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Title: Filamentary velocity scaling validation in the TCV tokamak

Abstract

A large database of reciprocating probe data from the edge plasma of TCV (Tokamak à Configuration Variable) is used to test the radial velocity scalings of filaments from analytical theory [Myra et al., Phys. Plasmas 13, 112502 (2006)]. The measured velocities are mainly scattered between zero and a maximum velocity which varies as a function of size and collisionality in agreement with the analytical scalings. The scatter is consistent with mechanisms that tend to slow the velocity of individual filaments. While the radial velocities were mainly clustered between 0.5 and 2 km/s, a minority reached outward velocities as high as 5 km/s or inward velocities as high as −4 km/s. Inward moving filaments are only observed in regions of high poloidal velocity shear in discharges with B × ∇B away from the X-point, a new finding. The filaments have diameters clustered between 3 and 11 mm, and normalized sizes â clustered between 0.3 and 1.1, such that most filaments populate the resistive-ballooning regime; therefore, most of the filaments in TCV have radial velocities with little or no dependence on collisionality. Improvements in cross-correlation techniques and conditional averaging techniques are discussed which reduce the sizes determined for the largest filaments, including those larger than the scrape-off layer.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4];  [4]; ORCiD logo [4]; ORCiD logo [5];  [6];  [4];  [4]; ORCiD logo [4];  [7]; ORCiD logo [8]; ORCiD logo [9];  [4];  [4]; ORCiD logo [4]; ORCiD logo [10];  [7]
  1. Center for Energy Research (CER), University of California San Diego (UCSD), La Jolla, California 92093-0417, USA; Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland
  2. Center for Energy Research (CER), University of California San Diego (UCSD), La Jolla, California 92093-0417, USA
  3. Lodestar Research Corporation, Boulder, 2400 Central Avenue, Boulder, Colorado 80301, USA
  4. Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland
  5. Consorzio RFX (CNR, ENEA, INFN, Universitá di Padova, Acciaierie Venete SpA), Corso Stati Uniti 4, 35127 Padova, Italy
  6. FOM Institute DIFFER “Dutch Institute for Fundamental Energy Research,” De Zaale 20, 5612 AJ Eindhoven, The Netherlands
  7. CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
  8. IPP.CR, Institute of Plasma Physics AS CR, Za Slovankou 3, 182 21 Praha 8, Czech Republic
  9. York Plasma Institute, University of York, York YO10 5DQ, United Kingdom
  10. Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland; York Plasma Institute, University of York, York YO10 5DQ, United Kingdom
Publication Date:
Research Org.:
Lodestar Research Corp., Boulder, CO (United States); Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
Contributing Org.:
TCV Team,; EUROfusion MST1 Team
OSTI Identifier:
1540225
Alternate Identifier(s):
OSTI ID: 1460602
Grant/Contract Number:  
FG02-97ER54392; SC0010529
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 7; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
Physics

Citation Formats

Tsui, C. K., Boedo, J. A., Myra, J. R., Duval, B., Labit, B., Theiler, C., Vianello, N., Vijvers, W. A. J., Reimerdes, H., Coda, S., Février, O., Harrison, J. R., Horacek, J., Lipschultz, B., Maurizio, R., Nespoli, F., Sheikh, U., Verhaegh, K., and Walkden, N. Filamentary velocity scaling validation in the TCV tokamak. United States: N. p., 2018. Web. doi:10.1063/1.5038019.
Tsui, C. K., Boedo, J. A., Myra, J. R., Duval, B., Labit, B., Theiler, C., Vianello, N., Vijvers, W. A. J., Reimerdes, H., Coda, S., Février, O., Harrison, J. R., Horacek, J., Lipschultz, B., Maurizio, R., Nespoli, F., Sheikh, U., Verhaegh, K., & Walkden, N. Filamentary velocity scaling validation in the TCV tokamak. United States. doi:10.1063/1.5038019.
Tsui, C. K., Boedo, J. A., Myra, J. R., Duval, B., Labit, B., Theiler, C., Vianello, N., Vijvers, W. A. J., Reimerdes, H., Coda, S., Février, O., Harrison, J. R., Horacek, J., Lipschultz, B., Maurizio, R., Nespoli, F., Sheikh, U., Verhaegh, K., and Walkden, N. Sun . "Filamentary velocity scaling validation in the TCV tokamak". United States. doi:10.1063/1.5038019. https://www.osti.gov/servlets/purl/1540225.
@article{osti_1540225,
title = {Filamentary velocity scaling validation in the TCV tokamak},
author = {Tsui, C. K. and Boedo, J. A. and Myra, J. R. and Duval, B. and Labit, B. and Theiler, C. and Vianello, N. and Vijvers, W. A. J. and Reimerdes, H. and Coda, S. and Février, O. and Harrison, J. R. and Horacek, J. and Lipschultz, B. and Maurizio, R. and Nespoli, F. and Sheikh, U. and Verhaegh, K. and Walkden, N.},
abstractNote = {A large database of reciprocating probe data from the edge plasma of TCV (Tokamak à Configuration Variable) is used to test the radial velocity scalings of filaments from analytical theory [Myra et al., Phys. Plasmas 13, 112502 (2006)]. The measured velocities are mainly scattered between zero and a maximum velocity which varies as a function of size and collisionality in agreement with the analytical scalings. The scatter is consistent with mechanisms that tend to slow the velocity of individual filaments. While the radial velocities were mainly clustered between 0.5 and 2 km/s, a minority reached outward velocities as high as 5 km/s or inward velocities as high as −4 km/s. Inward moving filaments are only observed in regions of high poloidal velocity shear in discharges with B × ∇B away from the X-point, a new finding. The filaments have diameters clustered between 3 and 11 mm, and normalized sizes â clustered between 0.3 and 1.1, such that most filaments populate the resistive-ballooning regime; therefore, most of the filaments in TCV have radial velocities with little or no dependence on collisionality. Improvements in cross-correlation techniques and conditional averaging techniques are discussed which reduce the sizes determined for the largest filaments, including those larger than the scrape-off layer.},
doi = {10.1063/1.5038019},
journal = {Physics of Plasmas},
number = 7,
volume = 25,
place = {United States},
year = {2018},
month = {7}
}

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Works referenced in this record:

Blob structure and motion in the edge and SOL of NSTX
journal, January 2016

  • Zweben, S. J.; Myra, J. R.; Davis, W. M.
  • Plasma Physics and Controlled Fusion, Vol. 58, Issue 4, Article No. 044007
  • DOI: 10.1088/0741-3335/58/4/044007