The heat flux pattern on HT-7 lower toroidal limiter

An expression for the heat flux on the lower toroidal limiter of HT-7 is derived according to the cosine law, taking into account of the ripple fields. The relationship between the heat flux pattern and the safety factor at LCFS is described. The self-shadow effect and perpendicular heat deposition are also taken into account. The perpendicular heat flux onto the limiter roof is analysed on the basis of the funnel effect, and a quantative result is obtained. In addition, the detailed 3D temperature distribution is simulated with COMSOL (FEMLAB).