Kink fishbone branch
Web13 jun. 2024 · This ideal kink branch is a low fast ion and low frequency phenomenon. The other branch is the precessional fishbone, a high fast ion and high frequency instability. … WebThere are two branches of shbone mode. The high frequency branch is responsible for the shbone oscillations at the fast ion precessional frequency [9] (it can be referred to as the ‘precessional branch’), whereas the low frequency one manifests itself in oscillations with the bulk ion diamagnetic frequency (the ‘diamagnetic branch’) [10].
Kink fishbone branch
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Web15 jul. 2016 · Resistive fishbones with and without an ideal wall are investigated. It is found that, in the presence of energetic particles as well as plasma resistivity, two branches of … Web5 mei 2011 · (a) The internal kink and classical fishbone and (b) the RWM branch and EPdriven branch. See text for explanation of the paradigm. JT-60U (left) and DIII-D (right) configurations and q-profiles.
Web2 apr. 2009 · In high-b plasmas, typical of spherical tori, the usual kink/fishbone branch may be stabilized by the reversal of the direction of the toroidal particle precession drift, … Web[en] A special kind of internal kink mode, the fishbone, can be excited by the energetic particles in tokamak plasma. Theoretical analysis of fishbone modes based on the ideal MHD framework have predicted that two branches of modes exist. One is the Chen-White branch with ω ≅ ω dm >, corresponding to a higher threshold in β h, the other is the …
Web19 feb. 2016 · The fishbone instability in plasma, excited by energetic particles (EPs), was first observed in PDX discharges with neutral beam injection (NBI) . Other energetic … Webusual branch of the ideal internal kink,7 unstable for plasma 6 (the ratio of plasma pressure to magnetic pressure) greater than a threshold value, is stabilized by a trapped particle …
WebFishbone activity with frequencies around the precessional drift frequency of the fast ions Z~ ZDH [1] and the diamagnetic frequency of the bulk ions Z~ Z *i [2] have been observed in several tokamaks. In the first case, fishbone bursts occur when the precessional fishbone branch of the internal kink mode becomes unstable, while in the second case
Web5 mei 2011 · These comparative studies suggest that an energetic particle-driven “off-axis-fishbone-like mode” is a new EP-driven branch of the external kink mode in wall … top collection movies in hindi languageWebtheory predicts that there are two branches of fishbone instability excited by the hot trapped ions. One has the averaged precession fre-quency of hot ions ( o>dh) with higher thresh-old of hot ion beta, called Chen branch 2i. Another has ion diamagnetic drift frequency ( o>» i), called Coppi branch131. Chen branch pictionary refill cardsWeb24 jan. 2011 · The fishbone instability has a characteristic down-chirping frequency which is, later on, explained by many theoretical works that attribute the down-chirping frequency to radial transport of... pictionary regelsWebAside from the fishbone branch and the ion branch, the internal kink mode dispersion relation has the "normal MHD" solution, the kink branch. The kink branch becomes unstable when the ideal growth rate y, is sufficiently high, causing sawteeth to occur (yj is defined as y s = -«> 4dW MHD, where co A is the Alfven frequency and 5W MHD is the ... pictionary refillsWebAs a typical energetic particle mode, fishbone have two branches, one is high frequency oscillation which determined by resonant fast ion’s characteristic drift frequency, usually … pictionary reglerWeb5 mei 2011 · These comparative studies suggest that an energetic particle-driven “off-axis-fishbone-like mode” is a new EP-driven branch of the external kink mode in wall-stabilized plasmas, analogous to the relationship of the classical fishbone branch to the internal kink mode. ACKNOWLEDGMENTS top college admission consultantsWeb19 jul. 2016 · The destabilization of ideal internal kink modes by trapped fast particles in tokamak plasmas with a “shoulder”-like equilibrium current is investigated. It is found that energetic particle branch of the mode is unstable with the driving of fast-particle precession drifts and corresponds to a precessional fishbone. The mode with a low stability … top college backpacks that looks good wearing