CN109211950A - A kind of monochrome neutron focusing device - Google Patents
A kind of monochrome neutron focusing device Download PDFInfo
- Publication number
- CN109211950A CN109211950A CN201811272458.7A CN201811272458A CN109211950A CN 109211950 A CN109211950 A CN 109211950A CN 201811272458 A CN201811272458 A CN 201811272458A CN 109211950 A CN109211950 A CN 109211950A
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- China
- Prior art keywords
- neutron
- vertical
- fixing board
- adjustment sheet
- wafer fixing
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Links
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 abstract description 6
- 239000013078 crystal Substances 0.000 abstract description 5
- 229910052732 germanium Inorganic materials 0.000 abstract description 3
- 230000009711 regulatory function Effects 0.000 abstract description 2
- 235000012431 wafers Nutrition 0.000 description 31
- 239000000523 sample Substances 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000001683 neutron diffraction Methods 0.000 description 1
- 238000002250 neutron powder diffraction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/05—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using neutrons
Abstract
The invention discloses a kind of monochromatic neutron focusing devices.The device is a kind of monochromatic neutron normal focused set for Neutron diffractometer, including frame, vertical adjusting driving assembly and horizontal pivot angle adjust component；Vertical adjusting driving assembly use independent design, can separately adjustable single wafer vertical angle；The cuboid that wafer fixing board in horizontal pivot angle adjusting component is splitted using the other end closed at one end is, it can be achieved that the horizontal pivot angle of wafer fixing board is adjusted.The device is in monochromatic neutron focus adjustment, single wafer is provided with vertical focusing and horizontal hunting regulatory function, and beam spot is uniform, and neutron intensity can reach optimum value, it effectively reduces the beam spot as caused by reflection crystal face and clip surface angular difference to dissipate, while reducing personnel by irradiation dose.The device cooperates germanium mosaic crystal and Neutron diffractometer to use, and can carry out monochromatization to large-sized white light neutron beam, focus on sample position, form the monochromatic neutron beam of convergence, improve neutron intensity and utilization rate.
Description
Technical field
The invention belongs to neutron beam monochromatizations and focusing technology field, and in particular to a kind of monochrome neutron focusing device.
Background technique
The neutron that reactor generates is the continuous white light neutron of wavelength, and white light neutron is reflected by germanium mosaic crystal, according to
Bragg's equation can deflect out the monoenergetic neutrons of specific wavelength in the white light neutron of reactor, meet the need of neutron diffraction
It wants.Neutron intensity is the key technical index for directly affecting Spectrometer performance at sample, by using focusing device in monochrome
The convergence of beamlet acts on, and can effectively improve neutron intensity at sample.The main function of focusing device is changed per a piece of monocrystalline
Vertical dip angle and horizontal direction enable monocrystal to reflect the neutron of desired energy, and focus at sample.This technology is wide
It is general to apply on the spectrometer apparatus such as neutron powder diffraction, stress, monocrystalline and three axis.
But current monochromatic neutron focuses technically there is also many disadvantages, the focus adjustment functions of chip are adopted
The vertical angle of single motor control all wafers is used by presetting the rotation ratio of each axis with mechanical linkage mode
Degree.Due to chip reflecting surface and uneven surface row, the angle on each chip and surface is not consistent, will cause each chip reflection
Neutron beam cannot be completely coincident at sample, neutron intensity not only be reduced, and since neutron beam spot area increases, to spectrometer
Signal-to-noise ratio also has a significant impact, and in addition this mode needs manual hand manipulation more, there is commissioning staff compared with large radiation.
Currently, it needs to design a kind of automatic monochromatization normal focused set that can be precisely controlled.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of monochromatic neutron focusing devices.
