Scattering from edge density fluctuations on the lower hybrid waves in FTU

Giuseppe Calabrò, V. Pericoli Ridolfini

Research output: Contribution to conferencePaper

Abstract

Careful measurements of density fluctuations in the scrape-off layer (SOL) of Frascati Tokamak Upgrade (FTU) plasma have been carried out. The analytical model proposed by Andrews and Perkins for the scattering of lower hybrid (LH) waves by density fluctuations will constitute the basis of our discussion. The envelop of the scattering processes occurring on single points sampled along the poloidal profile of the launching antenna at fixed step Δθ is considered. The trajectories and N∥(LH parallel refraction index) evolution of the corresponding ray bundles are followed using the fast ray tracing code (FRTC), coupled to the transport code ASTRA to infer the radial absorption profile on a given target plasma. Interpretative ASTRA simulations are presented to support the correctness of the scattering model assumed. The current drive (CD) efficiency calculated is then compared with that measured for the shot assumed as reference and with the scaling valid for FTU. Comparison of measured pump frequency spectral broadening on FTU and theoretical prediction is also presented. © 2007 American Institute of Physics.
Original languageEnglish
DOIs
Publication statusPublished - 2007
Externally publishedYes
Event17th Topical Conference on Radio Frequency Power in Plasmas - , United States
Duration: 1 Jan 2007 → …

Conference

Conference17th Topical Conference on Radio Frequency Power in Plasmas
CountryUnited States
Period1/1/07 → …

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Calabrò, G., & Ridolfini, V. P. (2007). Scattering from edge density fluctuations on the lower hybrid waves in FTU. Paper presented at 17th Topical Conference on Radio Frequency Power in Plasmas, United States. https://doi.org/10.1063/1.2800495