DIONISOS (Dynamics of ION Implantation and Sputtering Of Surfaces) is a steady-state linear plasma device located at the PSFC. It is designed to perform ion beam analysis (IBA) or controlled radiation damage during plasma exposure in order to study plasma-wall interactions for magnetic nuclear fusion relevant applications. The ion beam, consisting of either light or heavy species, is generated using a 1.7MV tandem ion accelerator.
The device parameters are:
DIONISOS consists of a sample transfer arm that can transfer samples from a load lock chamber (that can wet samples with Li in-vacuo) to an exposure chamber that is connected to a 1.7MV tandem accelerator, and a plasma source. The sample holder can be actively biased and heated, providing control over the incident ion energy (up to 350eV) and enabling sample temperatures of up to 1200℃. A base pressure of ~10-7 Torr is achieved in the exposure chamber.
The plasma is generated inside a quartz tube by a water-cooled 13.56 MHz, 3 kW helicon Nagoya type III RF antenna. The source is enclosed in a faraday cage to protect surrounding equipment from RF interference. An air-cooling system ensures the source does not overheat during operation.
The PMI experiments are performed inside the exposure chamber. The plasma is confined to a cylindrical shape 50 mm in diameter by an axial magnetic field (<0.1T) generated by a set of four copper coils. The ion beam and plasma hit the sample at a 450 angle.
Diagnostics:
