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In order to reduce the emittance and increase the transported beam current from the ISIS Penning-type H − ion source, improvements to the extraction system are required. This ion source is currently being commissioned on the front end test stand at the Rutherford Appleton Laboratory, which demands higher extraction energies, higher beam currents, and smaller emittances. To facilitate this, the present geometry requires optimization. This paper details the experimental and simulation studiesdoi:10.1063/1.3277139 pmid:20192377 fatcat:gm3o4z4c6zh4xp2gowq4awysv4