Persistent Spiral-Arm Structure of a Rotating Plasma in a Stationary Gas

Ion Transport Pulsation in the Potential Well of a Magnetized Plasma

“…The temporal behavior of the ion density measured on the two-dimensional plane perpendicular to the constant axial magnetic field reveals an alternate reaction of ion accumulation and release in the plasma. Similar spiral structures in plasmas have been observed and discussed [3][4][5].…”

Spontaneous Fluctuations of a Temperature Filament in a Magnetized Plasma

“…These effects are not present when a single small Langmuir probe is used. For completeness, it should be mentioned that a phase-locked spiral (l 2) has been previously observed [8] in an argon plasma column generated by electron cyclotron waves, and a persistent spiral-arm structure has been formed [9] in a rotating plasma embedded in a stationary gas.…”

Spiral Structures in Magnetized Rotating Plasmas

“…We are planning to develop our theory to understand the spiral structures observed in a gun-produced plasma [5]. It is worth noting that our study may contribute for understanding the mechanism of spiral galaxy formation.…”

“…Coherent structures have been recently observed in laboratories [1][2][3][4][5][6] and are subjects of theoretical analysis for understanding underlying physics [7]. In both ECR plasmas [4] and gun-produced plasmas [5], two-arms spirals are commonly observed, and in particular the spiral structure observed in the ECR plasmas have interesting features: (1) the stationary structure is observed in a certain range of the background pressure, (2) the direction of the arm stretching is reversed when the magnetic field is reversed, and (3) the arm winding is identified as an Archimedes spiral, that is the curve spiraling into the origin which in polar coordinates is given by the equation…”