Electron Density Control Using Fast Gas Puffing in Reversed-field Pinch Device, TPE-RX

概要

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Electron density is scanned using fast gas puffing in the reversed-field pinch (RFP) device, TPE-RX. The gas puffing technique extends the operating range of $I_{\text{P}}/N$ from 12 to $2 \times 10^{-14}$ Am ($I_{\text{P}}$ and $N$ denote the plasma current and line density, respectively). It is estimated that the poloidal beta, $\beta_{\text{P}}$, increases as $I_{\text{P}}/N$ decreases. This $\beta_{\text{P}}$ scaling with $I_{\text{P}}/N$ in TPE-RX confirms a similar tendency previously obtained in other RFP plasmas. The radiation fraction increases from ${\sim}20$% in the low-density regime to ${\sim}35$% in the highest-density regime. This result indicates that the lowest $I_{\text{P}}/N$ limit in RFP is similar to the density limit in tokamak plasmas.
Japan Society of Applied Physicsの論文
2004-09-15