Theory, design parameters, and construction details are presented for a linac which accelerates charged microparticles in the 1–10 μ diam range to meteoric velocities. The linac is of the Sloan‐Lawrence (low‐frequency, ac driven) type and contains 92 accelerating gaps with 100 kV accelerating potential applied at each gap. Particles are injected into the linac after preacceleration by a 1.6 MV modified Van de Graaff, giving a total accelerating potential of 10.8 MV for the system. In a significant departure from conventional accelerator practice, the linac is adapted to single particle operation by employing a square wave driving voltage with the frequency automatically adjusted from 12.5 to 125 kHz according to the variable velocity of each injected particle. Radial focusing is entirely second‐order and is adequate to contain the particle ``beam'' within 1.8 cm diam. Compared to the Van de Graaff alone, the linac provides a particle mass increase of about 300 times for a given velocity, or a velocity increase of about 2.5 times for a given mass.