Measurements of Linac4 H(-) ion source beam with a magnetized Einzel lens electron dump

Linac4 is a part of the upgrade of CERN's accelerator complex for increased luminosity in the Large Hadron Collider (LHC). A new system to extract the ion beam from the plasma generator has been designed and tested, in order to improve the reliability and beam optics of the pulsed H(-) ion source. This paper presents the successfully implemented extraction system and three different beam measurements. The simulations compare well to the measurements and show that the plasma density was too low for the extraction system design during the measurements.