Annular quadrupole permanent magnet ring cutting field magnetic circuit structure for ion thruster

• Main Authors: ZHAO YIDE, ZHANG TIANPING, LI JUAN, GU ZUO, JIANG HAOCHENG, YANG FUQUAN
• Format: Patent
• Language: English
• Published: 23.12.2015
• Subjects: BASIC ELECTRIC ELEMENTS; BLASTING; ELECTRICITY; HEATING; INDUCTANCES; LIGHTING; MACHINES OR ENGINES FOR LIQUIDS; MAGNETS; MECHANICAL ENGINEERING; OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR; PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDEDFOR; PRODUCING MECHANICAL POWER; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; WEAPONS; WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS

The invention discloses an annular quadrupole permanent magnet ring cutting field magnetic circuit structure for an ion thruster. A bottom-end magnetic pole and the ion thruster are coaxially fixed to a position near the cathode of the ion thruster. A conical-section magnetic pole and the ion thruster are coaxially fixed to a position near the middle of a conical section of the anode of the ion thruster. A straight-section magnetic pole and the ion thruster are coaxially fixed to a position near the middle of a straight section of the anode of the iron thruster. An outlet-end magnetic pole and the ion thruster are coaxially fixed to a position near the grid electrode of the ion thruster. The polarities of two adjacent magnetic poles in a discharge chamber of the ion thruster and on the surface of the anode are opposite to each other. Through the optimized design of the magnetic field intensity and positions of all the magnetic poles, a magnetic field is limited in a quite narrow scope through a quadrupole ring cutting field formed by the magnetic circuit structure, most areas of the whole discharge chamber are approximately field-free areas, and particularly, most areas near the shield grid electrode are approximately field-free areas; the annular quadrupole permanent magnet ring cutting field magnetic circuit structure has the advantages that the discharging efficiency is high, the straightness of beams is good, and the magnetic induction intensity of required permanent magnets is weak.