Soft x-ray tomography for real-time applications: Present status at Tore Supra and possible future developments

D. Mazon, D. Vezinet, D. Pacella, D. Moreau, L. Gabelieri, A. Romano, P. Malard, J. Mlynar, R. Masset, P. Lotte

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Abstract

This paper is focused on the soft x-ray (SXR) tomography system setup at Tore Supra (DTOMOX) and the recent developments made to automatically get precise information about plasma features from inverted data. The first part describes the main aspects of the tomographic inversion optimization process. Several observations are made using this new tool and a set of shape factors is defined to help characterizing the emissivity field in a real-time perspective. The second part presents a detailed off-line analysis comparing the positions of the magnetic axis obtained from a magnetic equilibrium solver, and the maximum of the reconstructed emissivity field for ohmic and heated pulses. A systematic discrepancy of about 5 cm is found in both cases and it is shown that this discrepancy increases during sawtooth crashes. Finally, evidence of radially localized tungsten accumulation with an in-out asymmetry during a lower hybrid current drive pulse is provided to illustrate the DTOMOX capabilities for a precise observation of local phenomena. © 2012 American Institute of Physics.
Original languageEnglish
Article number063505
Pages (from-to)-
JournalReview of Scientific Instruments
Volume83
Issue number6
DOIs
Publication statusPublished - Jun 2012
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Mazon, D., Vezinet, D., Pacella, D., Moreau, D., Gabelieri, L., Romano, A., ... Lotte, P. (2012). Soft x-ray tomography for real-time applications: Present status at Tore Supra and possible future developments. Review of Scientific Instruments, 83(6), -. [063505]. https://doi.org/10.1063/1.4730044