Diaphragm

Abstract

The utility model relates to a diaphragm, which comprises a shell, the shell is provided with a light passing port, the light passing port penetrates through a first side of the shell and a second side opposite to the first side along the X direction, the first side of the shell is fixedly provided with a light blocking assembly, and the light blocking assembly is located above the light passing port in the Z direction. And the light passing port is used for allowing the first-stage diffraction light and the powder light from the plane grating monochromator to pass through. The diaphragm provided by the utility model not only can block 0-level diffracted light emitted from the plane grating monochromator, but also can enable 1-level diffracted light and pin light to pass through.

Description

Technical Field

[0001] The utility model relates to the technical field of optical elements, and more specifically to an aperture, which is used for blocking grating 0th order diffraction light behind a plane grating monochromator and allowing grating 1st order diffraction light and pink light (i.e., pink light) to pass through. Background Art

[0002] The Hard X-ray Free Electron Laser (SHINE) facility features high brightness, ultrashort pulses, full coherence, high repetition rate, and a wide energy range. The initial phase of the project will consist of three beamlines and ten experimental stations, which will have nanometer-level ultrahigh spatial resolution and femtosecond-level ultrafast temporal resolution. SHINE's beamline repetition rate can reach 1MHz, with total power and peak power density reaching 2.1kW and 253.1W / urad, respectively. 2 , high power and high peak power density put forward higher requirements on the structure of the aperture.

[0003] The plane grating monochromator can be dimmed by switching the grating to meet the light requirements of the user's experimental station. By switching different gratings, the corresponding photon energy beam can be diffracted into beams of different angles, including 0th order diffraction light, 1st order diffraction light, and pink light.

[0004] In some applications, only the first-order diffraction light and pink light are usually required, but the zero-order diffraction light is not required. The existing aperture cannot achieve this function. Therefore, there is an urgent need in this field to provide an aperture for blocking the zero-order diffraction light and allowing the first-order diffraction light and pink light to pass through. Utility Model Content

[0005] The utility model aims to provide an aperture to block the 0th order diffraction light emitted from a plane grating monochromator and allow the 1st order diffraction light and pink light to pass through.

[0006] Based on the above-mentioned purpose, the utility model provides an aperture, including a shell, the shell having a light opening, the light opening passing through a first side of the shell and a second side opposite to the first side along the X-direction, a light blocking component is fixed to the first side of the shell, the light blocking component is located above the light opening in the Z-direction to block the 0th order diffraction light from the plane grating monochromator, and the light opening is used to allow the 1st order diffraction light and pink light from the plane grating monochromator to pass through.

[0007] Furthermore, the light blocking assembly includes multiple diamond pieces stacked in sequence along the Z direction.

[0008] Furthermore, the diamond is square.

[0009] Furthermore, any two adjacent diamonds have an overlapping area of ​​at least 1 mm along the Z direction.

[0010] Furthermore, the diamond closest to the light opening covers an area of ​​at least 1 mm of the light opening along the Z direction.

[0011] Furthermore, a groove is provided on the first side of the shell, and each diamond is located in the groove.

[0012] Furthermore, each diamond is pressed into the groove by two pressing plates, and the pressing plates are fixedly connected to the housing and in close contact with the diamond.

[0013] Furthermore, a graphite sheet is placed between the diamond and the shell.

[0014] Furthermore, a fluid passage is provided inside the shell, and the fluid passage has an inlet pipe and an outlet pipe, at least parts of the inlet pipe and the outlet pipe extend outside the shell, the inlet pipe is used for cooling fluid to pass through, and the outlet pipe is used for cooling fluid to flow out.

[0015] Furthermore, the shell is formed in a flange shape, and a back knife groove is provided on the second side of the shell; the back knife groove and the light opening are offset from the center of the shell.

[0016] The aperture of the utility model can block the 0th order diffraction light from the plane grating monochromator through the light blocking component, while the 1st order diffraction light and pink light of the plane grating monochromator can pass through the light opening, thereby blocking the 0th order diffraction light and allowing the 1st order diffraction light and pink light to pass through; the light blocking component is formed by stacking multiple pieces of golden light stones, which can reduce manufacturing costs; the shell is formed in a flange shape, which can be convenient for connecting vacuum pipes and reduce space occupancy; the light opening can be deviated from the center of the shell to effectively utilize the area of ​​the shell and avoid the shell being too large. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view of the front view of the aperture according to an embodiment of the present invention;

[0018] Figure 2 is a three-dimensional diagram of the back view of the aperture according to an embodiment of the present invention;

[0019] Figure 3 A perspective view of a diaphragm according to an embodiment of the present invention from a front perspective;

[0020] Figure 4 is a front view of an aperture according to an embodiment of the present utility model;

[0021] Figure 5 for Figure 4 AA cross-sectional view. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings and described in detail.

