CN103985497B - Rectangle field coil device - Google Patents
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- CN103985497B CN103985497B CN201410238353.5A CN201410238353A CN103985497B CN 103985497 B CN103985497 B CN 103985497B CN 201410238353 A CN201410238353 A CN 201410238353A CN 103985497 B CN103985497 B CN 103985497B
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Abstract
A kind of rectangle field coil device for Atom Chip interferometer, it is characterised by that it constitutes the rectangle transfer stitch pair including a pair rectangle Helmholtz coil composition, the MOT coil pair of a pair anti-Helmholtz coil composition of rectangle, the x being made up of rectangle Helmholtz coil to bias coil to, y to bias coil to, z to bias coil pair, the Main Function of this device is to provide all kinds of space magnetic fields for the cooling of atom, imprison and transfer process, and provides required external bias magnetic field for Atom Chip magnetic well. The feature of apparatus of the present invention is: field coil all adopts rectangular configuration, and structure is more compact, stable and small-sized; This device has been taken into account in atomic interferometer research the logical light requirement cooling down light, back suction fortune light, pumping light, the detection multi-path laser bundle such as light, beam splitting light.
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 in atomic interferometer research the logical light requirement cooling down light, back suction fortune light, pumping light, the detection multi-path laser bundle such as light, beam splitting light.
Background technology
The external magnetic field coil used in cold atom research mainly has two kinds of structures: circular magnetic field coil and rectangle field coil. What currently mainly adopt is circular magnetic field coil. Such as GermanyGroup utilizes the quadrupole trap of magnetic of a pair outside vacuum chamber circular anti-Helmholtz coil generation, loads atom (referring to document 1M.Greiner, I.Bloch, T.W.AndTEsslinger, Magnetictransportoftrappedcoldatomsoveralargedistance, Phys.Rev.A, 2001,63 (3), 031401). The E.A.Cornell group of the U.S. utilizes the reverse Helmholtz coil of a pair circle, the transfer of magnetic well is achieved (referring to document 2H.Lewandowski by the shifting magnetic field coil of machinery, D.Harber, DWhitaker, andE.Cornell, SimplifiedsystemforcreatingaBose-Einsteincondensate, J.LowTemp.Phys., 2003,132,309-367). Its experiment only relates to the preparation of cold atom, imprison or transfer, used coil function singleness, simple in construction. And the research of current atom chip main flow increasingly, the micro-magnetic well realizing tight-binding on Atom Chip is typically necessary the participation of peripheral bias-field, thus adding the field coil quantity of periphery. After prepared by cold atom; generally also needing to the cold atom in macroscopic view magnetic well is transferred to the micro-magnetic well of Atom Chip or other Experimental Area is handled, in magnetic well transfer method, the addition of transfer stitch also increases the design difficulty of circular magnetic 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, it is necessary to all kinds of peripheral magnetic field of structure relates to three dimensions totally five pairs of coils.In addition all kinds of magnetic fields on chip and geomagnetic shielding field so that the field coil structure of system is complex.
Above-mentioned two foreign organization all adopts circular coil to produce the scheme in magnetic field. Although circular coil coiling is simple, but when the direction in required magnetic field is not unique, the quantity of coil is more, and is accomplished by the structural relation and the fixed form that consider between the multipair coil of multiple directions and the requirement of compactedness during limited space. Now circular coil can bring the problems such as complicated, loose huge, the fixing difficulty of system of structure, technically more difficult in realization, reduces the reliability of field system, compactedness and feasibility.
Summary of the invention
It is an object of the invention to overcome the following deficiency existed in existing multipair circular coil system:
(1) the fixing difficulty of multipair circular coil, not easily positions.
(2) easily mutually stop between multipair circular coil, for making it mutually not stop the distance just inevitably needing to change coil, cause the uniformity of bias magnetic field to be deteriorated, the reduction of magnetic well gradient.
