Anomalous impurity ion heating from Alfvénic cascade in the reversed field pinch
نویسندگان
چکیده
Anomalous ion and impurity heating in reversed field pinch plasmas is addressed. Previous work #N. Mattor et al., Comments Plasma Phys. Controlled Fusion 15, 65 !1992"$, which calculated the heating of bulk ions by gyro and Landau resonances with turbulent fluctuations cascading from unstable tearing modes, is extended to impurity species measured in Madison symmetric torus !MST". The heavier mass of impurities allows gyro-resonant heating at lower frequencies where more energy is present in the fluctuations. A 0D transport model is used to examine heating rates under various time-dependent, experimental heating scenarios, such as a sawtooth crash. Impurity heating rates calculated for impurities found in MST are comparable to observed rates inferred in the impurity temperature rise during sawtooth events. © 2008 American Institute of Physics. #DOI: 10.1063/1.2998829$
منابع مشابه
Role of Impurity Cyclotron Damping in Ion Heating and RFP Turbulence
In the reversed field pinch ions are heated anomalously relative to collisional energy exchange with Ohmically heated electrons. The process channels electron energy to ions in a way that is still not understood. Recent observations suggest that impurities are preferentially heated. A theory for ion heating via impurity ioncyclotron-resonant damping of the turbulent energy cascaded from unstabl...
متن کاملSpatially resolved measurements of ion heating during impulsive reconnection in the Madison Symmetric Torus.
The impurity ion temperature evolution has been measured during three types of impulsive reconnection events in the Madison Symmetric Torus reversed field pinch. During an edge reconnection event, the drop in stored magnetic energy is small and ion heating is observed to be limited to the outer half of the plasma. Conversely, during a global reconnection event the drop in stored magnetic energy...
متن کاملImpurity transport studies in the Madison Symmetric Torus reversed-field pinch during standard and pulsed poloidal current drive regimes
The transport of intrinsic impurities is investigated during standard and improved confinement regimes of the Madison Symmetric Torus (MST) reversed-field pinch. The impurity diffusion coefficient (D) and pinch velocity (v) are obtained through comparing the time evolution of experimental impurity density profiles with the results of a one-dimensional impurity transport code. Experimental hollo...
متن کاملIon heating during reconnection in the Madison Symmetric Torus reversed field pinch
Measurements of localized ion heating during magnetic reconnection in the Madison Symmetric Torus reversed field pinch R. N. Dexter, D. W. Kerst, T. W. Lovell, S. C. Prager, and J. C. Sprott, Fusion Technol. 19, 131 1991 are presented using two beam-based diagnostics: Charge exchange recombination spectroscopy and Rutherford scattering. Data have been collected from three types of impulsive rec...
متن کاملClassical impurity ion confinement in a toroidal magnetized fusion plasma.
High-resolution measurements of impurity ion dynamics provide first-time evidence of classical ion confinement in a toroidal, magnetically confined plasma. The density profile evolution of fully stripped carbon is measured in MST reversed-field pinch plasmas with reduced magnetic turbulence to assess Coulomb-collisional transport without the neoclassical enhancement from particle drift effects....
متن کامل