromagnetic pulse interference generated by experimental targeting can be realized, and the signal-to-noise ratio of signal recording is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an on-line electron spectrometer in an embodiment of the invention;
FIG. 2 is a schematic view of a magnet assembly according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an image sensor according to an embodiment of the present invention;
fig. 4 is a schematic structural view of an assembled shielding box according to an embodiment of the present invention.
In the figure: 1-magnet assembly, 101-wedge magnet, 102-front yoke, 103-back yoke, 104-bottom yoke, 105-side yoke, 106-charged particle shield plate, 2-image sensor, 202-scintillator sheet, 203-fiber optic faceplate, 204-CMOS sensor, 205-mounting box, 206-cable opening, 3-mounting shield box, 301-shield box, 302-aiming laser pen, 303-outer shield plate, 304-inner shield plate, 305-cable protective tubing.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide an online electronic magnetic spectrometer so as to solve the problems in the prior art, and can realize effective protection of a CMOS sensor chip and avoid performance deterioration of the CMOS sensor.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1 to 4, in this embodiment, an on-line electron spectrometer is provided, which includes an assembly shielding case 3, and a magnet assembly 1 and an image sensor 2 mounted in the assembly shielding case 3; as a preferred embodiment, the image sensor 2 and the magnet assembly 1 are sequentially installed in the assembly shielding box 3 from top to bottom; specifically, a first mounting groove and a second mounting groove are sequentially formed in the assembly shielding box 3 from top to bottom, the first mounting groove is used for mounting and fixing the image sensor 2, and the second mounting groove is used for mounting and fixing the magnet assembly 1. In this embodiment, the magnet assembly 1 is used to achieve beam limiting and deflection of the electron beam, so as to achieve separation of electrons with different energies in space, and the image sensor 2 is used to record the electron intensities at different spatial positions and give out an electron energy spectrum.
Specifically, as shown in fig. 3, the image sensor 2 mainly includes an assembly box 205, a scintillator, an optical fiber panel 203, and a CMOS sensor 204, where the scintillator, the optical fiber panel 203, and the CMOS sensor 204 are all mounted on the assembly box 205, and an opening is provided on the assembly box 205, where the scintillator is disposed at the opening, so that an incident surface of the scintillator is not blocked, and an electron beam is conveniently incident on the scintillator; the scintillator is connected with the CMOS sensor 204 through the optical fiber panel 203, and the electron beam is incident on the scintillator after passing through the magnet assembly 1, so as to deposit energy and generate scintillation light, wherein the scintillation light intensity is proportional to the deposition energy of unit electron x the number of electrons of unit area; the scintillation light is in turn transmitted through the fiber optic faceplate 203 to the CMOS sensor 204 for conversion into an electrical signal having an intensity proportional to the light intensity and thus proportional to the unit electrodeposition energy x the number of electrons per unit area.
Further, the assembly box 205 is further provided with a cable port 206, and the cable port 206 is used for allowing a data line and a power line to pass through, and the data line and the power line are connected with the CMOS sensor 204 to realize data transmission and power supply; the electrical signal generated by the CMOS sensor 204 is transmitted to a computer through a data line to be recorded, and the number of electrons with different energies can be extracted through extracting the spatial distribution of the electrical signal, so as to give an electronic energy spectrum.
In this embodiment, the image sensor 2 is adopted, so that electrons can be prevented from directly entering the CMOS sensor 204 while the conversion and transmission of electronic signals are satisfied, thereby protecting the CMOS sensor 204 chip and solving the problem of poor performance of the CMOS sensor 204.
Further, a metal film is further laid on a surface of the scintillator facing away from the optical fiber panel 203, where the metal film is used to shield stray light and interference of soft X-rays, and does not affect incidence of electrons on the scintillator.
In this embodiment, the scintillator is preferably an elongated scintillator sheet 202, and the material is Ce: YAG (cerium-doped yttrium aluminum garnet) material with the length of 230mm and the thickness of less than or equal to 1mm; the metal film is also in a strip structure, and the length and the width of the metal film are larger than those of the scintillator sheet 202, so that the metal film can be completely covered on the scintillator sheet 202, and the thickness of the metal film is 10 mu m.
