393 results about "Lorentz force" patented technology

The present disclosure relates to a head-dedicated magnetic resonance imaging (MRI) device, wherein a head-dedicated image is acquired in a state in which a head of a subject is positioned in a center of a magnetic field of a main magnet installed in a housing, a local coil manufactured in in the form of being inserted into or worn in a human body of the subject is utilized to acquire an image of a selected portion to be examined (for example, an oral region, an ear region, and an eye region) of the head, or a vibration absorber installed around the housing absorbs vibrations caused by the Lorentz force generated by a magnetic field of the main magnet and a current applied to a gradient coil while the image is acquired in a state in which the housing is hung on an installation frame.

The invention provides a motion simulation method and system for charged particles in a magnetic field, and the method comprises the steps: substituting the magnetic vector potential of an electromagnetic field where the charged particles are located into an established kinetic equation, solving the kinetic equation, and obtaining the motion trail of the charged particles; the kinetic equation is a Hamiltonian equation corrected by a narrow relativistic added with Lorentz force. The method has the advantages that a more comprehensive simulation method for the movement of the charged particles in the electromagnetic field is constructed, a simulation model based on energy conservation is considered, the divergence behavior of long-period prediction of a simulation system is improved, and long-period and high-precision simulation of the high-speed charged particles in the earth magnetic field is achieved.

The invention relates to a high-field animal magnetic resonance imaging superconducting magnet, a gradient coil and a decoupling method. Wherein the superconducting magnet comprises two main coils, four adjusting coils and three shielding coils, and nine first-order, second-order and third-order axial superconducting shimming coils are arranged in the superconducting magnet; the gradient coil comprises an active shielding magnetic field coding coil and further comprises 11 coils in the zero-order axial direction, the second-order axial direction, the third-order axial direction and the fourth-order axial direction. Electromagnetic coupling and mechanical coupling between the superconducting magnet and the gradient coil are optimized, the basic judgment standard is that the minimum distance between coil wires is appropriate, engineering processing is feasible, and therefore the minimum stray magnetic field of the gradient coil and the minimum electromagnetic Lorentz force are obtained. Cooperative stable operation can be guaranteed without additional connection processing between the two functional parts. The superconducting magnet shielding effect is excellent, the gradient coil shielding effect is excellent, and strong Lorentz force coupling between the superconducting magnet and the gradient coil is effectively eliminated.

The invention discloses a magnetofluid type silicon controlled rectifier radiator and a heat dissipation control method thereof. The radiator comprises a silicon controlled rectifier, a magnetic fluid chamber is attached to the outer side of the silicon controlled rectifier, the magnetic pole array is installed in the magnetic fluid chamber, and cooling fins are assembled outside the magnetic fluid chamber. When alternating current is introduced into the cavity where the magnetic fluid liquid chamber is located, the alternating current and the magnetic field interact to generate Lorentz force, the Lorentz force drives the magnetic fluid to form directional eddy current so as to achieve convective heat exchange on the silicon controlled rectifier, and heat absorbed by the magnetic fluid and air are subjected to heat exchange through the cooling fins. Junction temperature out-of-control caused by local hot spots of the silicon controlled rectifier can be solved, secondary damage of mechanical vibration of a heat dissipation system to welding spots is eliminated, and the highest junction temperature area of the silicon controlled rectifier is focused and cooled according to needs.

The invention relates to the technical field of nondestructive testing, in particular to an electromagnetic acoustic emission excitation device for pipeline weld crack detection, which comprises a crack-containing pipeline test piece, and an electromagnetic shielding shell, a rectangular permanent magnet and a double D-shaped coil which are arranged above the crack-containing pipeline test piece, when high-frequency alternating current is introduced into the double-D-shaped coil, eddy current is induced under the action of an external magnetic field, the eddy current generates Lorentz force under modulation of the magnetic field, local mass points at the tip of a crack are caused to vibrate, and an acoustic emission signal is excited. The electromagnetic shielding shell can control magnetic field distribution, the magnetic field is focused at the tip of a crack, the placement direction of the double-D-shaped coil is parallel to the crack propagation direction, and the rectangular permanent magnets generate magnetic fields in opposite directions in a straight wire area, so that the stress directions of the two sides of the crack are opposite, and the crack is pulled; the signal-to-noise ratio of generated acoustic emission signals is increased, the detection rate of pipeline weld cracks can be increased, and the method has high application value.

