Polar fast electron measurement probe system suitable for magnetic confinement plasma

Abstract

The invention discloses a polar fast electron measurement probe system suitable for magnetic confinement plasma. The polar fast electron measurement probe system comprises an insulating shell, fast electron probe assemblies, a Langmuir probe assembly, a ceramic base and a graphite shell. The insulating shell is made of high-temperature-resistant boron nitride, and the ceramic base is made of machinable ceramic. The probe assembly comprises a graphite probe, a copper binding post, a wire and other components, the graphite probe is in threaded connection with the copper binding post, and the copper binding post is in tin soldering connection with the wire or is in press connection with the wire through crimping pliers. The fast electron probes are uniformly and symmetrically distributed in the polar direction, and fast electron components from different directions can be measured. The graphite probes of the fast electron probes are located in the small holes and are applied with positivebias voltage. The radius of the electron Larmor in the magnetic confinement plasma is far less than that of ions, the ions can be effectively repelled by setting the diameter and the depth of the small hole so as to collect electrons. The system can work in the high-temperature environment in the magnetic confinement fusion device, and is stable in mechanical performance, reliable in signal, highin spatial resolution and small in occupied space.

Description

technical field [0001] The invention relates to the field of magnetically confined plasma diagnosis, in particular to a polar fast electron measuring probe system suitable for magnetically confined plasma. Background technique [0002] Magnetically confined plasma uses a special form of magnetic field to confine quasi-neutral plasma in a specific space, and is mainly used in the fields of magnetically confined fusion and plasma engines. Magnetic confinement fusion usually uses coils to generate a three-dimensional magnetic field structure, confines the plasma composed of ions and electrons inside the container for a long time, and increases the temperature of the plasma in the container through heating methods such as microwave and high-energy neutral particle injection, so that It's high enough that nuclear fusion reactions can take place, releasing energy through Einstein's mass-energy equation, which can be used to generate electricity. The future magnetic confinement fu...

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Problems solved by technology

In the tokamak, there are often strong instability phenomena, such as boundary localized modes, etc., during the explosion period, a large number of particles and energy in the core plasma will be transported to the boundary plasma, and hit the first part of the device. On the one hand, this will pose a serious threat to the safety and life of the material

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