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- W1597558306 abstract "Bootstrap current is regarded as a good candidate to sustain a large fraction of the plasma current, in the so-called “advanced” regimes of a tokamak reactor. It is thus important to study the stability of such discharges and to control them. By means of fast wave electron heating (FWEH, up to 9.5 MW), stationary high bootstrap discharges (during 5 seconds, ≈40%) were routinely obtained on Tore Supra. The bootstrap profile is computed with a matrix formulation (1,2) and is directly compared to the experimental determination of the non-inductive current. The simulation of the loop voltage either with the code CRONOS (1D current diffusion code) using the profile of bootstrap current, or with the knowledge of the resistivity, allows also a self consistent determination of the bootstrap current. The bootstrap induced by the FWEH is mainly due to the central pressure electron gradient (the central power deposition strongly peaks the electronic temperature). A 0D study shows that the bootstrap current (Ibs) varies linearly with the poloidal beta (Ibs/Ip≈Cbsβp). The effect of various plasma parameters (toroidal field Bt, line-integrated density nl, ion and electron temperature, plasma current Ip) on the bootstrap profile, and fraction are analysed." @default.
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- W1597558306 date "1997-01-01" @default.
- W1597558306 modified "2023-10-14" @default.
- W1597558306 title "FWEH induced high bootstrap current on Tore Supra" @default.
- W1597558306 doi "https://doi.org/10.1063/1.53415" @default.
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