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Reflectometry is considered to be one of the key diagnostics to measure density profiles or density fluctuations of fusion oriented plasmas. The electromagnetic wave launched into the plasma is reflected at the cutoff density layer of the ordinary (O) mode or the extraordinary (X) mode. The plasma density profile can be obtained by taking the phase difference between the incident wave and the reflected...
We conducted a GPR monitoring to observe the extension of fractures created by hydraulic fracturing. To achieve this monitoring, a measurement system with higher time accuracy and faster data acquisition rate are needed. We designed a VNA (Vector Network Analyzer) measurement system using a Vivaldi array antenna. The VNA measurement system has the time resolution of 1 ps/sample and the data acquisition...
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