(3) multipair circular coil system bulky, loosely organized and easily stop light path. Thering is provided a kind of rectangle field coil device for Atom Chip interferometer, the Main Function of this device is to provide all kinds of space magnetic fields for the cooling of atom, imprison 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 design of the nested integration of holding concurrently of part, it is achieved that the combination between various dimensions, multi-coil is with fixing so that structure is more compact, stable, it is simple to integrated and miniaturization; By the control of coil current being realized the movement of magnetic well dead-center position, transfer process controllable precise and avoid the interference of intrinsic vibrations in mechanical transfer mode; This device has been taken into account in atomic interferometer research the logical light requirement cooling down light, back suction fortune light, pumping light, the detection multi-path laser bundle such as light, beam splitting light simultaneously.
The technical solution of the present invention is as follows:
A kind of rectangle field coil device for Atom Chip interferometer, it is characterized in that it constitutes the rectangle transfer stitch pair including a pair rectangle Helmholtz coil composition, the MOT coil pair of a pair anti-Helmholtz coil composition 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 wound on rectangle transfer stitch skeleton, described MOT coil is to being wound on MOT coil rack, described x is wound on x on bias coil skeleton to bias coil, described y to bias coil to being wound on y on bias coil skeleton, z to bias coil to being wound on z on bias coil skeleton, described x integrally turns to x to bias coil skeleton to the skeleton of rectangular bias coil rack Yu MOT coil, x is box-like to bias coil skeleton,
Described rectangle transfer stitch and x place in the same direction to bias coil, described rectangle transfer stitch skeleton is nested in the x inside to bias coil skeleton, and the part that x fits to the end face of bias coil skeleton Yu 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, this outer side edges boss there is screwed hole, the position of screwed hole is consistent to the locating slot on bias coil skeleton with x, props up pole pair rectangle transfer stitch by two screw threads and positions and fix;
Described x to rectangular bias coil pair and MOT coil to being close to, described x is to the integrated x of the skeleton of rectangular bias coil rack Yu MOT coil to bias coil skeleton, a winding bore and two lower baffle plate fixing holes are had to the front of bias coil skeleton at x, the radius of winding bore is more than the radius of coiling, baffle plate is the aid in winding process, coiling complete after heat sink as coil;
Described y is respectively equipped with two side through hole boss to the side of the vertical edge of the skeleton of bias coil, and this side through hole boss has through hole, has the locating slot of 4 MOT coil racks in the inner side below 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 inserted to bias coil skeleton for described y, each inner side edge boss is equipped with two orthogonal screwed holes, by pole, upper and lower two coils are connected fixing, 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 direction to bias coil and are close to, the side of its vertical edge is respectively equipped with two side boss, 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, being fixed to rectangular bias coil with x by MOT coil by the screwed hole on through hole and side boss with screw, this x has a winding bore on the lateral surface of rectangular bias coil rack.
Winding bore on all skeletons is half-blind hole, i.e. the skeleton core co-planar of the center of circle of winding bore and skeletal internal.
The technique effect of the present invention:
1, device provided by the invention utilizes square coil to produce transferable magnetic well and the device of three-dimensional bias magnetic field. This apparatus structure is compact, convenient fixing, it is simple to multiple field coils integrated.
2, the unitary design of MOT coil and bias coil, and rectangle transfer stitch is nested in the inside of bias coil so that whole system structure is more compact firm. It is greatly reduced the volume of field system, improves the parameters index in magnetic field.
3, rectangular bias coil is with reversely the gradient of Helmholtz coil is relevant with the ratio of distances constant of the length of side of rectangle and two coils, and the distance value that can be calculated the best by software programming makes the magnetic field gradient produced reach optimum. The z-axis used in the present invention to the bias coil placed its calculate when the length of side is 258.3mm optimum distance is 128.5mm, under the relation of this length of side and distance, the produced magnetic field magnetic field gradient calculating value at 10mm place, distance center position is 7.7 �� 10-7MT/cm/A, the magnetic field gradient that experiment records, less than 0.005mT/cm/A, greatly improves magnetic field's regularity. The MOT coil used in the present invention its calculate when the length of side is 103.2mm optimum distance is 185.6mm, under the relation of this length of side and distance, produced magnetic field gradient calculating value is 0.68mT/cm/A, and the magnetic field gradient that experiment records reaches 0.725mT/cm/A.