[0023] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, an embodiment of the present invention provides an aperture, which includes a shell 100, the shell 100 has a light opening 110, the light opening 110 passes through a first side 120 of the shell 100 along the X direction and a second side 130 opposite to the first side along the X direction, wherein the first side 120 is a side close to the plane grating monochromator (that is, the front side of the aperture), and the second side 130 is a side away from the plane grating monochromator (that is, the back side of the aperture). A light blocking component 200 is fixed to the first side 120 of the shell 100, and the light blocking component 200 is located above the light opening 110 in the Z direction, and is used to block the 0th order diffraction light emitted from the plane grating monochromator. When in use, the aperture is located downstream of the plane grating monochromator and at a certain distance from the outlet of the plane grating monochromator. The light opening 110 of the aperture deviates from the outlet of the plane grating monochromator (for example, it can be located about 7 mm downward from the center of the monochromator) so that the first-order diffraction light and the pink light can pass through. The outlet of the monochromator is aligned with the center of the light source (i.e., the center of the first-order diffraction light). When the 0th-order diffraction light emitted from the outlet of the plane grating monochromator reaches the aperture, it will produce a certain angle and deviate from the light opening 110 and illuminate the light blocking component 200. It can be blocked by the light blocking component 200, so that it cannot pass through the aperture and be transmitted to the downstream of the aperture. The first-order diffraction light and the pink light of the plane grating monochromator will not have an angular deviation, so they can pass through the light opening 110 and reach the downstream of the aperture.

[0024] In some embodiments, the light blocking assembly 200 includes multiple diamonds 210 stacked in sequence along the Z direction. The diamonds 210 can block the zero-order diffracted light of the monochromator and prevent it from passing through. The thickness of each diamond 210 can be set to 1 mm, which can reduce costs and prevent the zero-order diffracted light from passing through.

[0025] In some embodiments, the shape of the diamond 210 can be rectangular, so that the light blocking assembly 200 formed by the diamonds 210 covers a larger area, i.e. has a larger light blocking range. There is at least 1mm of overlapping area between any two adjacent diamonds 210 in the Z direction to avoid light leakage. Since the diamonds produced by the chemical deposition process are circular, the square diamonds need to be cut out of the circular diamonds. If the light blocking assembly 200 is a whole square diamond, the size is large, which will result in a large amount of diamond waste after cutting, and high cost. The light blocking assembly 200 of the utility model is formed by stacking multiple small-size diamonds, so it can be obtained by cutting small-size circular diamonds, thereby reducing the cost (the cost can be reduced by more than 50%).

[0026] In some embodiments, the diamond 210 closest to the light passage opening 110 covers an area of at least 1mm of the light passage opening 110 in the Z direction to prevent 0-order diffracted light from passing through.

[0027] In some embodiments, the first side 120 of the shell 100 is provided with a groove 140, and each diamond 210 is located in the groove 140. Each diamond 210 is pressed in the groove 140 by two pressing pieces 220, wherein the pressing pieces 220 are fixedly connected with the shell 100, and the pressing pieces 220 are in close contact with the diamond 210, so that the diamond 210 is fixed in the groove 140. The two pressing pieces 220 can be oppositely arranged along the Y direction and press the Y direction two sides of the diamond 210 respectively, so that the diamond 210 can be stably fixed in the groove 140. The pressing piece 220 can be fixed with the shell 100 by screwing.

[0028] In some embodiments, a graphite sheet 230 can be interposed between the inner side of the diamond 210 (i.e. the side away from the monochromator) and the shell 100 to improve the heat dissipation capacity.

[0029] In some embodiments, the shell 100 is internally provided with a fluid passage 300, and the fluid passage 300 has an inlet pipe 310 and an outlet pipe 320. At least part of the inlet pipe 310 and the outlet pipe 320 extends out of the shell 100 for the entry and exit of fluid. Specifically, cooling fluid (such as water, liquid nitrogen, etc.) can be introduced into the fluid passage 300 from the inlet pipe 310, and the cooling fluid flows in the fluid passage 300 and flows out from the outlet pipe 320, so that the interior of the shell 100 can be cooled by the cooling fluid to avoid damage due to excessive temperature. The fluid passage 300 can be as extensive as possible in the area covered by the light blocking assembly 200 in the shell 100, so as to cool the area where the light blocking assembly 200 is located. The inlet pipe 310 and the outlet pipe 320 can be respectively connected with a fluid supply device to realize the circulation of fluid.

