Rotation of a strongly magnetized hydrogen plasma column determined from an asymmetric Balmer-beta spectral line with two radiating distributions

A potential buildup in front of a magnetized cascaded arc hydrogen plasma source is explored via .vector.E * .vector.B rotation and plate potential measurements. Plasma rotation approaches thermal speeds with max. velocities of 10 km/s. The diagnostic for plasma rotation is optical emission spectroscopy on the Balmer-beta line. Asym. spectra are obsd. A detailed consideration is given on the interpretation of such spectra with a two distribution model. This consideration includes radial dependence of emission detd. by Abel inversion of the lateral intensity profile. Spectrum anal. is performed considering Doppler shift, Doppler broadening, Stark broadening, and Stark splitting. [on SciFinder (R)

Extreme hydrogen plasma fluxes at Pilot-PSI enter the ITER divertor regime

\u3cp\u3ePilot-PSI produces hydrogen plasma with a cascaded arc. It is demonstrated that the output electron density reaches 4 × 10\u3csup\u3e21\u3c/sup\u3e m\u3csup\u3e-3\u3c/sup\u3e by pushing the input power to 45 kW. Increasing the diameter of the discharge channel (studied from 4 to 7 mm) does not affect the plasma output but reduces the power input by up to 25%. The plasma was post-heated by feeding the plasma column with a net current. This increased the electron temperature from ∼2 to 4 eV. Calorimetric and voltage measurements on the cascade plates showed that this also influenced the discharge characteristics inside the arc.\u3c/p\u3