4, magnetic well non-mechanical, that speed is controlled and stable transfer can be realized by the current ratio of control rectangle transfer stitch Yu rectangle MOT coil. Rectangle transfer stitch is smaller, is placed in the inside of bias coil and had both saved space and make compact conformation, can increase again the magnetic well degree of depth, improve transfer efficiency, reduce the caloric value of control circuit and coil, increase the stability of system.
Accompanying drawing explanation
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 x-axis one skeleton structure diagram to rectangular bias coil Yu MOT coil
Fig. 4 is the nest relation figure of rectangle transfer stitch skeleton and the one skeleton of MOT coil
Fig. 5 is y-axis to rectangular bias coil skeleton structure figure
Fig. 6 is z-axis to rectangular bias coil rack and pole thereof 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. bottom light admission port; 2.2. wire outlet; 2.3. wiring inlet; 2.4. transfer stitch skeleton and x-axis fit to bias coil skeleton the breach at place; 2.5. the breach in vacuum glass pond is protected; 2.6. outer side edges boss; 2.7. pole bayonet socket; 2.8. pole; 2.9. pole boss; Bias coil that 3.x is axial and the one skeleton of 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. the breach on top, vacuum glass pond is protected; 3.10. axialy offset coil-winding hole; 3.11. groove; 3.12. locating slot; 3.13. the breach in vacuum glass pond is protected; 4.y axialy offset coil; 4.1. side through hole boss; 4.2. axialy offset coil rack draw-in groove; 4.3. light admission port; 4.4.MOT coil rack draw-in groove; 4.5. the fixing hole on side through hole boss; 4.6. winding bore; 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. winding bore; 5.5. winding slot; 5.6. light admission port; 6. coil base; The axial coil screw thread pole of 7.z; 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.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but not herein shall so limit the excursion of the present invention.
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 x-axis one skeleton structure diagram to rectangular bias coil Yu MOT coil, Fig. 4 is the nest relation figure of rectangle transfer stitch skeleton and the one skeleton of MOT coil, Fig. 5 is y-axis to rectangular bias coil skeleton structure figure, Fig. 6 is z-axis to rectangular bias coil rack and pole thereof and understructure figure, 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, including the rectangle transfer stitch of a pair rectangle Helmholtz coil composition to 8, the MOT coil of a pair anti-Helmholtz coil composition of rectangle is to 10, the x being made up of 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 wound on rectangle transfer stitch skeleton 2, described MOT coil is wound on 10 on MOT coil rack, described x is wound on x on bias coil skeleton 3 to bias coil 9, described y is wound on y on bias coil skeleton 4 to bias coil to 11, z is wound on z on bias coil skeleton 5 to bias coil to 12, described x integrally turns to x to bias coil skeleton 3 to the skeleton of rectangular bias coil rack Yu 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 direction with x, described rectangle transfer stitch skeleton 2 is nested in the x inside to bias coil skeleton 3, and the part 3.11 that x fits to the end face of bias coil skeleton 3 with rectangle transfer stitch skeleton 2 is inwardly emptied 0.1 2mm;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, this outer side edges boss there is screwed hole, the position of screwed hole is consistent to the locating slot 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 to rectangular bias coil 9, described x is to the integrated x of the skeleton of rectangular bias coil rack Yu MOT coil to bias coil skeleton 3, a winding bore 3.10 and two lower baffle plate fixing holes 3.4 are had to the front of bias coil skeleton 3 at x, the radius of winding bore is more than the radius of coiling, baffle plate is the aid in winding process, coiling complete after heat sink as coil;
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, and this side through hole boss has through hole 4.5, has the locating slot 4.2,4.4 of 4 MOT coil racks in the inner side below 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 inserted to bias coil skeleton 4 for described y, each inner side edge boss is equipped with two orthogonal screwed holes 5.1,5.3, by pole 7, upper and lower two coils are connected fixing, 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 direction to bias coil 9 with x and is close to, the side of its vertical edge is respectively equipped with two side boss 3.3, 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, being fixed to rectangular bias coil 9 with x by MOT coil by the screwed hole on through hole 4.5 and side boss 3.3 with screw, this x has a winding bore 3.10 on the lateral surface of rectangular bias coil rack 3.