The invention relates to the technical field of magnesium alloy material processing, in particular to a magnetic pulse generation cast-rolling casting nozzle with a solidification structure regulation effect, which comprises a casting nozzle main body unit, a transmission unit and a magnetic pulse generation unit. The motor drives the coil box to move to the position close to the roller along the guide rail, so that a pulse electromagnetic field generated by the coil accurately acts on the solidification front edge; a plurality of positioning grooves are formed in the coil box, the coil can be divided into a middle coil and an edge coil, pulse electromagnetic fields are generated by utilizing currents with different intensities and frequencies at the edge and the middle, a solidification structure generates an induced magnetic field and is subjected to the action of Lorentz force, structure exchange is formed, and the consistency of the temperatures of the middle and the edges of a cast-rolling area is guaranteed; therefore, the shape of the cast-rolling solidification welding line is regulated and controlled. The method can promote nucleation at the solidification front edge, effectively refine the solidification structure, reduce macrosegregation, improve the problem of non-uniform cooling of the casting-rolling middle part and the casting-rolling edge part and effectively inhibit magnesium alloy casting-rolling edge cracks, and has important application value in the casting-rolling field.

The invention relates to a preparation method of a magnetic field-electric field synergistically driven Fe3O4-loaded graphene three-dimensional interlocking network / metal composite material, and belongs to the field of electronic packaging materials. An alternating magnetic field and a direct-current electric field are applied in the solidification process of metal melt, Lorentz force is used for driving graphene nanosheets loaded with Fe3O4 to rotate directionally and be arranged vertically, meanwhile, the electric field induces dissociation of graphene edge functional groups, chemical bonding with a metal matrix is enhanced, and a space interlocking heat conduction network is formed. The graphene reinforced metal composite material is obviously superior to a traditional graphene reinforced metal composite material and is suitable for a heat dissipation substrate of aerospace electronic equipment.

The invention discloses a wafer carrier with a position correction function, and relates to the technical field of wafer carriers. Comprising a base, a fixed cylinder is arranged on the upper side of the base, damping springs are installed on the outer side of the fixed cylinder, a first coil is embedded in the lower side of the fixed cylinder, the two ends of the first coil are electrically connected with a control system, a guide column is installed in the fixed cylinder, and a detection ball and a push plate are installed between the fixed cylinder and the guide column; a wafer is carried on the carrying plate, a conducting medium is arranged on the carrying plate, the conducting medium annularly flows along the inner wall of the outer ring electrode under the influence of Lorentz force, the heated conducting medium annularly flows in the heating cavity and continuously makes contact with the heating wire, the temperature of the conducting medium is more uniform, and the heating efficiency is improved. Therefore, the overall temperature of the heating chamber becomes uniform, so that the wafer and the tray are preheated by the carrying groove, the wafer reaches the required temperature, and the wafer processing efficiency is improved.

The invention discloses a novel induction-type magneto-thermo-acoustic detection method for the conductivity of a supercapacitor, and relates to the technical field of nondestructive material detection.The method comprises the steps that a steady-state static magnetic field and a pulse alternating magnetic field are introduced to form a composite excitation field, and a magneto-acoustic effect and a thermo-acoustic effect are simultaneously and cooperatively excited in a solid-state electrode material; the magnetoacoustic-thermoacoustic coupling effect is formed, eddy current induced by a pulse alternating magnetic field in the material not only generates joule heat, but also generates a direct carrier of Lorentz force under the action of a steady-state static magnetic field, the two physical effects are derived from the same electromagnetic excitation process, but the mechanisms for generating acoustic signals are complementary to each other, so that the effect of the magnetoacoustic-thermoacoustic coupling is achieved. The two effects are coupled as a unified sound source item, a sound pressure wave equation is established, the equation describes a sound field excitation process under the combined action of a force source and a heat source, the coupling mechanism remarkably enhances the strength and information abundance of ultrasonic signals, and the inherent defect that a single thermoacoustic detection method is insensitive to a high-conductivity material is overcome.

