JP2001074554A - Spectrograph - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a Bragg angle hardly shifted. SOLUTION: A moving amount along a longitudinal direction x1 of the first holder 19 and an oscillation amount thereof along a lateral direction α1 with respect to a reference position, an oscillation amount along a lateral direction α2 of the second holder 20 with respect to the reference position, and a tilting amount in a longitudinal direction γ1 of a base 18 having a horizontal axis Z as a center are reduced, when mounted conditions for crystals 21, 22 onto the respective holders 19, 20 are made to bring a Bragg angle into a substantially central value of a setting range thereof in the reference position wherein oscillation angles in the left and right directions α1, α2 of the holder 19, 20 with respect to the base 18 are set into zero, so as to change the Bragg angle upto the maximium value or the minimum value of the setting range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectroscope.

[0002]

2. Description of the Related Art When an electron moving at a speed close to the speed of light is bent by a magnetic field or an electric field, an electromagnetic wave (light) called a radiation is emitted in a tangential direction of an electron orbit.

FIG. 5 shows an example of a radiation light generating means, which comprises a linear accelerator 1 and a synchrotron (electron storage ring) 7.

[0004] The linear accelerator 1 includes an electron generator 2 for emitting electrons (charged particles) e, a straight tubular acceleration duct 3 having one end connected to the electron generator 2, and a movement inside the acceleration duct 3. And a high-frequency accelerator 4 for applying high frequency to the electrons e to accelerate the electrons e.

[0005] The other end of the acceleration duct 3 is connected to one end of a curved tubular deflection duct 5.
A bending electromagnet 6 is provided to bend the trajectory of the electron e moving inside.

The synchrotron 7 has an endless duct 8 for causing the electron e to form a circular orbit. The other end of the deflection duct 5 is connected to a required portion of the endless duct 8. ing.

The bending portion of the endless duct 8 is provided with a deflecting electromagnet 9 for bending the trajectory of the electrons e moving inside the endless duct 8. A high-frequency accelerator 10 is provided for applying a high frequency to the electrons e moving inside and accelerating the electrons e.

A radiation light beam S emitted when the traveling direction of the electrons e moving at a speed close to the speed of light is bent in the curved portion at a required portion of the endless duct 8 is applied to the endless duct 8. One end of a beam line 11 for leading to the outside of the duct 8 is connected, and the other end of the beam line 11 is provided with an experimental device 12 for performing an experiment using the emitted light beam S as an irradiation light source.

Further, at the other end of the beam line 11, a beryllium window (not shown) for keeping the inside of the beam line 11 in a vacuum state is provided.

When the radiation light beam S is emitted by the radiation light generating means shown in FIG. 5, the inside of the acceleration duct 3, the deflection duct 5, the endless duct 8, and the beam line 11 is depressurized to an ultra-high vacuum state. After the state in which the electrons e can move at a speed close to the speed of light, the electrons e are emitted from the electron generator 2.

The electrons e emitted from the electron generator 2 are:
The beam is accelerated by the high-frequency accelerator 4, and further enters the endless duct 8 by being bent by the bending electromagnet 6.

The electron e incident on the endless duct 8 is accelerated by the high-frequency accelerating device 10 and its trajectory is bent at each bending portion by the bending electromagnet 9, whereby the tangent of the trajectory of the electron e to the trajectory of the electron e. A radiation light beam S is emitted in the direction.

A radiation light beam S emitted from a predetermined curved portion of the endless duct 8 enters a test device 12 via a beam line 11.

The emitted light beam S is a divergent light that includes an electromagnetic wave having a wavelength ranging from the visible region to the X-ray region, and spreads in the traveling direction as a light emitting point on the orbit of the electron e orbiting the endless duct 8.

Therefore, when performing an experiment using an electromagnetic wave in a specific wavelength region in the experimental apparatus 12, a spectroscope is incorporated in the beam line 11.

