Abstract
The ITER Electron Cyclotron Emission (ECE) diagnostic is progressing towards its Preliminary Design Review (PDR). In parallel, the diagnostic integration in the Equatorial Port is ongoing. Port Integration has to address the structural integrity to withstand various loads, maintenance and the safety aspects of ECE diagnostic. The ITER ECE system includes radial and oblique lines-of-sight. Recently, a successful peer-review of the in-port plug Hot Calibration Source has taken place and its performance and integration feasibility has been demonstrated. Four 45-meter long low-loss transmission lines are designed to transmit mm-wave power in the frequency range of 70- 1000 GHz in both X- and O-mode polarization from the port plug to the ECE instrumentation room in the diagnostic building. Prototype transmission lines are being tested [1]. A prototype polarizing Martin-Puplett type Fourier Transform Spectrometer (FTS) operating in the frequency range 70-1000 GHz, has a fast scanning mechanism and a cryo-cooled dual-channel THz detector system. Its performance has been tested as per ITER requirements. Assessment of the instrumentation and control requirements, functional and non-functional requirements, operation procedures, plant automation are ongoing for the PDR. The current status of the diagnostic, together with integration activities, is presented.
Highlights
The ITER Electron Cyclotron Emission (ECE) diagnostic is progressing towards its Preliminary Design Review (PDR)
The Electron Cyclotron Emission (ECE) diagnostic design in ITER has to address the specifications defined in the project measurement requirements
Results are important for the engineering solution for transmission line layout: currently, ITER ECE foresees using fully evacuated smooth-wall transmission lines with safety valves at building boundaries to ensure confinement function, to minimize mm-wave absorption on water vapour in air, and to avoid Bragg-scattering effects that would be present if corrugated waveguides are used
Summary
ECE integration into the ITER complex is a very important task that requires interfaces with other systems, like port plug, buildings and remote handling. The latter is important as the port plugs will have to be remotely handled during installation/removal, including refurbishment, environmental and functional tests in the Hot Cell Facility (HCF) outside the tokamak. Another very important design driver for the diagnostic is occupational safety for workers who will have to perform hands-on maintenance operations. This paper updates the status of ITER ECE design and discusses current and future activities
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