"NSTX Upgrade for establishing physics and technology basis for FNSF," by Masayuki Ono (PPPL)

Friday, November 14, 2014 - 12:30pm to 1:30pm
Plasma Seminars

Plasma Seminar

Physics and Astronomy Building (PAB) Room 4-330
Friday, November 14, 2014
Refreshments at 12

Guest Speaker: Masayuki Ono (Princeton Plasma Physics Laboratory)

Talk Title: "NSTX Upgrade for establishing physics and technology basis for FNSF"


The National Spherical Torus Experiment - Upgrade (NSTX-U) is the most powerful spherical torus facility being constructed at PPPL. The major mission of NSTX-U is to develop the physics and technology basis for an ST-based Fusion Nuclear Science Facility (FNSF). The ST-based FNSF has the promise of achieving the high neutron fluence needed for reactor component testing with relatively modest tritium consumption. At the same time, the unique operating regimes of NSTX-U can contribute to several important issues in the physics of burning plasmas to optimize the performance of ITER. The new center stack will provide BT = 1 Tesla (T) at a major radius of R0 = 0.93 m compared to 0.55 T at R0 = 0.85 m in NSTX, and will enable a plasma current Ip of up to 2 mega-Amp (MA) for 5 sec compared to the 1 MA for 1 sec in NSTX. With BetaT ~ 25% at BT = 1T, the absolute average plasma pressure in NSTX-U could become comparable to that of present-day tokamaks. With addition of a much more tangential 2nd NBI system, NSTX-U is designed to attain the 100% non-inductive operation needed for a compact FNSF design.  With higher fields and heating powers, the NSTX-U plasma collisionality will be reduced by a factor of 3-6 to help explore the favorable trend in transport observed in NSTX towards the low collisionality FNSF regime. The NSTX-U facility construction is nearly complete and the first plasma is planned for February 2015, at which time the transition to plasma operation will occur. 

PAB 4-330