Laser cooling of ions in a neutral plasma

Langin, Thomas K.; Gorman, Grant M.; Killian, Thomas C.

doi:10.1126/science.aat3158

Laser cooling of ions in a neutral plasma

Journal Article · Thu Jan 03 00:00:00 EST 2019 · Science

DOI:https://doi.org/10.1126/science.aat3158· OSTI ID:1489437

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Laser cooling of a neutral plasma is a challenging task because of the high temperatures typically associated with the plasma state. By using an ultracold neutral plasma created by photoionization of an ultracold atomic gas, we avoid this obstacle and demonstrate laser cooling of ions in a neutral plasma. After 135 microseconds of cooling, we observed a reduction in ion temperature by up to a factor of four, with the temperature reaching as low as 50(4) millikelvin. This pushes laboratory studies of neutral plasmas deeper into the strongly coupled regime, beyond the limits of validity of current kinetic theories for calculating transport properties. The same optical forces also retard the plasma expansion, opening avenues for neutral-plasma confinement and manipulation.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0014455

OSTI ID:: 1489437

Alternate ID(s):: OSTI ID: 1612201

Journal Information:: Science, Journal Name: Science Journal Issue: 6422 Vol. 363; ISSN 0036-8075

Publisher:: American Association for the Advancement of Science (AAAS)Copyright Statement

Country of Publication:: United States

Language:: English

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