Embodiment is presented herein below further illustrate:
Described transfer stitch 8 and x-axis to bias coil 9 place in the same direction and be nested in inside it. The minimum length of side of this transfer stitch is 29.2mm, and two coils, at a distance of 47.2mm, are obtained by copper wire winding 15 circle 15 layers of 1.2mm diameter. This coil and x-axis to bias coil 9 be nested designs, its skeleton 2 is box-like design, the part 3.11 fitted to coil rack in its skeleton and x-axis is inwardly emptied 0.5mm, to ensure the firm of transfer stitch, and the breach 2.4 of wide 45mm height 30mm is had at the another side of skeleton, make transfer stitch and x-axis fit tightly to bias coil, improve the compactedness of system. The light admission port 2.1 of wide 15mm is had bottom skeleton. The dual-side of skeleton is respectively equipped with outer side edges boss 2.6, and outer side edges boss has screwed hole, and the position of screwed hole is consistent to the locating slot 3.12 on the bias coil skeleton placed with x-axis, is positioned and fixing transfer stitch by two screw thread poles 2.8. The lateral surface of this skeleton has inlet wire groove 2.3 and the line outlet groove 2.2 of a coiling.
Described bias coil is made up of to the bias coil 11 placed and a pair z-axis to the bias coil 12 placed to the bias coil 9 placed and a pair y-axis a pair x-axis. This x-axis is 103.2mm to the minimum length of side of bias coil 9 placed, and two coils, at a distance of 47.2mm, are obtained by copper wire winding 15 circle 15 layers of 1.2mm diameter.Itself and MOT coil 10 are close to, and the skeleton 3 of its skeleton 3 and MOT coil 10 is the integrated design. Having 15mm opening 3.9 in the top of skeleton 3, have the opening 3.13 of 45mm below at it, these openings are used for as vacuum glass pond 1 headspace, it is ensured that skeleton will not encounter vacuum glass pond. Have the locating slot 3.12 of two deep 1mm of wide 3mm in the inner side that its skeleton is following, the inner side of skeleton top has the fixing groove 3.11 of the long 75mm deep 1mm of wide 20mm. And its front has a winding bore 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 after coiling completes, heat sink as coil. This y-axis is vertical to the bias coil 9 placed with x-axis to the bias coil 11 placed, and the minimum length of side is 204.3mm, and two coils, at a distance of 98mm, are obtained by copper wire winding 10 circle 20 layers of 1.3mm diameter. The outside of skeleton 4 vertical edge of this coil is respectively equipped with two side through hole boss 4.1, and side through hole boss has through hole 4.5, in order to fixing MOT coil. And inside the base of its skeleton, have 5 breach, wherein 4 is the locating slot 4.2,4.4 of MOT coil 10, and another breach 4.3 is to ensure that laser beam blocking by skeleton. This z-axis is 258.3mm to the minimum length of side of bias coil 12 placed, and two coils, at a distance of 128.5mm, are obtained by copper wire winding 20 circle 20 layers of 1.3mm diameter. The inner side on the two of which limit of the skeleton 5 of this coil is respectively equipped with two pairs of inner side edge boss 5.2, and y-axis just can be inserted by the spacing of every pair of inner side edge boss to the coil rack 4 placed. Being equipped with two orthogonal screwed holes 5.1,5.3 on each inner side edge boss, wherein the screwed hole 5.1 of level fixes the y-axis coil rack 4 to placement by screw. Perpendicular screwed hole 5.3 on bottom coil skeleton inner side edge boss is in order to firm banking 6, with fixing whole loop construction. Screwed hole on skeleton inner side edge boss by pole 7 by upper and lower two z-axis to coil support and fixing, wherein one end of pole is plus thread, and the other end is left-hand thread. Three pairs of described bias coil center superpositions.
Described MOT coil 10 and x-axis to bias coil 9 place in the same direction and be 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 copper wire winding 20 circle 20 layers of 1.3mm diameter. This coil rack 3 is the integrated design to the bias coil skeleton 3 placed with x-axis, the side of its vertical edge is respectively equipped with two side boss 3.3, side boss there is screwed hole, the position of screwed hole and y-axis are consistent to the through hole on the bias coil skeleton 4 placed, in order to fixing MOT coil 10 and x-axis to bias coil 9 and transfer stitch 8. The lateral surface of skeleton 3 has 3.10, winding slot 3.8 of a winding bore, six baffle plate fixing holes 3.5,3.6.
