【正】 Beams of C<sub>2</sub><sup>+</sup>-C<sub>8</sub><sup>+</sup> clusters have been accelerated to 3 MeV in 1.7 MV tandemaccelerator.The beam intensity of small C-cluster is large enough for some physical ex-periments.The gas density in the stripper cell is an important parameter for obtainingmaximum C<sub>m</sub><sup>+</sup> cluster beam.