Simple fluorescent target device

Abstract

The application discloses a simple fluorescent target device, characterized in that the device comprises a target sheet, a bellows welding assembly, a driving and guiding component and an imaging system; the target sheet is installed on a target seat of the bellows welding assembly; the driving and guiding component is used for compressing or stretching the bellows of the bellows welding assembly to feed or let out the target sheet in a light path; the bellows welding assembly comprises a bellows, a supporting plate, an imaging system mounting plate, a sliding table connecting welding lug and the target seat; the target seat is arranged inside the bellows and is welded with an upper flange of the bellows, is hollow and has an inner diameter greater than that of a light spot of a beam current, and a lower edge is in a bevel shape and is provided with a hole for beam current incidence; the supporting plate is welded to an outer edge of a lower loose sleeve flange of the bellows; the driving and guiding component is installed on the supporting plate and is connected with the sliding table connecting welding lug installed on an outer edge of the upper flange; and the imaging system is used for receiving fluorescent signals emitted when the beam current hits the target surface. The application has high integration and can be conveniently installed on a cavity flange of an optical equipment such as a mirror box or a monochromator.

Description

Technical Field

[0001] This invention belongs to the field of synchrotron radiation technology and relates to a simple fluorescent target device, which is applied to the beamline of a synchrotron radiation device and used in a high vacuum environment. Background Technology

[0002] A ring synchrotron radiation source mainly consists of a storage ring, a bending magnet, inserts in the long straight section, a beamline, and experimental stations. Inserts are periodic magnetic field elements installed in the long straight section of the storage ring; typical types include wavelength shifters, multipole oscillators, and undulators. They generate more concentrated, high-brightness, or specific polarization-state synchrotron radiation by applying a periodic transverse magnetic field to the electron beam, causing the electrons to oscillate transversely. To conduct various types of scientific experiments, synchrotron radiation needs to be modulated to meet experimental requirements. Since synchrotron radiation beam modulation involves various optical devices such as apertures, white light mirrors, deflectors, and monochromators, beam detection technology is essential for the operation of synchrotron radiation facilities, especially for beam modulation. Beam modulation is a crucial step in the operation of a synchrotron radiation facility, directly affecting beam output efficiency and beam quality, and consequently, the progress and results of experiments in physics, biology, and other fields. Commonly used beam detectors include BPM (Beam Position Monitor), wire scanning detectors, synchrotron radiation imaging detectors, and fluorescent targets. BPMs can only measure beam position and intensity distribution, while wire scanning detectors, imaging detectors, and fluorescent targets can measure beam position, beam cross-sectional shape, and intensity distribution. Compared to other beam detectors, fluorescent targets not only directly provide information such as beam cross-sectional shape and intensity distribution, but also have simple structures and are easy to implement, making them the most commonly used beam detector in the beam modulation stage. A fluorescent target consists of a scintillator material and an imaging system. During the synchrotron radiation beam modulation stage, when parameters such as beam cross-sectional shape and intensity distribution need to be measured, a mechanical structure feeds the fluorescent target into the beam path. When the beam hits the fluorescent target surface, it generates visible fluorescence. The imaging system then acquires the fluorescence signal on the target surface, and beam parameters are obtained through beam image analysis. After beam modulation is complete, the fluorescent target needs to be removed from the optical path so that the beam can smoothly reach the downstream experimental station. In addition, to avoid strong absorption of synchrotron radiation by the atmosphere and the carbonization of the scintillator in the atmosphere, the fluorescent target scintillator material is generally required to be placed in an ultra-high vacuum environment, and its structure is as follows: Figure 1 As shown.

[0003] The aforementioned fluorescent target is a feed structure, with its scintillator and target holder components placed inside a vacuum cavity. The main structure includes the fluorescent target body feed structure 01, the vacuum cavity 02, and the imaging system 03.

[0004] like Figure 2 The diagram shows the fluorescent target body feeding structure 01 inside the vacuum chamber of the fluorescent target. The main structure includes a drive cylinder 101, a guide rod 102, an upper limit position 103, a connecting joint 104, a bellows assembly 105, a lower limit position 106, a target holder 107, a scintillator target 108, and other supporting and connecting elements. The scintillator target 108 is fixed to the target holder 107 and then mounted on the flange of the bellows assembly 105. It is connected to the drive cylinder 101 via the connecting joint 104, thus achieving telescopic movement in an isolated atmospheric and vacuum environment. The bellows assembly 105 and the guide rod 102 are fitted together to achieve guided movement along a fixed track. The upper limit position 103 and the lower limit position 106 are used to limit the range of motion and to determine the insertion and removal status of the optical path.

