Density rise experiment on PLT
Abstract
The evolution of the density profile in PLT during intense gas puffing is documented and analyzed. Measurements of the spectrum of low energy edge neutrals and of the change in central neutral density indicate that charge-exchange processes alone cannot account for the central density rise. The transient density profile changes can be reproduced numerically by a diffusivity of approx. 10/sup 4/ cm/sup 2//s, and a spatially averaged inward flow of 10/sup 3/ cm/s. These transport coefficients are 10 ..-->.. 10/sup 2/ times larger than neoclassical. The ion energy confinement is reduced, the small scale density fluctuations are increased, and runaway electrons losses are increased during the density rise.
- Authors:
- Publication Date:
- Research Org.:
- Princeton Univ., NJ (USA). Plasma Physics Lab.
- OSTI Identifier:
- 5153611
- Report Number(s):
- PPPL-1894
ON: DE82015484; TRN: 82-014591
- DOE Contract Number:
- AC02-76CH03073
- Resource Type:
- Technical Report
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; PLT DEVICES; PLASMA DENSITY; REACTOR FUELING; CHARGE EXCHANGE; GAS INJECTION; PLASMA DRIFT; RUNAWAY ELECTRONS; ELECTRONS; ELEMENTARY PARTICLES; FERMIONS; FLUID INJECTION; LEPTONS; THERMONUCLEAR REACTORS; TOKAMAK TYPE REACTORS; 700205* - Fusion Power Plant Technology- Fuel, Heating, & Injection Systems
Citation Formats
Strachan, J.D., Bretz, N., and Mazzucato, E. Density rise experiment on PLT. United States: N. p., 1982.
Web. doi:10.2172/5153611.
Strachan, J.D., Bretz, N., & Mazzucato, E. Density rise experiment on PLT. United States. doi:10.2172/5153611.
Strachan, J.D., Bretz, N., and Mazzucato, E. Sat .
"Density rise experiment on PLT". United States.
doi:10.2172/5153611. https://www.osti.gov/servlets/purl/5153611.
@article{osti_5153611,
title = {Density rise experiment on PLT},
author = {Strachan, J.D. and Bretz, N. and Mazzucato, E.},
abstractNote = {The evolution of the density profile in PLT during intense gas puffing is documented and analyzed. Measurements of the spectrum of low energy edge neutrals and of the change in central neutral density indicate that charge-exchange processes alone cannot account for the central density rise. The transient density profile changes can be reproduced numerically by a diffusivity of approx. 10/sup 4/ cm/sup 2//s, and a spatially averaged inward flow of 10/sup 3/ cm/s. These transport coefficients are 10 ..-->.. 10/sup 2/ times larger than neoclassical. The ion energy confinement is reduced, the small scale density fluctuations are increased, and runaway electrons losses are increased during the density rise.},
doi = {10.2172/5153611},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat May 01 00:00:00 EDT 1982},
month = {Sat May 01 00:00:00 EDT 1982}
}
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