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Apparatus for measuring entrance phase position of Tokamak low-noise-wave antenna array and phase-appraising method

A tokamak and low clutter technology is applied in the field of devices for measuring the entrance phase of the tokamak low clutter phase-controlled multi-junction waveguide array antenna, achieving the effect of reliable technical guarantee

Inactive Publication Date: 2007-03-28
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Accurate and high-speed measurement of entrance phase of tokamak low-clutter antenna by quadrature detection method

Method used

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  • Apparatus for measuring entrance phase position of Tokamak low-noise-wave antenna array and phase-appraising method
  • Apparatus for measuring entrance phase position of Tokamak low-noise-wave antenna array and phase-appraising method
  • Apparatus for measuring entrance phase position of Tokamak low-noise-wave antenna array and phase-appraising method

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Embodiment Construction

[0022] The EAST tokamak low clutter system includes 20 2.45GHz klystrons, and a dual directional coupler is connected to the waveguide transmission line near the output port of each klystron and the waveguide transmission line near the low clutter antenna (total 40). The tokamak low clutter antenna array entrance phase measurement device is composed of four main parts: a DC blocking filter, a 1*4PIN switch, a two-power divider, and a phase detection module. In order to simplify the complexity of the device, under the feedback control speed allowed by the system, 20 klystrons are divided into 5 groups, 4 in each group, and the channel is switched by 1×4 PIN switch.

[0023] The microwave signal output by each dual directional coupler is connected to 1×4PIN switch through a DC blocking filter for channel switching (a total of 20 microwave signals output by dual directional coupler are connected to 5 1×4PIN switches after passing through the DC blocking filter ). The output end...

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Abstract

The invention discloses a phase-measuring device and identification method to entrance Tokamak low clutter antenna phase. That is to connect a dual directional coupler respectively at the root of every klystron output waveguide transmission line and near the antenna. Each dual directional coupler microwave signal is separated into two parts through filter and two straight power splitters respectively access Module A, B input. Phase two modules used to work, A module will phase output phase voltage curves of the same phase of the two phase corresponding phase combined output phase voltage module B identify a phase value. The invention measures and phases out amount of regulation quickly and accurately when Tokamak system sends the 2.45 GHz microwave signal to antenna phase entrance, provides accurate feedback phase of the phase control, provide a reliable technical support for studying microwave plasma coupling efficiency.

Description

technical field [0001] The invention relates to a device and a phase identification method for measuring the entrance phase of a Tokamak low-clutter phase-controlled multi-junction waveguide array antenna. Background technique [0002] Low clutter current drive is an important heating method in tokamak experiments. Most of the low-clutter current-driven experiments use phase-controlled multi-junction waveguide array antennas. The phase difference between the antenna’s main waveguides is adjusted through the phase feedback control system to change the microwave power spectrum, which can provide a power spectrum that meets the specific experimental requirements for the tokamak experiment. In order to study the interaction of microwave and plasma in depth. [0003] The EAST low clutter antenna adopts the phase multi-junction waveguide array antenna (Phase Multi-junction Grill Antenna) structure. A combination of fixed phase and variable phase is used. After the 20 main waveg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R25/00H05H1/02G21K1/00H04L25/02H01P5/00H03L7/00
Inventor 徐辉单家芳
Owner INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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