Finite Pressure Effects on Reversed Shear Alfven Eigenmodes

Technical Report · Fri Sep 03 04:00:00 EDT 2004

DOI:https://doi.org/10.2172/835894· OSTI ID:835894

Kramer, G J ^[1]; Gorelenkov, N N; Nazikian, R; Cheng, C Z

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1. Princeton Plasma Physics Laboratory

The inclusion of finite pressure in ideal-magnetohydrodynamic (MHD) theory can explain the Reversed magnetic Shear Alfven Eigenmodes (RSAE) (or Alfven cascades) that have been observed in several large tokamaks without the need to invoke the energetic particle mechanism for the existence of these modes. The chirping of the RSAEs is cased by changes in the minimum of the magnetic safety factor, q(sub)min, while finite pressure effects explains the observed non-zero minimum frequency of the RSAE when qmin has a rational value. Finite pressure effects also play a dominant role in the existence of the downward chirping RSAE branch.

• Research Organization: Princeton Plasma Physics Lab., Princeton, NJ (US)
• Sponsoring Organization: USDOE Office of Science (SC) (US)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 835894
• Report Number(s): PPPL-4002
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
MAGNETOHYDRODYNAMICS (MHD)
MHD INSTABILITY
PRESSURE DEPENDENCE
REVERSED SHEAR
SAFETY
SHEAR