JP2905429B2 - Synchrotron radiation light beam concentrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchrotron radiation light beam condensing apparatus for converging a synchrotron radiation light beam taken out from a circular particle accelerator (synchrotron) by reflecting it on a mirror and leading it to an experimental apparatus. It can be widely applied to cutting-edge technical fields such as basic research in material science and life science, semiconductor device development, etc., such as investigating the physical properties of various substances and elucidating the structure of proteins.

[0002]

2. Description of the Related Art Synchrotron radiation is extracted from a circular particle accelerator (synchrotron). The optical axis of the synchrotron radiation is not parallel and tends to slightly diffuse in the vertical direction. , There is a tendency to spread widely in the lateral direction.

[0003] Therefore, in order to converge a synchrotron radiation light beam in a specific direction, it is necessary to refract the vertical component very small and precisely, and refract the horizontal component greatly. In general, a long mirror with a concave cross section is placed in an ultra-high vacuum, and the long mirror reflects the synchrotron radiation light beam and refracts it so that the horizontal component is converged at one point. However, since the vertical component needs to be refracted extremely small and precise,
It is desirable to bend the long mirror slightly in the longitudinal direction so that the refraction of the longitudinal component can be fine-tuned.

Therefore, a conventional synchrotron radiation light beam condensing apparatus has a long mirror having a concave cross section set in an ultra-high vacuum, and the long mirror is held by a frame.
The bottom surface of the frame is supported by fulcrums located closer to the center than both ends of the long mirror, and a downward pressing force is applied to both ends of the frame to cause the long mirror to slightly bend upward in the longitudinal direction. Alternatively, the bottom surface of the frame is supported by fulcrums located at both ends of the long mirror, and a downward pressing force is applied to two points closer to the center from both ends of the frame to move the long mirror downward in the longitudinal direction. By slightly bending, the refraction of the longitudinal component of the synchrotron radiation is finely adjusted to focus the synchrotron radiation beam in a specific direction.

[0005]

However, in the above-mentioned conventional synchrotron radiation light beam condensing apparatus,
A pressing force is applied to both ends or two points near the center of the frame body holding the long mirror through mechanical traction means such as hydraulic cylinders which are separately operated, and the long mirror is slightly moved in the longitudinal direction. 2
It is extremely difficult to balance the pressing force at a point, and if it is unbalanced at all, the optical axis of the synchrotron radiation will be disturbed, and the synchrotron radiation light beam can be focused at a predetermined position. However, there is a drawback that considerable skill is required to finely adjust the refraction of the longitudinal component of the synchrotron radiation, making it difficult to control.
Further, in the conventional apparatus, the pressing force directly acts on the frame holding the long mirror via the mechanical pulling means, so that the expensive long mirror which has been subjected to ultra-precision surface processing is damaged. There was a drawback that it was easy.

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned conventional drawbacks, and can precisely and easily fine-tune the refraction of the longitudinal component of synchrotron radiation, and is easy to control and lightweight. Can be made compact,
An object of the present invention is to provide a synchrotron radiation light beam condensing device capable of preventing breakage of a long mirror.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a long mirror which is installed in an ultra-high vacuum and has a concave cross section for reflecting a synchrotron radiation light beam, and a long mirror. Each of the two ends of the scale mirror is clamped, and has a fixing member having a support shaft on both side surfaces, and an outer frame supported by a column supporting the support shaft of the fixing member via a bearing, and a gap between the two fixed members is provided. A synchrotron radiation light beam condensing device, which is connected by a piano wire parallel to the bottom surface of the long mirror and has a pulling means for pulling the center of the piano wire in a direction perpendicular to the bottom surface of the long mirror by a step motor. Is constituted.

Since the synchrotron radiation light beam condensing device of the present invention is constituted by the above means, when the stepping motor is driven, the center of the piano wire is perpendicular to the bottom surface of the long mirror by the pulling means. However, since the traction force is applied equally to both fixing members via the elasticity of the piano wire, the long mirror clamped by the fixing members is supported by bearings on the outer frame. The bending mirror around the axis of the support shaft of the fixed member acts, the long mirror is bent in the longitudinal direction, and the refraction of the longitudinal component of the synchrotron radiation is finely adjusted precisely by a step motor, and optionally Will be controlled.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described based on an embodiment shown in the drawings. FIG. 1 is a partial longitudinal sectional side view of a synchrotron radiation light beam condensing apparatus showing an embodiment of the present invention, and FIG. 2 is a transverse sectional view taken along line AA in FIG.

In FIG. 1, reference numeral 1 denotes a long mirror for reflecting a synchrotron radiation light beam, the cross section of which is formed in a concave shape, and is set in an ultra-high vacuum with a mirror surface 2 facing upward. Reference numeral 3 denotes a fixing member that clamps both ends of the long mirror 1 and includes a top plate 3a, a bottom plate 3b, and both side plates 3c and 3c, and is fixed by bolts 4.

Reference numeral 5 denotes a spacer for pressing and holding the long mirror 1 without difficulty. The top plate 3a of the fixing member 3 and the long mirror 1
And is attached to the top plate 3 a with bolts 6. Reference numeral 7 denotes both side plates 3c, 3c of the fixing member 3.
Are horizontal support shafts provided on both side surfaces of.

