Speaker
Description
The Keda Torus eXperiment (KTX), a medium-sized Reversed Field Pinch (RFP)
device at the University of Science and Technology of China (USTC), serves as a
critical facility for investigating toroidal plasma confinement and self-organization.
Designed for high-current operation up to 1 MA, recent systematic upgrades to the
ohmic power supply and energy storage (reaching 5 MJ) have successfully enabled
plasma currents exceeding 500 kA with peak heating power of 30 MW.
A sophisticated 96-channel active feedback control system is now operational for
effective MHD mode suppression and error field correction, extending discharge
durations beyond 100 ms. To further enhance plasma stability and confinement,
precise equilibrium field regulation is underway. This work focuses on optimizing
plasma positioning and shaping to provide a stable foundation for high-performance
discharges, such as the transition toward the Quasi-Single Helicity (QSH) state.
Experimental investigations into edge turbulence are also being conducted to clarify
transport mechanisms at the plasma boundary. Utilizing a dual-biasing electrodes
system for electric field manipulation, these studies aim to understand the relationship
between rotation control and turbulence suppression. These efforts are supported by
advanced diagnostics, including a terahertz polarimeter-interferometer for equilibrium
reconstruction and a double-foil soft X-ray system for monitoring plasma instabilities.
Furthermore, the successful testing of a novel Compact Torus Injection (CTI) system,
achieving injection speeds up to 300 km/s, has demonstrated enhanced core fueling
and density control capabilities. Together with numerical simulations exploring
helicity and drift flows, these comprehensive studies on KTX provide multi-faceted
insights into universal physics of magnetic magnetic confinement fusion plasma.
The details of KTX experimental results will be presented in this conference.
| Keyword-1 | fusion |
|---|---|
| Keyword-2 | active feedback |