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In trapped plasmas, electric fields and collective effects shift the cyclotron mode frequencies away from the “bare” cyclotron frequency for each species s . Here, these shifts are measured on a set of cyclotron modes ( m = 0 , 1 , and 2 ) with cos ( m θ ) azimuthal dependence in near rigid-rotor multi-species ion plasmas. We observe that these frequency shifts are dependent on the plasma density, through the E × B rotation frequency f E , and on the “local” charge concentration δ s of species s , in close agreement with theory. |
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