  The Proton Improvement Plan II (PIP-II) at Fermilab is a program of upgrades
to the injection complex. At its core is the design and construction of a
CW-compatible, pulsed H- superconducting RF linac. To validate the concept of
the front-end of such machine, a test accelerator (a.k.a. PXIE) is under
construction. It includes a 10 mA DC, 30 KeV H- ion source, a 2 m-long Low
Energy Beam Transport (LEBT), a 2.1 MeV CW RFQ, followed by a Medium Energy
Beam Transport (MEBT) that feeds the first of 2 cryomodules increasing the beam
energy to ~25 MeV, and a High Energy Beam Transport section (HEBT) that takes
the beam to a dump. The ion source and LEBT, which includes 3 solenoids,
several clearing electrodes/collimators and a chopping system, have been built,
installed, and commissioned to full specification parameters. This report
presents the outcome of our commissioning activities, including phase-space
measurements at the end of the beam line under various neutralization schemes
obtained by changing the electrodes' biases and chopper parameters.
