CN103985497A - Rectangular magnetic field coil device - Google Patents
Rectangular magnetic field coil device Download PDFInfo
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- CN103985497A CN103985497A CN201410238353.5A CN201410238353A CN103985497A CN 103985497 A CN103985497 A CN 103985497A CN 201410238353 A CN201410238353 A CN 201410238353A CN 103985497 A CN103985497 A CN 103985497A
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Abstract
Disclosed is a rectangular magnetic field coil device. The rectangular magnetic field coil device is used for an atom chip interferometer and is characterized by comprising a rectangular transfer coil pair composed of a pair of rectangular Helmholtz coils, an MOT coil pair composed of a pair of rectangular reverse Helmholtz coils, an x-direction bias coil pair, a y-direction bias coil pair and a z-direction bias coil pair, and the x-direction bias coil pair, the y-direction bias coil pair and the z-direction bias coil pair are composed of rectangular Helmholtz coils. The device is mainly used for providing various space magnetic fields for the atom cooling, trapping and transferring process, and providing an external bias magnetic field needed by an atom chip magnetic well. The device has the advantages that the magnetic field coils are all of a rectangular structure, and the structure is more compact, more stable and smaller. The light-transmitting needs for cooling light, reverse pumping light, pumping light, detecting light, beam splitting light and other laser beams in the atom interferometer study are considered in the device.
Description
Technical field
The present invention relates to square coil, particularly a kind of rectangle field coil device for Atom Chip interferometer, the field coil of this device all adopts rectangular configuration, and structure is more compact, stable and small-sized; This device can be taken into account the logical light requirement to multi-path laser bundles such as cooling light, back suction fortune light, pumping light, detection light, beam splitting light in atomic interferometer research.
Background technology
The external magnetic field coil of using in cold atom research mainly contains two kinds of structures: circular field coil and rectangle field coil.Main employing is circular field coil at present.As Germany
magnetic four utmost point traps that group utilizes the anti-Helmholtz coil of a pair of circle outside vacuum chamber to produce, load atom (referring to document 1M.Greiner, I.Bloch, T.W.
and T Esslinger, Magnetic transport of trapped cold atoms over a large distance, Phys.Rev.A, 2001,63 (3), 031401).The E.A.Cornell group of the U.S. utilizes the reverse Helmholtz coil of a pair of circle, the transfer that has realized magnetic well by mechanical shifting magnetic field coil is (referring to document 2H.Lewandowski, D.Harber, D Whitaker, and E.Cornell, Simplified system for creating a Bose-Einstein condensate, J.Low Temp.Phys., 2003,132,309-367).In its experiment, only relate to preparation, imprison or the transfer of cold atom, coil function singleness used, simple in structure.And the research of current atom chip main flow increasingly, micro-magnetic well of realizing tight-binding on Atom Chip generally all needs the participation of peripheral bias-field, thereby has increased peripheral field coil quantity.After prepared by cold atom; conventionally also need that the cold atom in macroscopical magnetic well is transferred to the micro-magnetic well of Atom Chip or other Experimental Area is handled, in magnetic well transfer method, transfer stitch adds the design difficulty that has also increased circular field system compactedness and stability.
Atom Chip interferometer system relate to atom cooling, imprison, transport, the process such as chip magnetic trap loading and annular magnetic guiding, need all kinds of peripheral magnetic field building to relate to three dimensions totally five pairs of coils.In addition all kinds of magnetic field on chip and geomagnetic shielding field, makes the field coil structure of system comparatively complicated.
Above-mentioned Liang Ge foreign organization all adopts circular coil to produce the scheme in magnetic field.Although circular coil coiling is simple, not unique when the direction in required magnetic field, the quantity of coil is more, and just need to consider structural relation and fixed form between the multipair coil of multiple directions when limited space, and the requirement of compactedness.Now circular coil can bring the problems such as loose huge, the fixing difficulty of complex structure, system, is realizing technical more difficultly, has reduced reliability, compactedness and the feasibility of field system.
Summary of the invention
The object of the invention is to overcome the following deficiency existing in existing multipair circular coil system:
(1) the fixing difficulty of multipair circular coil, is difficult for location.
(2) between multipair circular coil, easily mutually stop, for making it mutually not stop the distance that just inevitably need to change coil, cause the uniformity variation of bias magnetic field, magnetic well gradient to reduce.
