JPH0770360B2 - Polarization generator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a polarization generation device called a wiggler or an undulator for a light intensity light source, and relates to a split magnet array having a two-stage structure in which a pair of magnet arrays is vertically divided into two. And nothing,
The present invention relates to a polarized light generating device in which a pair of non-gap side divided magnet rows are moved in the same direction to change the magnetic field strength and which eliminates the need for gap adjustment between magnet rows that requires strict horizontality.

BACKGROUND ART When an electron beam close to the speed of light passes through a magnetic field, it generates electromagnetic waves, that is, synchrotron radiation light, but different magnetic pole magnets are alternately arranged to pass this electron beam through a magnetic field whose magnetic field direction changes alternately. , They interfere with each other to obtain light with higher brightness. (Japanese Patent Laid-Open No. 61-19100) Such a coherent radiation light generator is called an insertion type light source, and is used, for example, in an electron storage ring. Due to the difference in polarization characteristics, it is 2N times the magnetic field frequency (N). The type that can obtain light is called a wiggler, and the type that can obtain light with an intensity of N ² is called an undulator because the magnetic field is weaker than this and the amplitude of the electron orbit is extremely small.

As shown in FIG. 3, the configuration of the polarized light generating device is such that a plurality of magnet blocks (22) having different required magnetization directions and having a required size are arranged in a required pattern so that the magnetic field directions are alternately changed. 21a) and (21b) are made to face each other on vertical columns using various mechanical support mechanisms, and it is necessary to change the magnetic field strength in order to obtain the required high-intensity radiated light. ) (21b) can be adjusted to the required gap (Lg) size.

Therefore, the horizontally arranged magnet array is required to have extremely high ascending / descending positioning accuracy and extremely high parallelism after gap adjustment.

The mechanical support mechanism for horizontally supporting the pair of magnets or a plurality of pairs of magnets so as to be able to move up and down is such that the support beam with the magnets is abutted against a vertical column with a linear bearing interposed, or a vertical shape with a required shape is used. A structure with a pillar inserted or a structure with a ball screw is used. For any type of linear motion bearing or ball screw, the vertical positioning accuracy is 10 μm due to the accuracy of the bearing or the accuracy of the ball.
However, it was difficult to reduce the parallelism to 50 μm / m or less.

Further, as a means for changing the gap amount, a configuration is conceivable in which one screw shaft is provided with a right-handed screw part and a left-handed screw part, and the gap amount is changed by rotating the screw shaft synchronously in the forward or reverse direction. However, there was a limit to ensuring the mechanical accuracy in handling the displacement in the unit of μm.

Therefore, as shown in FIG. 4, the applicant has installed a pair of horizontal beams (20) on the upright columns (4) to raise and lower the brackets (1).
(0) so that it can be moved up and down, and the horizontal beam (20) supports the magnet rows (21a) (21b), and the lifting bracket (10)
A pair of magnets that are opposed to each other by being screwed into a pair of screw shafts (7a) and (7b) in which reverse screws are screwed into one by a coupling (30) having a phase adjusting mechanism. Proposed a polarization generator that can adjust and position the gap between rows (21a) and (21b) with extremely high precision and parallelism (Japanese Patent Application No. 1-
No. 257337).

Further, in this polarization generating device, the vertical sliding surface of the lifting bracket is made into a tapered surface and a low friction coefficient slider member having an inverse taper surface is used for the lifting support mechanism, and the vertical surface of the column and the predetermined surface of the lifting bracket are used. It is indispensable to have a high-precision mechanical mechanism that handles displacements in the unit of μm, such as eliminating the gap between and.

SUMMARY OF THE INVENTION The present invention has been made in view of the current situation in which a gap between a pair of magnet rows of a polarization generating device that face each other must be vertically moved with high accuracy and high parallelism. It is an object of the present invention to provide a polarized light generating device having a configuration that does not require.

