A real-time control system has been developed to control the amplitude, phase, and offset of bulk plasma parameters inside an oscillating magnetic helicity injector. Control software running entirely on an Nvidia Tesla P40 graphical processing unit is able to receive digitizer inputs and send response patterns to a Pulse Width Modulation (PWM) controller with a minimum control loop period of 12.8 µs. With an input digitization rate of 10 MS/s, a three-parameter proportional integral differential controller is shown to be sufficient to inform the PWM controller to drive the desired oscillating plasma waveform with a frequency of 16.6 kHz that is located near the resonance of a coupled RLC circuit. In particular, the temporal phase of the injector waveform is held within 10° of the target value. Control is demonstrated over the toroidal modal structure of the imposed magnetic perturbations of the helicity injection system, allowing a new class of discharges to be studied.

中文翻译：

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使用图形处理单元的振荡磁力螺旋喷射器的高速反馈控制

已经开发了一种实时控制系统来控制振荡磁螺旋注入器内体等离子体参数的幅度、相位和偏移。完全在 Nvidia Tesla P40 图形处理单元上运行的控制软件能够接收数字化仪输入并将响应模式发送到脉冲宽度调制 (PWM) 控制器，最小控制循环周期为 12.8 µs。在输入数字化速率为 10 MS/s 的情况下，三参数比例积分微分控制器显示足以通知 PWM 控制器驱动所需的振荡等离子体波形，频率为 16.6 kHz，该波形位于谐振器的谐振附近。耦合 RLC 电路。特别是，喷射器波形的时间相位保持在目标值的 10°以内。对螺旋注入系统的强加磁扰的环形模态结构进行了控制，允许研究一类新的放电。