Hydrogen pellet injection into Alcator C

Technical Report · Thu Sep 01 04:00:00 EDT 1983

OSTI ID:5843511

Greenwald, M

A four-shot pneumatic pellet injector, based on an ORNL design, has been built and operated on the Alcator C tokamak at MIT. The injector fires four independently-timed frozen hydrogen pellets with velocities in the range 8 x 10/sup 4/ - 1 x 10/sup 5/ cm/sec. Each contains 6 x 10/sup 19/ particles which corresponds to = 2 x 10/sup 14//cm/sup 3/. The objectives of this experiment are to study pellet fueling and penetration, particle confinement, dependence of energy confinement on density profile and fueling mode, and edge physics and recycling as a function of fueling mode. Typical pre-injection plasmas have had anti n/sub e/ = 2 - 3 x 10/sup 14/, Bt = 80 - 100 kG, Ip = 400 - 500 kA, T/sub e/(0) = 1200 - 1500 ev. A single pellet injected into this plasma will roughly double the electron density. Record plasma densities have been obtained by multiple injections. Line average densities in excess of 8 x 10/sup 14/ have been achieved, with highly peaked profiles. Central densities of 1.5 - 2 x 10/sup 15/ have been measured.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA). Plasma Fusion Center
• DOE Contract Number: AC02-78ET51013
• OSTI ID: 5843511
• Report Number(s): DOE/ET/51013-89; ON: DE83016878
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700205* -- Fusion Power Plant Technology-- Fuel
Heating
& Injection Systems
ALCATOR DEVICE
CLOSED PLASMA DEVICES
CONFINEMENT
CRYOGENICS
ELEMENTS
FUEL PELLETS
FUELS
HYDROGEN
INJECTION
INTAKE
NONMETALS
PELLETS
PLASMA CONFINEMENT
REACTOR FUELING
THERMONUCLEAR DEVICES
THERMONUCLEAR FUELS
TOKAMAK DEVICES