Power systems analysis and design for ADX

The Advanced Divertor eXperiment (ADX) [1] is a compact, high field (6.5 T with possible upgrade to 8 T), high power density tokamak being proposed to test new advanced divertor concepts at reactor-level conditions. Development and testing of advanced Lower Hybrid Current Drive (LHCD) and Ion Cyclotron Range of Frequency (ICRF) concepts including high-field-side launch capability is also an important goal for ADX [2], [3]. Where possible the design of the ADX experiment will make extensive use of existing power systems at MIT that presently support Alcator C-Mod, which includes a 225 MVA alternator/flywheel (2 GJ stored energy) and 32 MVA (peak) substation. Analysis of existing alternator/flywheel, substation, and power system supply capabilities and their application to support ADX operation up to 6.5 T will be discussed. Power system supplies, magnet voltages and currents and operating requirements based on the current point design will be presented. Potential power system upgrades that would support ADX operation at 8 T and 2 MA plasma current will also be described.