FIGS. 3 and 4 show an example of a conventional spectroscope. This spectroscope is arranged on one side of the optical path of a radiation light beam S which is emitted substantially horizontally, and is arranged with respect to the optical path. A base 13 having a vertical reference surface 13a, a first holder 14 disposed on the other side of the optical path of the emitted light beam S and displaceably attached to a portion of the base 13 near the upstream in the traveling direction of the emitted light beam S; A second holder 15 disposed on one side of the optical path of the light beam S and displaceably attached to a portion of the substrate 13 on the downstream side in the traveling direction of the emitted light beam S, and a crystal surface 16a, 17a for incident light as described below. The first crystal body 16 and the second crystal body 17 that reflect light in a wavelength range corresponding to the angle (Bragg angle θB) are provided.

[0017]

## EQU1 ## nλ = 2d · sin θB θB: Bragg angle d: lattice spacing of crystal λ: wavelength of light n: integer

Between the first holder 14 and the base 13,
A yawing mechanism for swinging the first holder 14 in the left-right α1 direction about a first longitudinal axis Y1 extending vertically along the optical axis O of the radiation light beam S;
A forward / backward movement mechanism for moving in a front-back x1 direction orthogonal to the first longitudinal axis Y1 along the third reference plane 13a;
An elevating mechanism for moving the first holder 14 in the vertical y1 direction along a first vertical axis Y1 and a first horizontal axis X orthogonal to the first vertical axis Y1
A rolling mechanism for tilting the first holder 14 in the left / right direction β1 around the center 1 is interposed, and the first vertical axis Y1 always intersects the optical axis O of the emitted light beam S.

The abdominal surface 14a and the back surface 14b of the first holder 14 located on the optical path side of the radiated light beam S have a swing angle of 0 ° in the left and right α1 direction of the first holder 14 and a right and left β1 direction. When the tilt angle is 0 °, as shown in FIG. 4A, it is formed so as to be parallel to the reference surface 13 a of the base 13.

Between the second holder 15 and the base 13,
A yawing mechanism for swinging the second holder 15 in the left-right α2 direction about a second longitudinal axis Y2 parallel to the first longitudinal axis Y1, and a second holder along the second longitudinal axis Y2. And a second vertical axis Y2 for moving the upper / lower 15 in the vertical y2 direction.
And a rolling mechanism for tilting the second holder 15 in the left and right directions β2 around a second horizontal axis X2 parallel to the first horizontal axis X1.

The abdominal surface 15a and the back surface 15b of the second holder 15 located on the optical path side of the emitted light beam S have a swing angle of 0 ° in the left and right α2 direction of the second holder 15 and a right and left β2 direction. When the tilt angle is 0 °, as shown in FIG. 4A, it is formed so as to be parallel to the reference surface 13 a of the base 13.

In the first crystal body 16, the first vertical axis Y1 is located on the crystal plane 16a, and the crystal plane 16a is
a and is mounted on the first holder 14 so as to be parallel to the rear surface 14b.

In the second crystal body 17, the second vertical axis Y2 is located on the crystal plane 17a and the crystal plane 17a is
a and the second holder 15 so as to be parallel to the rear surface 15b.

Further, the base 13 extends perpendicularly to the optical axis O of the emitted light beam S and is tiltable in the forward and backward γ1 directions about a horizontal axis Z perpendicular to the second longitudinal axis Y2. ing.

Thus, when the base 13 is tilted, the first
The first crystal 16 mounted on the holder 14 and the second crystal 17 mounted on the second holder 15 are displaced about the horizontal axis Z.

When light of a predetermined wavelength range is obtained from the emitted light beam S, the light is controlled by a yawing mechanism, a forward / backward mechanism, an elevating mechanism, and a rolling mechanism interposed between the first holder 14 and the base 13. When the relative position and posture of the first holder 14 with respect to the second holder 15 are adjusted and the position of the first holder 14 with respect to the emitted light beam S is adjusted by tilting the base 13 back and forth about the horizontal axis Z. For example, as shown in FIG. 4B, the emitted light beam S is obliquely incident on the first crystal 16 and moves from the crystal plane 16 a of the first crystal 16 toward the second crystal 17. Bragg angle θ
Light in a wavelength range corresponding to B is emitted.

The crystal plane 17a of the second crystal body 17 is moved to the first crystal plane 17 by a yawing mechanism, a lifting mechanism, and a rolling mechanism interposed between the second holder 15 and the base 13.
When the attitude of the second holder 15 is adjusted so as to be parallel to the crystal plane 16a of the crystal body 16, the reflected light of the first crystal body 16 is obliquely incident on the second crystal body 17, and Crystal 1
The monochromatic light beam S1 in the wavelength region corresponding to the Bragg angle θB is emitted from the crystal plane 17a of the X-ray 7 in parallel with the emitted light beam S.