The optical fiber panel 203 is preferably a right-angled trapezoid, the length of which corresponds to the length of the scintillator sheet 202, the inclined surface is closely attached to the rear surface (the surface facing away from the metal film) of the scintillator sheet 202, and the right-angle surface opposite to the inclined surface is closely attached to the front surface of the CMOS sensor 204, and the CMOS sensor 204 is also of a long-strip structure, and the length of which corresponds to the length of the scintillator sheet 202.
In this embodiment, as shown in fig. 2, the magnet assembly 1 is preferably a two-pole magnet assembly, and mainly includes a wedge magnet 101 and a yoke assembly; the two wedge-shaped magnets 101 are arranged in parallel, a gap is reserved between the two wedge-shaped magnets 101, the distance between the two wedge-shaped magnets 101 is preferably 10mm plus or minus 1mm, the magnetic field direction of the wedge-shaped magnets is perpendicular to the opposite magnet faces on the two wedge-shaped magnets 101, and the magnetic field strength is preferably 0.6T. The yoke assembly surrounds the wedge-shaped magnet 101, a front through hole is formed in the front end of the yoke assembly, a rear through hole is formed in the rear end of the yoke assembly, the front through hole and the rear through hole are coaxially arranged, the front through hole is used for introducing electron beams and limiting the width of the electron beams entering the magnet assembly 1, and therefore the number of electrons incident on the image sensor 2 and the energy spectrum resolution of diagnosis are determined.
Specifically, the two wedge magnets 101 have the same structure and each include a front right-angle side, a rear right-angle side, an upper right-angle side, a lower right-angle side and a bevel side, wherein the upper end and the lower end of the rear right-angle side are respectively and vertically connected with the rear end of the upper right-angle side and the rear end of the lower right-angle side, the lower end of the front right-angle side is vertically connected with the front end of the lower right-angle side, and the upper end of the front right-angle side is connected with the front end of the upper right-angle side through the bevel side; the length of the upper right-angle side is smaller than that of the lower right-angle side, the length of the front right-angle side is smaller than that of the rear right-angle side, and the inclined side is arranged close to the front through hole, namely, the inclined side is located in the incidence direction of the electron beam. As a preferred embodiment, the front right-angle side has a length of 20mm, the rear right-angle side has a length of 100mm, the upper right-angle side has a length of 100mm, and the lower right-angle side has a length of 220mm.
In this embodiment, the yoke assembly mainly includes a front yoke 102, a rear yoke 103, a bottom yoke 104 and side yokes 105, the side yokes 105 are provided with two pieces, the front ends of the two pieces of side yokes 105 are respectively connected with two sides of the front yoke 102, the rear ends are respectively connected with two sides of the rear yoke 103, and the bottom yoke 104 is connected between bottoms of the front yoke 102, the rear yoke 103 and the two pieces of side yokes 105; the two wedge magnets 101 are located in a space surrounded by the front yoke 102, the rear yoke 103, the bottom yoke 104 and the two side yokes 105, the shapes and the sizes of the two side yokes 105 are matched with those of the two wedge magnets 101, the inner walls of the two side yokes 105 are respectively attached to the side surfaces of the two wedge magnets 101, the front yoke 102 is parallel to the front right-angle side of the wedge magnets 101 and has a space, the rear yoke 103 is parallel to the rear right-angle side of the wedge magnets 101 and has a space, and the bottom yoke 104 is parallel to the lower right-angle side of the wedge magnets 101 and has a space.
Further, the front through hole is provided in the front yoke 102, the rear through hole is provided in the rear yoke 103, and the front through hole is located at the center of the front yoke 102, preferably 1mm in diameter, for introducing an electron beam and limiting the width of the electron beam.
The above structural design of the wedge magnet 101 in this embodiment can satisfy the small deflection of low-energy electrons and the large deflection of high-energy electrons, so that electrons with larger energy range deflect onto the upper image sensor 2, and the dynamic range of energy spectrum diagnosis of the single-sided detection structure is improved.
In this embodiment, a charged particle shielding plate 106 is disposed between the front right-angle side of the wedge-shaped magnet 101 and the front yoke 102, between the rear right-angle side of the wedge-shaped magnet 101 and the rear yoke 103, and between the lower right-angle side of the wedge-shaped magnet 101 and the bottom yoke 104, for shielding the interference of X-rays generated by direct striking on the yoke assembly after the charged particles generated by laser acceleration enter the magnet assembly 1; the above-mentioned charged particle shielding plates 106 are respectively attached to the front yoke 102, the rear yoke 103, and the bottom yoke 104, and the front shielding plate through holes corresponding to the front through holes are formed in the charged particle shielding plates 106 on the front yoke 102, and the rear shielding plate through holes corresponding to the rear through holes are formed in the charged particle shielding plates 106 on the rear yoke 103.