Monochromatic neutron focusing device of the invention, its main feature is that: the focusing device includes frame, vertical adjusting driving
Component and horizontal pivot angle adjust component；
The frame is frame type, two side plates and level including horizontal positioned bottom plate, symmetrically and vertically placed
The upper cover plate of placement, bottom plate, side plate are fixedly connected with upper cover plate；
The vertical adjusting driving assembly includes using Center Wafer fixed plate as the plane of symmetry, and the 2m group of arrangement symmetrical above and below is vertical
Driving group is adjusted, m >=1, every group includes stepper motor, shaft coupling, vertical adjusting spring, adjustment sheet and limiter；The tune
Nodal plate is L-type, and the horizontal ends of adjustment sheet lean on proximal panel, and horizontal ends are connected with cylindrical trunnion axis, and trunnion axis passes through on side plate
Circular hole after fixed with wafer fixing board, adjustment sheet can be rotated around trunnion axis, and the vertical end of adjustment sheet is close to shaft coupling, vertical end
It is fixed on side plate using vertical adjusting spring, stepper motor is tight by the vertical adjusting spring fixed end of shaft coupling and adjustment sheet
Contiguity touching, stepper motor drive trunnion axis of the adjustment sheet on side plate axially to rotate, adjust the vertical angle of wafer fixing board；
It includes 2m group Level tune driving group that the horizontal pivot angle, which adjusts component, and m >=1, every group includes wafer fixing board, level
Adjustment spring and adjusting screw；The wafer fixing board is the cuboid that the other end closed at one end is splitted, and closed end is placed on
It on side plate in corresponding circular hole, splits end and is fixedly connected with trunnion axis, be also equipped with horizontal tune on end close to splitting for trunnion axis
Spring is saved, is tightened by adjusting screw or relaxation level adjustment spring increases or reduces the aperture slots for splitting end.
2m group wafer fixing board is symmetrical above and below and arranges in paraboloid, and the preset rotation angle of each wafer fixing board is
1°。
Monochromatic neutron focusing device of the invention has the following characteristics that
1. vertical adjusting driving assembly use independent design, can separately adjustable single wafer vertical angle, avoid due to chip
The neutron beam of each chip reflection is at sample caused by the angle on reflecting surface and uneven surface row, each chip and surface is inconsistent
It cannot be completely coincident, reach reduction neutron beam spot area, improve the effect of neutron intensity and signal-to-noise ratio；
2. the cuboid that the wafer fixing board in horizontal pivot angle adjusting component is splitted using the other end closed at one end is, it can be achieved that chip
Horizontal pivot angle is adjusted, so that each chip reflecting surface is in same plane in the horizontal direction, reduces neutron beam spot area and water
Flat divergence；
3. wafer fixing board is symmetrical above and below and arranges in paraboloid, each wafer fixing board has preset rotation angle, so that brilliant
Piece arrangement is even closer, increases chip reflective surface area, improves neutron utilization efficiency.
Monochromatic neutron focusing device of the invention is a kind of monochromatization of neutron vertical focusing dress for Neutron diffractometer
It sets, in monochromatic neutron focus adjustment, single wafer is provided with vertical focusing and horizontal hunting regulatory function, and beam spot is uniform, in
Sub- intensity can reach optimum value, avoids the shortcomings that standard machinery coordinated type monochromator is difficult to control minimum beam spot, can effectively subtract
Few beam spot as caused by practical reflection crystal face and clip surface angular difference dissipates, while reducing personnel by irradiation dose.The present invention
Monochromatic neutron focusing device cooperation germanium mosaic crystal and Neutron diffractometer use, can to large-sized white light neutron beam into
Row monochromatization, focuses on sample position, forms the monochromatic neutron beam of convergence, helps to improve neutron intensity and utilization rate.
Detailed description of the invention
Fig. 1 is monochromatic neutron focusing device schematic diagram of the invention；
In figure, 11. bottom plate, 12. upper cover plate, 13. side plate, 21. stepper motor, 22. shaft coupling, 23. vertical adjusting spring 24.
33. adjusting screw of adjustment sheet 25. limiter, 26. trunnion axis, 31. wafer fixing board, 32. Level tune spring, 34. center
Wafer fixing board.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
Following embodiment is merely to illustrate the present invention, and not limitation of the present invention.Related person skilled in the art exists
It in the case where not departing from the spirit and scope of the present invention, can also make a variety of changes, replacement and variant, therefore same technology
Scheme also belongs to scope of the invention.
