研究目的
To develop an ion current measurement instrument capable of operating with a direct view of high temperature plasmas, significantly reducing particle and radiation-induced noise current.
研究成果
The implementation of hardware features using electric and magnetic fields along with physical shielding has enabled operation of the detector with a direct view of a high temperature plasma, reducing noise levels and variability from tens of microamps to tens of nanoamps. The largest noise contributors were identified as plasma ions and UV radiation.
研究不足
The remaining noise is likely dominated by photoelectric loss from the edges of the detector elements and any stray ions entering the instrument with energies over 500 eV.
1：Experimental Design and Method Selection:
The instrument was designed to measure the current of high energy, high mass ions created through the interaction of a diagnostic beam with a magnetically confined high temperature plasma. It utilizes electric fields, magnetic fields, and physical shielding to mitigate noise.
2：Sample Selection and Data Sources:
The instrument was tested in the Madison Symmetric Torus (MST) Reversed Field Pinch at the University of Wisconsin, Madison, during ohmically heated improved confinement plasmas.
3：List of Experimental Equipment and Materials:
The prototype instrument includes components such as external shielding, permanent magnets, electrostatic gratings, and insulating shields.
4：Experimental Procedures and Operational Workflow:
The instrument was operated in various configurations to identify and mitigate sources of noise current, including plasma ions and UV radiation.
5：Data Analysis Methods:
The total current measured by the detector elements was analyzed to quantify noise levels and variability.
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