Mainz 2022 – scientific programme
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P: Fachverband Plasmaphysik
P 19: Poster II
P 19.31: Poster
Thursday, March 31, 2022, 16:00–17:30, P
Global thermal equilibrium of non-neutral plasma in a magnetic quadrupole trap — •Patrick Steinbrunner1, Matthew Stoneking2, Thomas O'Neil3, and Thomas Sunn Pedersen1 — 1Max Planck Institute for Plasma Physics, 17489 Greifswald, Germany — 2Lawrence University, Appleton, Wisconsin 54911, USA — 3University of California, San Diego, La Jolla, California 92093, USA
Global thermal equilibrium of a non-neutral plasma confined in a cylindrically symmetric trap is obtained by maximizing the entropy for a given number of particles, temperature and rotation frequency around the axis of symmetry [1]. Plasmas in such states are Boltzmann distributed and satisfy Poisson*s equation as it is observed in Penning-Malmberg traps, in which they are in principle confined indefinitely [1]. These traps consists of a homogeneous magnetic field as well as electrostatic potential walls produced by cylindrical electrodes. They can confine one sign of charge, and the amount of confined space charge is limited by the bias on the electrodes. We present an alternative concept using a magnetic quadrupole field, produced by a levitated current-carrying coil surrounded by another coil with opposite current wound around a grounded vacuum chamber. Computational results suggest that global thermal equilibrium states can be confined in this trap without the need of biased electrodes. Turning off the outer coil*s current would yield a dipole trap [2] in which both signs of charge have been confined for a finite time. [1] Dubin, D. H., & O*neil, T. M. (1999). Rev. Mod. Phys., 71(1), 87. [2] Boxer, A. C., et al. Nat. Phys., 6.3 (2010): 207-212.