A highly intense pulsed supersonic CH(X(2)Pi) radical beam source was developed by use of the C(D-1) + H-2 reaction. CH radicals were state-selected by an electrostatic hexapole field. The focusing curves for the single state-selected CH were measured for the first time by a saturated laser-induced fluorescence (LIF) spectroscopy for the R-branch in A(2)Delta(3/2)-X(2)Pi(1/2) transition. The maximum CH flux intensity in the lowest \J. F. M> state, \1/2, 2. 1/2> was measured by LIF to be 3.2x10(12) rad cm(-2), s(-1) at the focusing point of 150 cm downstream from the nozzle. (C) 2004 Elsevier B.V. All rights reserved.