IOP : A low energy ion beamline for TwinEBIS

A low energy beamline has been designed for the TwinEBIS setup. The beamline will be used to transport ions extracted from the electron beam ion source into an accelerating radio frequency quadrupole or into secondary devices, like a time of flight-mass spectrometer, attached to the beamline via a fast three way 20o ion switchyard. Optional injection of ions from an external source into the electron beam ion source is foreseen. In this article the general layout of the beamline is presented and supported with simulations of the ion-optical matching. Furthermore, the switchyard and gridded electrostatic lenses, chosen as the main focusing elements, have been simulated to assess their impact on the beam quality and the dynamics of secondary electrons emitted by the gridded lenses. In addition, the beamline includes general diagnostic devices, including a bidirectional pepperpot beam profiler. An overview of the diagnostic elements is given.