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In a Low Energy Beam Transport line (LEBT), the emittance growth due to thebeam's own space charge is typically suppressed by way of neutralization fromeither electrons or ions, which originate from ionization of the backgroundgas. In cases where the beam is chopped, the neutralization pattern changesthroughout the beginning of the pulse, causing the Twiss parameters to differsignificantly from their steady state values, which, in turn, may result inbeam losses downstream. For a modest beam perveance, there is an alternativesolution, in which the beam is kept un-neutralized in the portion of the LEBTthat contains the chopper. The emittance can be nearly preserved if thetransition to the un-neutralized section occurs where the beam exhibits lowtransverse tails. This report discusses the experimental realization of such ascheme at Fermilab's PXIE, where low beam emittance dilution was demonstrated.

Low Emittance Growth In a LEBT With Un-Neutralized Section