Contribution of Coulomb collisions to plasma relaxation in the DECA mirror machine

Abstract

The relaxation of the ion distribution function was measured for a plasma (n ≃ 1012 cm−3, Ēi = 200 eV) confined in a circularized, stabilized magnetic mirror well. The results were compared with the predictions of a Fokker-Planck computer code. The evolution of an initially skewed angular distribution function appeared to be in good accord with the theoretical model. However, the final anisotropy of the plasma was greater than the calculated one.

Experimental Observation on Sloshing-Ion Distribution and Associated Potential-Dip Formation

“…7 The recent issue relevant to the thermal barrier is to produce the sloshing-ion distribution by the injection of neutral beams which can lead to the steady-state formation of the distribution. The behavior of sloshing ions is relatively easily predicted because of small collisionality of sloshing ions characterized by a small ratio of the lifetime limited by the charge-exchange time r cx to the ion-ion scattering time r n , which is of the order of 0.01 for the present-day devices while it is about 0.1 for a large-size machine.…”

Harmonic generation in magnetized plasma for electromagnetic wave propagating parallel to external magnetic field

“…Its absorption leads to plasma heating [11], which is important in several contexts, such as tokamak [12,13], stellarator [14,15], particle * Authors to whom any correspondence should be addressed. acceleration [16,17], microwave heated chemical reactions [18] and mirror machines [19,20]. While high-power lasers have already been available for a long time, the production of high-power microwave (HPM) sources is more recent [21][22][23].…”

CLASSIFICATION OF FOUR-DIMENSIONAL INTEGRABLE HAMILTONIAN SYSTEMS AND POISSON ACTIONS OF $ \mathbb{R}^2$ IN EXTENDED NEIGHBORHOODS OF SIMPLE SINGULAR POINTS. II

“…IT IS an interesting problem related to mirror (LAUNOIS et al, 1972;COENSGEN et al, 1975;I o m et al, 1975;BROWN et al, 1976) and multi-mirror (LOGAN et al, 1974;BUDKER et al, 1974;DANILOV and KRUGLYAKOV, 1976) confinements to investigate behaviors of a plasma flowing along the magnetic field with mirror configuration. In the investigation of the plasma reflection and trapping under such a configuration of magnetic field (KESNER, 1971) it is quite important to know spatial changes of charged-particle orbits which are sensitive to the axial variation of magnetic field (KRAMER and SIANBIS, 1972;LAUREENCE and SIMONEN, 1974;JACQUINOT et al, 1975), collisions, and also microturbulence.…”