FAST FREEZING SINGLE BARREL HYDROGEN PELLET INJECTOR (POROUS SLEEVE)

EXPORTED TO: Japan, NIFS National Institute for Plasma Physics, Toki

 

Porous type single barrel pellet injector is a pneumatic gas gun for injection frozen hydrogen or deuterium pellets into plasma. The pellet formation time is reduced from 3-5 minutes in a routine pipe-gun injector to a few seconds due to a new technique using a porous sleeve. A pre-frozen solid fuel is melted inside the porous unit by means of a heat pulse of a propellant gas moving through an injector barrel and after that the liquid is re-frozen in the barrel. This technique provides a continuous steady-state pellet formation and injection of an unlimited amount of pellets.

Cryogenic system is based on a helium flowing cryostat. 

 

Propellant gas

He

Gas pressure

4 MPa

Pellet material

hydrogen, deuterium

Pellet size

Ø 3 mm×5 mm (L)

Pellet velocity

1.4 km/s

Repetition rate

0.05 ÷ 0.1 Hz