CN-121878277-B - Radio frequency resonant cavity based on short-circuit slider

CN121878277BCN 121878277 BCN121878277 BCN 121878277BCN-121878277-B

Abstract

The application relates to a radio frequency resonant cavity based on a short-circuit slide block, which comprises an input coaxial transmission line, a connector connected with the input coaxial transmission line, a first output coaxial transmission line and a second output coaxial transmission line both connected with the connector, a first shifting mechanism arranged on the first output coaxial transmission line and a second shifting mechanism arranged on the second output coaxial transmission line, wherein the first output coaxial transmission line and the second output coaxial transmission line both comprise an inner conductor, a short-circuit slide block and an outer conductor, the outer conductor is coaxially sleeved outside the inner conductor, a coaxial cavity is formed between the outer conductor and the inner conductor in a matched mode, the short-circuit slide block is connected with the first shifting mechanism and the second shifting mechanism, and the short-circuit slide block is movably arranged in the coaxial cavity. The effect of obtaining very large voltage by means of very small power is achieved, possible ignition points can be detected under the working condition of large voltage, measures are taken in advance to prevent the ignition phenomenon, and the stable operation of the ion cyclotron power transmission system is ensured.

Inventors

QIN CHENGMING
ZHANG ZIAN
LIU LUNAN

Assignees

中国科学院合肥物质科学研究院
聚变新能(安徽)有限公司

Dates

Publication Date: 20260512
Application Date: 20260320

Claims (9)

1. A radio frequency resonant cavity based on a shorting slider, comprising: An input coaxial transmission line; a connector connected to the input coaxial transmission line; A first output coaxial transmission line and a second output coaxial transmission line, both of which are connected with the connector; The first shifting mechanism is arranged on the first output coaxial transmission line, and the second shifting mechanism is arranged on the second output coaxial transmission line; The first output coaxial transmission line and the second output coaxial transmission line comprise an inner conductor, a short-circuit sliding block and an outer conductor, the outer conductor is coaxially sleeved outside the inner conductor, a coaxial cavity is formed between the outer conductor and the inner conductor in a matched mode, the short-circuit sliding block is connected with the first displacement mechanism and the second displacement mechanism, and the short-circuit sliding block is movably arranged in the coaxial cavity; The short-circuit sliding block is of an annular structure, a first grain structure is formed on the outer annular wall of part of the short-circuit sliding block in a protruding mode, and the first grain structure is in sliding contact with the outer conductor.
2. The short-circuit slider-based radio frequency resonant cavity of claim 1, wherein the connector is a T-connector having a first interface connected to one end of the input coaxial transmission line, a second interface connected to one end of the first output coaxial transmission line, and a third interface connected to one end of the second output coaxial transmission line.
3. The shorting slider based radio frequency resonator of claim 1 wherein the first output coaxial transmission line and the second output coaxial transmission line are symmetrically spaced side-by-side.
4. The shorting slider based radio frequency resonator of claim 3 wherein the first output coaxial transmission line and the second output coaxial transmission line each comprise a horizontal section transmission line and a vertical section transmission line connected, the horizontal section transmission line being connected to the connector, the vertical section transmission line being connected to an end of the horizontal section transmission line remote from the connector; the short-circuit sliding block is arranged in the vertical section transmission line in a lifting and moving mode.
5. The shorting slider-based radio frequency resonator of claim 1 wherein a portion of the inner annular wall of the shorting slider has a second textured structure protruding therefrom, the second textured structure being in sliding contact with the inner conductor.
6. The shorting slider based radio frequency resonator of claim 1 further comprising a voltage detector disposed in the first output coaxial transmission line and the second output coaxial transmission line.
7. The short-circuit slider-based radio frequency resonant cavity of claim 1, wherein the first displacement mechanism and the second displacement mechanism each comprise a power source, a mounting seat, a bracket and a lifting piece, the mounting seat is arranged on the first output coaxial transmission line and the second output coaxial transmission line through the bracket, the power source is arranged on the mounting seat, and an output end of the power source is connected with the short-circuit slider through the lifting piece.
8. The radio frequency resonant cavity based on the short-circuit sliding block according to claim 7, wherein the support comprises at least two support rods, at least two support rods are arranged at intervals along the circumferential direction, and a hollow groove is formed between every two adjacent support rods.
9. The short-circuit slider-based radio frequency resonant cavity of claim 4, further comprising a data processor, a thermal imager and a thermocouple, wherein the thermocouple is mounted on the vertical section transmission line and is electrically connected with the data processor, and a lens of the thermal imager is disposed opposite to the vertical section transmission line.