As shown in FIG. 4C, the Bragg angle θB
Is changed, the yaw mechanism interposed between the first holder 14 and the base 13, the forward / reverse mechanism, the yaw mechanism interposed between the second holder 15 and the base 13, and the front and rear of the base 13 The position of the optical axis P of the monochromatic light beam S1 is kept constant.

Further, in assembling and adjusting the spectroscope, the tilt angle in the front-back γ1 direction about the horizontal axis Z of the base 13 is set to 0 ° so that the vertical axes Y1 and Y2 are vertical, and the first tilt angle is set to 0 °. Is moved to the upstream side of the base 13 in the traveling direction of the emitted light beam S, and the vertical axis Y of the holders 14 and 15 is moved.
Swing angles in the left and right α1 and α2 directions around 1, Y2,
And the tilt angles in the left and right directions β1 and β2 around the horizontal axes X1 and X2 are set to 0 °, and the Bragg angle θB is set to 0 °.
Crystals 16 and 17 are mounted on holders 14 and 15 such that

[0030]

However, in the conventional spectroscope, the Bragg angle θB of both crystals 16 and 17 is set to, for example, 15 ° to 30 ° according to the wavelength range of the light to be obtained from the emitted light beam S. Is set to the first holder 1
4 from the reference position at the time of assembling adjustment toward the second holder 15 and the base 13 is tilted in the forward and backward γ1 directions, and the respective holders 14 and 15 are shifted left and right α1 around the vertical axes Y1 and Y2. It is necessary to swing in the α2 direction. For this reason, there is a concern that the Bragg angle θB may be shifted due to the inclination of the base 13 or the movement of the position of the center of gravity due to the displacement of each member.

The present invention has been made in view of the above circumstances, and has as its object to provide a spectroscope in which the Bragg angle is less likely to shift.

[0032]

In order to achieve the above object, a spectroscope according to the present invention intersects a substrate disposed on a side of an optical path of a radiated light beam emitted substantially horizontally with an optical axis of the radiated light beam. A first holder attached to the base so as to swing right and left around a first vertical axis extending vertically and to move back and forth along the optical path of the emitted light beam; A second holder positioned on the downstream side in the traveling direction of the emitted light beam and swingably mounted on the base so as to be able to swing left and right around a second longitudinal axis parallel to the first longitudinal axis; A first crystal attached to the first holder so as to be capable of oblique incidence and reflecting light in a wavelength region corresponding to the Bragg angle; and light emitted from the first crystal is obliquely incident on the crystal plane. Light in a wavelength range according to the Bragg angle, attached to the second holder so as to obtain And a second crystal body reflecting as a beam, the base and both holders integrally tilting back and forth about a horizontal axis extending perpendicular to the optical axis of the emitted light beam and orthogonal to the second vertical axis. In a spectrometer configured to be capable of performing the above-described operations, the crystal body is set so that the Bragg angle becomes substantially the center value of the setting range at a reference position where the right and left swing angles of each holder with respect to the base are set to 0 °. Is attached to the holder.

In the spectroscope of the present invention, the mounting state of the crystal on each holder is determined by setting the Bragg angle to the reference position where the horizontal swing angle of the holder with respect to the base is set to 0 °. When the Bragg angle is changed to the maximum value or the minimum value of the set range, the amount of movement of the first holder in the front-rear direction with respect to the reference position, and in the left-right direction of both holders with respect to the reference position. Swing amount of
In addition, the amount of tilt of the base in the front-rear direction about the horizontal axis is reduced.

[0034]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an example of an embodiment of the spectroscope of the present invention. This spectroscope is arranged on one side of the optical path of a radiation light beam S which is emitted substantially horizontally, and is connected to the optical path. A base 18 having a reference surface 18a perpendicular to the base 18 and a first holder 19 disposed on the other side of the optical path of the emitted light beam S and displaceably attached to a portion of the base 18 near the upstream in the traveling direction of the emitted light beam S. A second holder 20 disposed on one side of the optical path of the emitted light beam S and displaceably attached to a portion of the substrate 18 on the downstream side in the traveling direction of the emitted light beam S, and a wavelength region corresponding to the Bragg angle θB with respect to the incident light. A first crystal body 21 and a second crystal body 22 that reflect the light.

