We have developed the pulsed plasma operation scenarios for JA DEMO, a design concept of the steady-state tokamak demonstration reactor, to clarify controls of the current profile and power required for the operation. We compare the scenarios when injecting electron cyclotron waves only and both neutral beam and electron cyclotron waves for external heating and current drive. We demonstrate current profile control that maintains the minimum value of the safety factor above one and avoids creating the local minima in the safety factor profile and power control by argon seeding that maintains the fusion power constant at the desired value and reduces the heat load on the divertor, performing long-time integrated modeling simulations. We clarify the conditions of the heating and current drive system and impurity injection system required for such control. The dependence of power control on argon anomalous transport coefficients is investigated. We have the prospect of maintaining the fusion power of 1 GW for more than two hours, i.e. obtaining the required plasma performance determined using a systems code.
This paper explores pulsed plasma operation scenarios for the JA DEMO tokamak reactor, focusing on controlling the current profile and maintaining fusion power. The authors demonstrate techniques to avoid safety factor issues and manage heat loads on the divertor, using electron cyclotron waves, neutral beams, and argon seeding. Their simulations show the potential to sustain 1 GW of fusion power for over 2 hours.