Abstract
This paper presents design considerations for gas and pellet fuelling in ITER. Typical machine performance is 1.5 GW of fusion power for 1000 s of DT burn. The fuelling system consists of gas and pellet injection. The maximum DT fuelling rate is 500 Pa m 3/s during a plasma density rise and 200 Pa m 3/s during steady state DT burn. Impurity gas (e.g. Ne, Ar) will also be injected to control divertor radiation losses. The plasma exhaust is designed for a neutral pressure of 0.1–10 Pa at the inlet of the pumping duct. Total net pumping speed of the cryogenic primary pumps is about 300 m 3/s. Up to 90% of the regenerated fuel gases (H,D,T) from the primary cryopump will be returned directly to the plasma.
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