Multipole electric-field manipulation of radio-frequency non-neutral plasmas.
Maero G., Pozzoli R., Romé M., Chen S.
Although unconventional, a small-amplitude RF drive can be used to generate a non-neutral (electron) plasma in magneto-electrostatic trapping devices by residual gas ionization in the ultra-high vacuum regime. RF heating and partial plasma neutralization give rise to new phenomena with respect to conventional single-species plasmas. In particular, the use of multipole RF drives on azimuthally segmented electrodes may result in plasma compression, excitation of fluid modes, or enable simultaneous control of charge and position of the electron column. Finally, the effective trapping of an ion fraction suggests the opportunity to use this technique to accumulate and manipulate ion bunches and beams.