Between the first holder 19 and the base 18,
A yawing mechanism for swinging the first holder 19 in the left-right α1 direction about a first longitudinal axis Y1 extending vertically along the optical axis O of the radiation light beam S;
A forward / backward movement mechanism for moving in a front-rear x1 direction orthogonal to the first longitudinal axis Y1 along the reference plane 18a of the first and the second longitudinal axes Y;
An elevating mechanism for moving the first holder 19 in the vertical y1 direction along a first horizontal axis X and a first horizontal axis X orthogonal to the first vertical axis Y1
A rolling mechanism for tilting the first holder 19 in the left and right directions β1 around the center 1 is interposed, and the first vertical axis Y1 always intersects the optical axis O of the emitted light beam S.

As shown in FIG. 2A, when the first holder 19 has a swing angle of 0 ° in the left and right α1 direction and a tilt angle of 0 ° in the left and right β1 direction, as shown in FIG. 1 holder 1
9 so that the abdominal surface 19a located on the optical path side of the radiation light beam 9 forms an angle of 15 ° with the reference surface 18a of the base 18 and the back surface 19b is parallel to the reference surface 18a of the base 18. Is formed.

Between the second holder 20 and the base 18,
A yawing mechanism for swinging the second holder 20 in the left-right α2 direction about a second longitudinal axis Y2 parallel to the first longitudinal axis Y1, and a second holder along the second longitudinal axis Y2 An elevating mechanism for moving the actuator 20 in the vertical y2 direction, and a second vertical axis Y2
And a rolling mechanism for tilting the second holder 20 in the left-right direction β2 around a second horizontal axis X2 parallel to the first horizontal axis X1.

When the swing angle in the left and right α2 direction is 0 ° and the tilt angle in the right and left β2 direction is 0 °, the second holder 20, as shown in FIG. 2 holder 2
The abdominal surface 20a located on the optical path side of the zero emitted light beam S forms an angle of 15 ° with the reference surface 18a of the base 18, and the back surface 20b is parallel to the reference surface 18a of the base 18. Is formed.

The first crystal body 21 is positioned such that the first vertical axis Y1 is positioned on the crystal plane 21a and the first holder 19
Is set to 0 ° in the left / right α1 direction about the first vertical axis Y1 and the tilt angle in the left / right β1 direction about the first horizontal axis X1 is set to 0 °. At the reference position, the Bragg angle θB of the emitted light beam S with respect to the optical axis O is 15 °
It is mounted on the first holder 19 so as to be (median value when the setting range of the Bragg angle θB is 0 ° to 30 °).

The second crystal body 22 is positioned such that the first vertical axis Y2 is positioned on the crystal plane 22a.
Is set at 0 ° in the left-right α2 direction about the second vertical axis Y2, and is set at 0 ° in the left-right β2 direction about the second horizontal axis X2. At the reference position, the second angle is set so that the Bragg angle θB with respect to the light emitted from the first crystal body 21 is 15 ° (median value when the setting range of the Bragg angle θB is 0 ° to 30 °). It is mounted on the holder 20.

Further, the base 18 extends perpendicular to the optical axis O of the radiated light beam S and can be tilted in the forward and backward γ1 directions about a horizontal axis Z orthogonal to the second vertical axis Y2. ing.

Thus, when the base 18 is tilted, the first
The first crystal body 21 mounted on the holder 19 and the second crystal body 22 mounted on the second holder 20 are displaced about the horizontal axis Z.

When light of a predetermined wavelength range is obtained from the radiated light beam S, the light is controlled by a yawing mechanism, a forward / backward mechanism, an elevating mechanism, and a rolling mechanism interposed between the first holder 19 and the base 18. When the relative position and orientation of the first holder 19 with respect to the second holder 20 are adjusted, and the position of the first holder 19 with respect to the emitted light beam S is adjusted by tilting the base 18 back and forth about the horizontal axis Z. As shown in FIGS. 2A, 2B, and 2C, the radiation light beam S is obliquely incident on the first crystal body 21 and is shifted from the crystal plane 21a of the first crystal body 21 to the second crystal body. The light in the wavelength region corresponding to the Bragg angle θB is emitted toward 22.

