Physical Review A

Reaching Li7 quantum degeneracy with a minitrap

Ruquan Wang, Mingchang Liu, F. Minardi, Mark A. Kasevich

Published Jan 10, 2007• 24 citations

Abstract

A millimeter-scale Ioffe-Pritchard trap is used to achieve quantum degeneracy in $^{7}\mathrm{Li}$. The trap employs freestanding copper coils integrated onto a direct-bond copper surface-electrode structure. The trap achieves a radial magnetic gradient of $420\phantom{\rule{0.3em}{0ex}}\mathrm{G}∕\mathrm{cm}$, an axial oscillation frequency of $50\phantom{\rule{0.3em}{0ex}}\mathrm{Hz}$, and a trap depth of $66\phantom{\rule{0.3em}{0ex}}\mathrm{G}$ with a $100\phantom{\rule{0.3em}{0ex}}\mathrm{A}$ drive current and $7\phantom{\rule{0.3em}{0ex}}\mathrm{W}$ total power dissipation.

DOI: 10.1103/physreva.75.013610

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Physical Review A

Reaching Li7 quantum degeneracy with a minitrap

Ruquan Wang, Mingchang Liu, F. Minardi, Mark A. Kasevich

Published Jan 10, 2007• 24 citations

Publisher

Abstract

A millimeter-scale Ioffe-Pritchard trap is used to achieve quantum degeneracy in

^{7}\mathrm{Li}

. The trap employs freestanding copper coils integrated onto a direct-bond copper surface-electrode structure. The trap achieves a radial magnetic gradient of

420\phantom{\rule{0.3em}{0ex}}\mathrm{G}∕\mathrm{cm}

, an axial oscillation frequency of

50\phantom{\rule{0.3em}{0ex}}\mathrm{Hz}

, and a trap depth of

66\phantom{\rule{0.3em}{0ex}}\mathrm{G}

with a

100\phantom{\rule{0.3em}{0ex}}\mathrm{A}

drive current and

7\phantom{\rule{0.3em}{0ex}}\mathrm{W}

total power dissipation.

DOI: 10.1103/physreva.75.013610

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Bulletin of the American Physical SocietyMay 17, 20060 citations

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The Ioffe–Pritchard trap is the workhorse of modern cold atom physics. Here, we present a novel Ioffe–Pritchard trap coil configuration based purely on circular coils. By eliminating the traditional Ioffe bars one can increase the gradient and thus the radial trapping frequency by almost a factor 2. We also present a method to achieve minimal coupling between the gradient, curvature and offset fields of the trap, thus facilitating the dynamic control of the trapping frequencies and aspect ratio.The Ioffe–Pritchard trap is the workhorse of modern cold atom physics. Here, we present a novel Ioffe–Pritchard trap coil configuration based purely on circular coils. By eliminating the traditional Ioffe bars one can increase the gradient and thus the radial trapping frequency by almost a factor 2. We also present a method to achieve minimal coupling between the gradient, curvature and offset fields of the trap, thus facilitating the dynamic control of the trapping frequencies and aspect ratio.

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We present a robust continuous optical loading scheme for a Ioffe-Pritchard (IP) type magnetic trap. Atoms are cooled and trapped in a modified magneto-optical trap (MOT) consisting of a conventional 2D-MOT in radial direction and an axial molasses. The radial magnetic field gradient needed for the operation of the 2D-MOT is provided by the IP trap. A small axial curvature and offset field provide magnetic confinement and suppress spin-flip losses in the center of the magnetic trap without altering the performance of the 2D-MOT. Continuous loading of atoms into the IP trap is provided by radiative leakage from the MOT to a metastable level which is magnetically trapped and decoupled from the MOT light. We are able to accumulate 30 times more atoms in the magnetic trap than in the MOT. The absolute number of $2\times 10^8$ ~atoms is limited by inelastic collisions. A model based on rate equations shows good agreement with our data. Our scheme can also be applied to other atoms with similar level structure like alkaline earth metals.We present a robust continuous optical loading scheme for a Ioffe-Pritchard (IP) type magnetic trap. Atoms are cooled and trapped in a modified magneto-optical trap (MOT) consisting of a conventional 2D-MOT in radial direction and an axial molasses. The radial magnetic field gradient needed for the operation of the 2D-MOT is provided by the IP trap. A small axial curvature and offset field provide magnetic confinement and suppress spin-flip losses in the center of the magnetic trap without altering the performance of the 2D-MOT. Continuous loading of atoms into the IP trap is provided by radiative leakage from the MOT to a metastable level which is magnetically trapped and decoupled from the MOT light. We are able to accumulate 30 times more atoms in the magnetic trap than in the MOT. The absolute number of $2\times 10^8$~atoms is limited by inelastic collisions. A model based on rate equations shows good agreement with our data. Our scheme can also be applied to other atoms with similar level structure like alkaline earth metals.

arXiv:quant-ph/0211032Journal of Optics B Quantum and Semiclassical OpticsApr 1, 200330 citations

A millimeter-scale Ioffe-Pritchard trap is used to achieve quantum degeneracy in

^{7}\mathrm{Li}

. The trap employs freestanding copper coils integrated onto a direct-bond copper surface-electrode structure. The trap achieves a radial magnetic gradient of

420\phantom{\rule{0.3em}{0ex}}\mathrm{G}∕\mathrm{cm}

, an axial oscillation frequency of

50\phantom{\rule{0.3em}{0ex}}\mathrm{Hz}

, and a trap depth of

66\phantom{\rule{0.3em}{0ex}}\mathrm{G}

with a

100\phantom{\rule{0.3em}{0ex}}\mathrm{A}

drive current and

7\phantom{\rule{0.3em}{0ex}}\mathrm{W}

total power dissipation.

^{7}

Li BEC in a millimeter-scale Ioffe-Pritchard trap

A near-resonant all-optical }

^{\mathrm{\mathbf{6}}}

\textbf{Li atom trap for few-body experiments

2\times 10^8

~atoms is limited by inelastic collisions. A model based on rate equations shows good agreement with our data. Our scheme can also be applied to other atoms with similar level structure like alkaline earth metals.