Plasma Initiation and Startup in DIII-D Simulating the ITER Scenario

DIII-D similarity experiments have investigated the ITER baseline startup scenario, specifically outer wall low field side (LFS) limited discharges with an I$_{p }$ ramp at constant safety factor, q$_{95}$. Optimizing startup may be necessary for ITER advanced tokamak (AT) discharges and to minimize limiter heating. Although I$_{p}$ initiation in DIII-D occurred near the inner wall (in the region of highest E$_{\phi }$L, where E$_{\phi }$ is the inductive electric field and L is the wall connection length), it moved outward in $<$5 ms (scaling to $\sim $0.25 s in ITER) and then limited on the LFS limiters. In this ITER-like shape, I$_{p }$was ramped to $\le $1.2 MA with q$_{95}$ held constant during the limited phase by a simultaneous I$_{p}$ and $\kappa $ ramp. In addition to presenting LFS startup results, we will discuss other startup issues for ITER, i.e. limiter heat flux, compatibility with AT scenarios, sawteeth, and vertical stability. Startup scenarios other than constant q$_{95}$ will also be presented.