Particle flux characteristics of a compact high-field cascaded arc plasma device

Abstract

A new compact cascaded arc device for plasma-wall interaction study is developed at the Institute of Plasma Physics, Chinese Academy of Sciences. A magnetic field up to 0.8 T is achieved to confine plasmas in a 1.2 m long and 0.1 m diameter vacuum chamber. Gas fluid type analysis in this compact vacuum system was done under high particle flux condition. The gas pressure obtained by calculation was consistent with the measurement result. Continuous argon plasma discharge with ion flux of ∼0.5×10 24 m −2 s −1 is successfully sustained for more than 1 h. The effects of magnetic field configuration, gas flow rate, and discharge arc current on the ion flux to target were studied in detail.

Characterization of cascaded arc He plasma in a compact linear plasma device using voltammetry and optical emission spectroscopy

“…In figure 2, the origin z = 0 is taken at the nozzle of anode. More details about the device can be found elsewhere [12,13]. As a non-invasive and simple plasma diagnostic method, optical emission spectroscopy (OES) has been extensively applied in the linear plasma device.…”

“…In China, within the Comprehensive Research Facility for Fusion Technology (CRAFT) project, a large superconducting linear plasma testing facility based on CAPS will be built to address some key R&D issues of plasma-facing materials and components for China Fusion Engineering Test Reactor (CFETR) and the facility is expected produce the reactor-relevant plasma (ion flux > 10 24 m −2 s −1 ) with duration of more than 1000 s [12]. To test and optimize the plasma source, a compact LPD, as a forerunner of the CRAFT LPD, has been established [12,13]. The device is characterized by a compact designment which enables to enhance the magnetic field at the moderate current, realizing the long-pulse operation.…”

“…The device is characterized by a compact designment which enables to enhance the magnetic field at the moderate current, realizing the long-pulse operation. The Ar gas was initially utilized as the working gas and how the Ar plasma operates in the compact arrangement is revealed in the previous work [13]. Ar, however, is not the tokamak's primary working gas.…”