Bounded Magnetic Turbulence

The Bryn Mawr Experiment is a 270 cm long, 24 cm diameter cylindrical flux-conserving vacuum chamber. The vacuum chamber is partitioned into three parts: the magnetized plasma gun source copper section, the aluminum diagnostic section, and the stainless steel dump section. The magnetized plasma gun injects magnetic helicity into a truncated zero guide field region within the flux-conserving vacuum chamber. A grounded aluminum circular plate is placed 57.3 cm away from the plasma gun. The plate effectively traps the magnetized plasma. Prior experiments on the Bryn Mawr Experiment indicate that the magnetized plasma gun generates bulk flows with speeds ranging from 70-100 km/s and steeper than Kolmogorov magnetic power spectral densities. Here we present magnetic field measurements and power spectral densities from this modified Bryn Mawr Experiment to study how the aluminum obstacle affects the broadband magnetic fluctuations.