(3) multipair circular coil system bulky, loosely organized and easily stop light path.A kind of rectangle field coil device for Atom Chip interferometer is provided, and the Main Function of this device is to provide all kinds of space magnetic fields for cooling, the imprison of atom and transfer process, and provides required external bias magnetic field for Atom Chip magnetic well.The feature of this device is: field coil all adopts rectangular configuration, utilizes the nested integrated design of holding concurrently of part, has realized the combination between various dimensions, multi-coil and has fixed, and makes structure more compact, stable, is convenient to integrated and miniaturization; By can realize the movement of magnetic well dead-center position to the control of coil current, transfer process is accurately controlled and avoided the interference of intrinsic vibrations in mechanical transfer mode; This device has been taken into account the logical light requirement to multi-path laser bundles such as cooling light, back suction fortune light, pumping light, detection light, beam splitting light in atomic interferometer research simultaneously.
Technical solution of the present invention is as follows:
A kind of rectangle field coil device for Atom Chip interferometer, feature is that its formation comprises the rectangle transfer stitch pair of a pair of rectangle Helmholtz coil composition, the MOT coil pair of the anti-Helmholtz coil composition of a pair of rectangle, the x being made up of rectangle Helmholtz coil is to bias coil pair, y is to bias coil pair, z is to bias coil pair, described rectangle transfer stitch is on rectangle transfer stitch skeleton, described MOT coil is on MOT coil rack, described x to bias coil around x on bias coil skeleton, described y to bias coil to around y on bias coil skeleton, z to bias coil to around z on bias coil skeleton, described x turns to x to bias coil skeleton to the skeleton one of rectangular bias coil rack and MOT coil, x is box-like to bias coil skeleton,
Described rectangle transfer stitch and x place in the same way to bias coil, described rectangle transfer stitch skeleton is nested in the inside of x to bias coil skeleton, and the part that x fits to the end face of bias coil skeleton and rectangle transfer stitch skeleton is inwardly emptied 0.1-2mm; The part gap that x fits to bias coil skeleton and rectangle transfer stitch skeleton side, two outer side edges of described rectangle transfer stitch skeleton are respectively equipped with outer side edges boss, on this outer side edges boss, there is screwed hole, the position of screwed hole is consistent to the location notch on bias coil skeleton with x, props up pole pair rectangle transfer stitch position and fix by two screw threads;
Described x to rectangular bias coil pair with MOT coil to being close to, described x is to the integrated x of the skeleton of rectangular bias coil rack and MOT coil to bias coil skeleton, have a coiling hole and two lower baffle plate fixing holes to the front of bias coil skeleton at x, the radius in coiling hole is greater than the radius of coiling, baffle plate is the aid in coiling process, heat sink as coil after having wound the line;
Described y is respectively equipped with two side through hole boss to the side of the vertical edge of the skeleton of bias coil, on this side through hole boss, have through hole, has the location notch of 4 MOT coil racks in the following inner side of this skeleton;
Described z is respectively equipped with two pairs of inner side edge boss to the inner side on two limits of the skeleton of bias coil, the spacing of every pair of inner side edge boss is just in time inserted to bias coil skeleton for described y, on each inner side edge boss, be equipped with two orthogonal screwed holes, by pole, upper and lower two coils are connected and fixed, one end of pole is plus thread, and the other end is left-hand thread; The center superposition of three pairs of described bias coils;
Described MOT coil and x place in the same way and are close to bias coil, the side of its vertical edge is respectively equipped with two side boss, on side boss, there is screwed hole, match to the fixing hole on bias coil skeleton with described y in the position of this screwed hole, MOT coil and x are fixed to rectangular bias coil by the screwed hole on through hole and side boss with screw, this x has a coiling hole on the lateral surface of rectangular bias coil rack.
Coiling hole on all skeletons is half-blind hole, and the skeleton core plane of the center of circle in the hole that winds the line and skeleton inside is coplanar.
Technique effect of the present invention:
1, device provided by the invention utilizes square coil to produce the device of transferable magnetic well and three-dimensional bias magnetic field.This apparatus structure compactness, convenient fixing, is convenient to the integrated of multiple field coils.
2, the integral type of MOT coil and bias coil designs, and rectangle transfer stitch is nested in to the inside of bias coil, makes whole system structure more compact firm.Reduce greatly the volume of field system, improved the parameters index in magnetic field.
