JPH10326700A - Insertion type polarized light generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device mechanically closely fixed with a magnet so as to be movable adjustable by fitting a sub-magnet supporting base fixed by a bolt in a dovetail groove with a magnet supporting base, the sub-magnet supporting base having a magnet holder serially holding a number of magnets in a horizontal direction, and fixing it by a bolt, connecting the longitudinal side surfaces of the sub and the main bodies by a jig and fixing these by bolts in a horizontal direction. SOLUTION: By the divided magnet supporting bases 2 to 4 of a magnet supporting base 1, vertical and horizontal magnetic field magnet columns A2 , B3 and B4 are fixed and held by magnet holders 11, 13 and 15. The magnet holder 11 fixing the vertical magnetic field magnet column A2 is fixed in a center magnet supporting base 2 by a bolt 7, and the magnet column A2 is fixed to the magnet holder 11 by a key groove by using a key 12. The magnet supporting bases 3 and 4 of the horizontal magnetic field magnet columns B and B fix the magnet holders 13 and 15 by dovetail groove fitting and bolt-fixed sub-magnet supporting bases 5 and 6. Further, the sub- magnet supporting bases 5 and 6 and the magnet supporting bases 3 and 4 increase a mechanical fitting strength by a connecting jig 9 in a side face. Thus, a movement in each direction of the magnet column is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a magnet holding structure constituting a magnetic circuit of an insertion type polarization generator called an undulator or a wiggler. The present invention relates to an insertion type polarization generator having a structure for holding a magnet which is closely adhered to a magnet.

[0002]

2. Description of the Related Art When an electron beam near the speed of light passes through a magnetic field, an electromagnetic wave, that is, synchrotron radiation is generated. By using this in an electron storage ring as a synchrotron radiation light source, the basic properties of synchrotron radiation are obtained. Because it can utilize various characteristics such as high directivity, high intensity, high polarization, etc., its application range is dramatically expanded as an ideal light source that can be applied to a wide variety of science and technology and processing technology. .

[0003] Today's electron storage rings use a plurality of insertion light sources called wiggler or undulator, which are high brightness light sources with higher beam current and smaller beam cross section. That is, if an electron beam near the speed of light is passed through a magnetic field in which the direction of the magnetic field changes alternately by alternately disposing different magnetic pole magnets, strong light (radiation light) is generated every time the trajectory of the electron beam is bent (meandering). The generated light interferes with each other to obtain light with higher brightness. However, due to the difference in the meandering angle, a type that can obtain light of 2N times the number of periods (N) of the magnetic field is a wiggler. weak type the amplitude of the electron orbit is extremely small light intensity of N ² is obtained is called the undulator.

As shown in FIG. 5, the arrangement of magnets in an undulator is such that a plurality of magnets of required dimensions having different magnetization directions are arranged horizontally in a required pattern so that the magnetic field direction changes alternately. Two pairs of magnet rows A ₁ , A ₂ and horizontal magnetic field magnet rows B ₁ , B ₂ , four magnet rows A ₁ ,
A ₂ , B ₁ , and B ₂ are horizontally arranged in four beams, up, down, left, and right, and are arranged so as to form a tunnel by being surrounded by a magnet array, but each magnet array can be individually moved in three axial directions. In order to obtain high-intensity radiated light of a predetermined wavelength, it is necessary to change the magnetic field strength, and between the magnet rows (A ₁ , A ₂ ) The structure is such that the gap between the magnet rows (B ₁ , B ₂ ) can be adjusted and positioned to a required gap (Lg) dimension.

In the undulator shown in FIG. 5, the magnet rows A ₁ , A ₂ , B ₁ , B ₂ move in the z direction, the magnet rows A ₁ , A ₂ move in the y direction, When the rows B ₁ and B ₂ move in the x direction, linear, elliptical, and circularly polarized light can be obtained, and the magnet rows A ₁ , A ₂ , B ₁ , and B ₂ individually move in three axial directions. Since the apparatus is held by a mechanical support mechanism as much as possible, there is a problem that the entire apparatus is very complicated and large.

