TY - JOUR

T1 - Electron beam-plasma discharge in GDT mirror trap: Experiments on plasma start-up with electron gun

AU - Солдаткина, Елена Ивановна

AU - Пинженин, Егор Игоревич

AU - Коробейникова, Ольга Алексеевна

AU - Максимов, В.В.

AU - Яковлев, Дмитрий Вадимович

AU - Соломахин, Александр Леонидович

AU - Савкин, В.Я.

AU - Колесниченко, Константин Сергеевич

AU - Иванов, Александр Александрович

AU - Трунев, Юрий Александрович

AU - Воскобойников, Ренат Владимирович

AU - Шульженко, Г.И.

AU - Анненков, Владимир Вадимович

AU - Волчок, Евгения Павловна

AU - Тимофеев, Игорь Валериевич

AU - Багрянский, Петр Андреевич

N1 - The work is carried out within the framework of the state assignment of the INP SB RAS (№ 0241-2021-0018). I.V.Timofeev is supported by the Foundation for the Advancement of Theoretical Physics and Mathematics "BASIS". Publisher Copyright: © 2022 IAEA, Vienna.

PY - 2022/6/1

Y1 - 2022/6/1

N2 - The paper describes experiments on the injection of an electron beam into a gas at the Gas Dynamic Trap (GDT) and develops a technique for creating a starting plasma with parameters sufficient for its subsequent heating by neutral beams. It is found that a relatively thin electron beam is capable of ionizing plasma in the entire volume of the trap, and the plasma turbulence it excites is capable of accelerating some of the electrons to energies tens of times higher than the initial energy of the beam. It is shown that, in contrast to early experiments on tabletop open traps, collective beam relaxation under GDT conditions occurs in the vicinity of the entrance magnetic mirror. Since the electron cyclotron frequency in this region significantly exceeds the plasma frequency, it is necessary to study the mechanism of a beam-plasma discharge under these conditions. As a first step along this path, we measure the radial diffusion coefficient of fast particles, as well as the rate at which they gain energy.

AB - The paper describes experiments on the injection of an electron beam into a gas at the Gas Dynamic Trap (GDT) and develops a technique for creating a starting plasma with parameters sufficient for its subsequent heating by neutral beams. It is found that a relatively thin electron beam is capable of ionizing plasma in the entire volume of the trap, and the plasma turbulence it excites is capable of accelerating some of the electrons to energies tens of times higher than the initial energy of the beam. It is shown that, in contrast to early experiments on tabletop open traps, collective beam relaxation under GDT conditions occurs in the vicinity of the entrance magnetic mirror. Since the electron cyclotron frequency in this region significantly exceeds the plasma frequency, it is necessary to study the mechanism of a beam-plasma discharge under these conditions. As a first step along this path, we measure the radial diffusion coefficient of fast particles, as well as the rate at which they gain energy.

KW - beam-plasma interaction

KW - mirror traps

KW - plasma start-up

UR - http://www.scopus.com/inward/record.url?scp=85129500251&partnerID=8YFLogxK

U2 - 10.1088/1741-4326/ac3be3

DO - 10.1088/1741-4326/ac3be3

M3 - Article

VL - 62

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 6

M1 - 066034

ER -