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Abstract
The Electron Cyclotron Emission (ECE) diagnostic system in ITER provides essential information for plasma control and for evaluating the plasma performance. It measures the electron temperature profile (edge/core), electron temperature fluctuations and radiated power in the electron cyclotron frequency range from the plasma. Virginia Diodes Inc. (VDI) has designed and developed a state-of-the-art prototype receiver to detect emission in the 200-300 GHz frequency range. The prototype receiver developed by VDI has been tested at DIII-D tokamak to check its performance by measuring higher frequency ECE harmonics in high temperature plasmas. Bench testing verifies the receiver’s band coverage and noise temperatures. Good sensitivity has been obtained meeting the ITER requirement. Also, the receiver performance is assessed for ITER by comparing the data from the receiver and the existing Michelson interferometer for the same DIII-D plasma shot. The measurement results show that the receiver provides accurate temperature information for the plasma emission throughout the frequency band.
Highlights
For ITER high toroidal field operation (Bt0 ~5.3 T), the first and second harmonic Electron Cyclotron Emission (ECE) extends from 122-230 GHz, and 220-340 GHz respectively
Virginia Diodes Inc. (VDI) has designed and developed prototype receiver based on advanced solid state technology [3]
The prototype receiver developed by VDI for frequency range 200-300 GHz was installed at DIII-D to check its performance by carrying out some bench-top measurements, and measurement of ECE radiation temperature of the DIII-D plasma to test and verify other important parameters [4]
Summary
For ITER high toroidal field operation (Bt0 ~5.3 T), the first and second harmonic ECE extends from 122-230 GHz, and 220-340 GHz respectively. The prototype receiver from VDI (Rx149), is a compact solid state millimeter wave receiver system which employs a waveguide-based triplexer, a Dielectric Resonator Oscillator (DRO) based local oscillator, an integrated tripler, subharmonic mixer and amplifier. This integrated assembly leads to improved performance and reliability. The frequency range corresponding to the low, mid and high bands is 200-233.33 GHz, 233.33-266.66 GHz, and 266.66-300 GHz respectively
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