Therefore, in recent years, there has been proposed an undulator having a structure in which a pair of upper and lower beams vertically opposed to each other holds a magnet array to simplify and reduce the size of the entire apparatus. That is, as shown in FIG. 4, the upper and lower horizontal magnet rows are opposed to each other, and the upper row is the center magnet row A _1.
, Two magnet rows B ₁ , B ₂ are arranged on the lower side, and two magnet rows B ₃ , B ₄ are similarly arranged on the lower side, sandwiching the central magnet row A ₂ , and the magnet rows B ₁ , A ₁ , B _The distance between the opposing surfaces of the magnets ₂ and the magnet rows B ₃ , A ₂ , B ₄ can be adjusted, that is, three upper and lower horizontal magnet rows are held so as to be movable in the y direction, and the magnet rows B ₁ , B ₂
B ₂ , B ₃ , and B ₄ are respectively held so as to be movable in the z direction, the distance between the upper and lower central magnet rows A ₁ and A ₂ is adjusted, and the z of the magnet rows B ₁ , B ₂ , B ₃ , and B ₄ is adjusted. The configuration is such that linear, elliptical, and circularly polarized light can be obtained by adjusting the movement in the direction.

[0007]

The magnetic circuit of the insertion type polarized light generator shown in FIG. 4 consisting of a set of three magnets vertically opposed to each other can be moved in three axial directions individually. As compared with the conventional configuration, the beam is supported by one beam at the top and one at the bottom, so that it is basically easy to reduce the size and weight. It is necessary to devise a method for holding and fixing the magnet array to a required movable holder.

A conventional method of manufacturing a magnetic circuit unit composed of four rows of magnets has employed a method of attaching and fixing magnets with an adhesive using a jig. However, fixing the magnet via the adhesive not only complicates the fixing operation, but also does not always have sufficient fixing strength. Particularly, the magnetic circuit that constitutes the polarization generator is required to be installed in an ultra-high vacuum environment. When it is used by placing it in a space, there is a problem that the adhesive cannot be used because the resin volatilizes from the adhesive.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic circuit comprising a magnet array constituting an insertion type polarization generator, wherein a magnetic circuit holding the magnet array can be formed without using an adhesive. It is an object of the present invention to provide an insertion type polarization generator having a configuration in which a magnet can be tightly fixed to a holding mechanism capable of performing required movement adjustment by mechanically fixing the magnet tightly.

[0010]

SUMMARY OF THE INVENTION A part of the present inventors has disclosed an insertion type in which a magnetic circuit is constituted by a pair of upper and lower magnet rows that are opposed to each other via a gap as a set of three magnet rows. In a configuration in which a magnet array of a polarization generator is held by a magnet support, strong R-Fe-B-based magnets can be mechanically anchored and results of various studies on a mechanical anchoring method that facilitates assembly of the magnet array. When mounting a magnet row on a magnet support table that is held movably in the required direction, a magnet holder that can be fixed using a clamp member or key that can be fitted with groove processing or taper processing on the magnet. By interposing each magnet row, a large number of high-magnetism magnets having different magnetization directions can be easily arranged and fixed in a required pattern, and the magnet holder for each formed magnet row can be easily mounted on the magnet support base. Can be attached to It was seen.

In addition, when the above-mentioned magnet holder is fixed to the magnet support base, the magnet support base is divided into a sub-type and a main body side so that the magnet holder can be mounted on the magnet support base. Focusing on the fact that it can be easily done, we examined the connection configuration between the sub that bolts the magnet holder and the magnet support base on the main body side. Secure mating,
By fastening both with vertical bolts, connecting both side end faces with jigs and fixing with horizontal bolts, we found that mechanical coupling of dovetail groove can be firmly and reliably performed, The present invention has been completed.

