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Dobbins TJ, Ida K, Suzuki C, et al. A motional Stark effect diagnostic analysis routine for improved resolution of iota in the core of the large helical device. Rev Sci Instrum. 2017;88(9):093518doi: 10.1063/1.4995808.
Dobbins, T. J., Ida, K., Suzuki, C., Yoshinuma, M., Kobayashi, T., Suzuki, Y., & Yoshida, M. (2017). A motional Stark effect diagnostic analysis routine for improved resolution of iota in the core of the large helical device. The Review of scientific instruments, 88(9), 093518. https://doi.org/10.1063/1.4995808
Dobbins, T J, et al. "A motional Stark effect diagnostic analysis routine for improved resolution of iota in the core of the large helical device." The Review of scientific instruments vol. 88,9 (2017): 093518. doi: https://doi.org/10.1063/1.4995808
Dobbins TJ, Ida K, Suzuki C, Yoshinuma M, Kobayashi T, Suzuki Y, Yoshida M. A motional Stark effect diagnostic analysis routine for improved resolution of iota in the core of the large helical device. Rev Sci Instrum. 2017 Sep;88(9):093518. doi: 10.1063/1.4995808. PMID: 28964229.
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Rev Sci Instrum. 2017 Sep;88(9):093518. doi: 10.1063/1.4995808.

A motional Stark effect diagnostic analysis routine for improved resolution of iota in the core of the large helical device.

The Review of scientific instruments

T J Dobbins, K Ida, C Suzuki, M Yoshinuma, T Kobayashi, Y Suzuki, M Yoshida

Affiliations

  1. University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
  2. National Institute for Fusion Science, 322-6 Oroshi, Toki 509-5292, Japan.

PMID: 28964229 DOI: 10.1063/1.4995808

Abstract

A new Motional Stark Effect (MSE) analysis routine has been developed for improved spatial resolution in the core of the Large Helical Device (LHD). The routine was developed to reduce the dependency of the analysis on the Pfirsch-Schlüter (PS) current in the core. The technique used the change in the polarization angle as a function of flux in order to find the value of diota/dflux at each measurement location. By integrating inwards from the edge, the iota profile can be recovered from this method. This reduces the results' dependency on the PS current because the effect of the PS current on the MSE measurement is almost constant as a function of flux in the core; therefore, the uncertainty in the PS current has a minimal effect on the calculation of the iota profile. In addition, the VMEC database was remapped from flux into r/a space by interpolating in mode space in order to improve the database core resolution. These changes resulted in a much smoother iota profile, conforming more to the physics expectations of standard discharge scenarios in the core of the LHD.

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