457 results about "Field coil" patented technology

The invention relates to the technical field of tokamak device parts, in particular to a supporting system for a polar field coil in a tokamak device. Comprising a toroidal field coil, two first polar field coils, two second polar field coils, two third polar field coils, two first supporting assemblies, two second supporting assemblies and a third supporting assembly, one first supporting assembly is used for fixedly connecting the top end of the toroidal field coil with one first polar field coil, and the other first supporting assembly is used for fixedly connecting the top end of the third polar field coil. And the other first supporting assembly is used for fixedly connecting the bottom end of the annular field coil and the other first polar field coil. Wherein one second supporting assembly is used for fixedly connecting the upper part of the toroidal field coil and one second polar field coil, and the other second supporting assembly is used for fixedly connecting the lower part of the toroidal field coil and the other second polar field coil. And the third supporting assembly is used for fixedly connecting the middle part of the annular field coil and the two third polar field coils.

A magnetic flux modulated type magnetic gear includes a small number of poles mechanism which has a plurality of magnetic poles, a large number of poles mechanism which has more magnetic poles than the small number of poles mechanism, and a pole piece which is provided between the small number of poles mechanism and the large number of poles mechanism, wherein, in the magnetic pole of the large number of poles mechanism, a permanent magnet and a magnetic field coil are provided. And the magnetic field coil is connected to a direct current power supply, which can be turned on and off.

The invention discloses a multipath cascade coil assembly power-on aging intelligent detection device and a test method, relates to the technical field of hydraulic servo valve detection, adopts a cascade expansion mode, and can meet the requirement of the actual production coil aging number according to the number of field actual aging coil loads and the number of cascade splicing coil aging test boards. Through matched testing software, the actual current magnitude and the aging time duration of a coil assembly needing to be aged are independently set, the actual coil current value and the coil resistance value in the aging process are monitored in real time, the abnormal coil assembly is subjected to color distinguishing alarm management, and the fault time and state are recorded; and the actual production process requirements of the field coil assembly can be well met, and the convenience and operability are greatly improved.

The invention provides a normal-temperature fusion target assembly, a laser fusion reactor system and a laser fusion power generation method.The fusion target assembly comprises a pair of coaxial compression cones with opposite cone tops, the compression cones are filled with normal-temperature boron deuteride lithium spherical crown targets, the fusion target assembly further comprises an ignition cone, and the cone tip end of the ignition cone is sleeved with a magnetic field coil; according to the light fusion power generation method, a spherical crown target is driven by compressed laser to generate centripetal implosion, high-density isometric plasma with a steep edge is formed near the sphere center in a collision mode, and tritium production reaction and fusion ignition combustion are generated by the collision plasma under driving of ignition laser. Energy released by high repetition frequency fusion is converted into electric energy which is stably output by a thermodynamic system; the invention further provides a laser nuclear fusion reactor system which is high in repetition frequency, low in cost and low in radioactivity.

An annular confinement plasma vessel having a substantially symmetric magnetically confinement plasma region wherein the plurality of magnetic field coils are configured to provide at least one X-point and direct plasma particles from the magnetically confinement region to the divertor target; and wherein the total magnetic field strength (including all components of the magnetic field) at the divertor target is lower than the total magnetic field strength (including all components of the magnetic field) at a location between the divertor target and the X point on the last closed flux surface of the SOL closest to the divertor target. When the mean free path of the neurons is longer than the width of the SOL, the two critical functions can be separated: a) withstanding high heat flux, and b) pumping plasma particles to maintain low density.

