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Title: Collisionality driven turbulent particle transport changes in DIII-D H-mode plasmas

Abstract

The results of the experimental dimensionless scan in this paper confirm that there is an increase in density peaking towards lower collisionality and that this can be partly linked to a shift in the turbulence regime from ITG towards TEM. However at the lowest collisionality, the changes in turbulence and transport are much more pronounced than expected from direct collisionality effect on the turbulence. In this paper, the collisionality, ν * is varied by a factor 5, while keeping ρ *, q, β, M, fixed. Additionally, a 3 Hz gas puff modulation is applied to modulate the electron density profile and extract the perturbed transport coefficients using two diagnostics. The transport analysis shows that the increase in density peaking at low ν * is linked to an increase in the inward particle pinch and not an increase in core fueling. These observations are not only in agreement with prior modeling scans of how turbulence changes as a function of collisionality and its impact upon the particle fluxes, but also with the multi-machine database (Fable E. et al 2010 Plasma Phys. Control. Fusion 52 015007) (Angioni C. et al 2003 Phys. Rev. Lett. 90 205003). The changes in turbulence across themore » collisionality scan were captured at large scale by the BES and at smaller scale by the DBS. A comparison with gradient-driven GENE simulations showed similar trends at both scales. Moreover, the changes observed in overall transport are in agreement with gradient-driven TGLF particle flux simulations. This indicates that TGLF/GENE when given the gradients as input, are able to reproduce the experimentally observed turbulence changes.« less

Authors:
 [1];  [2];  [2];  [3];  [3]; ORCiD logo [4];  [5];  [1]; ORCiD logo [6];  [6];  [6]
  1. College of William and Mary, Williamsburg, VA (United States)
  2. Univ. of California, Los Angeles, CA (United States)
  3. VTT Technical Research Centre of Finland, Espoo (Finland)
  4. General Atomics, San Diego, CA (United States)
  5. Univ. of Wisconsin, Madison, WI (United States)
  6. Chalmers Univ. of Technology, Gothenburg (Sweden)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); College of William and Mary, Williamsburg, VA (United States); Univ. of Texas, Austin, TX (United States); Univ. of California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1618050
Alternate Identifier(s):
OSTI ID: 1618153
Grant/Contract Number:  
FC02-04ER54698; SC0007880; FG03-97ER54415; SC0019302; FG02-08ER54984
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 60; Journal Issue: 6; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Mordijck, S., Rhodes, T. L., Zeng, L., Salmi, A., Tala, T., Petty, C. C., McKee, G. R., Reksoatmodjo, R., Eriksson, F., Fransson, E., and Nordman, H. Collisionality driven turbulent particle transport changes in DIII-D H-mode plasmas. United States: N. p., 2020. Web. doi:10.1088/1741-4326/ab81aa.
Mordijck, S., Rhodes, T. L., Zeng, L., Salmi, A., Tala, T., Petty, C. C., McKee, G. R., Reksoatmodjo, R., Eriksson, F., Fransson, E., & Nordman, H. Collisionality driven turbulent particle transport changes in DIII-D H-mode plasmas. United States. https://doi.org/10.1088/1741-4326/ab81aa
Mordijck, S., Rhodes, T. L., Zeng, L., Salmi, A., Tala, T., Petty, C. C., McKee, G. R., Reksoatmodjo, R., Eriksson, F., Fransson, E., and Nordman, H. Wed . "Collisionality driven turbulent particle transport changes in DIII-D H-mode plasmas". United States. https://doi.org/10.1088/1741-4326/ab81aa. https://www.osti.gov/servlets/purl/1618050.
@article{osti_1618050,
title = {Collisionality driven turbulent particle transport changes in DIII-D H-mode plasmas},
author = {Mordijck, S. and Rhodes, T. L. and Zeng, L. and Salmi, A. and Tala, T. and Petty, C. C. and McKee, G. R. and Reksoatmodjo, R. and Eriksson, F. and Fransson, E. and Nordman, H.},
abstractNote = {The results of the experimental dimensionless scan in this paper confirm that there is an increase in density peaking towards lower collisionality and that this can be partly linked to a shift in the turbulence regime from ITG towards TEM. However at the lowest collisionality, the changes in turbulence and transport are much more pronounced than expected from direct collisionality effect on the turbulence. In this paper, the collisionality, ν * is varied by a factor 5, while keeping ρ *, q, β, M, fixed. Additionally, a 3 Hz gas puff modulation is applied to modulate the electron density profile and extract the perturbed transport coefficients using two diagnostics. The transport analysis shows that the increase in density peaking at low ν * is linked to an increase in the inward particle pinch and not an increase in core fueling. These observations are not only in agreement with prior modeling scans of how turbulence changes as a function of collisionality and its impact upon the particle fluxes, but also with the multi-machine database (Fable E. et al 2010 Plasma Phys. Control. Fusion 52 015007) (Angioni C. et al 2003 Phys. Rev. Lett. 90 205003). The changes in turbulence across the collisionality scan were captured at large scale by the BES and at smaller scale by the DBS. A comparison with gradient-driven GENE simulations showed similar trends at both scales. Moreover, the changes observed in overall transport are in agreement with gradient-driven TGLF particle flux simulations. This indicates that TGLF/GENE when given the gradients as input, are able to reproduce the experimentally observed turbulence changes.},
doi = {10.1088/1741-4326/ab81aa},
url = {https://www.osti.gov/biblio/1618050}, journal = {Nuclear Fusion},
issn = {0029-5515},
number = 6,
volume = 60,
place = {United States},
year = {2020},
month = {5}
}

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