Reaction of turbulence at the edge and in the center of the plasma column to pulsed impurity injection caused by the sputtering of the wall coating in L-2M stellarator
Journal Article
·
· Plasma Physics Reports
- Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation)
Impurity injection into plasma caused by the sputtering of the wall coating in the L-2M stellarator during auxiliary electron cyclotron resonance heating leads to a change in the level of plasma density fluctuations with frequencies above 0.25 MHz: suppression of long-wavelength (k{sub ⊥} = 2 cm{sup –1}) density fluctuations in the edge plasma, intensification of short-wavelength (k{sub ⊥} = 30 cm{sup –1}) and long-wavelength (k{sub ⊥} = 1 cm{sup –1}) fluctuations at the midradius of the plasma column, and intensification of short-wavelength fluctuations (k{sub ⊥} = 20 cm{sup –1}) in the plasma center (including the gyroresonance region). At the same time, the level of fluctuations with frequencies below 0.25 MHz remains unchanged. In the edge plasma, a decrease in the plasma potential and suppression of its fluctuations is observed during impurity injection, which also causes an increase in MHD activity.
- OSTI ID:
- 22760291
- Journal Information:
- Plasma Physics Reports, Journal Name: Plasma Physics Reports Journal Issue: 8 Vol. 43; ISSN PPHREM; ISSN 1063-780X
- Country of Publication:
- United States
- Language:
- English
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