EP1130949B1 - Dispositif électromagnetique pour la production d'atomes froids - Google Patents
Dispositif électromagnetique pour la production d'atomes froids Download PDFInfo
- Publication number
- EP1130949B1 EP1130949B1 EP01400460A EP01400460A EP1130949B1 EP 1130949 B1 EP1130949 B1 EP 1130949B1 EP 01400460 A EP01400460 A EP 01400460A EP 01400460 A EP01400460 A EP 01400460A EP 1130949 B1 EP1130949 B1 EP 1130949B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- poles
- electromagnetic device
- neutral atoms
- producing cold
- atoms according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title description 3
- 230000007935 neutral effect Effects 0.000 claims description 13
- 230000005294 ferromagnetic effect Effects 0.000 claims description 8
- 230000005284 excitation Effects 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000005291 magnetic effect Effects 0.000 description 9
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 239000003302 ferromagnetic material Substances 0.000 description 3
- 235000013379 molasses Nutrition 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 108010083687 Ion Pumps Proteins 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000002648 laminated material Substances 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000028016 temperature homeostasis Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H3/00—Production or acceleration of neutral particle beams, e.g. molecular or atomic beams
- H05H3/02—Molecular or atomic beam generation
Definitions
- the present invention relates to the field of production of cold neutral atoms by magnetic trapping.
- the invention relates more particularly to a electromagnetic device for the production of atoms cold neutrals comprising a ferromagnetic structure presenting 4 poles arranged in the same plane XOY excited by main coils (the quadrupole) providing the main excitation, and two additional poles (the dipole) oriented along an axis Z perpendicular to the plane said four poles, the poles being coupled magnetically by one or more cylinder heads.
- a ferromagnetic structure presenting 4 poles arranged in the same plane XOY excited by main coils (the quadrupole) providing the main excitation, and two additional poles (the dipole) oriented along an axis Z perpendicular to the plane said four poles, the poles being coupled magnetically by one or more cylinder heads.
- the invention relates in its most general sense to a device having additional poles consisting of a external structure and an internal structure excited separately by two coils traversed by currents otherwise.
- This device constitutes a trap of Ioffé-Pritchard compensated bias for trapping and / or realization of a coherent source of cold atoms (Bose-Einstein condensates), making it possible to high compression ratio with low consumption electric. It allows continuous or pulsed operation with cut-off times of 100 microseconds. It allows also an adjustment of the magnetic fields produced by the different coils by a current adjustment browsing the coils of excitement.
- the additional poles are formed by a substantially cylindrical core having a end dug by a coaxial annular cavity to inside which is housed the excitation coil interior.
- certain poles less have a sleeve with a tubular channel for the circulation of a thermoregulation fluid.
- said sleeve is surrounded by the compensation coil.
- the cylinder heads are constituted a first annular element extending over 180 ° extended to each end by second annular members extending over 90 °, in a plane perpendicular to the plane of the first element, each of said second annular elements being coupled to an annular element extending over 180 ° in a plane perpendicular to the other elements ring.
- the yokes and poles are made of a material ferromagnetic limiting eddy currents, in particular a laminated ferromagnetic material or sintered materials.
- the breech has a annular lamination perpendicular to the lamination of poles.
- the end of certain poles at less has a beveled shape.
- FIG. 1 represents a view of a first variant embodiment.
- the device consists of two elements of two yokes (1, 2) of toric shape, and by six elements polar (3 to 8) radial.
- the yokes (1, 2) are formed by winding a strip of ferromagnetic material.
- the cylinder heads have different radii to allow the interlocking of the breech inside the breech the two cylinder heads (1, 2) with plans medians perpendicular.
- the first cylinder head (1) is placed in the YOZ plane.
- the second cylinder head (2) is placed in the XOZ plane.
- the four poles (3,5,7,8) are placed in the XOY plane. They are formed by a nucleus ferromagnetic made of a laminated material, surrounded by a coil (13,17,15,18) in copper tube providing the main excitation, and by an additional coil not shown in the figure, providing a field of compensation of the residual fields.
- the last two poles (4, 6) are oriented along the Z axis and consist of a ferromagnetic core made of a laminated material surrounded by an outer coil (14 and 16). These two poles (4, 6) further comprise an internal coil (27, 28) traversed by a current in the opposite direction of the current flowing through the external coil.
- the external structure creates a field of the same shape which will make it possible to compensate B 0 while keeping a high value for C.
