On an Electric Pulsed Hydride Injector for gas puffing into tokamaks

The potential application of an Electric Pulsed Hydride Injector as a fuelling device for tokamaks was examined. The developed injector, which does not make use of moving parts, is equipped with 20 molybdenum elements coated with titanium for the interim storage of deuterium/tritium in a chemically bound way. Gas generation is accomplished by electrically heating these elements. The pressure of the generated gas flow is comparable to the gas pressure in tokamaks. To feed tokamaks of ITER-FEAT size with deuterium/tritium the individual elements must be replaced by packages of 16 elements. 20 packages constitute a module with a volume of about 3×10−3 m3. The module can deliver a deuterium flow of 3.7×10−6 kg/s during 100 s or 2×10−6 kg/s during 400 s. The electrical power consumption is estimated to be approx. 2 kW. To maintain the plasma density in a tokamak constant a combination of a single element with packages of elements is proposed.