Statistical Analysis of Lower Hybrid Current Drive Efficiency on FTU

Journal Article · Mon Sep 26 04:00:00 EDT 2005 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2098246· OSTI ID:20726332

Calabro, Giuseppe; Pericoli Ridolfini, V ^[1]

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1. Associazione EURATOM-ENEA sulla Fusione, Via E. Fermi 45 FRASCATI-Rome (Italy)

A multi parameter statistical analysis of Lower Hybrid Current Drive (LHCD) efficiency has been carried out on all the data available for the Frascati Tokamak Upgrade (FTU). The volume of the parameters space scanned is quite large and of direct interest for ITER. The positive dependence of the CD efficiency with <Te> has been confirmed. Comparing the results with the expectations for the CD process, a reasonable agreement is found for the ion charge, Zeff, dependence (CD efficiency {proportional_to}1/(Zeff+5)), while the influence of other parameters (like qa, n-bare, BT, N parallel) is discussed in detail. Clear evidence of the synergy between the lower hybrid and electron cyclotron (EC) waves is found, provided the EC power is directly absorbed on the fast e- tails. The effect of different N parallel (LH parallel refraction index) spectra is also investigated.

• OSTI ID: 20726332
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 787; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
EFFICIENCY
ELECTRONS
FT TOKAMAK
IONS
ITER TOKAMAK
LOWER HYBRID CURRENT DRIVE
LOWER HYBRID HEATING
PLASMA
REFRACTION