- the device further comprises quadrupole (3, 5, 7, 8) a dipole formed of two poles (4,6) arranged along the axis z, of which FIG. 2 represents a view detailed, in longitudinal section.
- This dipole has for function the constant field compensation in the center of the trap to produce significant containment, and allowing to obtain pulse rates greater than 0.01 hertz, of the order of the hertz.
- the poles of the dipole comprise a core (31) laminated have a frustoconical end (30).
- the core has an axial cavity (32) of annular form in which is housed a coil electric motor (35) surrounding a cylindrical core (31).
- the main core (31) is surrounded by a first main coil (14, 16) (Fig.1) and a coil of compensation of the residual fields (37).
- the main coils (36) and the coil (35) are fed in series and in opposition in pulse mode.
- the coils of one of the poles and the coils of the complementary pole vis-à-vis are itself connected for a series supply, in the same direction and no longer in opposition.
- the secondary field compensation coil remanent (37) is mounted on a structure of thermostabilisation (38) ring-shaped, surrounding the central part of the pole (31).
- This annular structure (38) has an annular channel (39) for circulation a thermostatic fluid.
- the set of coils is powered by a pulse current with a power of about 150 W to produce a gradient of the order of 2400 gauss per centimeter, with a merit factor F of the order of 80,000.
- the inter-pole distance is of the order of 4 centimeters.
- the diameter of the poles is of the order of 20 millimeters.
- a cylindrical cell with a diameter of 25 millimeters is placed in this space.
- Figure 3 shows a variant of realization of a structure for trapping cold atoms.
- the ferromagnetic structure is composed of two semi-circular rings (50, 51) arranged in perpendicular planes. These two arches (50, 51) are connected by quadrant hoops (52, 53) whose ends are coupled respectively to the ends of the semicircular arches (50, 51). These arches (52, 53) in quarter circle are in a third XOY plane perpendicular to the intersection of the two above-mentioned planes.
- the semicircular arches (50, 51) are each coupled with an additional pole (60, 61) extending radially. These poles (60, 61) are surrounded by a thermostabilizing structure.
- the main excitement is provided by the coils (66, 67) and (68, 69) distributed over the semicircular hoop (50, 51) on both sides of the secondary pole (60, 61). They are covered by contrary currents.
- the devices according to the invention make it possible to generate a very steep magnetic potential, and adjustable.
- Figure 4 shows an example of equipment implementing a device according to one or other of the variants of the invention.
- the equipment comprises a recirculating furnace (100) heated to about 140 ° C to produce an atomic charge 87 Rb.
- a 2D optical molasses produced by a transverse laser beam produces collimation of the jet and allows it to be oriented in the axis of a tube (101).
- This tube (101) opens into a primary chamber (102) connected to a vacuum pump (103).
- the pressure P 1 prevailing in the enclosure (102) is about 10 -9 millibar.
- the pump is a turbo pump having a high compression ratio (greater than 19 9 for nitrogen).
- the enclosure (102) is provided with a cold cathode gauge (105) for measuring the pressure.
- Molasses is obtained by laser diodes of power 50 to 100 mW and a master laser of 3.5 mW at 780 nm with a linewidth of 1 Mhz.
- a part of laser beams counter-propagating detuned towards the red of the transition atomic produces a force of radiation pressure on the illuminated atom.
- a cold cylinder is positioned in the enclosure, to ensure the bonding of non-atoms collimated. It is formed by a metal block pierced with a hole of 10 millimeters in diameter. He only lets in the atoms of the jet emitted on the axis. This cylinder is cooled by a flexiplunner (106) which ensures circulation ethylene glycol at -55 ° C.
- a valve (107) isolates the enclosure secondary.
- An ion pump (108) provides the vacuum intermediate through a slowing tube (109). This slowing tube (109) isolates thermally the oven (100) of the secondary enclosure (112).
- the secondary enclosure (112) consists of a cell in 1x2 cm glass connected to an ion pump (113) and a titanium enhancer. The walls are periodically heated to compensate for the formation of steam Rubidium.
- the electromagnetic trap (120) according to the invention is placed at the exit of a retarder (118) having an electric coil (119).
- Figure 5 shows the time sequence equipment.
- the different stages of a cycle of operation are synchronized.
- the quadrupole field spherical produced by the main poles is interrupted and the clash of trap beams is increased prior to the cutoff of the splintering beam.
- the lateral repeater beams stay on.
- the compensation of the residual fields for demagnetization of the ferromagnetic structure allows to obtain efficient cooling.