The crystal plane 22a of the second crystal body 22 is moved to the first crystal plane 22 by a yawing mechanism, a lifting mechanism, and a rolling mechanism interposed between the second holder 20 and the base 18.
When the attitude of the second holder 20 is adjusted so as to be parallel to the crystal plane 21a of the crystal body 21, the reflected light of the first crystal body 21 obliquely enters the second crystal body 22, and Crystal 2
A monochromatic light beam S1 in a wavelength region corresponding to the Bragg angle θB is emitted from the second crystal plane 22a in parallel with the radiation light beam S.

In the spectroscope shown in FIGS. 1 and 2, the mounting state of the crystal bodies 21 and 22 to the holders 19 and 20 is as follows.
At the reference position where the swing angles of the holders 19 and 20 with respect to the base 18 in the left and right directions α1 and α2 are set to 0 °, the Bragg angle θB is set to 15 ° which is the median of the set range. , Set the Bragg angle θB to the maximum value of the setting range 3
When the angle is changed to 0 ° or the minimum value 0 °, the amount of movement of the first holder 19 in the front-back x1 direction and the amount of swing in the left-right α1 direction with respect to the reference position, and the left-right α2 direction of the second holder 20 with respect to the reference position And the amount of tilt of the base 18 about the horizontal axis Z in the front-back γ1 direction is reduced, and the Bragg angle θB is less likely to shift.

It should be noted that the present invention is not limited to only the above-described embodiment, and it goes without saying that changes can be made without departing from the spirit of the present invention.

[0048]

As described above, according to the spectroscope of the present invention, the mounting state of the crystal on each holder is determined based on the criterion for setting the horizontal swing angle of the holder with respect to the base to 0 °. At the position, the Bragg angle is set to be approximately the center value of the set range, so that when the Bragg angle is changed to the maximum value or the minimum value of the set range, the first position relative to the reference position.
The amount of movement of the holder in the front-rear direction and the amount of swing in the left-right direction, the amount of swing of the second holder in the left-right direction with respect to the reference position, and the amount of tilt of the base about the horizontal axis in the front-rear direction are reduced. An excellent effect that the Bragg angle is less likely to shift can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a spectroscope of the present invention.

FIG. 2 is a plan view showing the relationship between the position of a crystal and a holder in FIG. 1 and the Bragg angle.

FIG. 3 is a perspective view showing an example of a conventional spectroscope.

FIG. 4 is a plan view showing the relationship between the position of the crystal and holder in FIG. 3 and the Bragg angle.

FIG. 5 is a conceptual diagram illustrating an example of a radiation light generating unit.

[Explanation of symbols]

 Reference Signs List 18 base 19 first holder 20 second holder 21 first crystal 21a crystal plane 22 second crystal 22a crystal plane O optical axis S radiation light beam S1 monochromatic light beam X1 first horizontal axis Y1 first Vertical axis Y2 second vertical axis Z horizontal axis θB Bragg angle

Claims (1)

[Claims] 1. A base disposed on the side of an optical path of a radiation light beam emitted substantially horizontally, and capable of swinging left and right about a first vertical axis which extends vertically up and down across the optical axis of the radiation light beam. A first holder attached to the base so as to be movable back and forth along the optical path of the emitted light beam, and a first holder which is located downstream of the first holder in the traveling direction of the emitted light beam and parallel to the first longitudinal axis. A second holder attached to the base so as to be able to swing left and right about a second vertical axis, and mounted on the first holder so that the radiated light beam can be obliquely incident on the crystal plane and according to the Bragg angle. Crystal body that reflects light in the wavelength region, and a wavelength region that is mounted on the second holder and that corresponds to the Bragg angle so that light emitted from the first crystal body can obliquely enter the crystal plane. And a second crystal body that reflects the light as a monochromatic light beam. In a spectroscope configured so that the base and both holders can be integrally tilted back and forth about a horizontal axis that extends at right angles to the base and that is orthogonal to the second vertical axis, the right and left swing of each holder with respect to the base is provided. A spectroscope characterized in that a crystal is mounted on a holder such that a Bragg angle is substantially at a center value of a set range at a reference position where a moving angle is set to 0 °.