Development of high-frequency magnetic probe for plasma diagnostics of XuanLong-50
Abstract
A high-frequency magnetic probe has been designed and developed on XuanLong-50 (EXL-50) spherical torus to measure high-frequency magnetic field fluctuations caused by energetic ions and electrons in the plasma. The magnetic loop, radio filters, radio-frequency (RF) limiter, and data acquisition system of the probe are described in detail. The results of the preliminary test show that the probe can have a frequency response within the 1- 180 MHz range. The fluctuation data from the EXL-50 plasma were analyzed in the time-frequency domain using fast Fourier transforms. Using this diagnostic system, distinct high-frequency instabilities were detected. In particular, significant frequency chirping was observed, which is consistent with the bump on tail drive instability predicted by the Berk-Breizman model.
Keywords
Cite
@article{arxiv.2208.05323,
title = {Development of high-frequency magnetic probe for plasma diagnostics of XuanLong-50},
author = {Mingyuan Wang and Xiuchun Lun and Xiaokun Bo and Bing Liu and Adi Liu and Yuejiang Shi},
journal= {arXiv preprint arXiv:2208.05323},
year = {2023}
}