Correlation Analysis of 3–4 Kilohertz Core and Edge Density Fluctuations in the GAMMA 10 Tandem Mirror Device

Propagation behavior of 3–4 kHz electron density fluctuation in the core and edge regions was investigated in the GAMMA 10 tandem mirror device. Frequency analysis was employed for high spatiotemporal-resolution fluctuations measured by gold neutral beam probe (GNBP) in the central cell and Langmuir probes in the end region. We found same-frequency periodic fluctuations in both signals and applied the correlation analysis technique. By considering the geometry of the measurement system, propagation speeds of the periodic fluctuation along and across the magnetic field lines were estimated.