The development of an untuned cavity as a high effective temperature microwave calibration source
Abstract
The development and characterization of an untuned cavity as a microwave source of high effective radiometric temperature are described. This source is intended for use in the calibration of the Fabry-Perot spectrometers forming part of the Electron Cyclotron Emission (ECE) diagnostic system on the Joint European Torus (JET). Radiation input to the cavity is provided by backward wave oscillators operating between 100 and 170 GHz at a typical bandwidth of 0.5 GHz. The cavity is shown to give an isotropic output which simulates that from a black body source observed with a bandwidth smaller than the resolution of the spectrometer.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- August 1990
- Bibcode:
- 1990STIN...9120462W
- Keywords:
-
- Calibrating;
- Cavities;
- Extremely High Frequencies;
- Fabry-Perot Spectrometers;
- High Temperature;
- Joint European Torus;
- Microwaves;
- Backward Waves;
- Bandwidth;
- Black Body Radiation;
- Brightness Temperature;
- Cyclotron Radiation;
- Electron Cyclotron Heating;
- Isotropy;
- Microwave Oscillators;
- Instrumentation and Photography