Exploratory electromagnetic thruster research, phase 3, 23 June - 23 December 1969

Performance evaluation of MPD arc jets operating in quasi-steady mode

Theory of Thermal Remagnetization of Permanent Magnets

A self-consistent mean-field theory explaining the thermal remagnetization (TR) of polycrystalline permanent magnets is given. The influence of the environment of a grain is treated by an inclusion approximation, relating the field inside the grain to the local field outside by means of an internal demagnetization factor $n$. For the switching fields and the fluctuations of the local fields around the mean field Gaussian distributions of widths \sigmas and \sigmaf resp. are assumed. The isothermal hysteresis curve, the recoil curves, and the TR in dependence on the model parameters $n$, \sigmas, and \sigmaf are calculated. Furthermore, the influence of the initial temperature and the strong dependence of the TR on the demagnetization factor of the sample are studied, and it is shown that for reasonable parameter sets TR effects up to 100 % are possible. The theoretical results correspond well with the experimental situation.Comment: 28 pages, 9 figures, Latex2e, accepted for publication in JMM

Investigation of pulsed quasi-steady MPD arc jets

Evaluation of magnetohydrodynamic arc thrusters operating in quasi-steady mode with electrode vapor as propellan

Pulsed electromagnetic gas acceleration Seventh semiannual progress report, 1 Jul. - 31 Dec. 1965

Magnetic probe and ion collector study of pulsed plasma propulsion system exhaust jet plum

Pulsed electromagnetic gas acceleration Semiannual progress report, 1 Jul. - 31 Dec. 1968

Pulsed electromagnetic gas acceleratio

Pulsed Electromagnetic Gas Acceleration Eighth Semiannual Progress Report, 1 Jan. - 30 Jun. 1966

Pulsed electromagnetic gas acceleratio

Pulsed electromagnetic gas acceleration Semiannual progress report, 1 Jan. - 30 Jun. 1968

Pulsed electromagnetic plasma acceleration and gas dynamics researc

Quasi-exact-solution of the Generalized Exe Jahn-Teller Hamiltonian

We consider the solution of a generalized Exe Jahn-Teller Hamiltonian in the context of quasi-exactly solvable spectral problems. This Hamiltonian is expressed in terms of the generators of the osp(2,2) Lie algebra. Analytical expressions are obtained for eigenstates and eigenvalues. The solutions lead to a number of earlier results discussed in the literature. However, our approach renders a new understanding of ``exact isolated'' solutions