3, rectangular bias coil is relevant with the ratio of distances constant of the reverse gradient of Helmholtz coil and the length of side of rectangle and two coils, can calculate best distance value make the magnetic field gradient producing reach optimum by software programming.The bias coil that the z using in the present invention axially places it calculate to such an extent that optimum distance is 128.5mm in the time that the length of side is 258.3mm, and the magnetic field producing under the relation of this length of side and distance is 7.7 × 10 in the magnetic field gradient calculating value at 10mm place, distance center position
-7mT/cm/A, the magnetic field gradient that experiment records is less than 0.005mT/cm/A, has improved greatly the uniformity in magnetic field.The MOT coil of using in the present invention it calculate to such an extent that optimum distance is 185.6mm in the time that the length of side is 103.2mm, and the magnetic field gradient calculating value producing under the relation of this length of side and distance is 0.68mT/cm/A, and the magnetic field gradient that experiment records reaches 0.725mT/cm/A.
4, can realize non-mechanical, that speed is controlled and stable magnetic well by the current ratio of control rectangle transfer stitch and rectangle MOT coil shifts.Rectangle transfer stitch size is less, and space had both been saved in the inside that is placed in bias coil makes compact conformation, can increase again the magnetic well degree of depth, improves transfer efficiency, reduces the caloric value of control circuit and coil, increases the stability of system.
Brief description of the drawings
Fig. 1 is the device schematic diagram of rectangle field coil shell system of the present invention
Fig. 2 is rectangle transfer stitch skeleton structure diagram
Fig. 3 is the one skeleton structure diagram of the axial rectangular bias coil of x and MOT coil
Fig. 4 is the nest relation figure of the one skeleton of rectangle transfer stitch skeleton and MOT coil
Fig. 5 is the axial rectangular bias coil skeleton structure of y figure
Fig. 6 is the axial rectangular bias coil rack of z and pole and understructure figure
Fig. 7 is the location diagram of rectangle field coil of the present invention
Wherein: 1. vacuum glass pond; 2. transfer stitch; 2.1. the logical light mouth in bottom; 2.2. wire outlet; 2.3. wiring inlet; 2.4. transfer stitch skeleton and x axialy offset coil rack fit place breach; 2.5. protect the breach in vacuum glass pond; 2.6. outer side edges boss; 2.7. pole bayonet socket; 2.8. pole; 2.9. pole boss; The one skeleton of the bias coil that 3.x is axial and MOT coil; 3.1. skeleton overhead gage; 3.2. skeleton side shield; 3.3. side boss; 3.4. lower baffle plate fixing hole; 3.5. side shield fixing hole; 3.6. overhead gage fixing hole; 3.7.MOT coil-winding hole; 3.8.MOT coil-winding groove; 3.9. protect the breach on top, vacuum glass pond; 3.10. axialy offset coil-winding hole; 3.11. groove; 3.12. location notch; 3.13. protect the breach in vacuum glass pond; 4.y axialy offset coil; 4.1. side through hole boss; 4.2. axialy offset coil rack draw-in groove; 4.3. logical light mouth; 4.4.MOT coil rack draw-in groove; 4.5. the fixing hole on side through hole boss; 4.6. hole winds the line; 4.7. winding slot; 5.z axialy offset coil; 5.1. the screwed hole of inner side edge boss side surfaces; 5.2. inner side edge boss; 5.3. inner side edge boss front screwed hole; 5.4. hole winds the line; 5.5. winding slot; 5.6. logical light mouth; 6. coil base; The axial coil screw thread of 7.z pole; 7.1. pole bayonet socket; 8. transfer stitch pair; 9.x axialy offset coil pair; 10.MOT coil pair; 11.y axialy offset coil pair; 12.z axialy offset coil pair.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but should not limit excursion of the present invention with this.
