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Description
ELVA-1 radiometers for plasma diagnostic are worldwide known product. The custom designed ECE radiometers have been installed at lots of Tokamaks:
– JET Tokamak, UK
– TCV Tokamak, Switzerland
– TCABR Tokamak, Brazil
– FTU Tokamak, Italy
– CASTOR Tokamak, Czech Republic
– Southwestern Institute of Physics, China
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Receiver module of Radiometer
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Inside view of E-band front-end of Radiometer for Castor Tokamak
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Specifications
| ParameterTokamak | JET/KK3 | JET/KK3 | TCV | TCABR | FTU |
| Type | Front-End | Front-End | Multi-channel | Sweeping | Multi-channel |
| Operating frequency, GHz | 69-139 | 139-206 | 78-114 | 52-85 | 113-153 |
| Channel Number | 6 | 6 | 24 | 1 | 32 |
| Noise factor, dB (typ) | 9-12 | 12-15 | 15-20 | 15 | 15-22 |
| Output frequency | 6-18 GHz | 6-18 GHz | 40 kHz | 1 MHz | 1 MHz |
| Putting into operation | 2001 | 2008 | 2000 | 2002 | 2000 |
Operation Manuals
1. 130-170 GHz Front-End for D-band ECE Radiometer. 130-170 GHz Front-End for D-band ECE Radiometer is another yet example of custom-designed equipment developed by ELVA-1. The front-end consist of two broadband downconverters, the first one for 130-150 GHz and the second one 150-170 GHz. Both of the downconverters have IF frequency band 1-20 GHz. General design features of the front end included high operating frequency combined with high sensitivity. Each of the downconverters designed as an integrated module combined local oscillator with balanced mixer, filters and isolator (for high frequency channel only).
2. 113-153 GHz 32-channel Radiometer for Plasma Electron Temperature Measurements. The multichannel 113-153 GHz Radiometer was designed for plasma electron temperature measurements in FTU tokamak (Frascati, Italy). The fact is taken as a basis of the device that the intensity of the ECE 2nd harmonic is proportional to the electron plasma temperature in situations when the plasma can be considered as the black body for its own cyclotron radiation. The Radiometer is a superheterodyne receiver that picks up the plasma EC emission and produces 0-+10V analogue output signal proportional to the plasma emission power. The measurements are performed simultaneously in 32 frequency channels (i.e. radial points in the plasma) covering 113-153 GHz band that corresponds to magnetic field range from 2 to 2.7 T. Output signals are delivered in a form available to be stored in tokamak data acquisition system.
3. 120-180 GHz Sweeping Heterodyne Radiometer. An original version of the Millimeter-wave Sweeping Radiometer (MSR) was developed in 1995 by request of Tokamak Division of Southwestern Institute of Physics, Chengdu, China. On agreement with the purchaser, the device, which by the present was far beyond its lifetime, has been recently restored and modernized. Just after completing the modernization, the renovated version had been tested in situ by applying to electron temperature measurements in HT1-M tokamak experimental campaign of September 2000.
4. 52-85 GHz Heterodyne Sweeping ECE Radiometer for plasma temperature measurements on TCABR Tokamak (Brazil). This project took a half year for completion, from developing stage to ready-to-ship unit. The principal distinctive features of 52-85GHz Radiometer are highly sensitive receiver and wideband BWO sweep generator, plus low cost of the equipment. Read special page on launching the Radiometer at customer site
5. 26.5-40 and 76.5-90 GHz the Multichannel Radiometer has been designed for plasma electron temperature measurements in TOKAMAK COMPASS The Radiometer is a super heterodyne receiver with double frequency conversion. The fact is taken as a basis of the device that the intensity of the ECE 2–nd harmonic is proportional to the electron plasma temperature in situations when the plasma can be considered as the black body for its own cyclotron radiation. The Radiometer picks up the plasma electromagnetic emission and produces 0…+10V analogue output signal proportional to the plasma emission power. The measurements are performed simultaneously in 16 frequency channels covering 26.5-40 GHz or 76.5-90 GHz band.
6. 1-20 GHz 16-channel IF Receiver. The multichannel 1.0-20.0 GHz Receiver (below referred to as Receiver) is intended to be used with wideband down converters. The system down converter with receiver (Radiometer) can be used for plasma electron temperature measurements in tokamaks. The fact is taken as a basis of the device that the intensity of the ECE 2nd harmonic is proportional to the electron plasma temperature in situations when the plasma can be considered as the black body for its own cyclotron radiation. The Radiometer is a super heterodyne receiver that picks up the plasma EC emission and produces 0…+10 V analogue output signal proportional to the plasma emission power. The measurements are performed simultaneously in 16 frequency channels (i.e. radial points in the plasma) covering f heterodyne +20 GHz band. Output signals are delivered in a form available to be stored in tokamak data acquisition system.