Experimental Study of High-Beta Tokamak Stability

An Experimental and Theoretical Study of the “Quasi-Coherent Fluctuations” in a High Density Tokamak Plasma

Magnetohydrodynamic stability analyses of tokamak edge plasmas

s of publications 1-5: 1. An ELMy ASDEX Upgrade plasma equilibrium is reconstructed taking into accountthe bootstrap current. The peeling mode stability of the equilibrium is numericallyanalysed using the GATO [1] code, and it is found that the bootstrap current candrive the plasma peeling mode unstable. A high-n ballooning mode stability analysisof the equilibria revealed that,...

Experimental Study of a High Speed Micro Waterwheel

Waterwheels are the oldest types of hydraulic machines. These turbines are of relatively simple design, large diameter, low rotational speed and high torques. But applying them as micro hydros of high speed and small diameter is yet to be explored. A micro hydro waterwheel of one meter diameter was designed and manufactured at the Iranian  esearc†h Organization for Science and Technology (IROST...

Stability Properties of High-Beta Geotail Flux Tubes

Kinetic theory is used to investigate the stability of ballooning-interchange modes in the high pressure geotail plasma. A variational form of the stability problem is used to compare new kinetic stability results with MHD, FastMHD, and Kruskal-Oberman stability results. Two types of drift modes are analyzed. A kinetic ion pressure gradient drift wave with a frequency given by the ion diamagnet...

Ideal Magnetohydrodynamic Stability Limits of a High Tokamak with Superimposed Helical Fields

The stability of a high 3 tokamak with a superimposed single helicity stellarator field is investigated in the context of the sharp boundary surface current model. The analysis treats external ideal magnetohydrodynamic modes including both pressure-driven ballooning effects and current-driven kink instabilities. The results show that the addition of an i = 2 field is unfavorable, lowering the a...