SUMMARY OF THE INVENTION According to the present invention, a pair of magnet rows in which a plurality of magnets having different magnetization directions are horizontally arranged in a required pattern are opposed to each other to form a required gap between the magnet rows, and a magnetic field is applied to electrons passing through the gap. In the polarized light generating device, the horizontally arranged magnet rows are vertically divided into two, and the arranged magnet rows having the same magnetization direction pattern are stacked in two stages, and the divided magnets on the non-gap side of each magnet row are arranged. The polarized light generating device is characterized in that the row is horizontally movable with respect to the split magnet row on the gap side, and is moved in the same direction to change the magnetic field strength generated in a required gap.

Disclosure Based on the Drawings of the Invention FIG. 1 is an explanatory diagram showing a configuration of a magnet array of a polarization generating device according to the present invention.

FIG. 2 is an explanatory view of an embodiment showing a supporting structure of a split magnet array of the polarization generating device according to the present invention.

FIG. 3 is an explanatory diagram showing the configuration of a magnet array of a conventional polarization generator. FIG. 4 is a front explanatory view of a polarization generating device according to the applicant's previous proposal.

In the present invention, as a result of various studies for the purpose of eliminating the need for adjusting the gap of the polarized light generator, a pair of magnet rows is vertically divided into two to form a two-stage divided magnet row. The inventors have found that the required change in magnetic field strength can be easily obtained by moving the split magnet rows in the same direction, and the conventional gap adjustment mechanism is no longer required, and the present invention has been completed.

The polarization generator according to the present invention will be described with reference to the example of the polarization generator according to the previous proposal shown in FIG. 4, in which a parallelism adjuster (2) including a bolt and a nut member is provided on the floor (1). In a box-shaped frame in which four prismatic pillars (4) are erected on a horizontally arranged common base (3) and a beam member (5) is provided on the upper end thereof, the shorter side of the box-shaped frame. A beam (20) for supporting a divided magnet array arranged in a supporting structure described later between two adjacent columns (4) (4)
It is an extremely simple structure that only secures the lifting bracket (10), screw shafts (7a) (7b) and their bearings (6a ₁ ) (6a ₂ ) (6b ₁ ) (6)
b ₂ ), driving step motor (9), gear box (8), etc. are not required.

The magnet array of the polarized light generator according to the present invention comprises a pair of magnet blocks (22) of different dimensions, each having a required size and arranged in a required pattern so that the magnetic field direction alternates as shown in FIG. Place the magnet rows (21a) (21b) up and down 2
As shown in FIG. 1, the magnet array is divided into two magnet arrays having the same magnetization direction pattern and stacked in two stages (23a _{1, 2} ) (23b).
_1,2 ).

To be more specific, each magnet block (2
2), as Figure 1, indicating the upper magnet row (23a), and L ₁ × W dimension of the magnet blocks of the gap side (24a _1), the L ₂ × W dimension of the non-gap side magnet blocks ( 24a ₂ ) and 2 up and down
Divided and, are without a superposed two-step split magnet row of the gap the upper magnet row (23a) side (23a ₁₎ and a non-gap-side divided magnet rows (23a ₂₎ configuration.

Similarly, the lower magnet row (23b) is also divided into two upper and lower magnet blocks (24b ₁ ) (24b ₂ ), and the upper and lower divided magnet rows (23b ₁ )
It has a two-tiered structure of (23b ₂ ).

Various supporting structures for these divided magnet rows are conceivable, but here, an example having a simple structure shown in FIG. 2 will be described.
Further, although FIG. 2 shows the supporting structure of the divided magnet rows (23b ₁ ) (23b ₂ ) forming the lower magnet row (23b), the same structure can be adopted for the upper magnet row (23a).

The supporting structure is a pair of L-shaped supporting members (26) arranged on a substrate (25) mounted on the I-shaped beam (20) shown in FIG.
(26) and the gate-shaped support member (27).

That is, the split magnet row (23b ₁ ) on the gap side is sandwiched and fixed by a pair of L-shaped support members (26) (26) having a convex portion that fits into a groove portion provided on the side end surface thereof.