The invention belongs to the technical field of electronic parts, and provides a damping-adjustable roller structure and a damping adjusting method. The first annular shaft is fixed to the mounting base, and a plurality of first bosses are evenly arranged on the end face of the first annular shaft; the second annular shaft is rotationally arranged on the mounting base, the second annular shaft and the first annular shaft are coaxially arranged, and second bosses are evenly arranged on the surface of the end, facing the first boss, of the second annular shaft; the first annular shaft is provided with a magnetic field coil, the magnetic field coil is used for adjusting the magnetic intensity of the first annular shaft, gaps are formed between the first bosses and the second bosses, and the first bosses and the second bosses are arranged in a one-to-one correspondence mode. The magnetic field intensity of the first annular shaft is changed by adjusting the current magnitude and direction of the magnetic field coil, so that the magnetic attraction force between the first boss and the second boss is adjusted, and the damping is adjustable when the second annular shaft rotates. Meanwhile, the magnetic field coil can convert kinetic energy of the second annular shaft into electric energy to achieve the technical effect of electric energy collection.

The invention discloses a chip atom vector magnetometer based on a topological posture surface emitting laser. The device is characterized by comprising a topological posture PCSEL, a beam shaping unit, a polarizer, a quarter-wave plate, a voltage-controlled laser polarization rotator, an atomic gas chamber, a Wollaston prism, a dual-channel photoelectric detector, a filter module, a laser frequency stabilization unit, a precession signal modulation and demodulation module and a laser polarization and Larmor magnetic field direction adjustment module, the system comprises a two-dimensional Larmor magnetic field coil, a servo feedback module, a direct digital frequency synthesis module and a high-stability crystal oscillator. The topological posture laser is used for the chip atom vector magnetometer, magnetic vector parameter measurement which is more immune to temperature fluctuation and more excellent in performance is innovatively achieved for an external magnetic field, complete information of the vector magnetic field can be measured at the same time, and the chip atom vector magnetometer can be used for the fields of material defect detection, mineral oil and gas exploration, underwater magnetic target positioning and the like.

The invention provides a CPT atomic clock magnetic field coil constant calibration system and method.The CPT atomic clock magnetic field coil constant calibration system comprises a CPT atomic clock, a frequency measurement module and an upper computer, the upper computer is used for setting the number of times of measurement, calculating a third analog signal in each time of measurement according to a first digital signal in each time of measurement, and sending the third analog signal to the CPT atomic clock; calculating the actual clock transition frequency during each measurement according to the frequency division number of the phase-locked loop circuit and the frequency of the clock signal during each measurement, calculating the external magnetic field during each measurement according to the actual clock transition frequency during each measurement, and finally performing linear fitting according to the external magnetic field during multiple measurements and the third analog signal to obtain a third analog signal; and obtaining a magnetic field coil constant. The invention provides a CPT atomic clock magnetic field coil constant calibration system and method. The system and method are used for solving the problems that a magnetic field coil in a CPT atomic clock is small and cannot be measured, current distribution calculation is complex due to the fact that magnetic shielding is applied, and the actual winding condition of the coil cannot be accurately simulated during simulation.

The invention discloses a water-cooling pulsed high-intensity magnetic field coil, and belongs to the technical field of pulsed high-intensity magnetic fields. The coil adopts a laminated structure, each laminated sheet is provided with an opening and a boss, and a spiral structure is formed through electrical connection of the bosses. Each lamination is divided into a through-flow part, a water cooling part and a fixed part; the through-flow part is made of red copper, the water cooling part and the fixing part are made of stainless steel, and an integrated copper-steel composite structure is formed through welding. The water-cooling part is provided with water-cooling grooves welded and sealed by a cover plate; and the water-cooling grooves of the laminations are connected in series through water inlet and outlet holes to form a cooling flow channel. The fixing part is provided with a semicircular fixing hole used for limiting and flow guiding. And an insulating sheet is arranged between the adjacent laminations. The coil is pressed tightly through the upper and lower pressing plates and an insulated fixing stud. Through lamination partitioning and copper-steel compounding, the high-strength and efficient water-cooling capacity is achieved, and the problems of insufficient strength and cooling of the pulse high-intensity magnetic field coil under repetition frequency work are effectively solved.

