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Title: Experimental and modeling uncertainties in the validation of lower hybrid current drive

Abstract

Our work discusses sources of uncertainty in the validation of lower hybrid wave current drive simulations against experiments, by evolving self-consistently the magnetic equilibrium and the heating and current drive profiles, calculated with a combined toroidal ray tracing code and 3D Fokker–Planck solver. The simulations indicate a complex interplay of elements, where uncertainties in the input plasma parameters, in the models and in the transport solver combine and compensate each other, at times. It is concluded that ray-tracing calculations should include a realistic representation of the density and temperature in the region between the confined plasma and the wall, which is especially important in regimes where the LH waves are weakly damped and undergo multiple reflections from the plasma boundary. Uncertainties introduced in the processing of diagnostic data as well as uncertainties introduced by model approximations are assessed. We show that, by comparing the evolution of the plasma parameters in self-consistent simulations with available data, inconsistencies can be identified and limitations in the models or in the experimental data assessed.

Authors:
 [1];  [2];  [2];  [2];  [2];  [2];  [1];  [1];  [1];  [1];  [3];  [3];  [4];  [2];  [2];  [2];  [2]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  3. CompX, Del Mar, CA (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1338617
Alternate Identifier(s):
OSTI ID: 1275970
Grant/Contract Number:  
AC02-CH0911466; FC02-99ER54512
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 58; Journal Issue: 9; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; lower hybrid waves; tokamak; validation; hard x-rays; integrated modeling

Citation Formats

Poli, F. M., Bonoli, P. T., Chilenski, M., Mumgaard, R., Shiraiwa, S., Wallace, G. M., Andre, R., Delgado-Aparicio, L., Scott, S., Wilson, J. R., Harvey, R. W., Petrov, Yu V., Reinke, M., Faust, I., Granetz, R., Hughes, J., and Rice, J.. Experimental and modeling uncertainties in the validation of lower hybrid current drive. United States: N. p., 2016. Web. doi:10.1088/0741-3335/58/9/095001.
Poli, F. M., Bonoli, P. T., Chilenski, M., Mumgaard, R., Shiraiwa, S., Wallace, G. M., Andre, R., Delgado-Aparicio, L., Scott, S., Wilson, J. R., Harvey, R. W., Petrov, Yu V., Reinke, M., Faust, I., Granetz, R., Hughes, J., & Rice, J.. Experimental and modeling uncertainties in the validation of lower hybrid current drive. United States. doi:10.1088/0741-3335/58/9/095001.
Poli, F. M., Bonoli, P. T., Chilenski, M., Mumgaard, R., Shiraiwa, S., Wallace, G. M., Andre, R., Delgado-Aparicio, L., Scott, S., Wilson, J. R., Harvey, R. W., Petrov, Yu V., Reinke, M., Faust, I., Granetz, R., Hughes, J., and Rice, J.. Thu . "Experimental and modeling uncertainties in the validation of lower hybrid current drive". United States. doi:10.1088/0741-3335/58/9/095001. https://www.osti.gov/servlets/purl/1338617.
@article{osti_1338617,
title = {Experimental and modeling uncertainties in the validation of lower hybrid current drive},
author = {Poli, F. M. and Bonoli, P. T. and Chilenski, M. and Mumgaard, R. and Shiraiwa, S. and Wallace, G. M. and Andre, R. and Delgado-Aparicio, L. and Scott, S. and Wilson, J. R. and Harvey, R. W. and Petrov, Yu V. and Reinke, M. and Faust, I. and Granetz, R. and Hughes, J. and Rice, J.},
abstractNote = {Our work discusses sources of uncertainty in the validation of lower hybrid wave current drive simulations against experiments, by evolving self-consistently the magnetic equilibrium and the heating and current drive profiles, calculated with a combined toroidal ray tracing code and 3D Fokker–Planck solver. The simulations indicate a complex interplay of elements, where uncertainties in the input plasma parameters, in the models and in the transport solver combine and compensate each other, at times. It is concluded that ray-tracing calculations should include a realistic representation of the density and temperature in the region between the confined plasma and the wall, which is especially important in regimes where the LH waves are weakly damped and undergo multiple reflections from the plasma boundary. Uncertainties introduced in the processing of diagnostic data as well as uncertainties introduced by model approximations are assessed. We show that, by comparing the evolution of the plasma parameters in self-consistent simulations with available data, inconsistencies can be identified and limitations in the models or in the experimental data assessed.},
doi = {10.1088/0741-3335/58/9/095001},
journal = {Plasma Physics and Controlled Fusion},
number = 9,
volume = 58,
place = {United States},
year = {Thu Jul 28 00:00:00 EDT 2016},
month = {Thu Jul 28 00:00:00 EDT 2016}
}

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