Atomic & Molecular Physics
Paultraps - Linear Paul Trap

  



Linear Paul traps (also called radio-frequency buncher) confine ions radially by an alternating quadrupolar field, the radio-frequency is applied in two phases shifted by 180°, the opposing electrodes being on same phases. In order to achieve axial confinement as well, a potential well is created by superposing a DC voltage to each ot the segments of the 4 rod electrodes (see figure). Linear Paul traps are ideal for collecting, cooling, selecting ions from an ion beam.