Design description of the coaxial helicity injection (CHI) system on NSTX-U

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.

[1]  George Marklin,et al.  Imposed-dynamo current drive , 2012 .

[2]  M. Ono,et al.  Experimental demonstration of tokamak inductive flux saving by transient coaxial helicity injection on national spherical torus experimenta) , 2011 .

[3]  L. L. Lao,et al.  Non-inductive current generation in NSTX using coaxial helicity injection , 2001 .

[4]  R Raman,et al.  Efficient generation of closed magnetic flux surfaces in a large spherical tokamak using coaxial helicity injection. , 2006, Physical review letters.

[5]  C. Neumeyer,et al.  Overview of the physics and engineering design of NSTX upgrade , 2011, IEEE/IPSS Symposium on Fusion Engineering.

[6]  R Raman,et al.  Demonstration of plasma startup by coaxial helicity injection. , 2003, Physical review letters.

[7]  Thomas R. Jarboe,et al.  Flux amplification in Helicity Injected Torus (HIT–II) coaxial helicity injection discharges , 2008 .

[8]  朴 三奎,et al.  Fusion Technology , 2004, The Future of Fusion Energy.

[9]  L. L. Lao,et al.  The ARIES-AT advanced tokamak, Advanced technology fusion power plant , 2006 .

[10]  Thomas R. Jarboe,et al.  Non-inductive solenoid-free plasma start-up using coaxial helicity injection , 2005 .

[11]  Thomas R. Jarboe,et al.  The impedance and energy efficiency of a coaxial magnetized plasma source used for spheromak formation and sustainment , 1990 .

[12]  Thomas R. Jarboe,et al.  Formation and steady-state sustainment of a tokamak by coaxial helicity injection , 1989 .

[13]  P. Cochat,et al.  Et al , 2008, Archives de pediatrie : organe officiel de la Societe francaise de pediatrie.