An e×b probe

Abstract

The invention provides an E×B probe, which includes an ion filter collimation module, a connector, a collimation cylinder and an E×B velocity filter module; the ion filter collimation module includes an ion filter device housing, an ion filter inlet collimator The device, the insulating plate cover, the insulating plate and the arc electrode, the insulating plate is fixed in the middle of the shell of the ion filter device, the arc electrode is closely attached to the insulating plate, the insulating plate cover is placed on the arc electrode; the ion filter entrance is aligned The device is placed at the ion filter inlet of the ion filter device housing; the connector is fixed at the ion filter outlet of the ion filter device housing, and the front end of the collimation cylinder passes through the connector and extends into the ion filter device housing to meet the arc shape The electrodes are close, and the rear end of the collimation cylinder is placed in the E×B velocity filter module. The E×B probe of the present invention adopts arc-shaped electrodes, a collimated magnetic shield and an exit collimated magnetic shield, which improves the resolution of the E×B probe and reduces the impurity content in the result.

Description

technical field [0001] The invention relates to the technical field of plasma measurement, in particular to a novel E×B probe, especially a high-precision E×B probe, which is used for measuring ion distribution and application in plasma. Background technique [0002] Space missions are high-risk, high-difficulty, and high-cost activities. The pursuit of low cost and high efficiency promotes the vigorous development of space propulsion systems. In chemical propulsion with relatively mature technology, solid propulsion has the advantage of large thrust, but it cannot be started multiple times; in liquid propulsion, bicomponent liquid propulsion can generate high specific impulse, but the technology is complex and expensive. The current near-Earth space missions and deep space exploration missions put forward higher requirements on the space propulsion system. Electric propulsion is a propulsion technology that utilizes electric energy to ionize and accelerate working fluid in...

AI Technical Summary

Problems solved by technology

The traditional E×B probe can measure better results in the small angle range of the plume center, and a large amount of impurities will affect the measurement results if the angle deviates slightly from the plume centerline. Therefore, the E×B probe is usually used to measure the average Measured near the center of the plume

At the same time, because the number of ions finally received by E×B probes is too small, some E×B probes increase the number of ions that can be collected at the cost of reducing the probe resolution.

The traditional E×B probe uses a permanent magnet with strong magnetism to provide a fixed magnetic field, which has the problem that the magnetic field distribution is not uniform and makes it difficult to measure. Although the method of using an electromagnet instead of a permanent magnet can make the magnetic field relatively stable and controllable, However, the space required to achieve the same field strength level as that of permanent magnets is too large, which limits its application space

[0005] To sum up, the traditional E×B probe has the following points to be improved: (1) The entrance collimation cylinder structure is adopted, and the range of plume receiving by the short entrance collimation cylinder is too large. There are too many impurities; the number of ions received by the long-entrance collimation cylinder is too small, and accurate detection results cannot be obtained

(2) The permanent magnet device is used, and the uneven distribution of the magnetic field edge is not easy to measure

The E×B probe has uneven magnetic field distribution, and there are a lot of impurities that affect the measurement results

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