[0005] like Figure 3 The diagram shows the fluorescence target vacuum chamber 02, used to mount and support the fluorescence target body feed structure 01 and provide it with an ultra-high vacuum environment. The main structure includes an upper flange 201, a vacuum gauge connector 202, a main chamber 203, a mounting base 204, a lower flange 205, a target holder 206, a beam inlet / outlet flange 207, a spare flange 208, an observation window 209, and an imaging system support base 210. The upper flange 201 serves as the mounting flange for the fluorescence target body feed structure 01, providing support and connection. The vacuum gauge connector 202 is used to mount a vacuum gauge for easy monitoring of the vacuum chamber pressure. The main chamber 203 serves as the welding body for connecting various connectors and providing an ultra-high vacuum environment. The mounting base 204 is welded to the main chamber 203 and serves as the connection between the chamber and the support. The lower flange 205 is used to connect an ion pump or a spare flange. The reference base 206 is used for calibration and collimation. The beam inlet / outlet flange 207 connects upstream and downstream equipment, serving as the beam path. The spare flange 208 is used to install components such as observation windows or angle valves, serving as a backup interface. The observation window 209 serves as a fluorescence image transmission channel on the scintillator target 108, allowing fluorescence to pass through to the imaging system while isolating it from vacuum and atmosphere. The imaging system support 210 is used to mount the imaging system 03 and to receive and transmit fluorescence images.

[0006] Although the aforementioned fluorescent target detector can acquire and measure parameters such as beam spot cross-sectional shape and intensity distribution, the overall equipment occupies a large space, including components such as cavities and supports. It needs to be installed and used as a complete set of equipment, which is complicated to install and maintain, and has high design and manufacturing costs. Summary of the Invention

[0007] To address the problems existing in the prior art, the present invention aims to provide a simplified fluorescence target device. This invention can convert synchrotron radiation beams into fluorescent visible light, and can feed / yield light paths according to dimming requirements. It features high integration and can be easily installed on the flange of optical equipment such as mirror boxes / monochromators.

[0008] The technical solution of this invention is as follows: A simplified fluorescent target device, characterized in that it includes a target sheet, a bellows welding assembly, a drive and guide component, and an imaging system; The target plate is mounted on the target holder of the bellows welding assembly; The drive guide component is used to compress or stretch the bellows of the bellows welding assembly to feed the target into or clear the optical path. The bellows welding assembly includes a bellows, a support plate, an imaging system mounting plate, a sliding stage connecting welding lug, and a target base. The target base is placed inside the bellows and welded to its upper flange. It is hollow inside with an inner diameter larger than the beam spot size, and its lower edge is beveled with holes for beam injection. The support plate is welded to the outer edge of the lower loose flange of the bellows. The drive guide component is mounted on the support plate and connected and fixed to the sliding stage connecting welding lug mounted on the outer edge of the upper flange. The imaging system mounting plate is mounted on the outer edge of the upper flange. The imaging system is used to receive the fluorescence signal emitted when the beam hits the target surface of the target sheet when the target sheet is fed into the optical path.

[0009] Preferably, the cut surface of the lower edge is at 45° to the beam injection direction; the target sheet is pressed and attached to the cut surface by a clamping block.

[0010] Preferably, the target seat passes through the bellows and is welded to the inner wall of the upper welding flange thereon, and the target seat is coaxial with the upper welding flange of the bellows; the support plate is welded to the outer edge of the lower loose flange of the bellows, and the welding surface does not exceed the sealing surface; the sliding table connecting welding lug is welded to the outer edge of the upper welding flange of the bellows, parallel to the upper welding flange, and on the same side as the support plate.

[0011] Preferably, the drive and guide component includes a motor, a coupling, a lead screw assembly, two guide rails, and a mounting plate; the output shaft of the motor is connected to the input end of the lead screw assembly through the coupling to convert rotary motion into linear motion; the two guide rails are arranged on both sides of the lead screw assembly, the bearing seats at both ends of the lead screw assembly are fixed to the inner machined surface of a support plate, the two guide rails are fixed to the stepped surfaces on both sides of the inner machined surface of the support plate, and the mounting plate is mounted on the lead screw nut mounting surface of the lead screw assembly and the slider mounting surface of the guide rails.