During for making coiling, wire is better fitted skeleton, and the design of the winding bore 3.7,3.10,4.6,5.4 of all coils skeleton all adopts the design of half-blind hole, i.e. the skeleton core co-planar of the center of circle of winding bore and skeletal internal.
The present invention proposes the rectangle field coil device of a set of nested type, integration so that overall structure is more compact, stable. Field coil all adopts rectangular configuration, utilizes part nested designs, it is achieved that the fixing and combination between various dimensions, multi-coil so that total is more compact, stable, it is simple to integrated and miniaturization. The Helmholtz coil bias magnetic field uniformity to producing is good, and the reverse Helmholtz coil magnetic well well depth to producing is big, and constraint ability is strong. By the control of coil current being realized the movement of magnetic well dead-center position, transfer process controllable precise and avoid in Mechanical Moving mode exist intrinsic vibrations. Take into account in the research of cold atom interferometer the logical light requirement cooling down light, back suction fortune light, pumping light, the detection multi-path laser bundle such as light, beam splitting light.
Claims (2)
1. the rectangle field coil device for Atom Chip interferometer, it is characterised by that it constitutes the rectangle transfer stitch including a pair rectangle Helmholtz coil composition to (8), the MOT coil of a pair anti-Helmholtz coil composition of rectangle is to (10), the x being made up of rectangle Helmholtz coil to bias coil to (9), y to bias coil to (11), z to bias coil to (12), (8) are wound on rectangle transfer stitch skeleton (2) by described rectangle transfer stitch, (10) are wound on x on coil rack (3) by described MOT coil, (9) are wound on x on coil rack (3) to bias coil by described x, (11) are wound on y on bias coil skeleton (4) to bias coil by described y, (12) are wound on z on bias coil skeleton (5) to bias coil by z, x to coil rack (3) for box-like,
(9) are placed in the same direction to bias coil by described rectangle transfer stitch by (8) with x, described rectangle transfer stitch skeleton (2) is nested in the x inside to coil rack (3), and the part (3.11) that x fits to the end face of coil rack (3) Yu rectangle transfer stitch skeleton (2) is inwardly emptied 0.1 2mm; The part gap (2.4) that x fits to coil rack (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), this outer side edges boss there is screwed hole, the position of screwed hole is consistent to the locating slot (3.12) on coil rack (3) with x, by two screw thread poles (2.8), (8) is positioned and is fixed by rectangle transfer stitch;
(10) are close to by described x by (9) and MOT coil to bias coil, a winding bore (3.10) and two lower baffle plate fixing holes (3.4) are had to the front of coil rack (3) at x, the radius of winding bore is more than the radius of coiling, baffle plate is the aid in winding process, coiling complete after heat sink as coil;
Described y is respectively equipped with two sides through hole boss (4.1) to the side of the vertical edge of the skeleton (4) of bias coil, this side through hole boss has through hole (4.5), has 4 x locating slot (4.2,4.4) to coil rack (3) in the inner side below 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 inserted to bias coil skeleton (4) for described y, each inner side edge boss is equipped with two orthogonal screwed holes (5.1,5.3), by pole (7), upper and lower two coils are connected fixing, 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;
(9) are placed to bias coil and are close to by described MOT coil by (10) and x in the same direction, the side of its vertical edge is respectively equipped with two side boss (3.3), 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, (9) being fixed to bias coil with x by MOT coil pair by the screwed hole on through hole (4.5) and side boss (3.3) with screw, this x has a winding bore (3.10) on the lateral surface of coil rack (3).
2. rectangle field coil device according to claim 1, it is characterised in that the winding bore on all skeletons is half-blind hole, i.e. the skeleton core co-planar of the center of circle of winding bore and skeletal internal.
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| CN101592843B (en) * | 2009-06-19 | 2010-10-20 | 中国科学院上海光学精密机械研究所 | Dual magneto-optical trap system |
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