Consult Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7.Fig. 1 is the device schematic diagram of rectangle field coil shell system of the present invention, Fig. 2 is rectangle transfer stitch skeleton structure diagram, Fig. 3 is the one skeleton structure diagram of the axial rectangular bias coil of x and MOT coil, Fig. 4 is the nest relation figure of the one skeleton of rectangle transfer stitch skeleton and MOT coil, Fig. 5 is the axial rectangular bias coil skeleton structure of y figure, Fig. 6 is the axial rectangular bias coil rack of z and pole and understructure figure, and Fig. 7 is the location diagram of rectangle field coil of the present invention.As seen from the figure, rectangle field coil device of the present invention, comprise that the rectangle transfer stitch of a pair of rectangle Helmholtz coil composition is to 8, the MOT coil of the anti-Helmholtz coil composition of a pair of rectangle is to 10, the x being formed by rectangle Helmholtz coil to bias coil to 9, y to bias coil to 11, z to bias coil to 12, described rectangle transfer stitch 8 is on rectangle transfer stitch skeleton 2, described MOT coil to 10 on MOT coil rack, described x to bias coil 9 around x on bias coil skeleton 3, described y to bias coil to 11 around y on bias coil skeleton 4, z to bias coil to 12 around z on bias coil skeleton 5, described x turns to x to bias coil skeleton 3 to the skeleton one of rectangular bias coil rack and MOT coil, x is box-like to bias coil skeleton 3,
Described rectangle transfer stitch 8 is placed to bias coil 9 in the same way with x, described rectangle transfer stitch skeleton 2 is nested in the inside of x to bias coil skeleton 3, and x is inwardly emptied 0.1-2mm to bias coil skeleton 3 and the part 3.11 that the end face of rectangle transfer stitch skeleton 2 fits; The part gap 2.4 that x fits to bias coil skeleton 3 and rectangle transfer stitch skeleton 2 sides, two outer side edges of described rectangle transfer stitch skeleton 2 are respectively equipped with outer side edges boss 2.6, on this outer side edges boss, there is screwed hole, the position of screwed hole is consistent to the location notch 3.12 on bias coil skeleton 3 with x, by two screw thread poles 2.8, rectangle transfer stitch 8 is positioned and is fixed;
Described x is close to 10 with MOT coil 9 to rectangular bias coil, described x is to the integrated x of the skeleton of rectangular bias coil rack and MOT coil to bias coil skeleton 3, have a coiling hole 3.10 and two lower baffle plate fixing holes 3.4 to the front of bias coil skeleton 3 at x, the radius in coiling hole is greater than the radius of coiling, baffle plate is the aid in coiling process, heat sink as coil after having wound the line;
Described y is respectively equipped with two side through hole boss 4.1 to the side of the vertical edge of the skeleton 4 of bias coil, on this side through hole boss, have through hole 4.5, has the location notch 4.2,4.4 of 4 MOT coil racks in the following inner side of this skeleton 4;
Described z is respectively equipped with two pairs of inner side edge boss 5.2 to the inner side on two limits of the skeleton 5 of bias coil, the spacing of every pair of inner side edge boss is just in time inserted to bias coil skeleton 4 for described y, on each inner side edge boss, be equipped with two orthogonal screwed holes 5.1,5.3, by pole 7, upper and lower two coils are connected and fixed, one end of pole is plus thread, and the other end is left-hand thread; The center superposition of three pairs of described bias coils;
Described MOT coil 10 is placed in the same way and is close to bias coil 9 with x, the side of its vertical edge is respectively equipped with two side boss 3.3, on this side boss, there is screwed hole, match to the fixing hole 4.5 on bias coil skeleton 4 with described y in the position of this screwed hole, MOT coil and x are fixed to rectangular bias coil 9 by the screwed hole on through hole 4.5 and side boss 3.3 with screw, this x has a coiling hole 3.10 on the lateral surface of rectangular bias coil rack 3.
That embodiment further illustrates below:
Its inside is placed and be nested in to the axial bias coil 9 of described transfer stitch 8 and x in the same way.The minimum length of side of this transfer stitch is 29.2mm, and two coils, at a distance of 47.2mm, are obtained by 15 layers of copper wire winding 15 circles of 1.2mm diameter.The axial bias coil 9 of this coil and x is nested designs, its skeleton 2 is box-like design, the part 3.11 fitting at its skeleton and x axial line ring framework is inwardly emptied 0.5mm, to ensure the firm of transfer stitch, and have a breach 2.4 of the high 30mm of wide 45mm at the another side of skeleton, transfer stitch and x axialy offset coil are fitted tightly, improve the compactedness of system.Skeleton bottom has the logical light mouth 2.1 of wide 15mm.The dual-side of skeleton is respectively equipped with outer side edges boss 2.6, on outer side edges boss, has screwed hole, and the location notch 3.12 on the bias coil skeleton that axially place with x the position of screwed hole is consistent, positions and fixing transfer stitch by two screw thread poles 2.8.On the lateral surface of this skeleton, have inlet wire groove 2.3 and the line outlet groove 2.2 of a coiling.
