Design of a repeating pneumatic pellet injector for the Joint European Torus

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5925593

Milora, S L; Combs, S K; Baylor, L R; Sparks, D O; Foust, C R; Gethers, F E

A three-barrel pneumatic pellet injector has been developed for plasma fueling of the Joint European Torus (JET). The versatile device consists of three independent machine-gun-like mechanisms that operate at cryogenic temperatures (14/sup 0/K to 20/sup 0/K). Individual high speed extruders provide a continuous supply of solid deuterium to each gun assembly, where a reciprocating breech-side cutting mechanism forms and chambers cylindrical pellets from the extrusion; deuterium pellets are then accelerated in the gun barrels with controlled amounts of compressed hydrogen gas (pressures up to 100 bars) to velocities less than or equal to 1.5 km/s. The injector features three nominal pellet sizes (2.7 mm, 4.0 mm, and 6.0 mm) and has been tested at repetition rates of 5 Hz, 2.5 Hz, and 1 Hz, respectively. Each gun is capable of operating (individually or simultaneously) at the design repetition rate for 15-second duration pulses (limited only by the capacity of the extruder feed system). A remote, stand-alone control and data acquisition system is used for injector operation. 7 refs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5925593
• Report Number(s): CONF-871007-16; ON: DE88001414
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700205* -- Fusion Power Plant Technology-- Fuel
Heating
& Injection Systems
CAMAC SYSTEM
COMPUTERS
CONTROL EQUIPMENT
CONTROL SYSTEMS
CRYOGENIC STORAGE DEVICES
DATA ACQUISITION SYSTEMS
DEC COMPUTERS
DESIGN
DEUTERIUM
ELECTRONIC CIRCUITS
EQUIPMENT
FLOW REGULATORS
HYDROGEN ISOTOPES
ISOTOPES
JET TOKAMAK
LIGHT NUCLEI
MEMORY DEVICES
MICROELECTRONIC CIRCUITS
MICROPROCESSORS
NUCLEI
ODD-ODD NUCLEI
PELLET INJECTION
PNEUMATIC CONTROLLERS
STABLE ISOTOPES
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
VALVES