The invention discloses a transfer device and a transfer method for transferring a polar field coil of a nuclear fusion device, and relates to the technical field of transfer of parts of the nuclear fusion device. The transfer device comprises a moving mechanism, a supporting mechanism, a supporting piece and a limiting piece, the supporting mechanism is fixedly arranged on the moving mechanism, and a supporting arm is formed on the supporting mechanism; the supporting pieces are in one-to-one correspondence with the supporting arms, each supporting piece is movably arranged in the extending direction of the corresponding supporting arm, and a clamping cavity used for containing at least part of the polar field coil is defined in each supporting piece; the limiting pieces correspond to the supporting arms one to one, each limiting piece is arranged on the corresponding supporting arm, the limiting pieces and the supporting pieces are connected through adjusting pieces, and the adjusting pieces are used for adjusting the distance between the supporting pieces and the limiting pieces. According to the transfer device, the transfer requirements of the polar field coil with large size, heavy weight and strict requirements can be met, it is guaranteed that the polar field coil is accurate in pose and reasonable in stress in the transfer process, and the requirements of the dynamic load coefficient and the unbalance load coefficient are met.

The invention discloses a quadrupole / octupole composite iron system for beam homogenization. The composite iron system comprises a composite magnet current control device, a composite magnet main power supply and quadrupole / octupole composite iron, the composite magnet current control device is used for controlling a composite magnet main power supply to output quadrupole field coil current and octupole field coil current of quadrupole / octupole composite iron. The quadrupole / octupole composite iron is used for simultaneously generating a dominant quadrupole magnetic field and an octupole magnetic field, so that the effects of quadrupole iron and octupole iron can be simultaneously realized by only installing one transmission element; according to the invention, a quadrupole magnetic field and an octupole magnetic field are generated in the aperture of the composite iron, focusing and homogenization of beam envelope are realized at the same time, the number of transmission elements can be reduced, the length of a transmission line can be shortened, and the construction cost of the beam transport line is reduced. The problem that traditional quadrupole iron and octupole iron cannot be simultaneously installed at the maximum beam envelope position due to the space problem and cannot play a great role of a magnet is solved.

The utility model discloses an axial magnetic flux motor adopting a printed winding, which comprises a stator, the stator comprises a printed circuit board and a plurality of stator cores, the printed circuit board is formed by combining a plurality of PCB windings, a mounting hole is arranged in the middle of each PCB winding, the stator cores are mounted in the mounting holes, the stator cores are formed by winding magnetic conductive amorphous materials, and the printed circuit board and the stator cores are arranged in the mounting holes. After the stator core is arranged in the center of the coil, the equivalent air gap is the physical air gap, the magnetic resistance is small, the power density is high, materials can be greatly saved, the power density is improved, the stator core made of the magnetic conductive amorphous material greatly simplifies the processing and manufacturing process of the motor, and the stator core is greatly helpful for batch production of the motor. In addition, the coil does not face the alternating magnetic field of the air gap in the main magnetic circuit, the eddy current on the coil is inhibited, the efficiency is ensured, the stator core is formed by winding the amorphous material, the amorphous material can meet the high-frequency occasion, the iron loss at high speed and high frequency is very small, and the high-speed efficiency of the motor can be well ensured.

The invention belongs to the field of magnetic particle imaging, particularly relates to a zero-inertia magnetism gathering ring magnetic-field-free line magnetic particle imaging system and method, and aims to solve the problems of low magnetic field gradient, high magnetic field control complexity and limited imaging space. The current of a gradient magnetic field coil group is generated by a magnetic field control and imaging module, is output by a signal acquisition and output module, and is amplified and provided by a gradient power amplifier module. The current of the axial excitation magnetic field coil is generated by the magnetic field control and imaging module, is output by the signal acquisition and output module and is amplified and provided by the excitation power amplifier module, and a signal received by the multi-axis detection coil is filtered and amplified by the signal processing unit and then is input to the imaging module by the magnetic field control and imaging module for algorithm reconstruction. According to the invention, the magnetic field gradient and the control precision are obviously improved, and the imaging space of the axial fault plane is realized.

