Development of high performance passively cooled mirrors for ECH launchers

Abstract

Abstract-Fusion reactors and state-of-the-art tokamaks will operate at pulse lengths that require heat absorbing components to be designed for steady state operation. Electron Cyclotron Heating (ECH) power sources are approaching that goal as well.The reflecting mirrors for ECH launchers will therefore need to be designed for steady-state operation.There are still a number of ECH systems that do not operate at steady state, but at increasing pulse lengths and power levels. At these facilities, despite some advantages that would result from using actively cooled ECH launcher mirrors, operating costs and risks can be minimized by using passively cooled mirrors that are designed to be replaced with a minimum of difficulty. I.

Development of steady-state mirrors for the KSTAR ECH launchers

“…Its mirrors enabled the use of a 1 figure 2], with mirrors and steering D P200x launchers, and adapted to geometry. A second launcher of th with the new 170GHz system 8 , wa launcher was upgraded in 2013 w mirrors 9 . These mirrors are passively cool during long intervals between The large temperature excursions design result in significant thermal mirrors are thus "finite life."…”