Scaling Law of Non-Inductive Current Drive Steady State Tokamak

Steady-state fully non-inductive reverse shear scenarios with electron ITB and dominant bootstrap current

The relation between the safety factor profile, q, the electron transport and the bootstrap current is of crucial importance for predicting advanced scenarios in burning plasmas which will have dominant electron heating and small momentum input. In recent experiments in the Tokamak TCV, the full plasma current has been sustained with only off-axis co-current drive and bootstrap current. As soon...

Frequency scaling of the lower-hybrid-current-drive density limit in tokamak plasmas.

It is shown experimentally that the lower-hybrid current drive "density limit" is a function of the rf source frequency. While in previous 800MHz experiments this limit occurred at ie = 6 x 1012 cm-3. with a newly installed 2.45GHz, 100kW rf system on the Versator II tokamak fully rf-driven discharges have been achieved at densities up to i = 1.Ox 1013 cm3 , without increasing the toroidal magn...

Efficiency and Scaling of Current Drive and Refuelling by Spheromak Injextiqn into a Tokamak

The first measurements of current drive (refluxing) and refuelling by spheromak injection into a tokamak are discussed in detail. The current drive mechanism is attributed to the process of helicity injection, and refuelling is attributed to the rapid incorporation of the dense spheromak plasma into the tokamak. After an abrupt increase (up to go%), the tokamak current decays by a factor of thr...

Design Features of Tokamak Power Reactors with Rf-driven Steady State Current

Characteristics of Rf-driven Steady State Tokamak Power Reactors

The use of lower hybrid waves for current drive in steady state tokamak power reactors is studied. Constraints imposed by rf wave propagation are considered in detail. The effect of decoupling of electron and ion temperatures is studied and is found to enhance significantly the ratio of fusion power to dissipated power. Tradeoffs for parameters of rf driven steady state reactors are determined....