[0012] Preferably, the coupling is placed inside a coupling protective cover and connects the extended shaft of the motor and the floating end extended shaft of the lead screw assembly; the coupling protective cover is connected to the motor support plate and fixed to the cantilever side of the support plate.

[0013] Preferably, the sliding table connecting welding lug is connected and fixed to the mounting plate via a connecting plate.

[0014] Preferably, the imaging system mounting plate is provided with elongated slotted screw holes for adjusting the object distance between the imaging system and the target.

[0015] Preferably, the imaging system mounting plate is mounted on the upper welded flange of the bellows, opposite to the connecting weld lugs of the slide table.

[0016] Preferably, the imaging system includes a camera and a lens. An observation window is provided between the imaging system and the corrugated pipe welding assembly. The camera is mounted on the imaging system mounting plate via a cantilever structure bracket, so that the lens faces the observation window and is coaxially mounted with it.

[0017] Preferably, the target sheet is a scintillator crystal material.

[0018] The simplified fluorescent target device of this invention is an important detection component in the beam-tuning stage of synchrotron radiation beamlines. It can be directly integrated into important optical components of the beamline, such as mirror boxes and monochromator cavities. It can monitor low-heat-loaded powder light and monochromatic light after being modulated by various optical mirrors, lenses and monochromators, and can adapt to different output beam currents within a certain range. It can accurately analyze the beam spot size and distribution state to provide feedback on beam modulation requirements, adjust the beam current to a state suitable for experimental needs, and improve the beam-tuning efficiency and beam quality.

[0019] The advantages of this invention are mainly as follows: First, it is a modular device with strong adaptability, and can be directly installed as an add-on on the spare window of optical equipment such as the monochromator in the mirror box. Second, the imaging system is directly integrated into the device, eliminating the need for additional cavities and supports, resulting in low maintenance costs. Third, the fixed distance between the imaging system and the target film enables various beam spot diagnoses. Attached Figure Description

[0020] Figure 1 This is a diagram of a traditional fluorescent target structure.

[0021] Figure 2 This is a diagram of the main feed structure of a traditional fluorescent target.

[0022] Figure 3 This is a diagram of the vacuum cavity structure of a traditional fluorescent target.

[0023] Figure 4 This is a structural diagram of the conveniently installed fluorescent target device of the present invention.

[0024] Figure 5 This is a schematic diagram of the target mounting position. Detailed Implementation

[0025] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0026] One embodiment of the present invention provides a simplified fluorescent target device, mainly comprising a drive and guide component, a bellows welding assembly, a target sheet and a clamping block, an imaging system, and other mechanisms. The target sheet is mounted on a target holder, and the drive and guide component compresses and stretches the bellows to achieve its feeding and clearing of the optical path. When the optical path is fed in, the beam hits the target surface, emits a fluorescent signal, and transmits it to the imaging system, thereby achieving the purpose of beam interception and detection.

[0027] The drive and guide components include a motor, a coupling, a lead screw assembly, a pair of guide rails, and a mounting plate. The motor output shaft is connected to the lead screw input end via the coupling, converting rotational motion into linear motion. The pair of guide rails are arranged on both sides of the lead screw assembly. The mounting plate is connected and fixed to the sliders on the guide rails and the lead screw nut of the lead screw assembly via screws. All of the above components are mounted on the L-shaped support plate described below, forming a slide-like assembly.

[0028] The bellows welding assembly includes a bellows, an L-shaped support plate, an imaging system mounting plate, a sliding table connecting welding lug, and an oxygen-free copper cylindrical target holder. The upper flange of the bellows is a welded flange, and the lower flange is a loose flange. The oxygen-free copper cylindrical target holder is placed inside the bellows and welded to its upper flange. It is hollow inside with an inner diameter larger than the beam spot size, and its lower edge is beveled at a 45° angle to the beam inlet direction, with a circular hole to allow beam inlet. The L-shaped support plate is welded to the outer edge of the lower loose flange of the bellows. The aforementioned drive guide component is mounted on the L-shaped support plate and connected and fixed to the sliding table connecting welding lug welded to the outer edge of the upper flange of the bellows via a connector. The imaging system mounting plate is welded to the outer edge of the upper flange of the bellows, opposite the sliding table connecting welding lug.

