This contribution presents recent results of pellet technologies development for plasma fuelling in magnetic confinement machines with open or closed magnetic configuration. The current status of ITV7 pellet injector for GOL3 multimirror linear machine, PGS2.2 pellet guide system of ITV4 in-situ pellet injector for TUMAN-3M tokamak and ITV5 centrifuge pellet injector for Globus-M spherical tokamak is reported New results on modeling of tangential pellet injection into TUMAN-3M tokamak are discussed as well.

The high-power hot plasma stream of E-beam heated plasma in the GOL-3 facility is used for exploratory plasma stream-target interaction experiments under conditions rather typical for the thermal quench phase of ITER tokamak plasma disruptions. The recent experimental results are presented.

A diagnostic technique for monitoring the plasma flow-induced thin target expansion is described. The technique involving an X-ray image converter tube (XICT) was employed in GOL-3 facility experiments.

The GOL-3 facility was used for exploratory plasma stream target experiments under conditions rather typical for the thermal quench phase of ITER tokamak plasma disruptions. The experiments allowed study of the properties of target plasmas formed from vaporized target materials in front of the target and determination of the target material erosion. Within 2 μs after the onset of the plasma stream a cloud of evaporated material is formed. The cloud expands along magnetic force lines with velocities around 106 cm/s. Line radiation is observed from the target plasma corona, continuum radiation from the bulk cloud is below 0.5 eV. The erosion for graphite increases sharply upon reaching a threshold value of 1 MJ/m2 for the energy density of the hot plasma stream and achieves very high values.

The diagnostic instrumentation of the GOL-3 facility is described. The facility is dedicated to the microsecond-REB plasma heating study. Depending on experimental conditions, the plasma parameters are the following: 10(14) - 10(17) cm(-3) density, 1 - 1000 eV temperature, several microseconds - tens of microseconds lifetime. The 1 MeV, 40 kA, 3 - 5 mu s REB parameters are measured both at the input to and at the output from the zone of REB-plasma interaction.

Diagnostics of a surface plasma produced by a high-power (about 2 MW/cm2) hot plasma flow interaction with a solid surface are described.

Results of experimental study of a plasma-filled diode are presented. The diode was filed by a plasma from plasma guns. Two different regimes were tested. In the first one the plasma cloud was localized at the anode region. In this case there were not found a stable low impedance mode of a diode operation. In the second regime the diode was filled by plasma completely before a high voltage pulse and an additional plasma cloud was also created in the drift region. In this regime a low impedance accelerating gap, stable

Experiments on a microsecond E-beam (1 MV, 50 kA, 60 kJ) interaction with a bremsstrahlung converter are described. A thin foil placed between strong magnetic mirrors is used as a target. Multiple passage of the electrons through the thin foil increase bremsstrahlung yield in the low-energy (<;50 keV) range of spectrum. Testing of the suggested converter has been carried out. The effect of oscillating electrons on the microsecond diode operation is discussed. It is found that the target with thickness equal to 0.05 of the mean range absorbes the beam practically totally. The time-resolved measurements of X-ray emission uniformity are also presented.

New results are presented on studying the beam-plasma interaction and plasma heating dynamics at the INAR device. The specific features of the generation of 'hot' (E>approximately 1keV) plasma electrons containing the main part of the plasma energy are studied. In the case of a beam with a small initial angular spread, the 'hot' electrons are mainly generated near the point where the beam is injected into the plasma. Also reported are the results of the experiments in which the magnetic field in the beam-plasma interaction region was increased up to 70 kOe. In this case, at the plasma length of 75 cm, the total beam energy losses exceed 40%. The growth of the plasma energy content at higher magnetic field is observed. The first stage of the GOL-3 experiment is described which is aimed at the study of the plasma heating of a solenoid by a 100 kJ microsecond electron beam. This experimental device is ready for operation.