Impurity pellet injection experiments at TFTR. Final performance report

Technical Report · Tue Dec 01 04:00:00 EST 1992

DOI:https://doi.org/10.2172/10103315· OSTI ID:10103315

Marmar, E S

Impurity (Li and C) pellet injection experiments on TFTR have produced a number of new and significant results. (1) We observe reproducible improvements of TFTR supershots after wall-conditioning by Li pellet injection (`lithiumization`). (2) We have made accurate measurements of the pitch angle profiles of the internal magnetic field using two novel techniques. The first measures the internal field pitch from the polarization angles of Li{sup +} line emission from the pellet ablation cloud, while the second measures the pitch angle profiles by observing the tilt of the cigar-shaped Li{sup +} emission region of the ablation cloud. (3) Extensive measurements of impurity pellet penetration into plasmas with central temperatures ranging from {approximately}0.3 to {approximately}7 keV have been made and compared with available theoretical models. Other aspects of pellet cloud physics have been investigated. (4) Using pellets as a well defined perturbation has allowed study of transport phenomena. In the case of small pellet perturbations, the characteristics of the background plasmas are probed, while with large pellets, pellet induced effects are clearly observed. These main results are discussed in more detail in this paper.

• Research Organization: Massachusetts Inst. of Tech., Cambridge, MA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-90ER54084
• OSTI ID: 10103315
• Report Number(s): DOE/ER/54084--T1; ON: DE93005008
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700330
700460
FUELS
HEATING AND FUELING SYSTEMS
LITHIUM
MAGNETIC FIELDS
PELLET INJECTION
PLASMA IMPURITIES
PLASMA KINETICS, TRANSPORT, AND IMPURITIES
PROGRESS REPORT
TFTR TOKAMAK