[0030] In some embodiments, a back knife slot 140 can be provided on the second side 130 of the shell 100 for fixing with the vacuum pipeline downstream of the diaphragm. The back knife slot 140 is coaxially arranged with the monochromator outlet, the back knife slot 140 is formed in a circular shape and surrounds the light passing port 110. The light passing port 110 and the back knife slot 140 are arranged offset from the center of the shell 100 to improve the effective utilization area of the shell 100 and avoid the size of the shell 100 being too large.

[0031] The structure size of the diaphragm can be ensured to meet the requirements of light blocking and light passing through the method of optical tracing. Taking the hard X-ray free electron laser device FEL-II as an example, the 0-order diffraction light and the 1-order diffraction light are in the same center, and when the photon energy is 2keV, the angle of the 0-order diffraction light is 7mrad, and the angle of the 1-order diffraction light is 0. The 0-order diffraction light and the 1-order diffraction light need to be distinguished at a position of about 3.5m behind the monochromator, at this time the center distance of the two light beams is 24.5mm, and considering the influence of the spot size, the edge distance of the 0-order diffraction light and the 1-order diffraction light is about 8mm, which can achieve the purpose of light splitting; when the photon energy is 0.2keV, the maximum angle of the 0-order diffraction light is 56mrad, at this time the distance of the 0-order diffraction light deviating from the center at 3.5m is 196mm, and the limit distance after considering the spot size is 200mm, therefore the range of the 0-order diffraction light is 27mm-200mm, and the height along the Z direction is 173mm, so the light blocking area of the light blocking assembly 200 can be set as 30mm*186mm, that is, the width along the Y direction is 30mm and the height along the Z direction is 186mm, thereby the 0-order diffraction light can be completely blocked; the size of the light passing port 110 is set as 30mm*50mm, that is, the width along the Y direction is 30mm and the height along the Z direction is 50mm.

[0032] In some embodiments, the shell 100 can be formed in the shape of a flange so as to be fixedly connected with the vacuum pipeline upstream, avoiding occupying space. The material of the shell 100 can be chromium zirconium copper.

[0033] The diaphragm of the embodiment of the utility model, the 0-order diffraction light from the plane grating monochromator can be blocked by the light blocking assembly 200, and the 1-order diffraction light and pink light of the plane grating monochromator can pass through the light passing port 110, so that the 0-order diffraction light can be blocked and the 1-order diffraction light and pink light can pass through; the light blocking assembly 200 is formed by stacking a plurality of gold light stones 210, which can reduce the manufacturing cost; the shell 100 is formed in the shape of a flange, which can facilitate the connection of the vacuum pipeline and reduce the space occupation; the light passing port 110 can be offset from the center of the shell 100 to effectively utilize the area of the shell 100 and avoid the size of the shell 100 being too large.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Various modifications are possible to the above embodiments of the present invention. In other words, any simple, equivalent changes and modifications made in accordance with the claims and description of the present invention fall within the scope of protection of the present invention. Anything not fully described in this invention represents conventional technology.

Claims

1. A diaphragm, characterized in that: The invention comprises a shell having a light opening, wherein the light opening passes through a first side of the shell and a second side opposite to the first side along the X direction; a light blocking component is fixed to the first side of the shell, and the light blocking component is located above the light opening in the Z direction to block the 0th order diffraction light from the plane grating monochromator; the light opening is used to allow the 1st order diffraction light and pink light from the plane grating monochromator to pass through.

2. The diaphragm according to claim 1, characterized in that The light blocking component includes a plurality of diamonds stacked in sequence along the Z direction.

3. The diaphragm according to claim 2, characterized in that The diamond is square.

4. The diaphragm according to claim 2, characterized in that Any two adjacent diamonds have an overlapping area of ​​at least 1 mm along the Z direction.

5. The diaphragm according to claim 2, characterized in that The diamond closest to the light opening covers an area of ​​at least 1 mm of the light opening along the Z direction.

6. The diaphragm according to claim 2, characterized in that A groove is provided on the first side of the housing, and each diamond is located in the groove.

7. The diaphragm according to claim 6, characterized in that Each diamond is pressed into the groove by two pressing sheets, and the pressing sheets are fixedly connected to the shell and in close contact with the diamond.

8. The diaphragm according to claim 2, characterized in that A graphite sheet is placed between the diamond and the shell.

9. The diaphragm according to claim 1, wherein A fluid passage is provided inside the shell, and the fluid passage has an inlet pipe and an outlet pipe. At least parts of the inlet pipe and the outlet pipe extend outside the shell. The inlet pipe is used for cooling fluid to enter, and the outlet pipe is used for cooling fluid to flow out.

10. The diaphragm according to claim 1, wherein The housing is formed in a flange shape, and a back knife groove is provided on the second side of the housing; the back knife groove and the light opening are offset from the center of the housing.

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