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• W42619957 abstract "The most significant recent advances that have been made within the Ignitor program are described. For physics, these involve the analysis of the confinement properties of plasmas produced in recent experiments with peaked density profiles relevant to Ignitor, the characterization of the regimes with double X-point configurations that Ignitor can generate, and the study of oscillatory states for the plasma pressure near ignition that can be obtained by both external and internal forms of control. On the engineering side, the second generation prototypes of the toroidal magnet plates that have been constructed are described. The completion of the design of the plasma chamber that withstands the estimated disruption forces, of the first wall system, including Mo tiles and associated supporting plates, and of the remote handling system is reported. Other relevant R&D activities (i.e. construction of a fast pellet injector) are being carried out. The design of all elements of the poloidal field system has been re-optimized. The analysis of the connection of Ignitor to a node of the European grid has been completed with positive results and official authorization. The set of currents in the machine coils, for a plasma current pulse of 11 MA, that minimizes the requirements of the machine electrical power supply system has been identified. 1. Ignition and Relevant Experimental Observations Ignition, the condition where the nuclear plasma heating equals the rate of plasma energy loss, can be attained at relatively low peak temperatures in a high magnetic field experiment, such as Ignitor [1] (R0=1.32 m, a×b _ ~ 0.47×0.86 m , BT ~ < 13 T, Ip ~ < 11 MA), designed to explore the physics of burning plasmas. In the reference operation scenario the plasma current reaches its maximum value in 4 s and the subsequent flattop lasts 4 s. A number of simulations carried out by the JETTO transport code [2,3] to study the attainment of ignition have pointed out that Ignitor can reach its goals by operating in regimes where no pressure pedestal is formed at the edge of the plasma column. The most accessible conditions to reach ignition involve relatively peaked density profiles (e.g., n0/ n ≅ 2) as they are beneficial for fusion burning plasmas from several perspectives, and in particular can provide a stability edge against the so-called ηi modes that enhance the ion thermal transport. In fact, the injection of pellets to prevent the confinement saturation was suggested originally for the Alcator C experiments to stabilize the Ion Temperature Gradient (ITG) driven modes by means of an adequate density gradient. Density profile peaking produced by multiple pellet injection have sustained enhanced confinement regimes in experiments carried out on the FTU machine [4]. As already observed in earlier experiments, the confinement time τE increases with density up to a saturation value, corresponding to the so-called L-mode regime," @default.
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• W42619957 date "2005-04-17" @default.
• W42619957 modified "2023-09-24" @default.
• W42619957 title "Advances in the Ignitor Program" @default.
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• W42619957 hasPublicationYear "2005" @default.
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