The invention belongs to the field of medical care equipment, and particularly relates to an airflow sensor and a vital capacity detector. The airflow sensor comprises a shell, a magnetic field generating device and a coil film. Wherein the shell is made of a non-ferromagnetic material; and an air flow channel with a square section is formed on the inner side of the shell. The shell comprises an upper substrate and a lower substrate which are parallel to each other. The magnetic field generating device is used for generating a fixed magnetic field with the magnetic field intensity changing along with the distance between the upper substrate and the lower substrate of the shell. The coil film comprises a flexible base film and a coil printed on the base film. The coil film is located between the upper substrate and the lower substrate. When gas flows through the gas flow channel in the shell, the coil film vibrates up and down, and then induction signals with the mapping relation with the gas flow intensity are generated at the two ends of the coil. The problems that a sensor part of an existing vital capacity detector cannot be self-powered, and the detection precision is prone to being affected by factors such as environment humidity are solved.

The invention discloses a high-magnetic-field and high-uniformity superconducting magnet system for nuclear magnetic resonance, belongs to the technical field of nuclear magnetic resonance, and solves the problem of how to design a high-magnetic-field-intensity and high-uniformity superconducting magnet system. A high-field area in the magnet is a coil using a niobium-tin superconducting wire, and a low-field area in the magnet uses a coil using a niobium-titanium superconducting wire; the main coils are connected in series to work together, and can generate an effective central magnetic field intensity of 18.8 T when operating at a liquid helium temperature; the design uniformity of a central magnetic field can be superior to 0.01 ppm in a spherical range with the diameter of 1cm; the main magnetic field coil can shield more than 90% of external electromagnetic interference; the shielding coil can effectively control the size of a stray field of a magnet system, and a 5Gs line stray field can be limited in a 1.5 m ellipsoid and a 2.5 m ellipsoid in the radial direction and the axial direction respectively. The method is suitable for a nuclear magnetic resonance spectrometer, animal imaging, Fourier transform ion cyclotron resonance and other scenes.

The invention discloses a high-temperature pipeline magnetostrictive guided wave sensor and a monitoring method, and relates to the field of ultrasonic nondestructive testing. According to the sensor, a wrinkled iron-cobalt alloy belt is used as a sensitive element, and the sensor is in dry coupling contact with a to-be-detected pipeline; the high-temperature-resistant static magnetic field coil is wound on the outer side of the aluminum pre-tightening ring in a solenoid mode, and a bias pulse excitation mode is adopted. Alternately winding the bottom end of the wrinkle structure of the wrinkle-type ferrocobalt alloy belt and the back surface of the belt material, controlling the wrinkle-type ferrocobalt alloy belt to excite a guided wave signal in a pulse section, and receiving the guided wave signal in a bias section; the dynamic magnetic field and the static magnetic field generated by the two groups of coils are perpendicular in direction, and torsional mode guided waves are generated in the high-temperature pipeline based on the reverse Weidmann effect. The sensor is easy to install and stable in performance, the whole structure is resistant to high temperature for a long time, and the engineering problem of high-temperature failure is solved. The method provided by the invention comprises the steps of optimizing pre-tightening force, pulse voltage and bias current parameters, so that the transduction efficiency is improved, and the capability of detecting new defects of the pipeline in high-temperature and variable-temperature states is enhanced.

A superconductor magnet system including a superconductor magnet including a plurality of field coils connected in series, each field coil having a plurality of turns including superconductor material. The system also includes a primary electric current source connected across the plurality of the field coils for supplying a DC electric current to the field coils to generate a magnetic field. The system further includes a secondary electric current source connected in parallel with the primary electric current source across a subset of the field coils for supplying an additional DC electric current to the or each field coil in the subset to modify or correct the magnetic field.