An electromagnetic relay includes a fixed terminal, a movable contact piece, a first contact, a second contact, a movable mechanism, and a magnet unit. The first contact is disposed on one of the fixed terminal or the movable contact piece. The second contact is disposed on another of the fixed terminal or the movable contact piece. The magnet unit generates a magnetic field to apply a Lorentz force to an arc generated between the first contact and the second contact. The magnet unit applies the Lorentz force in a first direction to the arc when a current flowing through the arc is directed from the second contact toward the first contact. In a state in which the first contact is in contact with the second contact, a center position of the first contact and a center position of the second contact are shifted from each other in the first direction.

A kind of method for melting pole twisted wire arc magnetic spin control welding.The prior art twisted wire welding is prone to produce blowhole in weld inside when large current welding, and excessive heat input will cause changes in structure and performance in joint area, such as problems of weld zone grain growth, joint plasticity, toughness and other mechanical properties decline, etc.The present application comprises: twisted wire welding electrode arc welding point, a coaxial coil is arranged around the twisted wire welding electrode arc welding point, direct current is passed into the coaxial coil to form longitudinal magnetic field, the force direction of longitudinal magnetic field on twisted wire welding arc should be consistent with the self-rotating direction of twisted wire welding arc, and opposite to the twisting direction of twisted wire, the direction of longitudinal magnetic field is controlled by the direction of direct current, while twisted wire melts to form its own twist angle release, the twist angle release is affected by Lorentz force to make the rotational angular velocity of twisted wire welding arc rapidly increase, to realize high-speed directional rotation of twisted wire welding arc.The present application is used for melting pole twisted wire arc magnetic spin control welding method.

The invention belongs to the technical field of photocatalytic water dissociation, and relates to a method for enhancing the photocatalytic oxygen evolution reaction efficiency of a nanorod array material through a magnetic field. According to the invention, ZnO nanorod arrays are placed at three relative positions of a cubic parallel uniform magnetic field with adjustable magnetic field intensity for photocatalytic OER. The constructed magnetic field regulation and control device is mainly composed of two parallel coils which are connected in series. The electromagnetic effect is generated through the coil, and rapid adjustment of the magnetic field is facilitated. And magnetic induction lines between the parallel coils connected in series are uniformly distributed in parallel, so that the direction of a magnetic field can be regulated and controlled. Due to the existence of the magnetic fields which are uniformly distributed in parallel among the parallel coils which are connected in series, photon-generated carriers moving in catalyst particles move in opposite directions under the action of Lorentz force. And photo-generated electrons (e-) and photo-generated holes (h +) are separated, so that the photocatalytic reaction efficiency is improved. Therefore, the magnetic field regulation and control device can meet the regulation and control of catalytic reaction.

The utility model relates to an electromagnetic water tunnel device, which belongs to the field of hydrodynamic experiments and comprises a base, two electrode plates, a magnetic part and an ion supplement device. Wherein a water channel is formed in the base, and water flows in the water channel; one section of the water channel is a power section; the two electrode plates are respectively positioned on two side walls of the power section; an electric field is formed between the two motor plates; the magnetic part is arranged above the power section; the magnetic field of the magnetic part is perpendicular to a connecting line between the two electrode plates; the ion supplementing device is used for supplementing ions to water in the water channel; water in the power section is electrified through the electrode plate, and Lorentz force is formed through interaction of the magnetic field of the magnetic part and the electrified water flow so as to achieve movement of the water flow.

The present disclosure provides various embodiments of a fastener-driving tool that includes a battery-charged supercapacitor as a power source. The fastener-driving tool includes first and second spaced-apart, conductive rails and a partially conductive piston slidably mounted on the rails. The rails and the piston are electrically connected to one another. The supercapacitor is electrically connected to the first rail. When the supercapacitor discharges electrical current, the electrical current flows from the supercapacitor, into the first rail, through the piston into the second rail, and from the second rail. The electrical current induces magnetic fields in the rails and the piston, and the combination of the electrical current and the magnetic fields induce a Lorentz force that acts on the piston to move the piston toward a nosepiece to drive a fastener.