Further, the present inventors have proposed a horizontal magnetic field magnet array on each side of a pair of upper and lower magnet arrays and a central vertical magnetic field magnet so as to realize a magnetic field adjustment within a predetermined gap in order to obtain a desired polarization. In order to make it possible to relatively move the magnet array in the horizontal (z-axis) direction, a magnet support base on which the magnet holders of the magnet arrays for horizontal magnetic fields on both sides are fixedly mounted is mounted via a direct-acting cross roller bearing. The inventor of the present invention has found out that, by movably mounting the base, the movement can be adjusted with an accuracy of several μm to several tens of μm.

That is, the present invention provides an insertion-type polarization generator having a pair of upper and lower magnet supports and having a horizontal magnetic field magnet row and a vertical magnetic field magnet row mounted on the same magnet support. The magnets are held by a magnet holder capable of arranging a large number of magnets in series in the horizontal (z-axis) direction for each magnet row,
The magnet holder is fixed to the magnet support table, and the sub-magnet support table to which the magnet holder is fixed with the vertical bolts is provided in the dovetail groove provided in both the magnet support table on the main body side and the magnet row direction. This is an insertion type polarization generator in which both are fixed with vertical bolts, and the longitudinal side surfaces of the sub and main body of the magnet support are fastened with a jig and fixed with horizontal bolts. .

According to the present invention, there is provided an insertion type polarization generator having a pair of upper and lower magnet supports, wherein a horizontal magnetic field magnet row and a vertical magnetic field magnet row are mounted on the same magnet support. A plurality of magnets are held in a magnet holder that can be arranged in series in the horizontal (z-axis) direction for each magnet row, and the magnet holder is fixed to a magnet support table. The three magnet rows of the horizontal magnetic field magnet rows on both sides are set as one set and are opposed to each other via an air gap so that the relative distance (y-axis direction) between the upper and lower magnet row groups can be adjusted. Each of the magnet supports for holding the magnet rows is, for example, a direct-acting cross roller so that both side magnet rows of the magnet row group and the center magnet row can be relatively moved in the horizontal (z-axis) direction. Insertable polarized light movably mounted on the device base via bearings It is a raw device.

Further, in the above-mentioned insertion type polarized light generator of the magnetic field adjustment type, a sub-magnet support base to which a magnet holder is fixed with a vertical bolt is provided on both the main body side magnet support direction and the magnet row direction. Insertion type polarized light that can be fitted in the groove, fixed both with a vertical bolt, and the longitudinal side of the sub and main body of the magnet support base is fastened with a jig and fixed with a horizontal bolt. A generator is proposed.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, an insertion type polarization generating apparatus to be used has a pair of upper and lower magnet supports, and a horizontal magnetic field magnet row and a vertical magnetic field magnet row are mounted on the same magnet support. As long as the horizontal magnetic field magnet row and the vertical magnetic field magnet row are arranged independently and movably so that the magnetic gap can be adjusted, any configuration including the insertion type polarization generator of the embodiment can be adopted.

The configuration of the magnet support and the magnet holder of the insertion type polarization generator according to the present invention will be described in detail with reference to the drawings. The configuration example shown in FIG. 1 shows the lower side of a pair of upper and lower magnet rows as shown in FIG. 4 together with their magnet supports and magnet holders, and the magnet supports and magnet holders of the upper magnet row group have the same configuration. Is adopted. The three-part magnet support 1 on which the magnet holder 10 is mounted is horizontal (z-axis).
For example, as shown in FIG. 3, the upper and lower beams 2 are mounted on a beam 27 that is cantilevered by a vertical guide 31 of a column 30 and supports a pair of upper and lower magnet rows.
The magnetic gap can be adjusted by moving the magnetic heads 7 and 27 toward and away from each other.

The magnet support 1 has a magnet array A for vertical magnetic field at the center.
Magnet support base 2 and the magnet array for a horizontal magnetic field on both sides B ₃ for _2, B ₄ is divided into the magnet support table 3 and 4 for supporting the respective through a magnet holder 11, 13 and 15 The magnet rows A ₂ , B ₃ and B ₄ are fixedly held.

