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Radial electric field in JET advanced tokamak scenarios with toroidal field ripple

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Abstract
A dedicated campaign has been run on JET to study the effect of toroidal field (TF) ripple on plasma performance. Radial electric field measurements from experiments on a series of plasmas with internal transport barriers (ITBs) and different levels of ripple amplitude are presented. They have been calculated from charge exchange measurements of impurity ion temperature, density and rotation velocity profiles, using the force balance equation. The ion temperature and the toroidal and poloidal rotation velocities are compared in plasmas with both reversed and optimized magnetic shear profiles. Poloidal rotation velocity (v(theta)) in the ITB region is measured to be of the order of a few tens of km s(-1), significantly larger than the neoclassical predictions. Increasing levels of the TF ripple are found to decrease the ion temperature gradient in the ITB region, a measure for the quality of the ITB, and the maximum value of v(theta) is reduced. The poloidal rotation term dominates in the calculations of the total radial electric field (E-r), with the largest gradient in E-r measured in the radial region coinciding with the ITB.
Keywords
JOINT EUROPEAN TORUS, TRANSPORT BARRIERS, radial electric field, transport barriers, plasma, TURBULENCE

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MLA
Crombé, Kristel, et al. “Radial Electric Field in JET Advanced Tokamak Scenarios with Toroidal Field Ripple.” PLASMA PHYSICS AND CONTROLLED FUSION, vol. 51, no. 5, 2009.
APA
Crombé, K., Andrew, Y., Biewer, T., Blanco, E., de Vries, P., Giroud, C., … Zastrow, K.-D. (2009). Radial electric field in JET advanced tokamak scenarios with toroidal field ripple. PLASMA PHYSICS AND CONTROLLED FUSION, 51(5).
Chicago author-date
Crombé, Kristel, Y Andrew, TM Biewer, E Blanco, PC de Vries, C Giroud, NC Hawkes, et al. 2009. “Radial Electric Field in JET Advanced Tokamak Scenarios with Toroidal Field Ripple.” PLASMA PHYSICS AND CONTROLLED FUSION 51 (5).
Chicago author-date (all authors)
Crombé, Kristel, Y Andrew, TM Biewer, E Blanco, PC de Vries, C Giroud, NC Hawkes, A Meigs, T Tala, M von Hellermann, and K-D Zastrow. 2009. “Radial Electric Field in JET Advanced Tokamak Scenarios with Toroidal Field Ripple.” PLASMA PHYSICS AND CONTROLLED FUSION 51 (5).
Vancouver
1.
Crombé K, Andrew Y, Biewer T, Blanco E, de Vries P, Giroud C, et al. Radial electric field in JET advanced tokamak scenarios with toroidal field ripple. PLASMA PHYSICS AND CONTROLLED FUSION. 2009;51(5).
IEEE
[1]
K. Crombé et al., “Radial electric field in JET advanced tokamak scenarios with toroidal field ripple,” PLASMA PHYSICS AND CONTROLLED FUSION, vol. 51, no. 5, 2009.
@article{791927,
  abstract     = {{A dedicated campaign has been run on JET to study the effect of toroidal field (TF) ripple on plasma performance. Radial electric field measurements from experiments on a series of plasmas with internal transport barriers (ITBs) and different levels of ripple amplitude are presented. They have been calculated from charge exchange measurements of impurity ion temperature, density and rotation velocity profiles, using the force balance equation. The ion temperature and the toroidal and poloidal rotation velocities are compared in plasmas with both reversed and optimized magnetic shear profiles. Poloidal rotation velocity (v(theta)) in the ITB region is measured to be of the order of a few tens of km s(-1), significantly larger than the neoclassical predictions. Increasing levels of the TF ripple are found to decrease the ion temperature gradient in the ITB region, a measure for the quality of the ITB, and the maximum value of v(theta) is reduced. The poloidal rotation term dominates in the calculations of the total radial electric field (E-r), with the largest gradient in E-r measured in the radial region coinciding with the ITB.}},
  author       = {{Crombé, Kristel and Andrew, Y and Biewer, TM and Blanco, E and de Vries, PC and Giroud, C and Hawkes, NC and Meigs, A and Tala, T and von Hellermann, M and Zastrow, K-D}},
  issn         = {{0741-3335}},
  journal      = {{PLASMA PHYSICS AND CONTROLLED FUSION}},
  keywords     = {{JOINT EUROPEAN TORUS,TRANSPORT BARRIERS,radial electric field,transport barriers,plasma,TURBULENCE}},
  language     = {{eng}},
  number       = {{5}},
  title        = {{Radial electric field in JET advanced tokamak scenarios with toroidal field ripple}},
  url          = {{http://dx.doi.org/10.1088/0741-3335/51/5/055005}},
  volume       = {{51}},
  year         = {{2009}},
}

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