Physics of REB–Plasma Interaction

Studies of high-current relativistic electron beam interaction with gas and plasma in Novosibirsk

“…To measure the energy spectrum of the plasma electrons, the 90° and 8° Thomson scattering systems and a multi-foil analyzer were used. 8,17 As can be seen in Fig. 5, the electron energy distribution function obtained in these measurement 8 has a high-energy tail that decreases inversely proportional to the electron energy to the power of ~ 2.5 -2.7.…”

“…Important evidence of the role of this instability in the beam-plasma interaction comes from the measurements of the energy deposition in the plasma as a function of the angular spread of the beam electrons. 7 Figure 3 demonstrates that the energy transfer from the beam to the plasma is roughly inversely proportional to the square of the angular spread of the beam electrons. Moreover, a strong non-uniformity of the energy transfer along the beam path is observed experimentally: The efficiency of interaction is maximal near the entrance of the beam to the plasma (where the angular spread of the beam is the smallest) and reduces along the beam path.…”

“…This development of the beam generation technology was motivated by the application of REBs for fast plasma heating in open magnetic traps. Experimental studies on such application of the electron beams were carried out at the INAR device (1971 -1985), 7,8 REBEX machine (1978 -1990), 9 GOL-1M facility (1971 -2005), 10 and GOL-3 facility (1987 -2014). 11 As a result of these experiments, it was established that the plasma temperature dramatically increased during the microsecond beam injection and achieved several keV for the plasma density about 10 15 cm -3 .…”

Beam-plasma system as a source of powerful submillimeter and terahertz radiation (experimental and theoretical studies)

“…From other hand, such beam-plasma systems are very attractive for the development of generators of radiation in millimeter and submillimeter ranges [3,4]. Motivated by these circumstances, we study the systems in laboratory experiments since 70-th of the past century [5]. Past five years this activity was concentrated on experiments to study electromagnetic wave emission from the beam-plasma system in the frequency interval 0.1-0.7 THz.…”

“…Since 2014 these studies are continued at the GOL-PET device [4]. The experimental research is accompanied by theoretical investigations at appropriate the beam and plasma parameters [5,6]. The presented paper describes results of the experiments for the EM-wave emission from the beam-plasma system in the frequency interval 0.1-0.5 THz and of the theoretical studies for the process of plasma wave transformation into electromagnetic radiation in a frame of analytical models and computer simulations for suitable beam and plasma parameters.…”