The invention belongs to the technical field of magnetic field coil design, and particularly discloses a method and system for determining a magnetic field coil flow function based on a target field method and Adam. According to the application, the initial value of the control vector of the magnetic field coil structure is solved by using the target field method, the control vector of the magnetic field coil structure is iteratively optimized by using the Adam algorithm, and the flow function of the magnetic field coil is solved by using the optimized control vector of the magnetic field coil structure. The target field method is improved, the biplane gradient coil is designed by setting the expected magnetic induction intensity gradient value of the target point, and the Adam algorithm is used for optimizing the coil structure control vector to approach the optimal solution of the coil structure as much as possible, so that the accuracy of generating the compensation magnetic field by the coil is improved.

The electromagnetic flowmeter comprises a shell and a sphere, connecting pipes are fixedly connected to the two ends of the surface of the shell, first connecting flanges are fixedly connected to the ends, away from each other, of the two connecting pipes, a fixing cylinder is fixedly connected to the center of the top of the shell, and a second connecting flange is fixedly connected to the top end of the fixing cylinder; the sphere is rotationally connected to the center in the shell, a communicating groove is horizontally formed in the shell in a penetrating mode, a rotating mechanism for rotating the sphere is arranged in the shell, and indicating mechanisms are arranged on the two symmetrical sides of the surface of the shell. Through the arrangement of the ball body, the magnetic field coil can be conveniently placed during use, meanwhile, the magnetic field coil can be conveniently protected, and in the use process, the ball body can be rotated to facilitate connection and disconnection of fluid in the shell, so that the use effect of the device is improved, and meanwhile, a rotating disc can be driven to rotate; the flow direction of the fluid of the device can be facilitated through the indicating arrow arranged on the surface of the turntable, and the mounting convenience of the device is improved.

The invention relates to a current control circuit, a focus control circuit and method of an electron beam and a medium. The current control circuit is connected with the magnetic field coil and used for driving the magnetic field coil to generate a target magnetic field; the current control circuit comprises a driving conversion unit and a controller. The driving conversion unit comprises a plurality of cascaded switching tube circuits, and the input end of each switching tube circuit is connected with a corresponding bus voltage source; the output end of the driving conversion unit is connected with the magnetic field coil; and the controller is connected with the driving conversion unit and controls the output of each switching tube circuit in the driving conversion unit so as to control the characteristics of the current output to the magnetic field coil by the driving conversion unit. The current control circuit can meet the requirements of control efficiency and universality at the same time.

The utility model relates to the technical field of electromagnetic vibration tables, in particular to an electromagnetic vibration table convenient for heat dissipation, which comprises a main body mechanism, a functional mechanism, a heat dissipation mechanism and an auxiliary mechanism, the functional mechanism is positioned in the main body mechanism, the heat dissipation mechanism is positioned in the main body mechanism, and the auxiliary mechanism is positioned on one side of the main body mechanism. Excitation signals are sent out through the control panel fixedly installed on one side of the shell of the electromagnetic vibration table, the vibration base connected with the coils is driven through the first magnetic field coil and the second magnetic field coil which are arranged in the magnetic field, and the moving coil upper guiding system and the moving coil lower guiding system are used for stabilizing equipment. A flow guide fan is fixedly installed at the bottom end of the vibration table heat dissipation base, air is sucked in from an equipment air inlet in one side of the electromagnetic vibration table shell and exhausted from an equipment air outlet in one side of the vibration table heat dissipation base, and a fence net is installed between the equipment air inlet and the equipment air outlet, so that foreign matter is prevented from entering and damaging equipment.

A magnetic resonance imaging apparatus according to an exemplary embodiment includes a magnet, a gradient magnetic field coil, a sequence controller, and a plurality of metal shims. The magnet generates a static magnetic field. The gradient magnetic field coil applies a gradient magnetic field to a subject. The sequence controller applies a current to the gradient magnetic field coil by executing a first pulse sequence. The plurality of metal shims is used for passive shimming in which the plurality of metal shims is arranged based on the static magnetic field distribution in a state where a temperature of the gradient magnetic field coil is increased by execution of the first pulse sequence. The sequence controller executes a second pulse sequence for imaging the subject after completion of the passive shimming.