[0019] In detail, the center of the magnet support base 2 are then placed and fixed the magnet holder 11 which is fixed a magnet array A ₂ for vertical magnetic field bolting or the like, each block of the magnet for vertical field sequence A ₂ Each of the magnets forms a key groove and is fixed to the magnet holder 11 by a key 12. Magnet supports ₃ , ₄ for supporting the horizontal magnetic field magnet rows B ₃ , B ₄ on both sides are provided via sub-magnet supports 5, 6, which are mounted and fixed by groove fitting and bolting, respectively. And magnet holder 1
3 and 15 are mounted and fixed with bolts.

More specifically, the magnet holders 13 and 15 are mounted on the upper surfaces of the sub-magnet support bases 5 and 6 and fixed by bolts 7 from the lower surface side. It is. On the lower surfaces of the sub-magnet supports 5 and 6 and the upper surfaces of the magnet supports 3 and 4 on the main body side, dovetail grooves 8 that can be fitted to both are formed in the magnet arrangement direction. The sub-magnet supports 5 and 6 are fixed from the upper surfaces with stud-type bolts 7.

Further, a fastener 9 for securing horizontal fastening is provided on each longitudinal side surface of the sub magnet support bases 5, 6 and the magnet support bases 3, 4. One end of the lateral pressing jig 9a is screwed to the side surfaces of the sub magnet support bases 5, 6 with bolts 9b and is rotatable, and the other end is at the required position of the magnet support bases 3, 4 with the lateral pressing bolt 9c. The sub-magnet supports 5 and 6 and the magnet supports 3 and 4 are pressed through in the direction of the dovetail groove 8 so as to further strengthen the mechanical fit between them.

Each of the block magnets in each of the above-mentioned magnet rows B ₃ and B ₄ has a shallow groove for fitting in the arrangement direction on the upper surface end, and a deep groove for fitting also on the lower side surface at the diagonal position. b are provided on the magnet holders 13 and 15 having a substantially L-shaped cross section so as to fit into the shallow groove at the upper end of the magnet.
16 are provided, and clamp members 17 and 18 each having a claw portion to be inserted into the groove b on the lower side surface of the magnet are bolted to the end of the holder, and each block-shaped magnet of the magnet rows B ₃ and B ₄ is a magnet holder. 13 and 15 are fixed.

A non-magnetic material such as stainless steel or aluminum alloy can be used for the magnet holder, the clamp material for fixing, the bolt, the screw, the fastener, and the like. Rare earth magnets such as R-Fe-B based sintered magnets having high mechanical strength can be used.

Next, another example of the configuration of the insertion type polarization generator according to the present invention, that is, the horizontal magnetic field magnet rows on both sides and the central vertical magnetic field magnet rows on each side of a pair of upper and lower magnet rows are horizontally (z An example of a configuration that is relatively movable in the (axis) direction will be described in detail with reference to the drawings. The configuration of the magnet support and the magnet holder shown in FIG. 2 is the same as the configuration of the magnet support and the magnet holder shown in FIG.
Shows a configuration mounted movably on the support base 20 via a direct-acting cross roller bearing 25.

The magnet holder 11 to which the vertical magnetic field magnet row A ₂ is fixed is bolted to the magnet support 2, further bolted to the center of the support base 20, and the horizontal magnetic field magnet row B ₃ , magnet holders 13, 15 fixed to B ₄
Are bolted in the order of the sub-magnet supports 5, 6 and the magnet supports 3, 4 and bolted in the magnet row direction to sliders 21, 22 having ball screws 23, 24 built therein, and the sliders 21, 22 are supported. It is arranged in a groove in the beam (z-axis) direction of the base 20, but is movably mounted on the support base 20 via a direct-acting cross roller bearing 25.

The support base 20 is mounted on a beam 27 of the apparatus via a pedestal 26. As shown in FIG. 3, the beam 27 is mounted on a vertical guide 31 of a column 30 so as to be able to move up and down.
The upper and lower beams 27, 27 supporting the pair of upper and lower magnet rows having the configuration shown in FIG. 2 approach and separate from each other via a vertical slider 28 having a vertical screw 29 provided in parallel with the column 30, thereby forming a magnetic gap. It is configured to be adjustable.