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Particle Accelerators (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Electromagnets (AREA)
Description
- la figure 1 représente une vue schématique d'une première variante de réalisation d'un dispositif selon l'invention ;
- la figure 2 représente une vue en coupe médiane d'un pôle additionnel, à une échelle agrandie ;
- la figure 3 représente une variante de réalisation d'un dispositif selon l'invention.
- la figure 4 représente une vue schématique d'un équipement mettant en oeuvre un dispositif selon l'invention.
- la figure 5 représente le cycle de fonctionnement d'un dispositif selon l'invention.
Claims (10)
- Dispositif électromagnétique pour la production d'atomes neutres froids comprenant une structure ferromagnétique présentant 4 pôles (3, 5, 7, 8) disposés dans un même plan XOY excités par des bobines principales (13, 15, 17, 18) fournissant l'excitation principale, et deux pôles additionnels (4, 6) orientés selon un axe Z perpendiculaires au plan desdits quatre pôles, les pôles étant couplés magnétiquement par une ou plusieurs culasses (1, 2), caractérisé en ce que chacun desdits pôles additionnels (4, 6) est constitué par une structure externe et d'une structure interne excités séparément par deux bobines (35, 37) parcourues par des courants contraires.
- Dispositif électromagnétique pour la production d'atomes neutres froids selon la revendication 1 caractérisé en ce que les pôles additionnels sont formés par un noyau sensiblement cylindrique présentant une extrémité creusée par une cavité annulaire coaxiale à l'intérieure de laquelle est logée la bobine d'excitation intérieure.
- Dispositif électromagnétique pour la production d'atomes neutres froids selon la revendication 1 ou 2 caractérisé en ce que certains pôles au moins présentant un manchon pourvu d'un canal tubulaire pour la circulation d'un fluide de thermorégulation.
- Dispositif électromagnétique pour la production d'atomes neutres froids selon la revendication 3 caractérisé en ce que certains pôles au moins sont entourés par une bobine de compensation des champs rémanents.
- Dispositif électromagnétique pour la production d'atomes neutres froids selon l'une quelconque des revendications précédentes caractérisé en ce que les culasses sont constituées par deux éléments annulaires de rayon Rint et Rext avec Rext = Rint + E où E désigne l'épaisseur de la culasse, les deux éléments étant emboítables et positionnés dans deux plans perpendiculaires.
- Dispositif électromagnétique pour la production d'atomes neutres froids selon l'une quelconque des revendications précédentes caractérisé en ce que la culasse est constituée d'un premier élément annulaire s'étendant sur 180° prolongé à chaque extrémité par des seconds éléments annulaires s'étendant sur 90°, dans un plan perpendiculaire au plan du premier élément, chacun desdits seconds éléments annulaires étant couplés à un élément annulaire s'étendant sur 180° dans un plan perpendiculaire aux autres éléments annulaires.
- Dispositif électromagnétique pour la production d'atomes neutres froids selon la revendication précédente caractérisé en ce que les seconds éléments annulaires s'étendant sur 90° sont entourés chacun par une bobine d'excitation des pôles principaux.
- Dispositif électromagnétique pour la production d'atomes neutres froids selon l'une quelconque des revendications précédentes caractérisé en ce que les culasses et les pôles sont constitués en un matériau limitant les courants de Foucault.
- Dispositif électromagnétique pour la production d'atomes neutres froids selon l'une quelconque des revendications précédentes caractérisé en ce que l'extrémité de certains pôles au moins présente une forme tronconique.
