Validating neutral-beam current drive simulations in the TJ-II stellarator

Doppler reflectometer system in the stellarator TJ-II.

A Doppler reflectometer system has recently been installed in the stellarator TJ-II. The system is optimized for the Q-band (33-50 GHz) and the high-curvature plasmas produced in TJ-II. The launch angle of the microwave beam can be controlled by a steerable mirror to obtain angles between +/-20 degrees enabling the measurement of perpendicular wave numbers in the range of 3-15 cm(-1). The avail...

Improvement of the Drive Current in 5nm Bulk-FinFET Using Process and Device Simulations

Abstract: We present the optimization of the manufacturing process of the 5nm bulk-FinFET technology by using the 3D process and device simulations. In this paper, bysimulating the manufacturing processes, we focus on optimizing the manufacturingprocess to improve the drive current of the 5nm FinFET. The improvement of drivecurrent is one of the most important issues in ...

Probing the edge ion temperature by passive Doppler spectroscopy in the TJ-II stellarator

We report on the measurement of the edge ion temperature in TJ-II plasmas, heated by electron cyclotron waves and neutral beam injection, using passive spectroscopy of impurity ions in low ionization stages. The measurements, which provide both temporal and some spatial resolution, offer some advantages over more intrusive or more sophisticated methods. The capabilities and limitations of this ...

Ion Heating in transitions to CERC in the Stellarator TJ-II

F. Castejón1,4, L.A. Fernández2,4,V. Martin-Mayor2,4, A. Tarancón3,4, J.L. Velasco3,4, CX group1 1 Laboratorio Nacional de Fusión—Asociación Euratom/Ciemat, 28040-Madrid, Spain 2 Dep. de Física Teórica I. Universidad Complutense de Madrid, 28040-Madrid, Spain. 3 Dep. de Física Teórica. Universidad de Zaragoza, 50009-Zaragoza, Spain 4 BIFI: Instituto de Biocomputación y Física de Sistemas Comple...

3D effects on transport and plasma control in the TJ-II stellarator