[en] New schemes are proposed for obtaining effective interaction between coherent electromagnetic wave and free electrons, both being traveling across the magnetic field. These schemes use the principle of the Vsub(p) x B acceleration of electrons originally observed in the plasma. Potential applications of the schemes are optical particle accelerators without using plasma. (author)

[en] The possibility of using massive quantities of injected deuterium with and without additional admixture of lesser quantities of higher-Z impurities to effect fast thermal shutdown of a tokamak discharge without causing runaway electron avalanching is systematically studied. It is found that various combinations of deuterium alone and deuterium with impurities (helium, nitrogen, argon, and krypton) can provide acceptable runaway-free thermal shutdown. The admixture of impurities cited reduces the quantity of deuterium needed and also reduces the radiative cooling time needed for the plasma to reach final thermal equilibrium, where radiation losses balance ohmic input. In contrast, the addition of neon does not appreciably reduce deuterium quantity or promote faster cooling. This difference relative to the other impurity studies can be understood from the radiation versus plasma temperature characteristics for neon

[en] The electrostatic ion stoppering at the mirror point is demonstrated experimentally in a magnetic mirror field. The ion losses from the mirror throat are decreased to about 15% of the initial losses in a rather high plasma density (10¹⁰ < n₀ <= 10¹³ cm^-3). It is discussed as a confinement mechanism of ions that particles are reflected back adiabatically at the throat of the magnetic mirror field supplemented by DC electric field. (auth.)

[en] Strong heating and improved confinement of ions have been observed in an axisymmetric magnetic mirror field supplemented with an electrostatic DC field across and along the magnetic field lines. The increased life time of ions is understood as trapping of ions in the electrostatic potential well in the magnetic mirror field. The efficient heating of ions is resulted from the thermalization through weak collisions and/or finite correlation time of the strong EXB type instabilities excited by the radial current flowing into the outer electrode. The ion temperature increases in proportion to Vsub(H)², the square of the applied DC voltages for heating. (author)

[en] Two-color quantum chromodynamics (QCD with N_c=2) at finite temperature T and chemical potential μ is revisited in the strong coupling limit on the lattice with staggered fermions. The phase structure in the space of T, μ, and the quark mass m is elucidated with the use of the mean field approximation and the 1/d expansion (d being the number of spatial dimensions). We put special emphasis on the interplay among the chiral condensate < q-barq>, the diquark condensate < qq>, and the quark density < q^†q> in the T-μ-m space. Simple analytic formulae are also derived without assuming μ nor m being small. Qualitative comparisons are made between our results and those of recent Monte-Carlo simulations in 2-color QCD

No abstract available

[en] A new type electron linear accelerator, based on v_pxB acceleration mechanism observed originally in plasma, has been demonstrated in vacuum. In this scheme a static magnetic field is applied vertically to the wave propagating direction and the particles are accelerated along the wave front at constant phase with respect to the wave. The linac consists of electron gun, magnetron for a RF source, slow wave structure and a pair of coil for an applied magnetic field. Energy gain of 12.8 keV is observed at an initial energy of 66 keV when an external magnetic field of 2.5 G is applied. The energy gain is 30 % higher than that of a conventional linac. The output energy increment is proportional to the square of the applied magnetic field B. The comparisons between the experimental and theoretical values are given. (author) 10 refs., 4 figs

[en] Behavior of multiple ion acoustic solitons at the plasma sheath edge is experimentally investigated. We present experimental results which show the evidence of new mechanism for the compression phenomenon of multiple ion acoustic solitons. These characteristics are similar to the calculated results which employed a particle model for the pulse. (author) 7 refs., 2 figs

No abstract available

No abstract available