7 results about "Electron cyclotron resonance" patented technology

The application provides a microwave electron gun, a method for generating an electron cyclotron resonance region and an ion implanter, wherein the microwave electron gun comprises: a plasma chamber; the plasma chamber has a first end and a second end; the first end is used for passing in microwaves; the second end is used for passing in gas; an escape region is arranged on the sidewall of the plasma chamber, and the particle escape efficiency of the escape region gradually decreases from the first end to the second end, wherein the particles include electrons and / or gas molecules / atoms. The microwave electron gun provided by the technical scheme reduces the leakage degree of the gas in the plasma chamber and improves the working performance of the microwave electron gun.

The application discloses a DC bus voltage quick recovery control method for a high-voltage power supply module of an ECRH (Electron Cyclotron Resonance Heating) fusion device, and relates to the technical fields of auxiliary heating power supply and power electronic control. Specifically, the method comprises the following steps: obtaining a real-time sampling value of a DC bus voltage, a DC side current sampling value and a grid voltage d-axis component; outputting an active current reference component through a PI regulator according to a voltage deviation; generating a feedforward active current component according to a power balance relationship and superimposing the two to obtain a synthesized d-axis current instruction value as a current inner loop given value. The purpose is to lift the current instruction in advance when a load step occurs, realize quick power matching, reduce the DC bus voltage drop and shorten the recovery time.

The application discloses a gyrotron integrated test analysis method, and belongs to the field of high-power microwave device testing. The method designs a steady-state working condition debugging starting point according to a starting current curve; and combines experimental power measurement data to correct a simulated power characteristic surface. The method provided by the application combines theoretical simulation with experimental data, realizes rapid identification and optimization of gyrotron working characteristics, improves debugging efficiency and precision, and is suitable for engineering debugging and operation optimization of an electron cyclotron resonance heating system. The method has the advantages of process standardization, high safety and strong migration, and can improve debugging efficiency, enhance calibration precision and reliability.

The present application relates to the technical field of magnetic confinement nuclear fusion, and discloses an electron cyclotron resonance heating system transmission state monitoring device and method, wherein the transmission state monitoring device comprises a waveguide switching switch, a microwave full-absorption water load, a directional coupler, a power measuring device and a detector, wherein the microwave full-absorption water load is used for calibrating the directional coupler, and the microwave power passing through the corresponding transmission waveguide can be obtained through the detector integrated on the directional coupler; the transmission efficiency of different transmission sections and the whole transmission system can be obtained through the microwave power measured at different positions of the transmission waveguide; the power measuring device is arranged at a target position, and the transmission efficiency of the whole transmission system can be obtained through the proportion of the target position absorption power and the passing power; and the final transmission efficiency of the transmission system is determined through mutual checking. The present application can obtain the transmission efficiency of the transmission system on line, monitor the transmission state of different transmission sections on line and accurately determine the fault occurrence point.

The present invention relates to a device 100 for reflecting microwave radiation during electron- cyclotron resonance heating (ECRH). The device 100 comprises a bulk portion 200 and at least one reflective layer 300a, 300b, 300c, wherein the bulk portion 200 includes dielectric material and the at least one reflective layer 300a, 300b, 300c is made of an electrically conductive material which has an electrical conductivity in a range of 0.1 - 70 MS / m, and wherein the thermal expansion coefficient of the bulk portion 200 differs from the thermal expansion coefficient of the at least one reflective layer 300a, 300b, 300c by an amount in a range of 0 - 20x10-6 / K, and wherein a cooling means 400a, 400b, 400c is provided at or at least partially within the bulk portion 200.

This invention belongs to the field of neoclassical tearing mode suppression technology and discloses a method for suppressing neoclassical tearing modes. This invention employs an external resonant perturbation field to mode-lock the neoclassical tearing mode magnetic island, and then applies electron cyclotron resonance heating inside the magnetic island to change the local resistivity within the neoclassical tearing mode magnetic island, thereby suppressing the neoclassical tearing mode. Compared to the high power required by traditional electron cyclotron current-driven techniques, this technique indirectly modulates the current profile through thermal effects, significantly reducing the total power requirement. After mode-locking, the position of the magnetic island is relatively fixed, reducing the impact of neoclassical tearing mode magnetic island rotation and random displacement on the suppression effect. Resistivity modulation is achieved through heating, which may produce a smoother current profile correction, reducing the instability risk caused by local current spikes resulting from current driving.

Provided are a discharge and modulation system and method for a microwave-radio frequency (RF) mixed coupled plasma, which relate to the technical field of ion beam processing. A gas distributor delivers a process gas separately to an Electron Cyclotron Resonance (ECR) region and an RF-enhanced discharge chamber. A power of a microwave antenna is adjusted to enable the process gas in the ECR region to form an initial plasma. A voltage of an electron extraction grid is adjusted to extract an electron from the initial plasma into the RF-enhanced discharge chamber. An RF power supply loads an RF voltage onto an RF coil, such that the electron collides with the process gas in the RF-enhanced discharge chamber, thereby forming a high-density plasma. An ion extraction grid is adjusted to enable an ion within the high-density plasma to form an ion beam current.