ATF linac commissioning

Accelerator Test Facility (ATF) [1] is now under construction in the TRISTAN Assembly Hall in order to generate a extremely low emittance beam for linear collider studies. It consists of 1.54GeV S-band Linac, beam transport line, damping ring and extraction line. The S-band Linac is an injector of the damping ring which supplies a multi-bunch train beam which is 20 bunches with 2x10(10) electrons/bunch and 2.8 ns bunch spacing. The newly developed techniques which are high gradient accelerating unit, precise alignment system, beam energy compensation system, compact modulators, multi-bunch beam monitors are used in this linac. The commissioning of the linac was held on November 1995. The beam experiments on a high gradient acceleration and a beam energy compensation for the transient beam loading were performed. The results of these experiments are shown.