JPH0481700A - Charged particle device - Google Patents

Abstract

PURPOSE:To attain regulation of a beam parameter motor with a less expensive structure by providing additionally a drive mechanism to a guadrupole electromagnet, so that the motor may rotate around a beam axis as a rotation center thereof. CONSTITUTION:By actuating a step motor 5, a gear 6 rotates and a gear 7 supported by a support frame 8, rotates, too. The gear 7 supports a quadrupole electromagnet 1 and therefore magnetic field prepared by the four-pole electromagnet 1 is to rotate around a beam duct 4 as a rotation center thereof. In order to make converging and diverging power along x- and y-directions of the beam, and the degree of coupling of the emittances along x- and y-directions, that is to say, by determining the rotational angle arbitrary values and the magnitude of the field of the quadrupole magnet in order to give to the ratio of cross-sectional sizes of the beam along x- and y-directions, the ratio of cross- sectional sizes of the beam can be changed freely.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a charged particle device for transporting, accelerating, decelerating and accumulating a beam of charged particles, such as electrons or ions.

[Prior art] Conventionally, this type of charged particle device has been described in "Design of UV SOR storage ring" published by Institute of Molecular Science.
UV5OR-9 (December 1982: Written by Tamotsukaru.

Figure 5 is a cross-sectional view of a conventional quadrupole electromagnet (1), Figure 6 is a cross-sectional view of a skew electromagnet (2), and (3).
(4) is a beam duct through which charged particles pass. FIG. 7 shows an example in which these are incorporated into a part of a storage ring.

Next, the operation will be explained. A bundle (beam) of charged particles passing through the beam duct 1-(4) is moved by a 4ri1 electromagnet (
The magnetic field created by 1) receives convergence and divergence forces in the X direction and In the storage ring, the direction perpendicular to the beam traveling direction within the beam deflection plane; the X direction is the direction perpendicular to the beam traveling direction and the X direction). On the other hand, skew 4N
The electromagnet (2) is equivalent to the quadrupole electromagnet (1) rotated by 45 degrees around the beam axis, and the degree of coupling between the X-direction and the X-direction emittance in the storage ring etc. is adjusted by the magnetic field it creates. As a result, it is used to control the ratio of the size in the X direction to the size in the X direction of the beam shape.

[Problems to be Solved by the Invention] In the conventional charged particle device as described above, the quadrupole electromagnet and the skew 48it magnet were fixed with respect to the beam axis, so the size of the beam shape in the X direction and the In order to control the ratio of
Pole electromagnets had to be used, which not only increased the number of electromagnets and the power supplies required for them, but also made it difficult to maintain space in the direction of the beam trajectory.

This invention was made in order to eliminate the above-mentioned open points, and in addition to constructing a system that saves the number of magnets and power supplies, it also allows for the construction of a system that saves on the number of magnets and power supplies, as well as the The object of the present invention is to obtain a charged particle device that allows the ratio between the direction and the size in the X direction to be arbitrarily changed.

[Means for Solving the Problems] A charged particle device according to the present invention is such that a 54-pole electromagnet is provided with a drive device that can rotate around a beam axis, and its rotation angle can be adjusted.

[Function] In the present invention, the quadrupole electromagnet is configured to change the direction of the generated quadrupole magnetic field to any direction in a plane perpendicular to the beam axis using a drive device that can rotate the quadrupole electromagnet by an arbitrary angle around the beam axis. can be taken. Therefore, by controlling the rotation angle around the beam axis and the strength of the quadrupole magnetic field, the beam
Not only the direction of convergence and divergence in the X direction, but also the ratio of the beam cross-sectional shape in the X direction and the X direction can be changed arbitrarily.

Second Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, (1) is a 4-pole electromagnet, (4) is a heat-1,
Duct (5) is a stepping motor, (6) is a gear attached to the shaft of this motor, and (7) is a beam duct (
4) is a gear that rotates around the central axis, and is a quadrupole electromagnet (
1) is supported. (8) is a support frame that allows the gear (7) to rotate smoothly, and (3) is a support frame (8).
) and a stepping motor (5).

Gear (6) is meshed with gear <7).

Next, the operation will be explained. When the stepping motor (5) is moved, the gear (6) rotates and the gear (7) supported by the support frame (8) rotates. Since the gear (7) supports the 41 electromagnet (1), the magnetic field created by the quadrupole electromagnet (1) will therefore rotate around the beam duct (4). Therefore, the X direction of the bim, the convergence in the X direction,
In order to set the divergence force, as well as the degree of coupling of emittance in the X direction and the X direction, that is, the ratio of the size of the beam cross section in the Determine the magnitude of the magnetic field.

3 and 4 show other embodiments, in which a quadrupole electromagnet (1>
and a stepping motor (5) and a gear (6) attached to its shaft are attached to a support frame (9), and a support frame (10) supports the stepping motor (5) so that it can rotate smoothly around the beam duct (4). A gear (7) is attached to the support frame (10) and meshes with the gear (6). The support frame (10) is fixed to the beam duct (4). Therefore, in this case, the stepping motor (5) itself has 4fl! The device is configured to rotate together with the magnet 1), and there is no need for a pedestal to support the entire device.

In addition, in the above embodiment, whether gear meshing was used or
It may be possible to use friction using a car or the like, or to use a power transmission method such as Hell I~ or a chain.

Further, although a stepping motor is used, other drive devices may be used as long as they can be controlled.

[Effects of the Invention] As described above, according to the present invention, the quadrupole electromagnet is configured so that it can be rotated at any angle around the beam axis. The adjustment of beam parameters that has been carried out can be achieved with an inexpensive structure, and there is also the advantage that less space is required in the direction of the beam trajectory for installing this device.

[Brief explanation of the drawing]

FIG. 1 is an elevational sectional view of one embodiment of the invention, FIG. 2 is a side view, FIG. 3 is an elevational sectional view of another embodiment, FIG. 4 is a side view, and FIGS. Each figure is a partial elevational sectional view of a conventional charged particle device, and FIG. 7 is a perspective view. (1) Quadrupole electromagnet, (4) Beam duct, Stepping motor, Gear, Gear, etc. In each figure, Support frame. The same reference numerals indicate the same or equivalent parts. Agent Sogado Shoji 2, Ogi, 5, Ng, 7] Ng, 6

Claims (1)

[Claims] A charged particle device comprising a quadrupole electromagnet and a drive device that rotates the quadrupole electromagnet at an arbitrary angle around a charged particle orbit axis.