Ion friction at small values of the Coulomb logarithm
ORAL
Abstract
We create a dual-species ultracold neutral plasma (UNP) by photo-ionizing Yb and Ca atoms in a dual-species magneto-optical trap. Unlike single-species UNP expansion, these plasmas are well outside of the collisionless (Vlasov) approximation. We observe the mutual interaction of the Yb and Ca ions by measuring the velocity distribution for each ion species separately. We model the expansion using a fluid code including ion-ion friction and compare with experimental results to obtain a value of the Coulomb logarithm of 0.04
*We acknowledge support from Air Force Office of Scientific Research under program AFOSR FA9550-17-1-0302 and National Science Foundation under grant number NSF PHY1500376
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Presenters
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Robert Tucker Sprenkle
- Brigham Young University - Provo
- Brigham Young University