Page 190 - Fundamentals of Magnetic Thermonuclear Reactor Design

Superconducting Magnet Systems Chapter | 5 171

FIGURE A.5.14 Quasi-3D model of one of six CS modules.

While an average heat power release by the ITER magnets over a burn cycle
is ∼40 kW, peak values may be much higher. Therefore, pulsed heat loads com-
ing to the cryoplant should be smoothed to ensure cryoplant stability without
sacrificing the magnets’ performance. Various mitigation strategies for the ITER
application have been examined for almost 20 years. A significant contribution
to these studies has been made by the author. Methods to mitigate heat loads
transferred to the cryoplant have been analysed at the ACB level. The basic
concept is a dynamic control of the parameters of SHe circulating through the
heat exchangers. Heat load mitigation is accompanied by the helium tempera-
ture and mass flow rate variations at the magnet inlet. For this reason, the ITER
magnet operability has always been analysed with allowance made for selected
smoothing strategy [18–24].
The authors have proposed and numerically studied several mitigation
schemes, including different regulators and relevant control algorithms. A prop-