[0029] The imaging system includes a camera and a lens. An observation window is located between the imaging system and the bellows welding assembly. The observation window's blade side is connected to its mating bellows flange, and a vacuum seal is achieved by pressing a metal sealing gasket. The camera is mounted on the imaging system mounting plate via a cantilever bracket, with the lens facing the observation window and coaxially mounted with it.

[0030] The target sheet is a scintillator crystal material, generally a transparent polycrystalline diamond sheet or a YAG:Ce sheet (cerium-doped yttrium aluminum garnet crystal). The specific selection depends on the beam properties. The target sheet is pressed and attached to the 45-degree cut surface of the oxygen-free copper cylindrical target holder by a clamping block. After the beam is irradiated onto the target sheet, the fluorescence signal on the back of the target sheet is received by the imaging system.

[0031] To facilitate understanding of the key technologies of this invention, a specific embodiment is described below: like Figure 4 , Figure 5 The illustrated embodiment of the present invention is a conveniently mounted fluorescent target device, which mainly includes a lead screw assembly 1, an imaging system 2, a camera bracket 3, an observation window 4, an imaging system mounting plate 5, a bellows 6, an oxygen-free copper hollow target base 7, a clamping block 8, an L-shaped support plate 9, a slide table connecting welded lug 10, a connecting plate 11, a mounting plate 12, a guide rail assembly 13, a motor support plate 14, a coupling protective cover 15, a coupling 16, a motor 17, and a target plate 18.

[0032] The imaging system mounting bracket 5, oxygen-free copper hollow target holder 7, L-shaped support plate 9, and sliding table connecting welding lug 10 described above are all welded to the bellows 6. The oxygen-free copper hollow target holder 7 passes through the bellows 6 and is welded to the inner wall of the welding flange on it. During welding, it is necessary to follow the requirements of ultra-high vacuum welding and process tooling to maintain the coaxiality of the oxygen-free copper hollow target holder 7 and the welding flange on the bellows 6. The L-shaped support plate is welded to the outer edge of the lower loose flange of the bellows 6, and the welding surface does not exceed the sealing surface. The lower loose flange of the bellows should be able to rotate smoothly but should not come off its shoulder ring. The sliding table connecting welding lug 10 is welded to the outer edge of the welding flange on the bellows 6, keeping it parallel to the upper welding flange, and its direction is on the same side as the L-shaped support plate 9. The imaging system mounting bracket 5 is welded to the outer edge of the welding flange on its bellows 6, and its direction is on the opposite side of the L-shaped support plate 9.

[0033] The aforementioned coupling protective cover 15 is screwed onto the motor support plate 14 and fixed to the cantilever side of the L-shaped support plate 9. The coupling 16 is placed inside the coupling protective cover 15, connecting the extension shaft of the motor 17 and the floating end extension shaft of the lead screw assembly 1. The bearing seats at both ends of the lead screw assembly 1 are fixed to the inner machined surface of the L-shaped support plate 9. The guide rail of the guide rail assembly 13 is fixed to the stepped surfaces on both sides of the inner machined surface of the L-shaped support plate 9. The mounting plate 12 is installed with screws on the nut mounting surface of the lead screw assembly 1 and the slider mounting surface of the guide rail assembly 13, which are in the same plane. The connecting plate 11 connects and fixes the sliding table to the welding lug 10 and the mounting plate 12. The above parts together form the sliding table structure, which converts the rotational motion of the motor into linear motion and transmits it to the bellows, enabling it to achieve compression and tension motion to drive the oxygen copper hollow target seat 7 and the target plate 18 into and out of the optical path.

[0034] The oxygen-free copper hollow target holder 7 described above has an inner diameter larger than the spot size, and its lower edge is cut at a 45° angle. The cut surface is at a 45° angle to the beam inlet direction. The cylindrical surface on the side of the cut surface has a circular hole to allow the beam inlet to enter. The target plate 18 is a transparent scintillator crystal plate, which is mounted on the cut surface and fixed and pressed by the clamping block 8.

[0035] The observation window 4 described above is paired with the flange on the bellows 6, allowing the target sheet 18 to be seen through the observation window 4. The imaging system 2 is mounted on the imaging system mounting bracket 5 via the camera bracket 3, with the lens facing the observation window 4 and coaxially mounted therewith. The imaging system mounting bracket 5 has elongated slotted screw holes, facilitating adjustment of the object distance between the imaging system 2 and the target sheet 18 to ensure clear acquisition of the fluorescence image.