The bias coil 12 that the bias coil 11 that the bias coil 9 that described bias coil is axially placed by a pair of x and a pair of y axially place and a pair of z axially place forms.The minimum length of side of bias coil 9 that this x axially places is 103.2mm, and two coils, at a distance of 47.2mm, are obtained by 15 layers of copper wire winding 15 circles of 1.2mm diameter.Itself and MOT coil 10 are close to, and its skeleton 3 is the integrated design with the skeleton 3 of MOT coil 10.Have 15mm opening 3.9 in the top of skeleton 3, the opening 3.13 that has below 45mm at it, these openings are used for as vacuum glass pond 1 headspace, and guarantee skeleton can not encountered vacuum glass pond.Have the location notch 3.12 of two dark 1mm of wide 3mm in the following inner side of its skeleton, the inner side of skeleton top has the holddown groove 3.11 of the dark 1mm of the wide 20mm of long 75mm.And its front has a coiling hole 3.10 and two baffle plate fixing holes 3.4.The effect of baffle plate is aid in the process of coiling, does not also need to be pulled down heat sink as coil after coiling completes.The bias coil 11 that this y axially places is vertical with the bias coil 9 that x axially places, and the minimum length of side is 204.3mm, and two coils, at a distance of 98mm, are obtained by 20 layers of copper wire winding 10 circles of 1.3mm diameter.The outside of skeleton 4 vertical edges of this coil is respectively equipped with two side through hole boss 4.1, on side through hole boss, has through hole 4.5, in order to fixing MOT coil.And the inner side, base at its skeleton has 5 breach, and wherein 4 is the location notch 4.2,4.4 of MOT coil 10, another breach 4.3 is to ensure that laser beam is not subject to blocking of skeleton.The minimum length of side of bias coil 12 that this z axially places is 258.3mm, and two coils, at a distance of 128.5mm, are obtained by 20 layers of copper wire winding 20 circles of 1.3mm diameter.The wherein inner side on two limits of the skeleton 5 of this coil is respectively equipped with two pairs of inner side edge boss 5.2, and the coil rack 4 that the spacing of every pair of inner side edge boss just in time can axially be placed y inserts.On each inner side edge boss, be equipped with two orthogonal screwed holes 5.1,5.3, wherein the screwed hole 5.1 of level fixes by screw the coil rack 4 that y axially places.Perpendicular screwed hole 5.3 on bottom coil skeleton inner side edge boss is in order to firm banking 6, to fix whole loop construction.Screwed hole on skeleton inner side edge boss is by pole 7 by coil support axial upper and lower two z and fixing, and wherein one end of pole is plus thread, and the other end is left-hand thread.Three pairs of described bias coil center superpositions.
The axial bias coil 9 of described MOT coil 10 and x is placed in the same way and is close to.The minimum length of side of this MOT coil 10 is 103.2mm, and two coils, at a distance of 85.6mm, are obtained by 20 layers of copper wire winding 20 circles of 1.3mm diameter.This coil rack 3 is the integrated design with the bias coil skeleton 3 that x axially places, the side of its vertical edge is respectively equipped with two side boss 3.3, on side boss, there is screwed hole, through hole on the bias coil skeleton 4 that axially place with y the position of screwed hole is consistent, in order to fixing MOT coil 10 and axial bias coil 9 and the transfer stitch 8 of x.On the lateral surface of skeleton 3, have a coiling hole 3.10,3.8, six baffle plate fixing holes of winding slot 3.5,3.6.
The wire skeleton of better fitting when making to wind the line, the design in the coiling hole 3.7,3.10,4.6,5.4 of all coils skeleton all adopts the design of half-blind hole, and the skeleton core plane of the center of circle in the hole that winds the line and skeleton inside is coplanar.
