Conceptual Design of the ITER ECE Diagnostic – An Update

¹ Institute for Fusion Studies, University of Texas, Austin, TX, USA
² ITER-India/Institute for Plasma Research, Bhat 382428, Gandhinagar, India
³ Center for Electromechanics, University of Texas, Austin, TX, USA
⁴ Inst. for Res. in Elec. and Applied Physics, University of Maryland, College Park, MD, USA
⁵ Princeton Plasma Physics Laboratory, Princeton, NJ, USA
⁶ Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, USA

Abstract

The ITER ECE diagnostic has recently been through a conceptual design review for the entire system including front end optics, transmission line, and back-end instruments. The basic design of two viewing lines, each with a single ellipsoidal mirror focussing into the plasma near the midplane of the typical operating scenarios is agreed upon. The location and design of the hot calibration source and the design of the shutter that directs its radiation to the transmission line are issues that need further investigation. In light of recent measurements and discussion, the design of the broadband transmission line is being revisited and new options contemplated. For the instruments, current systems for millimeter wave radiometers and broad-band spectrometers will be adequate for ITER, but the option for employing new state-of-the-art techniques will be left open.