【新华社】中国“人造太阳”实验找到突破密度极限的方法

Core Viewpoint - The research team from the Hefei Institutes of Physical Science has confirmed the existence of a density free zone in the EAST (Experimental Advanced Superconducting Tokamak) device, providing significant physical evidence for high-density operation in magnetic confinement nuclear fusion [4][6]. Group 1: Research Findings - The EAST device has successfully demonstrated a method to overcome the plasma density limit, which is crucial for achieving controlled nuclear fusion [4][5]. - The research revealed that boundary impurities play a key role in triggering radiation instability, which is critical in reaching the density limit [6]. - The experimental results align closely with the predictions made by the newly developed boundary plasma-wall interaction self-organization (PWSO) theoretical model [6]. Group 2: Technological Implications - The findings provide important insights into the physical mechanisms behind the density limit, which has been a long-standing challenge in the field of nuclear fusion [5][6]. - By utilizing techniques such as electron cyclotron resonance heating and pre-filling gas, the research team was able to delay the onset of the density limit and plasma disruption [6]. - This innovative work is expected to facilitate the understanding and operation of tokamaks at high densities, potentially advancing the development of nuclear fusion technology [6].