In this embodiment, the charged particle shielding plate 106 is preferably a polytetrafluoroethylene plate.
In this embodiment, as shown in fig. 4, the assembled shielding box 3 mainly includes a shielding box 301 and an aiming laser pen 302, where a front end and a rear end of the shielding box 301 are respectively provided with a box front through hole and a box rear through hole, the box front through hole is coaxially disposed with the front through hole on the yoke assembly, and the box rear through hole is coaxially disposed with the rear through hole on the yoke assembly; the aiming laser pen 302 is close to the rear through hole of the box body, and the laser emitted by the aiming laser pen 302 can sequentially pass through the rear through hole of the box body, the rear through hole of the yoke assembly, the front through hole of the yoke assembly and the front through hole of the box body from back to front and finally is incident on the target surface, so that the aiming of the system, namely the aiming of the magnet assembly 1 and the assembled shielding box 3, is realized. The aiming laser pen 302 is mounted on an adjusting bracket, the adjusting bracket can adjust the position and the angle of the aiming laser pen 302, which is a common device in the field, and can be selected from the market according to specific needs, so that repeated description is omitted in the embodiment.
In this embodiment, the shielding box 301 is preferably a rectangular box, and the front through hole of the box and the rear through hole of the box are respectively formed on the front panel and the rear panel of the shielding box 301; further, the material of the front panel of the shielding box 301 is preferably tungsten copper alloy, so as to effectively shield the strong X-ray interference incident from the front; the other five panels are preferably made of non-magnetic stainless steel for shielding relatively weak X-ray interference in other directions and reducing the overall weight. An outer shielding plate 303 and an inner shielding plate 304 are respectively arranged on the front side and the rear side of the front panel of the shielding box 301, the outer shielding plate 303 is used for shielding interference of electrons generated by laser targeting, and the inner shielding plate 304 is used for shielding interference of low-energy cyclotron electrons; wherein, the outer shielding plate 303 and the inner shielding plate 304 are preferably plastic plates.
In this embodiment, the shielding box 301 is further provided with a hollow cable protection pipe 305, and the cable protection pipe 305 is preferably disposed on the rear panel, so as to protect the cable and isolate the cable from the external electromagnetic environment, thereby shielding the interference of the laser targeting electromagnetic environment; wherein the cable protection conduit 305 is a metal conduit.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. An on-line electron magnetic spectrometer, characterized in that: the device comprises an assembly shielding box, a magnet assembly and an image transmission detector, wherein the magnet assembly and the image transmission detector are arranged in the assembly shielding box; the magnet assembly is used for realizing beam limiting and deflection of the electron beam, so that separation of electron spaces with different energies is realized; the image sensor comprises an assembly box, a scintillator, an optical fiber panel and a CMOS sensor, wherein the scintillator, the optical fiber panel and the CMOS sensor are all installed on the assembly box, the scintillator is connected with the CMOS sensor through the optical fiber panel, an electron beam can be incident on the scintillator after passing through the magnet assembly, and scintillation light is generated and can be transmitted to the CMOS sensor through the optical fiber panel.
2. The on-line electron spectrometer of claim 1, wherein: the scintillator is a strip-shaped scintillator sheet, the optical fiber panel is a right-angle trapezoid plate, the length of the optical fiber panel is the same as that of the scintillator sheet, the inclined plane is clung to the rear surface of the scintillator sheet, a right-angle surface opposite to the inclined plane is clung to the front surface of the CMOS sensor, and the CMOS sensor is of a strip-shaped structure and has the same length as that of the scintillator sheet;
the scintillator thin film is characterized in that a metal thin film is further paved on one surface of the scintillator thin film, which is opposite to the optical fiber panel, and the metal thin film is of a strip-shaped structure, and the length and the width of the metal thin film are both larger than those of the scintillator thin film.
3. The online electron spectrometer of claim 1 or 2, wherein: the assembly box is further provided with a cable port, the cable port is used for allowing a data wire and a power wire to pass through, and the data wire and the power wire are connected with the CMOS sensor.
