AI Article Synopsis
- A new soft x-ray diagnostic system has been created for the VEST experiment to measure 2D SXR emissivity profiles and analyze plasma instabilities.
- By using tomographic inversion methods, the system can convert line-integrated SXR data into 2D images, helping visualize different plasma modes.
- The system features two 20-channel arrays and specialized detectors, along with a unique filter wheel, allowing for detailed measurements without disrupting the vacuum environment.
Article Abstract
A new soft x-ray (SXR) array diagnostic system has been developed on versatile experiment spherical torus (VEST) for measurements of 2D SXR emissivity profile and identification of poloidal mode structure. Through tomographic inversion techniques, 2D SXR emissivity profile can be acquired from the line-integrated SXR data, which enables the visualization of mode structure of plasma instability, such as the magnetohydrodynamics mode. The SXR array diagnostic system consists of two 20-channel arrays positioned at the middle and the top on the same poloidal plane for horizontal and vertical lines of sight, respectively. Each array of the diagnostic system uses absolute extreme ultraviolet photodiode array as the detector. To apply appropriate filters (up to four) for different energy regimes without breaking the vacuum, a filter wheel and its rotatable vacuum feed-through are installed behind the pinhole. SXR data are acquired with a digitizer at the sampling rate of up to 125 MHz. Finally, we discuss initial measurement data obtained from Ohmic plasma in VEST.
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| http://dx.doi.org/10.1063/5.0101883 | DOI Listing |
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