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According to its proponents, ohmic heating leads the quasi-impurity-free 50% deuterium-50% tritium Ignitor plasma to ignition in an unsteady scenario including a fast ramp-up of the plasma current. However, an Ion Cyclotron Resonant Heating (ICRH) system has also been added to accelerate the achievement of ignition as well as to access the H- and the I-regimes.
In Ignitor the available heating power would be provided by a 18-24 MW of ion cyclotron heating plus the ohmic power
[1]. In order to reach the envisaged peak density shortly after the end of the current ramp, when ignition is expected to occur, a high speed injector (producing pellets with velocities » 4 Km/s) has been included in the machine design. Besides ensuring fast core fuelling and density profile control, the injector also provides time dependent burn control [1], [4].
In the Ignitor experiment, the ICRH waves are planned to be used as a tool to control the plasma temperature, in particular to accelerate the achievement of ignition in the extended first wall configuration, and to facilitate the H-mode transition in the double X-point configuration
The ICRH system has been conceived with a modular configuration (two modules, each serving two antennas) to optimize the coupling of the RF (radio-frequency) power to the plasma in different regimes. The RF module, in turn, is based on 4 high power generators and is able to operate in the frequency range 80-120 MHz generating a total power up to 8 MW at the central frequency of 80 MHz.
Furthermore, once the full complement of RF heating is provided, then significant amount of fusion power could be produced in D- 3He reactions, thus beginning the exploration of tritium-poor burn experiments

1) B. Coppi et al, Nucl. Fusion 41, 1253 (2001)
2) F. Bombarda et al, Braz. J. Phys. 34, 1786 (2004)
3) B. Coppi et al, Overview Paper OV/P-02, Proceedings of the 24 th IAEA Fusion Energy Conference, San Diego, US, 8-13/10/2012
4) B. Coppi et al, Overview Paper OV/P-02, Proceedings of the 23 rd IAEA Fusion Energy Conference, Daejeon, Republic of Korea, 11-16/10/2010

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