Page 2 - Study of Neutral Gas Pressure Dynamics in C-2W Using Inverted Magnetron Ionization Gauges

Length of linear systems makes it difficult to image the plasma throughout
The C-2W1 (Norman) plasma consists of an FRC embedded in a magnetic mirror scrape-off-layer (SOL).
• The 24 m long device consists of many vacuum vessels including:
• a confinement chamber for the sustained FRC,
• expander divertors with a relatively low density
plasma connecting to biased electrodes,
• quartz tubes for theta-pinch formation.
• Long axial direction compared to short symmetric azimuthal direction requires many imaging instruments to view the plasma throughout.
Inner divertors:
high vacuum pumping
Neutral beams: ~21 MW, ~30 ms
Formation sections:
~15 mWb trapped flux
Outer divertors:
high vacuum pumping
Plasma guns and biasing electrodes: high voltage & long pulse capability
Confinement vessel:
skin time <3 ms
Magnet system:
field ramp & active control
• This is a common challenge for all linear systems!
1Gota, H.; et. al. Nuclear Fusion, 2019, 59, 112009 Presenter: Erik Granstedt 2