RFX-mod is an experimental fusion device built to explore and study plasma physics, especially in Reversed Field Pinch (RFP) configuration. RFX-mod allowed performing experiments with a plasma current up to 2 MA and obtaining stationary self-organized helical plasmas. Considering the results achieved so far, a significant upgrade of the device (RFX-mod2) is presently being implemented. This paper presents the feasibility study of a significant increase of the plasma current and flat-top duration via a limited upgrade of the RFX power supply system, without overstressing the poloidal windings or overcoming the power limits of the main step-down transformers (300 MVA) and maintaining the present set of thyristor converters units. The application of this concept to RFX-mod2 will be studied starting from the RFX-mod configuration, focusing on the needed modification of the present circuits and the desired improved performance. The increase of the maximum plasma current and flat-top duration, under the current and mechanical limits of the coils, can be reached using additional magnetic energy storage and a complete revision of the configuration and operating principle of the power supply system of the poloidal field coils. With this new operational concept, during the charging phase, the magnetizing winding is charged along with an additional inductor, which acts as an energy storage reservoir. The stored energy, in the order of 100 MJ, is transferred to the magnetizing winding, and thus to the plasma, via transfer resistors in the last phase of the plasma current ramp-up, to reach values of plasma current up to 2.6 MA.

RFX-mod 是一种实验聚变装置，用于探索和研究等离子体物理，特别是在反向场收缩 (RFP) 配置中。RFX-mod 允许使用高达 2 MA 的等离子体电流进行实验，并获得静止的自组织螺旋等离子体。考虑到迄今为止取得的成果，目前正在实施设备 (RFX-mod2) 的重大升级。本文介绍了通过有限升级 RFX 电源系统显着增加等离子体电流和平顶持续时间的可行性研究，同时不会对极向绕组施加过大的应力或克服主降压变压器 (300 MVA) 的功率限制) 并维护现有的一组晶闸管转换器单元。将从 RFX-mod 配置开始研究这个概念在 RFX-mod2 中的应用，专注于当前电路的必要修改和所需的改进性能。在线圈的电流和机械限制下，最大等离子体电流和平顶持续时间的增加可以通过使用额外的磁能存储和极向场电源系统的配置和工作原理的完全修改来实现线圈。使用这种新的操作概念，在充电阶段，磁化绕组与附加电感器一起充电，该电感器充当能量储存器。在等离子电流上升的最后阶段，通过传输电阻器将大约 100 MJ 的存储能量传输到磁化绕组，从而传输到等离子体，以达到高达 2.6 MA 的等离子电流值。