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A laserwire transverse electron beam size measurement system has beendeveloped and operated at the Accelerator Test Facility 2 (ATF2) at KEK.Special electron beam optics were developed to create an approximately 1 x 100{\mu}m (vertical x horizontal) electron beam at the laserwire location, whichwas profiled using a 150 mJ, 71 ps laser pulse with a wavelength of 532 nm. Theprecise characterisation of the laser propagation allows the non-Gaussiantransverse profiles of the electron beam caused by the laser divergence to bedeconvolved. A minimum vertical electron beam size of 1.07 ${\pm}$ 0.06 (stat.)${\pm}$ 0.05 (sys.) {\mu}m was measured. A vertically focussing quadrupole justbefore the laserwire was varied whilst making laserwire measurements and theprojected vertical emittance was measured to be 82.56 ${\pm}$ 3.04 pm rad.

Laserwire at the Accelerator Test Facility 2 with Sub-Micrometre Resolution