The invention discloses a horizontal two-dimensional orientation steel fiber UHPC wind power tower drum ring piece preparation device and method, and relates to the technical field of wind power tower drum engineering. The device is mainly composed of an annular mold, an annular sliding rail, an electric sliding block, coils and a direct-current power source, the direct-current power source supplies power to the coils on the inner side and the outer side to generate a uniform and controllable magnetic field, the coils are driven by the electric sliding block to achieve synchronous annular rotation, the magnetic field intensity and the action time are adjusted according to different flowing degrees of UHPC mixtures, and therefore the UHPC mixtures can be manufactured. And under the action of a rotating magnetic field, the steel fibers form two-dimensional distribution in a horizontal plane. Compared with a traditional UHPC wind power tower drum, the horizontal two-dimensional directional steel fiber reinforced UHPC wind power tower drum produced by the device has the advantages that the compression bearing capacity is improved by 15%-20%, and the compression fatigue resistance is improved by 40%-50%. According to the tower drum structure, the thickness of the tower drum ring section can be reduced by 10%-20%, the dead weight of the tower drum and the consumption of raw materials are reduced, and the transportation and construction cost is reduced. The device is simple in design and convenient to disassemble and assemble, has efficient and reliable industrial production potential, and can be widely applied to manufacturing and optimization of wind power towers.

The utility model relates to the technical field of magnetic field coil brackets, in particular to an adjustable magnetic field coil bracket, which improves the supporting stability of a magnetic field coil, improves the convenience of rotating and adjusting the magnetic field coil, and improves the convenience of supporting and fixing magnetic field coils with different sizes. Comprising a base and a guide rail, the device comprises a base, a guide rail, a driving device, a power device, a limiting device, a supporting device, two sets of sliding blocks and two sets of supporting shafts, the two sets of sliding blocks are slidably installed on the outer side wall of the guide rail, and the driving device is arranged on the base and used for driving the two sets of sliding blocks to move oppositely. The two ends of the two sets of supporting shafts are rotationally installed on the inner side walls of the two sets of sliding blocks through driving of power devices, limiting devices are arranged on the two sets of sliding blocks and used for limiting the front sides and the rear sides of the supporting shafts, and the supporting devices are arranged on the base and used for supporting and limiting the tops of the magnetic field coils.

The invention discloses a three-axis SERF atom magnetometer orthogonal frequency doubling modulation and demodulation system and method, and the system employs a signal generation module to generate sine and cosine orthogonal modulation signals with the frequency of fm to drive an X-axis magnetic field generation coil and a Y-axis magnetic field generation coil of an SERF atom magnetometer respectively, and generates sine signals with the frequency of 2nfm to drive a Z-axis coil. Open-loop magnetic field signals of X-axis magnetic field components, Y-axis magnetic field components and Z-axis magnetic field components are obtained through three groups of integral filters for full-period integration, driving current of a three-axis magnetic field coil is controlled through a control module to generate a compensation magnetic field, the open-loop magnetic field signals of the X-axis magnetic field components, the Y-axis magnetic field components and the Z-axis magnetic field components are made to be zero, and at the moment, the magnetic field intensity of the atomic gas chamber is zero. The compensation current output by the control module is the X-axis magnetic field intensity signal, the Y-axis magnetic field intensity signal and the Z-axis magnetic field intensity signal measured by the three-axis SERF atom magnetometer. The system can directly extract a three-axis magnetic field resolving signal from a beam of laser signals, eliminates the cross coupling effect during three-axis magnetic field resolving, improves the measurement range and orthogonality of the SERF atomic magnetometer, and has extremely high engineering application value.