As shown in Figure 1, monochromatic neutron focusing device of the invention includes frame, vertical adjusting driving assembly and horizontal pivot angle
Adjust component；
The frame is frame type, two 13 and of side plate including horizontal positioned bottom plate 11, symmetrically and vertically placed
Horizontal positioned upper cover plate 12, bottom plate 11, side plate 13 are fixedly connected with upper cover plate 12；
The vertical adjusting driving assembly includes with Center Wafer fixed plate 34 for the plane of symmetry, and the 2m group of arrangement symmetrical above and below is hung down
Straight to adjust driving group, m >=1, every group includes stepper motor 21, shaft coupling 22, vertical adjusting spring 23, adjustment sheet 24 and limiter
25；The adjustment sheet 24 is L-type, and the horizontal ends of adjustment sheet 24 lean on proximal panel 13, and horizontal ends are connected with cylindrical trunnion axis
26, trunnion axis 26 is fixed after passing through the circular hole on side plate 13 with wafer fixing board 31, and adjustment sheet 24 can be rotated around trunnion axis 26, be adjusted
The vertical end of nodal plate 24 is fixed on side plate 13 close to shaft coupling 22, vertical end using vertical adjusting spring 23, stepper motor 21
It is in close contact by 23 fixing end of vertical adjusting spring of shaft coupling 22 and adjustment sheet 24, stepper motor 21 drives 24 edge of adjustment sheet
The axial rotation of trunnion axis 26 on side plate 13, adjusts the vertical angle of wafer fixing board 31；
It includes 2m group Level tune driving group that the horizontal pivot angle, which adjusts component, and m >=1, every group includes wafer fixing board 31, water
Flat adjustment spring 32 and adjusting screw 33；The wafer fixing board 31 is the cuboid that the other end closed at one end is splitted, closing
End is placed on side plate 13 in corresponding circular hole, is splitted end and is fixedly connected with trunnion axis 26, close to splitting on end for trunnion axis 26
It is also equipped with Level tune spring 32, is tightened by adjusting screw 33 or relaxation level adjustment spring 32 is splitted to increase or reduce
The aperture slots at end.2m group wafer fixing board 31 is symmetrical above and below and arranges in paraboloid, the preset rotation of each wafer fixing board 31
Gyration is 1 °.
Embodiment 1
M=6 of the present embodiment.
The course of work of the present embodiment is as follows:
It drives shaft coupling 22 to advance by stepper motor 21 first and pushes one end of adjustment sheet 24, adjustment sheet 24 rotates corresponding angle
Degree, wafer fixing board 31 are rotated with adjustment sheet 24, are adjusted wafer inclination angle, are obtained the corresponding explorer count in inclination angle, neutron
Inclination angle is optimum value when counting maximum.Then rotation adjusting screw 33 pushes 31 upper layer of wafer fixing board, upper chip fixed plate
31 form corresponding level inclination, adjust wafer-level pivot angle, and the corresponding horizontal pivot angle of detector maximum count is optimum value.
The stepper motor (21) of the present embodiment totally 12, is separately mounted on two side plates, and shaft coupling (22) is mounted on step
Into on the rotary output axis of motor (21), the installation through-hole and adjustment sheet (24) vertical end passed through on side plate (13) is in close contact,
It adjustment sheet (24) totally 12, is separately mounted on two side plates, adjustment sheet (24) horizontal ends pass through side plate by trunnion axis (26)
(13) installation through-hole on is connect with wafer fixing board (31), and vertical end is fixed by vertical adjusting spring (23) and side plate (13)
Connection, is separately mounted on two side plates (13), can limit the vertical adjusting angle of adjustment sheet (24) by limiter (25) totally 12
Range is ± 1 °.
The wafer fixing board (31) of the present embodiment totally 12 is arranged with Center Wafer fixed plate (34) vertical symmetry,
Spacing 0.5mm, the preset 1 ° of angle of vertical direction between fixed plate are in paraboloid, wafer fixing board (31) length 100mm, width
13mm, thickness 6mm, is splitted from one end, fixed using Level tune spring (32), and installation and adjustment screw (33).
The specific embodiment of the present embodiment is that single germanium wafer is bonded in wafer fixing board (31) using radiation resistance glue
On, then entire focusing adjustment is mounted on five maintenance and operation dynamic components, focusing adjustment is tentatively rotated to preliminary
Take-off angle.Incident neutron beam spot diameter, 10mm generates monochromatic neutron after single germanium wafer.Detector is3He counting tube, ruler
Very little is Φ 20mm × 200mm, limits beam, opening size 5mm(W using slit) × 20mm(H), effective probe portion quartile of detector
In sample central area, sample center, chip and incident neutron Shu Gaodu are consistent.By adjust the vertical of each single germanium wafer with
Level angle makes incident neutron converge to sample position.
The focusing neutron beam spot size that the present embodiment obtains is 3cm × 3cm.
Device assembly can be completed in m >=1 in monochromatic neutron focusing device of the invention, but focusing accuracy is lower,
In practical application, it is appropriate increase m be more conducive to using.
