Description of cooling water calorimetry and wall thermometry diagnostic at tokamak ASDEX-Upgrade
Abstract
Hardware and software of the cooling water calorimetry and the wall thermometry diagnostics at the tokamak ASDEX-Upgrade are described. These diagnostics were used to analyze the energy deposition on the first wall elements in ASDEX-Upgrade. The cooling water calorimetry system consists of 130 platinum resistor thermometers Pt-100 and 27 annular flow meters located in the cooling water system of the tokamak downstream and upstream near the individual cooling units. In addition to the cooling water calorimetry system in some sections of the torus a wall thermometry diagnostic was installed to reach a higher poloidal resolution of the energy deposition measurements. The electrical measuring signals from the sensors were amplified, converted into digital signals, multiplexed with a frequency of 500 Hz, and sent over a fiber optics system into the control room. There a transputer system consisting of five T800 transputers receives the signals and stores a complete set of data about every three seconds during the 10 minute pause between the shots. These raw data were sent into the data analysis system of the experiment and the deposited energy for each cooling unit was calculated. First experimental results of the cooling water calorimetry show toroidal and poloidal asymmetries in the energy deposition in the ASDEX-Upgrade walls.
- Publication:
-
Unknown
- Pub Date:
- August 1992
- Bibcode:
- 1992dcwc.book.....R
- Keywords:
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- Heat Measurement;
- Liquid Cooling;
- Temperature Measurement;
- Tokamak Devices;
- Wall Temperature;
- Bolometers;
- Deposition;
- Fusion Reactors;
- Poloidal Flux;
- Recycling;
- Signal Processing;
- Thermal Radiation;
- Toroidal Plasmas;
- Plasma Physics