SPARC Integrated Design and Operational Scenarios

The SPARC tokamak is a critical next step toward commercial fusion energy. Having progressed through several design iterations, SPARC has now baselined major parameters at Version 2 (V2) and is proceeding with detailed engineering design. With $B_0 = 12.2$ T, $R_0 = 1.85$ m, $a = 0.57$ m, and a goal of $Q>2$, SPARC is a compact, high-field, D-T tokamak that will directly access conditions expected in a fusion power plant [A. J. Creely et al., \emph{J. Plasma Phys.} Submitted]. Empirical projections of plasma performance indicate that there is considerable margin over the $Q>2$ goal, predicting up to $Q \approx 11$ with $H_{98,y2}=1$. In addition to this primary reference discharge, several other plasma scenarios have been scoped out for SPARC, including L-mode operation, lower field and current scenarios, and an X-point target advanced divertor scenario. The engineering design has now incorporated detailed analysis of many key systems, including the toroidal and poloidal field coils, the central solenoid, the vacuum vessel, neutron shielding, and others, leading to the current machine design.