Multi-second neutral beam injector (60kV, 6A) for plasma diagnostics in the upgraded T-15 device

Abstract

Properties of sub-THz waves generated by the plasma during interaction with relativistic electron beam

Overview of neutral beam injectors for plasma heating and diagnostics developed at Budker INP

“…A spherical shape of the multiaperture grids provides ballistic focusing of the beam resulting in small dimensions of the focal spot of the diagnostic neutral beam in a plasma. In recent decades the BINP team has developed diagnostic injectors for various plasma devices, for example: the Wendelstein 7-X stellarator at IPP, Greifswald, Germany (Davydenko et al 2016); the C-2W facility at TAE, USA; the T-15MD tokamak at the Kurchatov Institute, Moscow, Russia (Stupishin et al 2016); the ST40 tokamak at Tokamak Energy Ltd, Abingdon, UK. The main parameters of these injectors are listed in table 1.…”

“…The beam density modulation depth reaches ≈60 %. The diagnostic injector developed for the T-15MD tokamak forms a hydrogen beam with an energy of 60 keV and an equivalent current of 2.6 A (Stupishin et al 2016). Integrated beam-on time is maximally set to 1 s when the beam is operated in a 10 s pulse with modulation.…”

“…The diagnostic injector for the ST40 tokamak is the upgraded injector made earlier for the TEXTOR tokamak (Listopad et al 2012). Its plasma source has been replaced by an arc discharge plasma generator with a cold cathode (Stupishin et al 2016), which is more reliable and much easier to operate (although the pulse duration becomes shorter). All power systems were redesigned to work from storages based on supercapacitors due to the absence of a powerful electric network.…”

The development of charge exchange recombination spectroscopy diagnostics for the T-15MD tokamak

“…The CXRS-diagnostics for T-15MD uses the DNB DINA-KI60 developed in Budker Institute of Nuclear Physics, Novosibirsk [5]. It is based on an arc discharge ion source (up to 500 A).…”

“…Taking into account the diagnostic beam density distribution along its radius, experimentally obtained by the DINA-KI60 manufacturer (see figure 4 in [5]), a two-dimensional field of the 2020 JINST 15 C02027 intensity of the mentioned carbon ion active radiation is calculated. Figure 4 illustrates the light intensity distribution of C 5+ CX-line passive (inner and outer peripheral regions) and active (from the DNB, injection from the top of the figure) components as well as the geometry of LOS for equatorial plane.…”