Reference numeral 8 denotes an outer frame surrounding the fixing member 3, and a top frame 8a,
It is composed of a bottom frame 8b and both side frames 8c, 8c, and is fixed by bolts 9. Reference numeral 10 denotes a bearing, and a support shaft 7 horizontally provided on both side surfaces of the fixing member 3 is supported by the side frames 8c, 8c of the outer frame 8 via the bearing 10.

Reference numeral 11 denotes a column standing on a gantry 12. The outer frame 8 is supported by the column 11 by fixing its bottom plate 8b to a flange 13 at the upper end of the column 11 with bolts 14. Reference numeral 15 denotes two piano wires arranged in parallel with the bottom surface of the long mirror 1, both ends of which are fixed to the bottom plate 3 b of the fixing member 3 via bolts 16 or the bottom plate 3 b of the fixing member 3. And is fixed to a connecting portion 3d of the fixing member 3 via a stopper 17 to connect the fixing members 3-3.

Reference numeral 18 denotes a towing rod for sandwiching the center of two piano wires 15 having upper ends parallel to each other and towing in the direction perpendicular to the bottom surface of the long mirror 1, and the lower end thereof has a step motor 19.
Is engaged with a gear box 20 that converts the rotational force of the tow into a linear motion, and the amount of vertical movement of the towing rod 18 is measured by a linear scale 21.

In the synchrotron radiation light beam condensing device configured as described above, when the step motor 19 is operated, the step motor 19 rotates stepwise by a pulse input, and the rotational force is reduced by the gear box 20.
And the tow rod 18 is raised and lowered in response to the pulse input. Then, the central portions of the two piano wires 15 parallel to the bottom surface of the long mirror 1 are connected to the traction rod 18, the step motor 19, and the gear box 20.
The pulling means is pulled in a stepwise manner in a direction perpendicular to the bottom surface of the long mirror 1 in proportion to the amount of rotation of the stepping motor 19, and the stepwise pulling force is generated by the elasticity of the piano wire 15. The two fixed members 3 connected by the piano wire 15 are
, An excessive bending moment load is directly applied to the long mirror 1 clamped by the fixing member 3 even if it is rotated around the axis of the support shaft 7 supported on the outer frame 8 via There is no.

Therefore, the long mirror 1 is a linear scale 2
1, the bending moment is gradually applied to both ends of the tow rod 18 in accordance with the amount of vertical movement of the tow rod 18 to bend in the longitudinal direction. Therefore, the synchro reflected by the long mirror 1 in an ultra-high vacuum The longitudinal component of the synchrotron radiation is precisely refracted in accordance with the degree of curvature of the long mirror 1 in the longitudinal direction.

Since the step motor 19 can be digitally controlled, by using an encoder,
The feedback control is performed using the measurement signal of the linear scale 21, and the fine adjustment control of the refraction of the longitudinal component of the synchrotron radiation light can be easily performed. However, the fixing member 3, the outer frame 8, the traction rod 18, the step motor 1
9, the traction means including the gear box 20 and the like is not limited to the illustrated embodiment, and it goes without saying that the design can be changed as appropriate.

Further, the piano wire 15 has a longitudinal elastic modulus and a diameter selected as appropriate, and the value, the amount of vertical movement of the towing rod 18 measured by the linear scale 21 by towing the towing rod 18 by the stepping motor 19, and the like. By calculating the bending moment acting on both ends of the long mirror 1, the degree of curvature of the long mirror 1 in the longitudinal direction can be calculated in advance.

[0019]

As described above, according to the present invention, since the bending moment is applied to the long mirror by the piano wire, an unreasonable load is not applied to the long mirror, and the cost is high. Not only is there no risk of damaging the long mirror, but also because only one central part of the piano wire is pulled, the bending moment acts uniformly on both ends of the long mirror in a well-balanced manner. There is no disturbance in the optical axis.

Further, since the stepping motor is used for pulling the piano wire, the refraction of the longitudinal component of the synchrotron radiation can be finely adjusted precisely, and the feedback control and the like are easy. Furthermore, the piano wire can have its longitudinal elastic modulus, diameter and number appropriately changed according to the long mirror to be used, so that it can be manufactured at low cost, light weight and compactness. It is possible to provide a synchrotron radiation light beam focusing apparatus which is extremely effective in practice.

[0021]

[Brief description of the drawings]

FIG. 1 is a partial vertical sectional side view of a synchrotron radiation light beam condensing device showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line AA in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Long mirror 2 Mirror surface 3 Fixing member 4 Bolt 5 Spacer 6 Bolt 7 Support shaft 8 Outer frame 9 Bolt 10 Bearing 11 Support post 12 Mount 13 Flange 14 Bolt 15 Piano wire 16 Bolt 17 Stopper 18 Pulling rod 19 Step motor 20 Gear box 21 Linear scale

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H05H 13/04 G21K 1/06 G21K 5/02 JICST file (JOIS)

Claims (1)

(57) [Claims] 1. A long mirror which is set in an ultra-high vacuum and has a concave cross section for reflecting a synchrotron radiation light beam, and has both ends of the long mirror clamped and support shafts on both side surfaces. A fixed member, and an outer frame supported by a column supporting a support shaft of the fixed member via a bearing, wherein the two fixed members are connected by a piano wire parallel to the bottom surface of the long mirror, and the piano A synchrotron radiation light beam condensing device comprising a pulling means for pulling a central portion of a line by a step motor in a direction perpendicular to the bottom surface of a long mirror.