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Three-unit magnetic quadrupole lens system and manufacturing method thereof

A magnetic quadrupole lens and lens system technology, applied in nuclear engineering, radiation/particle processing, etc., can solve the problem that the sealing effect is difficult to meet the needs of high vacuum or ultra-high vacuum, achieve good focusing effect, reduce Distortion, easy processing effect

Inactive Publication Date: 2015-08-19
PEKING UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the seal shaft seal structure between the two-body beam transport pipeline passing through the center of the quadrupole lens group often has a sealing effect that cannot meet the requirements of the beam transport system for high vacuum or ultra-high vacuum.

Method used

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  • Three-unit magnetic quadrupole lens system and manufacturing method thereof
  • Three-unit magnetic quadrupole lens system and manufacturing method thereof
  • Three-unit magnetic quadrupole lens system and manufacturing method thereof

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Embodiment Construction

[0036] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.

[0037] Such as figure 1 As shown, the three-unit magnetic quadrupole lens system in this embodiment includes: a three-unit magnetic quadrupole lens group 1 composed of three lens units; and a beam transport pipe 2 passing through the center of the lens group.

[0038] Such as figure 2 As shown, each lens unit includes: a magnetic yoke 11 forming a magnetic circuit, four magnetic poles 12 whose magnetic pole faces are strictly hyperbolic cylindrical, and each magnetic pole is wound with an excitation coil 13 for generating a focusing magnetic field. And the circumference of the top of the hyperbolic cylindrical magnetic pole surface of the four magnetic poles is called the central through hole 14 of the lens unit, and the distance between two adjacent magnetic pole surface processing breakpoints in the lens unit is 2S d = 10 mm.

[0039] Such...

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Abstract

The invention discloses a three-unit magnetic quadrupole lens system and a manufacturing method thereof. The three-unit magnetic quadrupole lens system comprises a three-unit magnetic quadrupole lens group formed by three lens units and a beam current transport pipeline passing through the center of the lens group. The beam current transport pipeline adopts an end sealing structure, and comprises a lens pipeline main body, a retainer ring flange, a retainer ring, an O-type sealing ring and an active flange. A dual-curve cylindrical surface-shaped magnetic pole surface is adopted, a magnetic equipotential surface of the quadrupole magnetic field is closer to the shape of dual curve, an ion beam can be easily debugged, and good focusing effects can be obtained. As a dual-curve cylindrical surface-shaped magnetic pole surface processing equation and magnetic pole surface breaking point coordinates are given, a numerical control machine tool can be used for extremely easily processing the dual-curve cylindrical surface-shaped magnetic pole surface precisely. The three-unit lens group enables debugging of the beam current to be more symmetrically. Vacuum sealing between the lens pipeline main body and the active flange is the end sealing, and the transport pipe has better vacuum sealing effects.

Description

technical field [0001] The invention relates to a high-energy ion beam magnetic lens focusing device, in particular to a three-unit magnetic quadrupole lens system and a preparation method thereof. Background technique [0002] In the beam delivery system of an accelerator, a quadrupole lens is the most commonly used focusing element. Especially the magnetic quadrupole lens, which is characterized by the ability to generate a constant gradient of the magnetic field, the farther away from the center point, the stronger the focusing power. Because of its strong focusing ability, it is very suitable for focusing high-energy ion beams generated by megavolt accelerators, so the magnetic quadrupole lens has almost become a general-purpose device in the beam transport system. [0003] When designing and manufacturing a magnetic quadrupole lens, in order to make the magnetic equipotential surface in the generated quadrupole field as close as possible to an orthogonal hyperboloid, i...

Claims

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Application Information

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IPC IPC(8): G21K1/093
CPCG21K1/093
Inventor 任晓堂
Owner PEKING UNIV
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