Assessment of the LH wave for demo in pulsed and steady state scenario

A. Cardinali, E. Barbato, C. Castaldo, S. Ceccuzzi, R. Cesario, M. Marinucci, F. Mirizzi, L. Panaccione, G.L. Ravera, F. Santini, G. Schettini, A.A. Tuccillo

Research output: Contribution to conferencePaper

Abstract

The Lower Hybrid Current Drive (LHCD) has been analysed in DEMO tokamak plasma in the «pulsed and steady state regime» considering two plasma scenarios characterized, respectively, by flat density profile and peaked density profiles. We have obtained LH deposition profiles in cases of neglecting the effect of spectral broadening produced by PI at the edge. By comparing the Power Deposition Profiles for both DEMO scenarios («flat» and «peaked»), the SOL of DEMO does not play any role in the absorption of the LH wave. In all cases the deposition is localized inside the separatrix layer r/a≤1. By lowering the parallel wave-number peak of the power spectrum from 1.8 to 1.5, the accessibility condition in both case prevents the power from reaching the deposition layer apart from a small fraction which pertains to the higher n∥ of the power spectrum. The spectrum centred at 1.8 is suggested to be useful in DEMO. More realistically, as supported by available data of LHCD in a wide range of operating densities, the effect of parametric decay instability (PDI) can produce a spectral broadening which should be included in the simulations. Further studies would be necessary for assessing the temperature profiles in the SOL at reactor-graded conditions. This is because, if the SOL temperature is at least of the order of 50 to 100 eV, the effect of PDI broads the spectrum up to n∥≤10, and the deposition profile is slightly wider but not much shifted outwards. © 2014 American Institute of Physics.
Original languageEnglish
DOIs
Publication statusPublished - 2014
Externally publishedYes
Event20th Topical Conference on Radiofrequency Power in Plasmas - , Italy
Duration: 1 Jan 2014 → …

Conference

Conference20th Topical Conference on Radiofrequency Power in Plasmas
CountryItaly
Period1/1/14 → …

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Cardinali, A., Barbato, E., Castaldo, C., Ceccuzzi, S., Cesario, R., Marinucci, M., ... Tuccillo, A. A. (2014). Assessment of the LH wave for demo in pulsed and steady state scenario. Paper presented at 20th Topical Conference on Radiofrequency Power in Plasmas, Italy. https://doi.org/10.1063/1.4864586