Plasma density injection and flow during coaxial helicity injection in a tokamak
Abstract
Whole device, resistive MHD simulations of spheromaks and tokamaks have used a large diffusion coefficient that maintains a nearly constant density throughout the device. In the present work, helicity and plasma are coinjected into a low-density plasma in a tokamak with a small diffusion coefficient. As in previous simulations [Hooper et al., Phys. Plasmas 20, 092510 (2013)], a flux bubble is formed, which expands to fill the tokamak volume. The injected plasma is non-uniform inside the bubble. The flow pattern is analyzed; when the simulation is not axisymmetric, an n = 1 mode on the surface of the bubble generates leakage of plasma into the low-density volume. Closed flux is generated following injection, as in experiments and previous simulations. The result provides a more detailed physics analysis of the injection, including density non-uniformities in the plasma that may affect its use as a startup plasma [Raman et al., Phys. Rev. Lett. 97, 175002 (2006)].
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1421288
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Name: Physics of Plasmas Journal Volume: 25 Journal Issue: 2; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Hooper, E. B. Plasma density injection and flow during coaxial helicity injection in a tokamak. United States: N. p., 2018.
Web. doi:10.1063/1.5018196.
Hooper, E. B. Plasma density injection and flow during coaxial helicity injection in a tokamak. United States. https://doi.org/10.1063/1.5018196
Hooper, E. B. Wed .
"Plasma density injection and flow during coaxial helicity injection in a tokamak". United States. https://doi.org/10.1063/1.5018196.
@article{osti_1421288,
title = {Plasma density injection and flow during coaxial helicity injection in a tokamak},
author = {Hooper, E. B.},
abstractNote = {Whole device, resistive MHD simulations of spheromaks and tokamaks have used a large diffusion coefficient that maintains a nearly constant density throughout the device. In the present work, helicity and plasma are coinjected into a low-density plasma in a tokamak with a small diffusion coefficient. As in previous simulations [Hooper et al., Phys. Plasmas 20, 092510 (2013)], a flux bubble is formed, which expands to fill the tokamak volume. The injected plasma is non-uniform inside the bubble. The flow pattern is analyzed; when the simulation is not axisymmetric, an n = 1 mode on the surface of the bubble generates leakage of plasma into the low-density volume. Closed flux is generated following injection, as in experiments and previous simulations. The result provides a more detailed physics analysis of the injection, including density non-uniformities in the plasma that may affect its use as a startup plasma [Raman et al., Phys. Rev. Lett. 97, 175002 (2006)].},
doi = {10.1063/1.5018196},
journal = {Physics of Plasmas},
number = 2,
volume = 25,
place = {United States},
year = {Wed Feb 14 00:00:00 EST 2018},
month = {Wed Feb 14 00:00:00 EST 2018}
}
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