Fig. 3.12 Schematic of NUWMAK Fusion Power Plant The power flow for one NUWMAK reactor is shown in Fig. 3.12. The gross thermal efficiency is 34.5%. After accounting for auxiliary power requirements of 65 MW, of which 60 MW is needed to cool the magnets, the net power output is 660 MW with a net thermal efficiency of 31.5%. Two reactors would have a net output of 1320 MW. The NUWMAK reactors differ from those of previous studies (such as UWMAK) in that no diverter is used. Impurity control (which is needed in order to keep the plasma from cooling) is accomplished instead by gas puffing, which, along with partial pellet fueling, permits operation for approximately 225 seconds with adequate plasma cleanliness. During a burn, neutral deuterium gas is puffed into the plasma approximately every 0.5 seconds. Tritium is introduced in solid pellets, which penetrate only the outer plasma mantle. A sharp temperature profile develops at the plasma edge, which is kept cold both by the gas puffing and by introduction of impurities. However, the step temperature profile prevents impurities from diffusing towards the plasma center. The impurities are neutralized and pumped out through vacuum-pump ports. The plasma requires a magnetic field of 6.05 T (tesla) at a major radius of 5.13 m, which means a maximum field of 12 T at the magnet. To provide the needed access for maintenance and repair, NUWMAK is designed with only eight large superconducting ”D”-shaped TF coils and the increased ripple is corrected with 16 saddle-shaped trimming coils. The primary design of the
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