Description

Radio frequency resonant cavity based on short-circuit slider Technical Field The application relates to the technical field of detection of an ion cyclotron heating system, in particular to a radio frequency resonant cavity based on a short-circuit slider. Background For central heating of fusion reactors, ion cyclotron radio frequency heating (ICRH) is the method of choice in the industry. However, to achieve this target of ion temperature required for fusion, ion cyclotron power of several tens megawatts is continuously injected into the plasma, which makes the load carrying capacity of the ion cyclotron power transmission system a great challenge. And then a potential safety hazard is brought, namely, the voltage of the transmission line under the high-power working condition is too high, and the microwave element is ignited due to the too high voltage of the transmission line, so that the potential safety hazard is caused, and the working reliability of the ion cyclotron power transmission system is affected. Disclosure of Invention Based on the above, it is necessary to provide a radio frequency resonant cavity based on a short-circuit slider aiming at the problem that the microwave element is ignited due to the too high voltage of the transmission line in the conventional technology, and the working reliability of the ion cyclotron power transmission system is affected. The application provides a radio frequency resonant cavity based on a short-circuit slider, which comprises: An input coaxial transmission line; a connector connected to the input coaxial transmission line; A first output coaxial transmission line and a second output coaxial transmission line, both of which are connected with the connector; The first shifting mechanism is arranged on the first output coaxial transmission line, and the second shifting mechanism is arranged on the second output coaxial transmission line; The first output coaxial transmission line and the second output coaxial transmission line comprise an inner conductor, a short-circuit sliding block and an outer conductor, the outer conductor is coaxially sleeved outside the inner conductor, a coaxial cavity is formed between the outer conductor and the inner conductor in a matched mode, the short-circuit sliding block is connected with the first displacement mechanism and the second displacement mechanism, and the short-circuit sliding block is movably arranged in the coaxial cavity. The radio frequency resonant cavity based on the short-circuit sliding block is applied to a test scene that a microwave element can bear a high voltage limit value under the condition of not generating a sparking phenomenon under high current and high voltage in advance, particularly, very small input power is loaded onto an input coaxial transmission line during test, so that the power can be equally distributed into a first output coaxial transmission line and a second output coaxial transmission line through a connector, the short-circuit sliding block is driven to move between an inner conductor and an outer conductor by means of a first shifting mechanism and a second shifting mechanism, the position of a short-circuit point between the inner conductor and the outer conductor can be flexibly changed, the real part and the imaginary part of impedance on the first output coaxial transmission line and the second output coaxial transmission line are changed, the regulation of the branch length is realized, the voltage of the transmission line is increased by reducing the input impedance, the effect of very large voltage is realized by means of very small power, the possible sparking point can be detected under the working condition of the high voltage, further measures are taken to prevent the occurrence of the sparking phenomenon in advance, and the ion cyclotron power transmission system is ensured to stably run under high power long pulse. The technical scheme of the application is further described as follows: In one embodiment, the connector is a T-connector, the T-connector has a first interface, a second interface, and a third interface, the first interface is connected to one end of the input coaxial transmission line, the second interface is connected to one end of the first output coaxial transmission line, and the third interface is connected to one end of the second output coaxial transmission line. In one embodiment, the first output coaxial transmission line and the second output coaxial transmission line are symmetrically arranged at intervals side by side. In one embodiment, the first output coaxial transmission line and the second output coaxial transmission line each comprise a horizontal segment transmission line and a vertical segment transmission line which are connected, wherein the horizontal segment transmission line is connected with the connector, and the vertical segment transmission line is connected with one end of the horizontal segment transmission line f