29th Symposium on Fusion Technology (SOFT 2016)

P4.014 Progress in Development of Pellet Injector Technology in India

8 Sep 2016, 14:20

1h 40m

Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Board: 14

Poster A. Experimental Fusion Devices and Supporting Facilities P4 Poster session

Speaker

Jyoti Shankar Mishra (Institute for plasma research)

Description

Institute for Plasma Research (IPR), India has a programme of development of allied technologies with applications related to fusion reactor. A pneumatic gas gun kind Single pellet injector system (SPINS-IN) developed at IPR is successfully delivering hydrogen pellets of size 2 mm with a velocity of 700 meters/sec.  It is a cryocooler based system operated at a temperature < 10 K and delivering a pellet every five minutes equipped with a fast opening valve for pellet acceleration and necessary diagnostic to measure the ejected pellet parameter. Its differential pumping system comprises three vacuum chambers to remove the propellant helium from injection line. Gas content of 2mm to 3mm pellet is of the order of 7 to 23.3 mbar-liter. For a plasma temperature in the range of 1 to 3 KeV and density < 5x10¹⁹ 19 cm^-3-3, a study was carried out using NGS model for penetration depth of pellet in plasma. Injector is now installed on SST-1 tokomak for pellet injection related experiments. For continuous supply of pellets development of Extruder Type Pellet Injector System (ETPIS) is in progress. It is a twin screw based cryogenic extruder with a precooler and liquefier. Cool down will be carried out using cryocooler and the system will extrude hydrogen ribbon. This paper describes the progress of pellet injector technology development at IPR-India.