The present invention proposes a set of nested type, integrated rectangle field coil device, make overall structure more compact, stable.Field coil all adopts rectangular configuration, utilizes part nested designs, has realized the fixing and combination between various dimensions, multi-coil, makes total more compact, stable, is convenient to integrated and miniaturization.Helmholtz coil is to the bias magnetic field good uniformity producing, and oppositely Helmholtz coil is large to the magnetic well well depth producing, and constraint ability is strong.By can realize the movement of magnetic well dead-center position to the control of coil current, transfer process is accurately controlled and avoided the intrinsic vibrations that exist in Mechanical Moving mode.Take into account the logical light requirement to multi-path laser bundles such as cooling light, back suction fortune light, pumping light, detection light, beam splitting light in the research of cold atom interferometer.
Claims (2)
1. the rectangle field coil device for Atom Chip interferometer, be characterised in that rectangle transfer stitch that its formation comprises a pair of rectangle Helmholtz coil composition is to (8), the MOT coil of the anti-Helmholtz coil composition of a pair of rectangle is to (10), the x being formed by rectangle Helmholtz coil to bias coil to (9), y to bias coil to (11), z to bias coil to (12), described rectangle transfer stitch (8) is on rectangle transfer stitch skeleton (2), described MOT coil to (10) on MOT coil rack, described x to bias coil (9) around x on bias coil skeleton (3), described y to bias coil to (11) around y on bias coil skeleton (4), z to bias coil to (12) around z on bias coil skeleton (5), described x turns to x to bias coil skeleton (3) to the skeleton one of rectangular bias coil rack and MOT coil, x is box-like to bias coil skeleton (3),
Described rectangle transfer stitch (8) is placed to bias coil (9) in the same way with x, described rectangle transfer stitch skeleton (2) is nested in the inside of x to bias coil skeleton (3), and x is inwardly emptied 0.1-2mm to bias coil skeleton (3) and the part (3.11) that the end face of rectangle transfer stitch skeleton (2) fits; The part gap (2.4) that x fits to bias coil skeleton (3) and rectangle transfer stitch skeleton (2) side, two outer side edges of described rectangle transfer stitch skeleton (2) are respectively equipped with outer side edges boss (2.6), on this outer side edges boss, there is screwed hole, the position of screwed hole is consistent to the location notch (3.12) on bias coil skeleton (3) with x, by two screw thread poles (2.8), rectangle transfer stitch (8) is positioned and is fixed;
Described x is close to (10) (9) and MOT coil to rectangular bias coil, described x is to the integrated x of the skeleton of rectangular bias coil rack and MOT coil to bias coil skeleton (3), have coiling hole (3.10) and two lower baffle plate fixing holes (3.4) to the front of bias coil skeleton (3) at x, the radius in coiling hole is greater than the radius of coiling, baffle plate is the aid in coiling process, heat sink as coil after having wound the line;
Described y is respectively equipped with two side through hole boss (4.1) to the side of the vertical edge of the skeleton (4) of bias coil, on this side through hole boss, have through hole (4.5), have location notch (4.2), (4.4) of 4 MOT coil racks in the following inner side of this skeleton (4);
Described z is respectively equipped with two pairs of inner side edge boss (5.2) to the inner side on two limits of the skeleton (5) of bias coil, the spacing of every pair of inner side edge boss just in time supplies described y to insert to bias coil skeleton (4), on each inner side edge boss, be equipped with two orthogonal screwed holes (5.1), (5.3), by pole (7), upper and lower two coils are connected and fixed, one end of pole is plus thread, and the other end is left-hand thread; The center superposition of three pairs of described bias coils;
Described MOT coil (10) is placed in the same way and is close to bias coil (9) with x, the side of its vertical edge is respectively equipped with two side boss (3.3), on side boss, there is screwed hole, match to the fixing hole (4.5) on bias coil skeleton (4) with described y in the position of this screwed hole, MOT coil and x are fixed to rectangular bias coil (9) by the screwed hole on through hole (4.5) and side boss (3.3) with screw, this x has a coiling hole (3.10) on the lateral surface of rectangular bias coil rack (3).
2. rectangle field coil device according to claim 1, is characterized in that the coiling hole on all skeletons is half-blind hole, and the skeleton core plane of the center of circle in the hole that winds the line and skeleton inside is coplanar.
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| CN106409375A (en) * | 2016-10-26 | 2017-02-15 | 中国科学院上海光学精密机械研究所 | Atomic beam current device |
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