The invention discloses an inductor noise optimization method based on multi-physics field simulation, and belongs to the technical field of magnetic component simulation design. According to the method, COMSOL software is adopted to customize a solution domain equation to calculate three kinds of electromagnetic force coupling of Lorentz force, Maxwell force and magnetostriction force of the inductor, the coupling is converted into electromagnetic force in a frequency domain through Fourier transform, solid mechanical field simulation is carried out, and magnetostriction generated by an electromagnetic field is coupled to a solid mechanical field in a strain form; calculating the surface acceleration of the inductor in the frequency domain; and then simulating an external sound field of the inductor by taking the surface acceleration of the inductor in the frequency domain as an excitation source of pressure acoustics to obtain a change diagram of the sound pressure level at the noise point to be detected along with the frequency. By the adoption of the method, various electromagnetic forces borne by the inductor can be comprehensively considered, simulation time can be greatly shortened by conducting simulation of the solid mechanical field and the pressure acoustic field in the frequency domain, and therefore noise simulation of the inductor is accurately and efficiently completed.

The invention discloses a preparation method of a high-temperature superconducting wire strip with high strength, high shunt and high heat-conducting property. The method comprises the following steps: 1, cleaning a semi-finished superconducting wire strip; 2, putting the cleaned semi-finished superconducting wire strip serving as a cathode and a copper electrode serving as an anode into copper sulfate electroplating liquid, and connecting with a direct-current power supply to form an electroplating device; and 3, after electroplating the cathode semi-finished superconducting wire strip, taking out the cathode semi-finished superconducting wire strip and staying in the air, and forming an electroplated layer of nano-scale copper grains by a process of repeatedly electroplating and taking out for multiple times, thereby obtaining the high-temperature superconducting wire strip. According to the invention, the surface of the semi-finished superconducting wire strip is plated with the electroplated layer of the nano-scale copper crystal grains through electroplating, and the high-temperature superconducting wire strip has high strength, high shunting and high heat-conducting properties by utilizing the strong pinning characteristic of the nano-copper crystal grains and the intrinsic high electric conductivity and high heat-conducting characteristics of copper, resists Lorentz force in a strong magnetic field, and has the characteristics of high conductivity and high heat conductivity. And the shunting and heat conduction capabilities of the high-temperature superconducting wire strip after quenching are improved, the process is simple, and industrial production is easy.

The invention relates to a simulation analysis method for fluid in an SF6 circuit breaker arc extinguish chamber by introducing electromagnetic thermal influence, and relates to the technical field of simulation analysis for fluid in the circuit breaker arc extinguish chamber. The method comprises the following steps: acquiring a target physical quantity; the target physical quantity is a physical quantity directly related to a control equation of the fluid region; the target physical quantity comprises a Joule calorific value of the high-voltage current and a Lorentz force value generated by the current changing along with time; constructing a fluid simulation model in the arc extinguish chamber according to the target physical quantity; solving the simulation model of the fluid in the arc extinguish chamber based on a real parameter fitting interpolation mode to obtain a simulation analysis result corresponding to the simulation model of the fluid in the arc extinguish chamber; the simulation analysis result is used for evaluating the performance of the SF6 circuit breaker. By adopting the method, the modeling efficiency and the simulation effect can be improved.

