Drawing of a schematic Penning Trap (some kind of ion-cage) for the storage of charged particles by the use of a constant electric field (blue), generated by a quadrupole (a:end caps) and (b:ring electrode) and a superposed constant and homogeneous magnetic field (red), generated by a surrounding cylinder magnet (c). A particle, indicated in red (here positive) is stored in between caps of the same polarity. The particle is trapped inside a vacuum chamber. For detailed description see at <a href="https://en.wikipedia.org/wiki/Penning_Trap" class="extiw" title="en:Penning Trap">en:Penning Trap</a>
Arian Kriesch <a href="//commons.wikimedia.org/wiki/User:Akriesch" title="User:Akriesch">Akriesch</a> 23:40, 6 April 2006 (UTC)
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>