Title :
Design description of the coaxial helicity injection (CHI) system on NSTX-U
Author :
Raman, Raghu ; Jarboe, T.R. ; Nelson, B.A. ; Mueller, Daniel ; Jardin, S.C. ; Neumeyer, C. ; Ono, M. ; Menard, J.E.
Author_Institution :
Univ. of Washington, Seattle, WA, USA
Abstract :
Elimination of the central solenoid would simplify the engineering design of a Fusion Nuclear Science Facility (FNSF) and tokamak based devices. The method of Transient Coaxial Helicity Injection (CHI) has successfully demonstrated formation of a high-quality closed flux plasma in NSTX and will be used as the front end of the start-up method for a full demonstration of non-inductive current start-up, followed by non-inductive current ramp-up using neutral beams in the NSTX-U device that is now under construction at the Princeton Plasma Physics Laboratory (PPPL). CHI is implemented by driving current along open field lines that connect the lower inner and outer divertor plates of a Spherical Torus (ST). The engineering system requirements and the design of the CHI system on NSTX-U are described.
Keywords :
Tokamak devices; fusion reactor design; fusion reactor divertors; plasma beam injection heating; plasma toroidal confinement; solenoids; CHI system design description; FNSF; NSTX-U device; PPPL; Princeton plasma physics laboratory; ST; central solenoid elimination; coaxial helicity injection system design description; engineering design; engineering system requirements; front end start-up method; full noninductive current start-up demonstration; fusion nuclear science facility; high-quality closed flux plasma; lower inner divertor plate; lower outer divertor plate; neutral beams; noninductive current ramp-up; open field lines; spherical torus; tokamak based devices; transient CHI method; transient coaxial helicity injection method; Capacitors; Coils; Discharges (electric); Fault location; Plasmas; Transient analysis; CHI; Helicity injection; NSTX; NSTX-U; Plasma start-up; Spherical Torus; non-inductive; solenoid-free;
Conference_Titel :
Fusion Engineering (SOFE), 2013 IEEE 25th Symposium on
Conference_Location :
San Francisco, CA
Print_ISBN :
978-1-4799-0169-2
DOI :
10.1109/SOFE.2013.6635378
