Evaporative cooling of a magnetically guided atomic beam

We report on our recent progress in the manipulation and cooling of a magnetically guided, high-flux beam of $^{87}\mathrm{Rb}$ atoms. Typically, $7\ifmmode\times\else\texttimes\fi{}{10}^{9}\phantom{\rule{0.3em}{0ex}}\text{atoms}\phantom{\rule{0.3em}{0ex}}\text{per}\phantom{\rule{0.3em}{0ex}}\text{second}$ propagate in a magnetic guide providing a transverse gradient of $800\phantom{\rule{0.3em}{0ex}}\mathrm{G}∕\mathrm{cm}$ , with a temperature $\ensuremath{\sim}550\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{K}$, at an initial velocity of $90\phantom{\rule{0.3em}{0ex}}\mathrm{cm}∕\mathrm{s}$ . The atoms are subsequently slowed down to $\ensuremath{\sim}60\phantom{\rule{0.3em}{0ex}}\mathrm{cm}∕\mathrm{s}$ using an upward slope. The relatively high collision rate $(5\phantom{\rule{0.3em}{0ex}}{\mathrm{s}}^{\ensuremath{-}1})$ allows us to start forced evaporative cooling of the beam, leading to a reduction of the beam temperature by a factor of 4, and a tenfold increase of the on-axis phase-space density.We report on our recent progress in the manipulation and cooling of a magnetically guided, high-flux beam of $^{87}\mathrm{Rb}$ atoms. Typically, $7\ifmmode\times\else\texttimes\fi{}{10}^{9}\phantom{\rule{0.3em}{0ex}}\text{atoms}\phantom{\rule{0.3em}{0ex}}\text{per}\phantom{\rule{0.3em}{0ex}}\text{second}$ propagate in a magnetic guide providing a transverse gradient of $800\phantom{\rule{0.3em}{0ex}}\mathrm{G}∕\mathrm{cm}$, with a temperature $\ensuremath{\sim}550\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{K}$, at an initial velocity of $90\phantom{\rule{0.3em}{0ex}}\mathrm{cm}∕\mathrm{s}$. The atoms are subsequently slowed down to $\ensuremath{\sim}60\phantom{\rule{0.3em}{0ex}}\mathrm{cm}∕\mathrm{s}$ using an upward slope. The relatively high collision rate $(5\phantom{\rule{0.3em}{0ex}}{\mathrm{s}}^{\ensuremath{-}1})$ allows us to start forced evaporative cooling of the beam, leading to a reduction of the beam temperature by a factor of 4, and a tenfold increase of the on-axis phase-space density.

arXiv:cond-mat/0505709Physical Review ASep 19, 200535 citations

Evaporative cooling of magnetically trapped atomic hydrogen

O.J. Luiten, H. G. C. Werij, M. W. Reynolds +3 more

Physica B Condensed MatterFeb 1, 19943 citations

Evaporation of an atomic beam on a material surface

Gael Reinaudi, Thierry Lahaye, A. Couvert +2 more

We report on the implementation of evaporative cooling of a magnetically guided beam by adsorption on a ceramic surface. We use a transverse magnetic field to shift locally the beam towards the surface, where atoms are selectively evaporated. With a $5\text{\ensuremath{-}}\mathrm{mm}$-long ceramic piece, we gain a factor of $1.5\ifmmode\pm\else\textpm\fi{}0.2$ on the phase-space density. Our results are consistent with a 100% efficiency of this evaporation process. The flexible implementation that we have demonstrated, combined with the very local action of the evaporation zone, makes this method particularly suited for the evaporative cooling of a beam.We report on the implementation of evaporative cooling of a magnetically guided beam by adsorption on a ceramic surface. We use a transverse magnetic field to shift locally the beam towards the surface, where atoms are selectively evaporated. With a $5\text{\ensuremath{-}}\mathrm{mm}$-long ceramic piece, we gain a factor of $1.5\ifmmode\pm\else\textpm\fi{}0.2$ on the phase-space density. Our results are consistent with a 100% efficiency of this evaporation process. The flexible implementation that we have demonstrated, combined with the very local action of the evaporation zone, makes this method particularly suited for the evaporative cooling of a beam.

arXiv:cond-mat/0602069Physical Review AMar 14, 200612 citations

Evaporative Cooling of Trapped Atoms

Wolfgang Ketterle, N. J. van Druten

Advances in atomic, molecular, and optical physicsJan 1, 1996602 citations

We report on our recent progress in the manipulation and cooling of a magnetically guided, high-flux beam of

^{87}\mathrm{Rb}

atoms. Typically, $7\ifmmode\times\else\texttimes\fi{}{10}^{9}\phantom{\rule{0.3em}{0ex}}\text{atoms}\phantom{\rule{0.3em}{0ex}}\text{per}\phantom{\rule{0.3em}{0ex}}\text{second}$ propagate in a magnetic guide providing a transverse gradient of

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

, with a temperature $\ensuremath{\sim}550\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{K}$, at an initial velocity of

90\phantom{\rule{0.3em}{0ex}}\mathrm{cm}∕\mathrm{s}

. The atoms are subsequently slowed down to $\ensuremath{\sim}60\phantom{\rule{0.3em}{0ex}}\mathrm{cm}∕\mathrm{s}$ using an upward slope. The relatively high collision rate $(5\phantom{\rule{0.3em}{0ex}}{\mathrm{s}}^{\ensuremath{-}1})$ allows us to start forced evaporative cooling of the beam, leading to a reduction of the beam temperature by a factor of 4, and a tenfold increase of the on-axis phase-space density.