The electromagnetic auxiliary casting device for the black metal comprises a casting platform, and a sand mold is arranged on the top face of the casting platform; the casting platform is located in the three-dimensional moving frame; the top end of the three-dimensional moving frame is slidably connected with a mounting seat; the drainage pipe penetrates through the mounting seat and corresponds to the sand mold so as to inject molten metal; the composite electromagnetic stirrer comprises an annular shell, an annular coil winding and a traveling wave coil winding; the annular shell is fixed on the mounting seat and sleeves the outer wall of the drainage tube; the annular coil winding and the traveling wave coil winding are fixed in the annular shell to generate an annular magnetic field and a traveling wave magnetic field respectively; and the junction box is electrically connected with the annular coil winding and the traveling wave coil winding so as to enable the annular coil winding and the traveling wave coil winding to feed simultaneously or separately. Molten metal is drained through the drainage pipe, the traveling wave magnetic field can promote or restrain flowing of the molten metal, the rotating magnetic field generates Lorentz force to drive the molten metal to move, and active control over flowing of the molten metal is achieved.

The purpose of the present invention is to effectively suppress electromagnetic repulsive force acting between a movable element and a stator in an energized state. A contact mechanism (1) according to one embodiment of the present disclosure comprises a first stator (10), a second stator (20), and a movable element (30). The first stator (10) has an excitation unit (12), and the excitation unit (12) has a square ring structure in which a first conductive member (13), a second conductive member (14), a third conductive member (15), and a fourth conductive member (16) are connected in this order. The first conductive member (13) and the third conductive member (15) are configured to overlap the movable element (30) in a plan view. When the contact mechanism (1) is in an energized state, Lorentz force is generated in the movable element (30) in a direction in which the movable element (30) maintains the energized state by a magnetic field generated in the excitation unit (12), suction force due to the Lorentz force is generated between the first conductive member (13) and the movable element (30), and repulsive force due to the Lorentz force is generated between the third conductive member (15) and the movable element (30).

Provided in the present invention are a magnetic resonance guided charged particle beam radiotherapy apparatus and an electromagnetic navigation parameter debugging method for target point coordinates, belonging to the technical field of radiotherapy apparatuses. The present invention comprises a charged particle beam electromagnetic navigation apparatus. The charged particle beam electromagnetic navigation apparatus comprises a multi-stage electromagnetic navigation coil, a charged particle beam sequentially passing through the multi-stage electromagnetic navigation coil to generate a parallel charged particle beam with a direction consistent with the direction of a magnetic resonance main magnetic field; and an MR imaging apparatus, comprising an MR main magnetic field coil upper group and an MR main magnetic field coil lower group, an imaging therapy area being formed therebetween. The electromagnetic navigation parameter debugging method of the present invention comprises constructing a target cost function, optimizing electromagnetic navigation parameters based on a gradient information-free optimization algorithm, and determining and outputting optimal navigation parameters. According to the present invention, the charged particle beam parallel to the MR main magnetic field can be generated, thereby greatly reducing the influence of Lorentz force on the charged particle beam, enabling to reduce the positioning difficulty of the charged particle beam on a tumor target area under MR guidance, and improving the therapeutic accuracy.

The invention provides a magnetic field enhanced SF6 circuit breaker intelligent control method and device. According to the method, waveform feature extraction and spectral analysis are carried out by acquiring arc state parameters, an intelligent decision model is constructed by adopting a hybrid machine learning and reinforcement learning algorithm to generate an optimal arc extinguishing control strategy, and differential control is implemented in different stages of an arc: an electromagnetic coil is activated in the initial stage to generate a high-intensity magnetic field to apply Lorentz force; synergistically adjusting the magnetic field and airflow in the middle stage, and strengthening airflow cooling in the later stage; meanwhile, the medium recovery characteristic is monitored, the reignition probability is calculated in real time, protection measures are triggered, the fault diagnosis function is integrated, intelligent arc extinguishing control over the SF6 circuit breaker is achieved, and the large-current breaking capacity and reliability are remarkably improved.

The invention discloses a swing laser and electromagnetic field stirring composite follow-up welding device and method, and belongs to the technical field of laser welding equipment. The device comprises a laser welding head, a driving device, an electric field generating device, a magnetic field generating device, a base and a water cooling loop. The laser welding head enables laser to act on a welding material to form a molten pool under the control of the driving device, and the electric field and magnetic field device acts on the molten pool. Wherein the electric field device comprises an electric brush with a specific structure and is made of a lightweight material; the magnetic field device forms a magnetic field through coil electrification. According to the welding method, welding materials are fixed to the base, laser is controlled to form a molten pool, and meanwhile an electric field and a magnetic field are changed to improve weld performance. When the purposes of stirring the molten pool and refining crystal grains are achieved, two electric field and magnetic field working modes exist, so that the molten pool is subjected to alternating Lorentz force; in order to improve the weld offset, the direction of the Lorentz force is changed by rotating the electric field device.

