Paul-trap experiment on the effect of linear focusing-field fluctuations on the long-term stability of an intense hadron beam

The compact non-neutral plasma trap systems named "S-POD" have been developed at Hiroshima University as an experimental simulator of beam dynamics. S-POD is based either on a linear Paul-trap or on a Penning trap and can approximately reproduce the collective motion of a relativistic charged-particle beam observed in the center-of-mass frame. We here employ the Paul trap system to investigate beam instability induced by small fluctuations of linear focusing-field that can affect intense beam transport over long propagation distance. In the present study, we consider the fluctuation whose structure is independent of lattice periodicity, for example, due to the noise on power sources for quadrupole magnets. It is confirmed that a resonant instability driven by the fluctuation induces slow beam loss. (author)