Development of a Helicon Plasma Source for the Measurement of He* Component in a He0 Beam

Abstract

A high density plasma source using helicon discharge was designed for the measurement of the population ratio of the metastable state and ground state in a helium neutral beam. The required density of the plasma source was investigated in terms of the rate coefficient relevant to the beam-plasma interaction. The charge-exchange for the metastable state is a dominant process in a beam-energy range of 30-300 keV for the beam attenuation, promising the measurement of the metastable fraction in the helium neutral beam using this plasma source. The first plasma with the electron density of 3.4 × 10 12 cm −3 and the electron temperature of 10 eV was successfully produced in argon gas.

<b>Divertor Plasma Simulation Experiment Using Hydrogen Ionizing </b><b>Plasma and Helium Ion Beam in an RF Plasma Source </b><b>DT-ALPHA</b>

“…Experiments were conducted using the RF plasma device DT-ALPHA [8]. The schematic of the device is shown in Fig.…”

Helium Volumetric Recombining Plasma Formation for Energetic Ion Injection in Radio-Frequency Plasma Device DT-ALPHA

“…Experiments were performed using the radiofrequency (RF) plasma device DT-ALPHA [9]. Figure 1 shows a schematic of the DT-ALPHA device, which consists of a quartz tube and a stainless steel (SUS) vacuum chamber.…”

Charge-Exchanged Beam Measurement by Using a Grid-Biased Faraday Cup

“…Experiments have been performed using the DT-ALPHA device [3]. A Faraday cup equipped with three biasing grids is installed in the center of an end plate, as shown in Fig.…”

“…Studying those phenomena by using a small device with an energy-controlled beam [1] has experimental advantages such as flexibility and accessibility. Thus, methods for measurement of a small current-neutral beam (I beam ∼ 1 nA-1 μA) are required.…”