Full wave simulations of fast wave efficiency and power losses in the scrape-off layer of tokamak plasmas in mid/high harmonic and minority heating regimes

Bertelli, N.; Jaeger, E. F.; Hosea, J. C.; Phillips, C. K.; Berry, L.; Bonoli, P. T.; Gerhardt, S. P.; Green, D.; LeBlanc, B.; Perkins, R. J.; Qin, C. M.; Pinsker, R. I.; Prater, R.; Ryan, P. M.; Taylor, G.; Valeo, E. J.; Wilson, J. R.; Wright, J. C.; Zhang, X. J.

doi:10.7910/DVN/VBDX3H

Title: Full wave simulations of fast wave efficiency and power losses in the scrape-off layer of tokamak plasmas in mid/high harmonic and minority heating regimes

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Abstract

Several experiments on different machines and in different fast wave (FW) heating regimes, such as hydrogen minority heating and high harmonic fast waves, have found strong interaction between radio-frequency (RF) waves and the scrape-off layer (SOL) region. This paper examines the propagation and the power loss in the SOL by using the full wave code AORSA, in which the edge plasma beyond the last closed flux surface (LCFS) is included in the solution domain and a collisional damping parameter is used as a proxy to represent the real, and most likely nonlinear, damping processes. 3D AORSA results for National Spherical Torus eXperiment (NSTX), where a full antenna spectrum is reconstructed, are shown confirming the same behavior found for a single toroidal mode results in Bertelli et al Nucl. Fusion, 54 083004, 2014, namely, a strong transition to higher SOL power losses (driven by the RF field) has been found when the FW cut-off is removed from in front of the antenna by increasing the edge density. Additionally, full wave simulations have been extended for “conventional” tokamaks with higher aspect ratios, such as the DIII-D, Alcator C-Mod, and EAST devices. DIII-D results show similar behavior found in NSTX and NSTX-U, consistentmore »« less

Publication Date:: Wed Jan 09 23:00:00 EST 2019

DOE Contract Number:: FC02-01ER54648

Research Org.:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center

Sponsoring Org.:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

OSTI Identifier:: 1880992

DOI:: https://doi.org/10.7910/DVN/VBDX3H

Citation Formats


                    Bertelli, N., Jaeger, E. F., Hosea, J. C., Phillips, C. K., Berry, L., Bonoli, P. T., Gerhardt, S. P., Green, D., LeBlanc, B., Perkins, R. J., Qin, C. M., Pinsker, R. I., Prater, R., Ryan, P. M., Taylor, G., Valeo, E. J., Wilson, J. R., Wright, J. C., and Zhang, X. J. Full wave simulations of fast wave efficiency and power losses in the scrape-off layer of tokamak plasmas in mid/high harmonic and minority heating regimes.  United States: N. p., 2019. 
        Web.  doi:10.7910/DVN/VBDX3H.

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                    Bertelli, N., Jaeger, E. F., Hosea, J. C., Phillips, C. K., Berry, L., Bonoli, P. T., Gerhardt, S. P., Green, D., LeBlanc, B., Perkins, R. J., Qin, C. M., Pinsker, R. I., Prater, R., Ryan, P. M., Taylor, G., Valeo, E. J., Wilson, J. R., Wright, J. C., & Zhang, X. J. Full wave simulations of fast wave efficiency and power losses in the scrape-off layer of tokamak plasmas in mid/high harmonic and minority heating regimes.  United States.  doi:https://doi.org/10.7910/DVN/VBDX3H

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                    Bertelli, N., Jaeger, E. F., Hosea, J. C., Phillips, C. K., Berry, L., Bonoli, P. T., Gerhardt, S. P., Green, D., LeBlanc, B., Perkins, R. J., Qin, C. M., Pinsker, R. I., Prater, R., Ryan, P. M., Taylor, G., Valeo, E. J., Wilson, J. R., Wright, J. C., and Zhang, X. J. 2019.  
"Full wave simulations of fast wave efficiency and power losses in the scrape-off layer of tokamak plasmas in mid/high harmonic and minority heating regimes".  United States.  doi:https://doi.org/10.7910/DVN/VBDX3H.  https://www.osti.gov/servlets/purl/1880992. Pub date:Wed Jan 09 23:00:00 EST 2019

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@article{osti_1880992,

  title        = {Full wave simulations of fast wave efficiency and power losses in the scrape-off layer of tokamak plasmas in mid/high harmonic and minority heating regimes},

  author       = {Bertelli, N. and Jaeger, E. F. and Hosea, J. C. and Phillips, C. K. and Berry, L. and Bonoli, P. T. and Gerhardt, S. P. and Green, D. and LeBlanc, B. and Perkins, R. J. and Qin, C. M. and Pinsker, R. I. and Prater, R. and Ryan, P. M. and Taylor, G. and Valeo, E. J. and Wilson, J. R. and Wright, J. C. and Zhang, X. J.},

  abstractNote = {Several experiments on different machines and in different fast wave (FW) heating regimes, such as hydrogen minority heating and high harmonic fast waves, have found strong interaction between radio-frequency (RF) waves and the scrape-off layer (SOL) region. This paper examines the propagation and the power loss in the SOL by using the full wave code AORSA, in which the edge plasma beyond the last closed flux surface (LCFS) is included in the solution domain and a collisional damping parameter is used as a proxy to represent the real, and most likely nonlinear, damping processes. 3D AORSA results for National Spherical Torus eXperiment (NSTX), where a full antenna spectrum is reconstructed, are shown confirming the same behavior found for a single toroidal mode results in Bertelli et al Nucl. Fusion, 54 083004, 2014, namely, a strong transition to higher SOL power losses (driven by the RF field) has been found when the FW cut-off is removed from in front of the antenna by increasing the edge density. Additionally, full wave simulations have been extended for “conventional” tokamaks with higher aspect ratios, such as the DIII-D, Alcator C-Mod, and EAST devices. DIII-D results show similar behavior found in NSTX and NSTX-U, consistent with previous DIII-D experimental observations. In contrast, a different behavior has been found for C-Mod and EAST, which operate in the minority heating regime unlike NSTX/NSTX-U and DIII-D, which operate in the mid/high harmonic regime.},

  doi          = {10.7910/DVN/VBDX3H},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Wed Jan 09 23:00:00 EST 2019},

  month        = {Wed Jan 09 23:00:00 EST 2019}

}

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DOI: https://doi.org/10.7910/DVN/VBDX3H

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Full wave simulations of fast wave efficiency and power losses in the scrape-off layer of tokamak plasmas in mid/high harmonic and minority heating regimes

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