We present measurements on multichannel acceleration of intense, lowhyphen;energy ion beams with a multiple electrostatic quadrupole array linear accelerator. The beam properties are investigated for different transverse and longitudinal focusing strengths, which can be adjusted independently in the accelerator. A maximum He+ion current of four times 2 mA has been accelerated from 40 to 115 keV with an acceleration efficiency of 50percnt;. Measurements and computer simulations suggest that the current is limited by transverse fields and by mismatch and misalignment of the beams, whereas longitudinal fields are of minor importance. The energy spread in the bunches is roughly three times the gap voltage.
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