Equilibrium of non-neutral plasmas in a Malmberg-Penning trap with quadrupole field errors
- Budker Institute of Nuclear Physics, Lavrentyev Av. 11, Novosibirsk 630090 (Russian Federation)
The effect of small quadrupole magnetic and electrostatic perturbations on the equilibrium of a non-neutral plasma confined in a Malmberg-Penning trap is analyzed on the base of the parallel current constraint derived recently [Kotelnikov and Rome, Phys. Plasmas 15, 072118 (2008)]. The constraint is generalized to the case of nonuniform plasma temperature. Analytical solutions for the electric potential variations inside the trap and Pfirsch-Schlueter currents are found in the paraxial limit for stepwise radial density profiles of the plasma. It is shown that the equilibrium distorted by a magnetic quadrupole is qualitatively different from that perturbed by an electric quadrupole. In particular, a magnetic quadrupole squeeze perturbs the plasma potential only within a localized region, whereas an electric quadrupole squeeze perturbs the potential in the entire plasma column. On the other hand, axially variable parts of the perturbed potential have similar radial profiles for both electric and magnetic quadrupoles.
- OSTI ID:
- 21371231
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 16; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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