The invention discloses an annular field coil power supply of a nuclear fusion magnet power supply system based on a supercapacitor. The annular field coil power supply comprises a charger module, an MMC array module, an annular field coil, a first switch module and a second switch module, the MMC array module comprises a super capacitor; the charger module is used for charging the MMC array module; the MMC array module stores energy from the charger module based on a supercapacitor and is used for outputting a power pulse signal to the annular field coil based on the stored energy; the first switch module and the second switch module are used for controlling the circuit connection of the annular field coil power supply of the nuclear fusion magnet power supply system. According to the invention, based on the characteristic that the supercapacitor has high power density, the MMC array module has efficient electric energy conversion capability, so that the MMC array module can more effectively manage rapid flow of large-scale energy, and can more efficiently supply power to the annular field coil especially in a pulse operation mode of a nuclear fusion device.

The invention discloses a magnetic field intensity adjustable melt stirring system and a control method, and relates to the technical field of metallurgical casting, the magnetic field intensity adjustable melt stirring system comprises a crystallizer having an inner wall and an outer wall, a cooling cavity being formed between the inner wall and the outer wall; the shielding cover is fixedly arranged outside the crystallizer in a sleeving mode, and the magnetic field coil single-layer units are arranged on the inner wall of the shielding cover. The magnetic field intensity adjusting unit is electrically connected with each magnetic field coil single-layer unit and is used for dynamically adjusting the amplitude, the frequency and the waveform of the input current; the solidification interface detection module is arranged on the side wall of the crystallizer and used for detecting the melt solidification interface position in real time; the control module is in signal connection with the solidification interface detection module and the magnetic field intensity adjusting unit. The gradient magnetic field is accurately matched with the melt solidification process, dendritic crystal crushing is accurately strengthened, a traditional rotating assembly is replaced, energy loss generated by bearing friction, mechanical damping, mechanical vibration and the like is eliminated, the mechanical structure is simplified, the electromagnetic efficiency is improved, invalid power supply is avoided, and energy consumption is reduced.

The present invention discloses a DC magnetic field testing device for a magnetic field coil, comprising a device main body, a display component provided on the front end surface of the device main body, a control button provided on the front end surface of the device main body, a charging port provided on the bottom of the device main body, a probe cable fixedly connected to the top of the device main body, a Hall probe fixedly connected to the other end of the probe cable, a rectangular block fixedly connected to the outer surface of the Hall probe, a protective tube fixedly connected to the right side surface of the device main body, a storage component fixedly connected to the back of the device main body, and a charging component provided on the bottom of the device main body; the DC magnetic field testing device for a magnetic field coil can more intuitively display the remaining power of the device by providing the display component, and can issue an alarm when the power is too low to remind the user to charge; the protective component provided can protect the Hall probe after use to prevent damage to the probe.

The invention provides a coil framework, a coil structure and a nuclear fusion reaction device, the coil framework comprises a first framework part and a second framework part, the first framework part is in an annular cylinder shape, the second framework part is in an annular plate shape, and the second framework part sleeves the outer ring surface of the first framework part; the first framework part is used for bearing a coil winding by using the outer ring surface; a cold conduction channel extending in the annular direction is embedded in the first framework part and / or the second framework part and used for containing a cold conduction medium. The coil framework can achieve a good cooling effect on the coil winding, it is guaranteed that the working stability of the annular magnetic field coil is high, and the nuclear fusion reaction effect can be correspondingly improved.

Provided is an RF shield that achieves a balance between an improved irradiation efficiency and suppression of eddy current-induced heat by a gradient magnetic field coil, while avoiding complexity of conductor pattern design for suppressing an eddy current by the gradient magnetic field coil.A cylindrical RF shield, which is one of elements constituting a high-frequency coil unit, is formed by rolling patterned conductive thin films formed on both front and back surfaces of an insulating sheet, front and back patterns of the patterned conductive thin film are mirror-symmetrical in a central axis direction of a cylinder, the front pattern is divided into two in the central axis direction, one side of two divided patterns is further divided into two in a circumferential direction, each of three independent pattern islands has slits such that strips are formed along to the cylinder axis direction, and each of the strips has a portion connected in an up-down direction at one location.