Construction and testing of the 2XIIB flat-topping power supply
Abstract
The construction details and test results of the 2XIIB flat topping modules are described. Both practical design and construction considerations as well as fabrication techniques are discussed. Power for the main compression coils of the 2XIIB is derived by discharging a high voltage capacitor bank and then crowbarring at the current peak to obtain L/R decay in the fields. To study plasma confinement under these quasi steady state conditions, it is necessary to hold the compression coil current constant for 10 ms. This is done by supplying only the I squared R losses of the system, using a low voltage bank. The low-voltage bank consists of 48 modules each supplying 20,000 A at plus or minus 450 V to each compression coil for a total of 480,000 A. The low voltage electrolytic bank is isolated from the high voltage bank by silicon diodes, which also act as crowbars at the end of the 10-ms flat topping or in the event that the electrolytic bank is not used.
- Publication:
-
Presented at the IEEE 6th Symp. on Eng. Probl. of Fusion Res
- Pub Date:
- November 1975
- Bibcode:
- 1975eprs.sympR....R
- Keywords:
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- Compression Loads;
- Electric Power Supplies;
- Fusion Reactors;
- Magnetic Coils;
- Diodes;
- Plasma Control;
- Silicon Transistors;
- Volt-Ampere Characteristics;
- Electronics and Electrical Engineering