[en] This is a paper about calculating plasma physics in which we refer to the method given by (1) and (4) to solve a complex second-order eigen differential equation and integral equation in plasma physics, the numerical techniques and code are included. (author). 4 refs

[en] This is a brief overview of the START (Small Aspect Ratio Tokamak) experiment that has become operational in January 1991 and that is aimed at investigating the confinement ramifications of small aspect ratio. The main parameters and the diagnostics facilities are listed. Plasma formation, energy confinement, MHD properties and plasma exhaust aspects are discussed. 7 refs, 7 figs, 3 tabs

[en] This is a very brief account of experiments on the SINP tokamak involving the application of external resonant magnetic field perturbations for the suppression or minimization of loop voltage spikes. Magnetic probe measurements show an extended locked mode type of activity, while powering the coils in very-low-q(a) discharges reduces the low-frequency components but increases the high-frequency components. 1 ref., 2 figs

[en] An increase of line average electron density was observed in several experiments in CASTOR tokamak, namely in the lower hybrid current drive (LHCD) discharges and in a limiter biasing (BL) experiments. Such behaviour of the density can be attributed to an improvement of particle confinement. A simple code is used to estimate the particle confinement time τ_p and a weight coefficient is introduced to evaluate an effect of the recycling at the limiter, which is a significant source of particles. (author). 7 refs, 4 figs

[en] This document consists of a collection of papers presented at the IAEA Technical Committee Meeting on Research Using Small Tokamaks. It contains 22 papers on a wide variety of research aspects, including diagnostics, design, transport, equilibrium, stability, and confinement. Some of these papers are devoted to other concepts (stellarators, compact tori). Refs, figs and tabs

[en] This is a very brief report on the recommissioning of the COMPASS tokamak following conversion from a bellows-type circular cross-section vacuum vessel to a smooth-walled (still continuous) D-shaped vessel for the purpose of experimentation aimed at controlling MHD activity in strongly elongated tokamaks, both with and without divertors. Comments are included on the toroidal resistance and on a vertical feedback control system. A less triangular shape of the magnetic field configuration was chosen to allow more clearance for the high-field-side ECRH mirror-antenna. At the time of this communication the Resonant Magnetic Perturbation system was expected to be recommissioned shortly, while commissioning of the 60 GHz ECHR system was progressing well. Early experimental results have already been obtained. 3 refs, 5 figs

[en] A strong reduction of monitored hard X-ray intensity is observed during lower hybrid current drive (LHCD) at the Castor tokamak. We interpret it as an improvement of the runaway electron confinement. This supposition is reinforced by observation of a decreased of magnetic fluctuations level during LHCD phase of the discharge. (author). 6 refs, 6 figs

[en] Various models have been used to understand and improve the discharge behaviour of SINP tokamak, a small research tokamak. This has allowed us to achieve for the first time full designed parameters of this tokamak. To achieve this a low cost audio frequency discharge cleaning system using single turn primary was developed. The plasma current rise has been slowed down. A low cost soft- x-ray imaging system has shown very pronounced sawtooth oscillation in these discharges. (author). 7 refs, 7 figs

[en] Spatially and temporally localized enhanced emission was detected in the radiation of the MT-1M tokamak plasma following the injection of high fluence sodium beam and glass micropellets. In the case of sodium injection this effect was observed not only at the toroidal cross-section of the beam, but also at 60 deg. C displaced from it. The presence of an ion packet travelling along magnetic field lines for long distances may give some qualitative explanation to the experimental findings. (author). 8 refs, 5 figs

[en] Basic studies of very-low-q (1 < q_a < 2) discharges have been done on REPUTE-1Q device. In the very-low-q discharges relatively high electron temperature was observed (by soft x-ray pulse height analysis) and it was confirmed that the resistance has appreciable anomaly. The relatively high electron temperature may be due to anomalous heating of electrons by the excess power through the resistance anomaly. (author). 10 refs, 6 figs