Further, the support base 20 is mounted on the beams 27, 27, and a step motor 40 for driving the ball screws 23, 24 of the sliders 21, 22 is connected and mounted via a reduction gear. Placed, slider 2
A rotary encoder 41 for measuring the amount of movement of the first and the second 22 is also mounted.

In the above-described configuration of the magnet holder and the magnet support base, the vertical magnetic field magnet row A ₂ is fixedly arranged at the top and bottom, and one or both of the horizontal magnetic field magnet rows B ₃ and B ₄ are beam (z axis). change the magnetic field is moved in the direction and obtain the required polarization, it adopts the same structure, the magnet array a ₂ for vertical magnetic field
Is movable, and the magnetic field can be changed by fixing one or both of the horizontal magnetic field magnet rows B ₃ and B _4. Of course, as shown in FIG. It can also be fixedly arranged in the (axial) direction.

In particular, when the magnetic circuit constituting the polarization generator, that is, the magnet array for the vertical magnetic field and the magnet array for the horizontal magnetic field are arranged and used in an ultra-high vacuum environment, the magnet arrays are once arranged at predetermined positions. Later, the beam (z
It is not easy to move in the (axial) direction and maintain an ultra-high vacuum, and this leads to an increase in the size and complexity of the entire apparatus. Therefore, usually, all magnet rows are fixed and moved in the beam (z-axis) direction. Adopt a configuration that does not.

On the other hand, a configuration in which each magnet row is relatively movable in the beam (z-axis) direction has an advantage that various polarizations can be easily realized, but as described above,
Since it is not suitable for use in an ultra-high vacuum environment, it is particularly effective in a configuration in which a magnetic circuit is arranged in the atmosphere.

In the basic structure of the apparatus shown in FIG. 3, the column 30 is mounted on a movable base 32 which can be moved horizontally on a rail 33. Can be adopted.

The means for moving each magnet row is not limited to the one shown in the figure, and a known moving motor such as a pulse motor may be used in place of a step motor, It is also possible to employ a slider position detecting device other than the encoder.

[0033]

【Example】

Example 1 An insertion-type polarization generator having a magnet support base and a magnet holder having the configuration shown in FIG. 1 (after the magnet rows once adjusted the magnetic field, they were fixedly arranged without moving in the beam (z-axis) direction). Configuration) was made using a stainless steel such as SUS316L and an R-Fe-B sintered magnet of 35 MGOe BH (max) provided with a TiN coating on the surface. Magnetic properties of 3 kG and a vertical magnetic field strength of 4.6 kG were obtained. When the magnet array (magnetic circuit section) constituting this polarization generator was put into an ultra-high vacuum apparatus and the ultimate vacuum was measured, the degree of vacuum was 1 ×
10 ^-9 Pa or less could be achieved.

Embodiment 2 An insertion type polarization generator having the configuration shown in FIGS.
When made using a stainless steel such as S316L and a BH (max) 35MGOe R-Fe-B based sintered magnet provided with a TiN coating on the surface, a magnetic field intensity almost equal to that of Example 1 was obtained in the atmosphere. I got it.

The polarized light generator includes ball screws 23, 2
In the direct-acting cross-roller bearing 25 between the sliders 21 and 22 having the built-in 4 and the support base 20, the clearance was optimized by adopting a horizontal pressing jig or the like for pressing in the horizontal direction. Movement adjustment is possible with the accuracy of.

[0036]

According to the present invention, there is provided an insertion type polarization generating apparatus in which a magnet array is mounted on a magnet support table movably held in a required direction. A magnet holder that can be fixed using a clamp member or a key is interposed for each magnet row, and when the magnet holder for each formed magnet row is mounted on the magnet support, the magnet support is divided into a sub-type and a main body side. A groove is provided in the magnet arrangement direction on the sub-unit for bolting the magnet holder and the magnet support base on the main body side to secure mechanical fitting, and both are fastened with vertical bolts, and the side end faces of both Are connected by a jig and fixed with horizontal bolts, so that the mechanical connection of the dovetail fitting can be firmly and reliably performed.

