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Simulations of lower hybrid current drive and Ohmic transformer recharge

V. Fuchs, I.P. Shkarofsky, R.A. Cairns, P.T. Bonoli1989年被引用 23Nuclear FusionIF 3出版社

It is planned to use lower hybrid current drive (LHCD) in the Tokamak de Varennes to support continuous operation for the entire duration (30 s) of the toroidal field. In the nominal Ohmic equilibrium, lower hybrid slow wave accessibility is poor (n1 access ≃ 3), which severely limits the number of resonant electrons and LHCD efficiency. Careful modelling is therefore needed to estimate the minimum RF power requirements and the recharge possibilities while maintaining a constant total plasma current. The Bonoli-Englade code has been modified with respect to evolution of narrow Brambilla spectra, RF current diffusion and proportional-integral-derivative feedback control of the plasma current. It appears that 200 kA of current could be maintained in a steady state with about 1 MW of LH power at 3.7 GHz and with n0 = 4 × 1019 m−3. With the same power, in an alternating Ohmic/RF scenario, the Ohmic transformer could be recharged to 2 V·s in about four seconds at a slightly reduced density.

日本語訳

トカマク・ド・ヴァレンヌにおいて、トロイダル磁場の全持続時間(30秒)にわたる連続運転を支援するために、低域混成波電流駆動(LHCD)を使用することが計画されている。公称オーミック平衡状態では、低域混成波の遅波のアクセシビリティは悪く(n1 access ≃ 3)、共鳴電子の数とLHCD効率が著しく制限される。したがって、総プラズマ電流を一定に維持しながら、最小RF電力要件と再充電の可能性を推定するために、慎重なモデリングが必要である。Bonoli-Engladeコードは、狭いBrambillaスペクトルの時間発展、RF電流拡散、およびプラズマ電流の比例-積分-微分フィードバック制御に関して修正されている。3.7 GHz、n0 = 4 × 1019 m−3において、約1 MWのLH電力で200 kAの電流が定常状態に維持できるように思われる。同じ電力で、オーミック/RFを交互に行うシナリオでは、わずかに密度を下げた状態で、オーミック変圧器を約4秒で2 V·sまで再充電できる可能性がある。

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Current driveLower hybridLower hybrid current driveOhmic heating
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