Speaker
Description
The study of transmission modes of electron cyclotron heating (ECH) transmission lines are very important for the long pulse operation as the gyrotron is located far away from the plasma device [1]. This mode is studied by using phase retrieval method based on intensity pattern. The pattern was measured by taking temperature profile on a paper screen which is placed at different locations and the profile were captured using infrared camera. This retrieval method has been used by several researchers like Yasuhisa Oda for ITER [2], Guoyao Fan for Hl-3 tokamak [3] which uses two set of locations for retrieving the phase and amplitude at the end of waveguide and further calculating the mode content. In the similar way, we have developed our phase retrieval code using three different locations and further calculating the modes. Apart from LP01, LP11(even) LP11(odd), LP02, the other higher order mode content has also been calculated. The below figure shows retrieved amplitude and phase at the output mouth. The others result along with mode content calculations will be discussed in details in the talk.
