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New double stage pellet injector was designed for deep plasma fuelling. A distinguishing feature of the injector is a cryogenic piston inside a pump tube. Such a piston should be used as an element of the shot for maintaining propellant gas pressure behind a pellet. Large xenon piston have been formed and accelerated in the pump tube. The helium pressure in the pump tube by acting of xenon piston increased from 0.05-0.25 MPa up to 100 MPa. This approach let us avoid piston wearing in double stage pellet injectors operating in repetitive mode. |
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Pump tube diameter |
4 mm |
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Pump tube length |
1500 mm |
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Propellant gas pressure |
100 bar |
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Piston material |
Xe (solid) |
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Second stage gun diameter |
1.5 mm |
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Second stage gun length |
300 mm |
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Pellet velocity |
2.5 km/s |