The invention relates to a magnetic field control system and method for a curved surface follow-up additive molten pool, and belongs to the technical field of additive manufacturing. The magnetic field control system for the curved surface follow-up additive molten pool comprises an additive module, an angle calculation module and a control module; the material adding module is used for carrying out shape follow-up material adding on the to-be-welded curved surface; the angle calculation module is used for calculating the rotation angle of the material adding module according to the planned curved surface shape follow-up material adding track; and the control module is used for adjusting the material adding module based on the rotation angle to generate a constant magnetic field, obtaining the reverse Lorentz force of the molten pool in the curved surface shape follow-up material adding process based on the constant magnetic field, and hindering flowing of the molten pool based on the reverse Lorentz force, so that the curved surface forming precision is improved.

A system includes a heat-transfer conduit forming a circulating loop with a liquid metal. Heat exchangers are coupled to either end of the circulating loop to transfer heat to and from the liquid metal. A magnetohydrodynamic pump assembly is coupled to the conduit and comprising (i) an electrode configured to generate an electric current density in a first direction, (ii) a magnet configured to generate a magnetic flux density in a second direction perpendicular to the first direction. A resulting Lorentz force between the electrode and the magnet induces motion of the liquid metal in a third direction parallel to the longitudinal axis of the conduit loop. A controller is coupled to the magnetohydrodynamic pump assembly and configured to adjust an electric current applied to the electrode to vary the intensity of the electric current density, which varies a flow rate of the liquid metal.

The invention discloses a lorentz force-based in-pipe nondestructive inspection device and method, the lorentz force-based in-pipe nondestructive inspection device comprises a plurality of connecting rings, a plurality of connecting strips, a plurality of permanent magnet groups and a plurality of coils, the plurality of permanent magnet groups taking the connecting rings and the connecting strips as carriers can be conveniently adjusted so as to adapt to pipelines of different materials and specifications, and when in use, the permanent magnet groups can be conveniently adjusted so as to adapt to the pipelines of different materials and specifications. After the coil is electrified with alternating current through the signal output module, an alternating vortex field is conveniently induced on the skin depth inner surface of the to-be-detected pipeline, so that shear force along the tangential direction can be generated in the to-be-detected pipeline and is spread in the to-be-detected pipeline, and then torsional mode guided waves are stimulated; the torsional mode guided wave is propagated along the axis direction of the to-be-detected pipeline and is reflected after encountering a pipe wall defect, the reflected echo enters the signal detection module through the coil, and through the arrangement, an array type periodic permanent magnet technology can be formed in a high-adaptability mode, so that the defects in the prior art are overcome, and the detection accuracy is improved. And the detection precision is improved on the premise of not depending on pipe wall conditions.

The invention belongs to the technical field of micro-electro-mechanical systems (MEMS) and the technical field of electric field / magnetic field detection, and particularly provides an electric field-magnetic field composite integrated resonant MEMS sensor which is used for solving the problem that a traditional resonant MEMS sensor can only sense a single environment parameter. According to the electric field-magnetic field composite integrated resonant MEMS sensor provided by the invention, accurate measurement of a direct-current electric field in a space thickness direction (Z axis) is realized by using an out-of-plane flapping mode of a disc resonant sensing unit fixed by four T-shaped anchor points; the measurement of an out-plane Z-axis magnetic field and an in-plane X-axis magnetic field is realized through the effect of Lorentz force on a metal wire loop which is arranged on the surface of the disc resonance sensing unit and is charged with alternating current in the magnetic field; therefore, the composite integrated sensing of two parameters of an electric field and a magnetic field by the same device is realized, and the number of required sensors and the occupied area of a chip are reduced.