4. The on-line electron spectrometer of claim 1, wherein: the magnet assembly comprises a wedge magnet and a yoke assembly; the wedge magnets are arranged in parallel, a gap is reserved between the two wedge magnets, and the magnetic field direction of the wedge magnets is perpendicular to the magnet faces of the two wedge magnets which are oppositely arranged; the yoke assembly surrounds the wedge-shaped magnet, a front through hole is formed in the front end of the yoke assembly, a rear through hole is formed in the rear end of the yoke assembly, the front through hole and the rear through hole are coaxially arranged, the front through hole is used for introducing an electron beam and limiting the width of the electron beam, and the electron beam can enter gaps of the two wedge-shaped magnets and is incident on the scintillator.
5. The on-line electron spectrometer according to claim 4, wherein: any wedge-shaped magnet comprises a front right-angle side, a rear right-angle side, an upper right-angle side, a lower right-angle side and a bevel edge, wherein two ends of the rear right-angle side are respectively and vertically connected with the rear end of the upper right-angle side and the rear end of the lower right-angle side, one end of the front right-angle side is vertically connected with the front end of the lower right-angle side, and the other end of the front right-angle side is connected with the front end of the upper right-angle side through the bevel edge; the length of the upper right-angle side is smaller than that of the lower right-angle side, the length of the front right-angle side is smaller than that of the rear right-angle side, and the bevel edge is arranged close to the front through hole.
6. The on-line electron spectrometer according to claim 5, wherein: the yoke assembly comprises a front yoke, a rear yoke, a bottom yoke and side yokes, wherein two side yokes are arranged, the front ends of the two side yokes are respectively connected with two sides of the front yoke, the rear ends of the two side yokes are respectively connected with two sides of the rear yoke, and the bottom yoke is connected between the bottoms of the front yoke, the rear yoke and the two side yokes; the inner walls of the two side yokes are respectively attached to the side surfaces of the two wedge-shaped magnets, the front yoke is parallel to the front right-angle side of the wedge-shaped magnets and has a distance, the rear yoke is parallel to the rear right-angle side of the wedge-shaped magnets and has a distance, and the bottom yoke is parallel to the lower right-angle side of the wedge-shaped magnets and has a distance;
the front yoke is provided with the front through hole, the rear yoke is provided with the rear through hole, and the front through hole is positioned at the center of the front yoke.
7. The on-line electron spectrometer according to claim 6, wherein: charged particle shielding plates are arranged between the front right-angle side of the wedge-shaped magnet and the front yoke, between the rear right-angle side of the wedge-shaped magnet and the rear yoke, and between the lower right-angle side of the wedge-shaped magnet and the bottom yoke; the front shielding plate through holes corresponding to the front through holes are formed in the charged particle shielding plates between the wedge-shaped magnets and the front yokes, and the rear shielding plate through holes corresponding to the rear through holes are formed in the charged particle shielding plates between the wedge-shaped magnets and the rear yokes.
8. The on-line electron spectrometer of claim 7, wherein: the charged particle shielding plate is a polytetrafluoroethylene plate.
9. The online electron spectrometer of any of claims 4-8, wherein: the assembly shielding box comprises a shielding box body and an aiming laser pen, a box body front through hole and a box body rear through hole are respectively arranged at the front end and the rear end of the shielding box body, the box body front through hole and the front through hole on the yoke assembly are coaxially arranged, and the box body rear through hole and the rear through hole on the yoke assembly are coaxially arranged; the laser pen that aims is close to through-hole setting behind the box, just aim laser pen transmitting laser can pass from back to front behind the box through-hole behind the yoke subassembly, the preceding through-hole of yoke subassembly and before the box through-hole, incident target surface at last to realize aiming.
10. The on-line electron spectrometer of claim 9, wherein: the shielding box body is a cuboid box body, and the front through hole of the box body and the rear through hole of the box body are respectively arranged on the front panel and the rear panel of the shielding box body;
the front panel of the shielding box body is made of tungsten-copper alloy, the other five panels are made of nonmagnetic stainless steel, and the front side and the rear side of the front panel of the shielding box body are respectively provided with an outer shielding plate and an inner shielding plate;
and the shielding box body is also provided with a cable protection pipeline for isolating the cable from the external electromagnetic environment.
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