In particular, in a configuration in which each magnet row does not relatively move in the beam (z-axis) direction after the magnetic field has been adjusted once, since the adhesive is not used by mechanical fixation, it is required in the apparatus. It can be used at a vacuum degree of 1 × 10 ⁻⁹ Pa or less.

Further, according to the present invention, in order to realize magnetic field adjustment, the horizontal magnetic field magnet row and the central vertical magnetic field magnet row on each side of the pair of upper and lower magnet rows are relatively positioned in the horizontal (z-axis) direction. In order to be able to move freely, the magnet holder on which the magnet holders for the horizontal magnetic field magnet rows on both sides are fixedly mounted is movably mounted on the device base via direct-acting cross roller bearings, The movement can be adjusted with an accuracy of μm to several tens μm.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing the configuration of a magnet support base and a magnet holder of an insertion type polarization generator according to the present invention.

FIG. 2 is a partially cutaway front view showing another configuration of the magnet support base and the magnet holder of the insertion type polarization generator according to the present invention.

FIG. 3 is a schematic explanatory view showing a configuration of an insertion type polarization generator according to the present invention.

FIG. 4 is a perspective explanatory view showing a magnet array of the insertion type polarization generator to which the present invention is applied.

FIG. 5 is a perspective explanatory view showing a magnet row of a conventional insertion type polarization generator.

[Explanation of symbols]

A ₁ , A ₂ , B ₁ , B ₂ , B ₃ , B ₄ Magnet row 1, 2, 3, 4, Magnet support 5,6 Sub-magnet support 7,9b Bolt 8 Groove 9 Fastener 9a Lateral push Jig 9c Lateral push bolt 10, 11, 13, 15 Magnet holder 12 Key 14, 16 Protrusion 17, 18, 22 Clamping material 20 Support base 21, 22, Slider 23, 24 Ball screw 25 Direct-acting cross roller bearing 26 Pedestal 27 Beam 28 Slider 30 Support 31 Vertical guide 32 Moving base 33 Rail 40 Step motor 41 Rotary encoder

Claims (4)

[Claims] 1. An insertion-type polarization generator having a pair of upper and lower magnet supports and a magnet row for horizontal magnetic field and a magnet row for vertical magnetic field mounted on the same magnet support. A structure is adopted in which a magnet is held by a magnet holder capable of arranging a large number of magnets in series in the horizontal (z-axis) direction, and the magnet holder is fixed to a magnet support table, and the magnet holder is fixed by a bolt in a vertical direction. The magnet support base on the main body side and the magnet row can be fitted in dovetail grooves provided in both directions in the magnet row direction, and both are fixed with vertical bolts. An insertion type polarization generator in which the longitudinal side faces are fastened with a jig and fixed with horizontal bolts. 2. An insertion-type polarization generator having a pair of upper and lower magnet supports and having a horizontal magnetic field magnet row and a vertical magnetic field magnet row mounted on the same magnet support, In this configuration, a large number of magnets are held in a magnet holder that can be arranged in series in the horizontal (z-axis) direction, and the magnet holder is fixed to a magnet support table. A pair of upper and lower magnet rows can be adjusted by adjusting the relative distance (y-axis direction) between the upper and lower magnet rows by vertically aligning the three magnet rows of the horizontal magnetic field row as a set through a gap. Of each side magnet row and the center magnet row are horizontal (z
An insertion-type polarization generator in which each magnet support for holding the magnet row is movably mounted on the device base so as to be relatively movable in the axial direction. 3. The insertion type polarization generator according to claim 2, wherein the magnet support on which the magnet holder is fixedly mounted is movably mounted on the apparatus base via a direct-acting cross roller bearing. 4. A sub-magnet supporter according to claim 2 or 3, wherein the magnet holder is fixed with a vertical bolt, and is fitted in a dovetail groove provided on both the main body side magnet supporter and the magnet row direction. An insertion type polarization generator in which both are fixed with a vertical bolt and the longitudinal side surfaces of the sub and main body of the magnet support are fastened with a jig and fixed with a horizontal bolt.