The invention relates to an N-pole module assembly of a circuit breaker and the circuit breaker. The N-pole module assembly of the circuit breaker comprises a main body function module and a current detection module, and further comprises a first N-pole conductive plate fixedly integrated on the main body function module and a second N-pole conductive plate fixedly integrated on the current detection module, and the main body function module and the current detection module are respectively two independent modular structures. And the first N-pole current-conducting plate and the second N-pole current-conducting plate are fixedly and electrically connected to form an N-pole electric loop. According to the invention, the complicated bending and wiring process of the soft wire in the N-pole module assembly in the prior art is avoided, the assembly is convenient, and the automatic assembly can be realized. Moreover, through the special arrangement of the relative positions of the N-pole electric loop and the L-pole electric loop, the Lorentz force generated by the magnetic field generated by the current on the N-pole electric loop on the electric arc in the circuit breaker unit can assist the electric arc to be further pushed and lengthened, and the effect of enhancing the magnetic quenching function can be achieved.

The present invention relates to a method and system for designing a magnet using an induced current, which includes: determining the field type of an external magnetic field and the coil distribution profile according to physical requirements, and determining the conductor shell shape according to the coil distribution profile; calculating the eddy current distribution generated by the conductor shell under the external magnetic field, and obtaining a preliminary discrete coil distribution after discretizing the eddy current distribution; parameter modeling of the discretized coil position, adjusting the coil distribution, and optimizing the magnetic field at the coil end; converting the magnetic field and current distribution data on the optimized coil into a Lorentz force distribution and loading it into a finite element model for structural simulation, and mechanically designing the coil skeleton and the magnet structure according to the simulation results, and after the structural design of the cold body is completed, designing a cryostat from the inside out. The present invention has no special restrictions on the field shape and the coil cross-sectional distribution, has extremely high flexibility, can cope with the design requirements of various complex magnetic field systems, and can be applied in the field of magnet optimization design technology.

The utility model relates to a plasma reaction chamber structure and a plasma machine table, and the plasma reaction chamber structure is provided with a chamber body, a reaction chamber is arranged in the chamber body, an induction coil is located on the chamber body and is used for generating an electric field for gas ionization, an injection structure is fixed on the chamber wall of the reaction chamber and is used for injecting gas into the reaction chamber, and a suction cup is arranged in the reaction chamber. The first magnetic assembly is used for placing a wafer to be reacted, and the first magnetic assembly is arranged on the cavity wall of the reaction cavity and used for generating a magnetic field to change the movement direction of particles in the plasma in the reaction cavity. Since particles in the plasma are charged ions, the first magnetic assembly is arranged to generate a magnetic field, the charged ions change the movement direction under the action of Lorentz force in the magnetic field, the condition that the charged ions collide with the cavity wall of the reaction cavity, the cavity wall is etched to generate metal particles is avoided, the metal content in the reaction cavity is reduced, and the reaction efficiency is improved. And failure of the prepared device is avoided.

The invention provides a magnetic resonance guided charged particle beam radiotherapy device and an electromagnetic navigation parameter debugging method for target coordinates, and belongs to the technical field of radiotherapy devices. The system comprises a charged particle beam electromagnetic navigation device which comprises multiple stages of electromagnetic navigation coils, charged particle beams sequentially pass through the multiple stages of electromagnetic navigation coils, and parallel charged particle beams consistent with a magnetic resonance main magnetic field in direction are generated; the MR imaging device comprises an MR main magnetic field coil upper group and an MR main magnetic field coil lower group, and an imaging treatment area is formed between the MR main magnetic field coil upper group and the MR main magnetic field coil lower group. The electromagnetic navigation parameter debugging method comprises the steps of constructing a target cost function, optimizing electromagnetic navigation parameters based on an optimization algorithm without gradient information, and determining and outputting optimal navigation parameters. According to the invention, the charged particle beam parallel to the MR main magnetic field can be generated, the influence of Lorentz force on the charged particle beam is greatly reduced, the difficulty of positioning a tumor target region by the charged particle beam under the guidance of MR can be reduced, and the treatment accuracy is improved.