Systems studies of lower cost ITER options

The tokamak systems code (SuperCode) is used to identify lower-cost ITER op tions. Superconducting coil, lower-cost options are found by: (1) reducing the ITER technical objectives (e.g., driven burn and lower wall load), (2) using more aggressive physics (advanced physics) assumptions (e.g., higher shaping, better confinement, higher beta, etc.), and (3) more aggressive en gineering assumptions (reduced shield/gaps and inductive requirements). Und er ITER nominal physics assumptions, but designing for a driven Q = 10 oper ation results in similar to 30% cost reduction if the required neutron wall load is dropped to 0.5 MW/m(2). Assuming advanced physics guidelines leads to cost savings of up to 40% in an ignited device with a major radius as l ow as R = 5.5 m. Designing this device for Q = 10 results in additional cos t savings of 10%. If reduced inboard shield and scrapeoff is assumed, and n o inductive capability is required, machine size and cost benefits tend to saturate at about R = 5 m and 50% of the ITER-EDA cost.