Terahertz microwave interference array for measuring two-dimensional electron density profile based on time delay method

Abstract

The invention belongs to the field of magnetic confinement controlled nuclear fusion plasma diagnosis, and relates to a terahertz microwave interference array for measuring a two-dimensional electron density profile based on a time delay method, which is an important technical method for measuring the electron density of magnetic confinement plasma. An adopted device mainly comprises a crystal oscillator, a six-centimeter device, a dot frequency source, a terahertz frequency multiplier, an integrated unit composed of a two-centimeter device, a programmable microwave switch, a frequency mixer, an amplifier, a detector and a central processing unit, a microwave waveguide, a terahertz phased array antenna and the central processing unit. According to the array disclosed by the invention, time-sharing measurement of a plurality of spatial positions can be realized by arranging a plurality of terahertz phased array antennas capable of flexibly adjusting emission angles and a programmable microwave switch in a magnetic confinement fusion device, and then a two-dimensional measurement electron density profile is obtained by utilizing a fast numerical inversion algorithm; and the time delay method is especially suitable for large-scale magnetic confinement fusion devices in the future.

Description

technical field [0001] The invention belongs to the field of magnetic confinement controlled nuclear fusion plasma diagnosis, and relates to a terahertz microwave interference array for measuring two-dimensional electron density profiles based on a time delay method, which is an important technology for measuring plasma electron density in future large magnetic confinement fusion devices . Background technique [0002] Magnetic confinement fusion is widely regarded as one of the most promising and feasible ways to fundamentally solve energy problems. Scientific research shows that when the plasma temperature T, electron density n e and can reduce the constraint time τ E Only when the triple integral of α satisfies the threshold condition (different types of plasma reactions have different thresholds) can the fusion reaction output energy and be stable and self-sustaining. Therefore, the electron density n e It is one of the three basic parameters that fusion engineering ...

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Problems solved by technology

However, in large-scale devices, different physical events may occur in different spaces, resulting in different responses of local electron density, which requires diagnostics to provide data information in different spaces

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