The split magnet row (23b ₂ ) on the non-gap side is fixed to the recess of the gate-shaped support member (27) having the bearings (28) on the upper and lower surfaces, and is horizontally movable on the substrate (25). , A known screw feed mechanism, a cylinder mechanism, or the like that can be easily moved. Each magnet row (23a) (23b) has a non-gap side divided magnet row (2
3a ₂ ) (23b ₂ ) to the fixed gap side split magnet row (23a 2
₁ ) (23b ₁ ), in such a configuration that is horizontally movable, by moving the non-gap side divided magnet rows (23 a ₂ ) (23 b ₂ ) in the same direction, the required gap (Lg) is The strength of the generated magnetic field can be changed.

The present invention is characterized by a magnet array consisting of two stacked magnet segments each having the same array of magnetization direction patterns. However, the split magnet blocks (24a ₁ ) (24a ₁ ) (24a ₁ ) (24a ₁ ) on the gap side and the non-gap side of each magnet block are characterized. The dimensional ratio in the vertical direction (L) as shown in FIG. 1 of ₂ ) is appropriately selected according to the set gap (Lg) amount, the required change amount of the magnetic field strength, and the like.

Therefore, in each magnet row (23a) (23b), the divided magnet row on the gap side (23a ₁ ) (23b ₁ ) and the divided magnet row on the non-gap side
Since the magnetic forces generated from (23a ₂ ) and (23b ₂ ) are the same as or different from each other, the dimensional ratio can be changed and the magnet material can be changed.

Further, the polarization generating device according to the present invention is shown in FIG. 2 if the split magnet rows on the non-gap side can be horizontally slidable and the beams or the like for supporting the magnet rows can be horizontally supported by the frame. In addition to the configuration, any known frame configuration can be adopted.

EFFECTS OF THE INVENTION The polarization generator according to the present invention is configured such that a pair of magnet rows is vertically divided into two to form a two-stage divided magnet row, and the pair of non-gap side divided magnet rows can be moved and adjusted in the same direction. By doing so, the required change in magnetic field strength can be easily obtained,
The gap adjusting mechanism that requires high precision can be eliminated, and the structure of the device can be made extremely simple.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the structure of a magnet array of a polarization generator according to the present invention. FIG. 2 is an explanatory view of an embodiment showing a supporting structure of a split magnet array of the polarization generating device according to the present invention. FIG. 3 is an explanatory diagram showing the configuration of a magnet array of a conventional polarization generator. FIG. 4 is a front explanatory view of a polarization generating device according to the applicant's previous proposal. 1 ... Floor, 2 ... Parallelism adjuster, 3 ... Common base,
4 ...... struts 5 ...... beam _{member, 6a 1, 6a 2, 6b} 1, 6b 2 ...... bearings, 7a, 7b ...... screw shaft, 8 ...... gearbox 9 ...... step motors, 10, 15 ... … Lifting bracket, 11 …… Holder, 12 …… Slider, 13 …… Resin layer, 14a, 14b… Nut member, 20 …… I-beam, 21 ……
Magnet array, 21a, 21b, 23a, 23b ... Magnet array, 24a ₁ , 24a ₂ , 24b ₁ ,
24b ₂ ...... Magnet block, 23a ₁ , 23a ₂ , 23b ₁ , 23b ₂ ...... Split magnet array, 25 ...... Substrate, 26 ...... L type support member, 27 ...... Gate type support member 28 ...... Bearing, 30 ... Coupling.

Continuation of the front page (56) References JP-A-62-229800 (JP, A) JP-A-2-195700 (JP, A) JP-A-3-119700 (JP, A)

Claims (1)

[Claims] 1. A pair of magnet rows in which a plurality of magnets having different magnetization directions are horizontally arranged in a required pattern are opposed to each other to form a required gap between the magnet rows, and a magnetic field is applied to electrons passing through the gap. In the polarized light generating device, the horizontally arranged magnet rows are vertically divided into two, and the arranged magnet rows having the same magnetization direction pattern are stacked in two stages, and the divided magnet rows on the non-gap side of each magnet row are arranged. A polarized light generation device characterized in that it is movable horizontally with respect to the split magnet row on the gap side and is moved in the same direction to change the magnetic field strength generated in a required gap.