A High Intensity Cold Atom Source

Jeremy Glick, William Huntington, Daniel J. Heinzen

Published Jan 1, 2024• 0 citations

Abstract

A method for producing a high intensity cold atomic beam is discussed. The method is based on post-nozzle seeding of lithium into a supersonic helium jet.

DOI: 10.1364/cleo_fs.2024.fm3r.6

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A High Intensity Cold Atom Source

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Publisher

Abstract

A method for producing a high intensity cold atomic beam is discussed. The method is based on post-nozzle seeding of lithium into a supersonic helium jet.

DOI: 10.1364/cleo_fs.2024.fm3r.6

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The authors demonstrate an intense, continuous cold atomic beam generated via postnozzle seeding of a supersonic ${}^{4}$ He jet with ${}^{7}$ Li atoms, which is comparable to the highest flux sources based on laser cooling. The technique could potentially be widely applicable to any paramagnetic atom or molecule.The authors demonstrate an intense, continuous cold atomic beam generated via postnozzle seeding of a supersonic ${}^{4}$He jet with ${}^{7}$Li atoms, which is comparable to the highest flux sources based on laser cooling. The technique could potentially be widely applicable to any paramagnetic atom or molecule.

Physical Review AJan 6, 20239 citations

Capture of a continuous beam of Li atoms in a cryogenic, supersonic helium jet.

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Bulletin of the American Physical SocietyMay 29, 20100 citations

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We demonstrate an intense, continuous cold atom beam generated via post nozzle seeding of a supersonic helium jet with $^7$ Li atoms. The nozzle is cooled to about 4.4 K to reduce the forward velocity of the atoms. The atomic beam is brought to a focus 175 cm from the nozzle by a 10 cm bore diameter magnetic hexapole lens. Absorption and fluorescence imaging of the focus show a flux of $2.3(4) \times 10^{12}$ atoms/s, brightness of $4.1(7)\times 10^{19}$ $\textrm{m}^{-2}\textrm{s}^{-1}\textrm{sr}^{-1}$ , forward velocity of 211(2) m/s, and longitudinal temperature of 7(3) mK. Results agree with a Monte Carlo simulation of the seeding dynamics and a particle tracing simulation of the atom lens. We project that 10 times higher flux would be possible with improved vacuum system design. Our method should provide a useful high-brightness source for atom-optical and other atomic and molecular physics applications.We demonstrate an intense, continuous cold atom beam generated via post nozzle seeding of a supersonic helium jet with $^7$Li atoms. The nozzle is cooled to about 4.4 K to reduce the forward velocity of the atoms. The atomic beam is brought to a focus 175 cm from the nozzle by a 10 cm bore diameter magnetic hexapole lens. Absorption and fluorescence imaging of the focus show a flux of $2.3(4) \times 10^{12}$ atoms/s, brightness of $4.1(7)\times 10^{19}$ $\textrm{m}^{-2}\textrm{s}^{-1}\textrm{sr}^{-1}$, forward velocity of 211(2) m/s, and longitudinal temperature of 7(3) mK. Results agree with a Monte Carlo simulation of the seeding dynamics and a particle tracing simulation of the atom lens. We project that 10 times higher flux would be possible with improved vacuum system design. Our method should provide a useful high-brightness source for atom-optical and other atomic and molecular physics applications.

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The authors demonstrate an intense, continuous cold atomic beam generated via postnozzle seeding of a supersonic

{}^{4}

He jet with

{}^{7}

Li atoms, which is comparable to the highest flux sources based on laser cooling. The technique could potentially be widely applicable to any paramagnetic atom or molecule.

We demonstrate an intense, continuous cold atom beam generated via post nozzle seeding of a supersonic helium jet with

^7

Li atoms. The nozzle is cooled to about 4.4 K to reduce the forward velocity of the atoms. The atomic beam is brought to a focus 175 cm from the nozzle by a 10 cm bore diameter magnetic hexapole lens. Absorption and fluorescence imaging of the focus show a flux of

2.3(4) \times 10^{12}

atoms/s, brightness of

4.1(7)\times 10^{19}

\textrm{m}^{-2}\textrm{s}^{-1}\textrm{sr}^{-1}

, forward velocity of 211(2) m/s, and longitudinal temperature of 7(3) mK. Results agree with a Monte Carlo simulation of the seeding dynamics and a particle tracing simulation of the atom lens. We project that 10 times higher flux would be possible with improved vacuum system design. Our method should provide a useful high-brightness source for atom-optical and other atomic and molecular physics applications.

Cold Beam of

^7

^4

He Dimers

We demonstrate an approach for producing a high flux beam of

^7

^4

He dimers by performing post-nozzle seeding of a lithium beam into a supersonic helium expansion. The molecular beam has a longitudinal temperature of 13(6) mK and a continuous flux on the order of

10^{11}

dimers/s. Monte Carlo simulations of molecular formation based on ab-initio quantum scattering calculations are carried out and compared to the experimentally observed molecular flux. Extensions of this work could lead towards a more quantitative understanding of few-body collision processes of alkali and helium atoms.