Claims (2)
1. a kind of monochrome neutron focusing device, it is characterised in that: the focusing device includes frame, vertical adjusting driving assembly
Component is adjusted with horizontal pivot angle；
The frame is frame type, two side plates including horizontal positioned bottom plate (11), symmetrically and vertically placed
(13) and horizontal positioned upper cover plate (12), bottom plate (11), side plate (13) are fixedly connected with upper cover plate (12)；
The vertical adjusting driving assembly includes with Center Wafer fixed plate (34) for the plane of symmetry, the 2m group of arrangement symmetrical above and below
Vertical adjusting driving group, m >=1, every group includes stepper motor (21), shaft coupling (22), vertical adjusting spring (23), adjustment sheet
(24) and limiter (25)；The adjustment sheet (24) is L-type, and the horizontal ends of adjustment sheet (24) lean on proximal panel (13), horizontal ends
It is connected with cylindrical trunnion axis (26), trunnion axis (26) is solid with wafer fixing board (31) after the circular hole on side plate (13)
Fixed, adjustment sheet (24) can be rotated around trunnion axis (26), and close to shaft coupling (22), vertical end uses vertical the vertical end of adjustment sheet (24)
Straight adjustment spring (23) is fixed on side plate (13), and stepper motor (21) passes through the vertical tune of shaft coupling (22) and adjustment sheet (24)
It saves spring (23) fixing end to be in close contact, stepper motor (21) drives trunnion axis (26) axis of adjustment sheet (24) on side plate (13)
To rotation, the vertical angle of wafer fixing board (31) is adjusted；
It includes 2m group Level tune driving group that the horizontal pivot angle, which adjusts component, m >=1, every group include wafer fixing board (31),
Level tune spring (32) and adjusting screw (33)；The wafer fixing board (31) is splitted rectangular for the other end closed at one end
Body, closed end are placed on side plate (13) in corresponding circular hole, are splitted end and are fixedly connected with trunnion axis (26), close to trunnion axis
(26) split is also equipped with Level tune spring (32) on end, is tightened by adjusting screw (33) or relaxation level adjustment spring
(32) aperture slots for splitting end are increased or reduced.
2. monochrome neutron focusing device according to claim 1, it is characterised in that: 2m group wafer fixing board (31) is right up and down
Claim and be in paraboloid arrangement, the preset rotation angle of each wafer fixing board (31) is 1 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811272458.7A CN109211950B (en) | 2018-10-30 | 2018-10-30 | Monochromatic neutron focusing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811272458.7A CN109211950B (en) | 2018-10-30 | 2018-10-30 | Monochromatic neutron focusing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109211950A true CN109211950A (en) | 2019-01-15 |
| CN109211950B CN109211950B (en) | 2024-02-13 |
Family
ID=64997607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811272458.7A Active CN109211950B (en) | 2018-10-30 | 2018-10-30 | Monochromatic neutron focusing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109211950B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111812133A (en) * | 2020-07-16 | 2020-10-23 | 北京大学 | Monochromator capable of adjusting focusing radius |
| CN112002455A (en) * | 2020-08-25 | 2020-11-27 | 北京大学 | Monochromator for manually adjusting focusing radius |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221516A (en) * | 2011-03-17 | 2011-10-19 | 中国科学院化学研究所 | Adjusting device for monochromator of neutron reflecting spectrometer and method for adjusting monochromator by using same |
-
2018
- 2018-10-30 CN CN201811272458.7A patent/CN109211950B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221516A (en) * | 2011-03-17 | 2011-10-19 | 中国科学院化学研究所 | Adjusting device for monochromator of neutron reflecting spectrometer and method for adjusting monochromator by using same |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111812133A (en) * | 2020-07-16 | 2020-10-23 | 北京大学 | Monochromator capable of adjusting focusing radius |
| CN111812133B (en) * | 2020-07-16 | 2023-02-28 | 北京大学 | Monochromator capable of adjusting focusing radius |
| CN112002455A (en) * | 2020-08-25 | 2020-11-27 | 北京大学 | Monochromator for manually adjusting focusing radius |
| CN112002455B (en) * | 2020-08-25 | 2022-09-02 | 北京大学 | Monochromator for manually adjusting focusing radius |
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| Publication number | Publication date |
|---|---|
| CN109211950B (en) | 2024-02-13 |
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