[0036] The overall working optical path is that the beam is incident on the front of the target 18 at 45°. Part of the beam is absorbed by the target 18 and converted into a fluorescence signal. Since the target 18 is transparent, the imaging system 2 obtains the fluorescence image of the back of the target 18 through the observation window 4, thereby obtaining the beam shape, size and intensity signal.

[0037] The device can also be made into a fluorescent target with a cavity and support, but compared to the structure of this invention, the overall structure is more complex, occupies more space, is more expensive, installation and maintenance are relatively difficult, and it is difficult to integrate with the optical equipment of monochromators and mirror boxes, and it is farther away from the beam monitoring point. The fluorescent target with a cavity and support can be used in beam diagnostic scenarios that require higher resolution.

[0038] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A simple fluorescent target device, characterized in that, Includes target plate, bellows welding assembly, drive and guide components, and imaging system; The target plate is mounted on the target holder of the bellows welding assembly; The drive guide component is used to compress or stretch the bellows of the bellows welding assembly to feed the target into or clear the optical path. The bellows welding assembly includes a bellows, a support plate, an imaging system mounting plate, a sliding stage connecting welding lug, and a target base. The target base is placed inside the bellows and welded to its upper flange. It is hollow inside with an inner diameter larger than the beam spot size, and its lower edge is beveled with holes for beam injection. The support plate is welded to the outer edge of the lower loose flange of the bellows. The drive guide component is mounted on the support plate and connected and fixed to the sliding stage connecting welding lug mounted on the outer edge of the upper flange. The imaging system mounting plate is mounted on the outer edge of the upper flange. The imaging system is used to receive the fluorescence signal emitted when the beam hits the target surface of the target sheet in the optical path.

2. The simplified fluorescent target device according to claim 1, characterized in that, The lower edge of the cut surface is at 45° to the beam injection direction; the target plate is pressed and attached to the cut surface by a clamping block.

3. The simplified fluorescent target device according to claim 1, characterized in that, The target seat passes through the bellows and is welded to the inner wall of the upper welding flange thereon. The target seat is coaxial with the upper welding flange of the bellows. The support plate is welded to the outer edge of the lower loose flange of the bellows, and the welding surface does not exceed the sealing surface. The sliding table connecting welding lug is welded to the outer edge of the upper welding flange of the bellows, keeping parallel to the upper welding flange and on the same side as the support plate.

4. The simplified fluorescent target device according to claim 1, 2, or 3, characterized in that, The drive and guide component includes a motor, a coupling, a lead screw assembly, two guide rails, and a mounting plate. The output shaft of the motor is connected to the input end of the lead screw assembly via the coupling to convert rotary motion into linear motion. The two guide rails are arranged on both sides of the lead screw assembly. The bearing seats at both ends of the lead screw assembly are fixed to the inner machined surface of a support plate. The two guide rails are fixed to the stepped surfaces on both sides of the inner machined surface of the support plate. The mounting plate is mounted on the lead screw nut mounting surface of the lead screw assembly and the slider mounting surface of the guide rails.

5. The simplified fluorescent target device according to claim 4, characterized in that, The coupling is placed inside the coupling protective cover and connects the extended shaft of the motor and the floating end extended shaft of the lead screw assembly; the coupling protective cover is connected to the motor support plate and fixed to the cantilever side of the support plate.

6. The simplified fluorescent target device according to claim 4, characterized in that, The sliding table is connected and fixed to the mounting plate via a connecting plate.

7. The simplified fluorescent target device according to claim 1, 2, or 3, characterized in that, The imaging system mounting plate is provided with elongated slotted screw holes for adjusting the object distance between the imaging system and the target.

8. The simplified fluorescent target device according to claim 1, 2, or 3, characterized in that, The imaging system mounting plate is installed on the upper welded flange of the bellows, with the welding lugs of the slide table opposite to those of the mounting plate.

9. The simplified fluorescent target device according to claim 1, 2, or 3, characterized in that, The imaging system includes a camera and a lens. An observation window is provided between the imaging system and the corrugated pipe welding assembly. The camera is mounted on the imaging system mounting plate via a cantilever structure bracket, so that the lens faces the observation window and is coaxially mounted with it.

10. The simplified fluorescent target device according to claim 1, 2, or 3, characterized in that, The target is made of scintillator crystal material.

Images