- Dispositif électromagnétique pour la production d'atomes neutres froids selon l'une quelconque des revendications précédentes caractérisé en ce que les pôles présentent en outre des bobines secondaires pour la compensation des champs rémanents.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0002704 | 2000-03-02 | ||
FR0002704A FR2805959B1 (fr) | 2000-03-02 | 2000-03-02 | Dispositif electromagnetique pour la production d'atomes neutres froids |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1130949A1 EP1130949A1 (fr) | 2001-09-05 |
EP1130949B1 true EP1130949B1 (fr) | 2005-09-07 |
Family
ID=8847657
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01400460A Expired - Lifetime EP1130949B1 (fr) | 2000-03-02 | 2001-02-22 | Dispositif électromagnetique pour la production d'atomes froids |
Country Status (4)
Country | Link |
---|---|
US (1) | US6548809B2 (fr) |
EP (1) | EP1130949B1 (fr) |
DE (1) | DE60113171T2 (fr) |
FR (1) | FR2805959B1 (fr) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11580435B2 (en) | 2018-11-13 | 2023-02-14 | Atom Computing Inc. | Scalable neutral atom based quantum computing |
US11586968B2 (en) | 2018-11-13 | 2023-02-21 | Atom Computing Inc. | Scalable neutral atom based quantum computing |
US11797873B2 (en) | 2020-03-02 | 2023-10-24 | Atom Computing Inc. | Scalable neutral atom based quantum computing |
US11875227B2 (en) | 2022-05-19 | 2024-01-16 | Atom Computing Inc. | Devices and methods for forming optical traps for scalable trapped atom computing |
US11995512B2 (en) | 2018-11-13 | 2024-05-28 | Atom Computing Inc. | Scalable neutral atom based quantum computing |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10220757B4 (de) * | 2002-05-08 | 2004-06-24 | Westfalia Separator Ag | Zentrifuge, insbesondere Separator |
US7126112B2 (en) * | 2004-03-10 | 2006-10-24 | Anderson Dana Z | Cold atom system with atom chip wall |
CN1333622C (zh) * | 2004-12-02 | 2007-08-22 | 清华大学 | 一种冷原子束产生方法及其装置 |
CN100376123C (zh) * | 2005-01-13 | 2008-03-19 | 清华大学 | 一种原子芯片用原子束发生方法及其装置 |
JP4862202B2 (ja) * | 2006-03-08 | 2012-01-25 | 独立行政法人情報通信研究機構 | 中性原子のトラップ装置 |
US7709807B2 (en) * | 2007-05-31 | 2010-05-04 | United States Of America As Represented By The Secretary Of Commerce, The National Institute Of Standards And Technology | Magneto-optical trap ion source |
FR2928725B1 (fr) * | 2008-03-12 | 2010-04-09 | Centre Nat Rech Scient | Capteur interferometrique a atomes froids |
EP2104406B1 (fr) | 2008-03-19 | 2015-08-12 | Ixblue | Source d'atomes cohérents guidés et interféromètre atomique comprenant celle-ci |
US8237105B1 (en) | 2011-02-03 | 2012-08-07 | Northrop Grumman Guidance & Electronics Company, Inc. | Magneto-optical trap for cold atom beam source |
US9134450B2 (en) | 2013-01-07 | 2015-09-15 | Muquans | Cold atom gravity gradiometer |
US10446307B2 (en) * | 2017-05-23 | 2019-10-15 | AOSense, Inc. | Magnetic field generators based on high magnetic permeability materials |
CN108770177B (zh) * | 2018-07-16 | 2019-08-20 | 北京航空航天大学 | 空芯反共振光纤冷原子束流导引与通量探测方法及装置 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6476383B1 (en) * | 1999-08-31 | 2002-11-05 | Max-Planck-Gesellschaft Zur Forderung Der Wissenschaften E.V. | Device and method for generating and manipulating coherent matter waves |
-
2000
- 2000-03-02 FR FR0002704A patent/FR2805959B1/fr not_active Expired - Fee Related
-
2001
- 2001-02-22 EP EP01400460A patent/EP1130949B1/fr not_active Expired - Lifetime
- 2001-02-22 DE DE60113171T patent/DE60113171T2/de not_active Expired - Lifetime
- 2001-03-02 US US09/796,698 patent/US6548809B2/en not_active Expired - Fee Related
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11580435B2 (en) | 2018-11-13 | 2023-02-14 | Atom Computing Inc. | Scalable neutral atom based quantum computing |
US11586968B2 (en) | 2018-11-13 | 2023-02-21 | Atom Computing Inc. | Scalable neutral atom based quantum computing |
US11995512B2 (en) | 2018-11-13 | 2024-05-28 | Atom Computing Inc. | Scalable neutral atom based quantum computing |
US11797873B2 (en) | 2020-03-02 | 2023-10-24 | Atom Computing Inc. | Scalable neutral atom based quantum computing |
US11875227B2 (en) | 2022-05-19 | 2024-01-16 | Atom Computing Inc. | Devices and methods for forming optical traps for scalable trapped atom computing |
Also Published As
Publication number | Publication date |
---|---|
US20010042824A1 (en) | 2001-11-22 |
US6548809B2 (en) | 2003-04-15 |
EP1130949A1 (fr) | 2001-09-05 |
FR2805959A1 (fr) | 2001-09-07 |
DE60113171D1 (de) | 2005-10-13 |
DE60113171T2 (de) | 2006-06-22 |
FR2805959B1 (fr) | 2002-04-12 |
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