Production of coulomb crystal for nano ion beam

The ions trapped in a linear Paul trap crystallize at low temperature. The Coulomb crystal has extremely low emittance. By using the Coulomb crystal as an ion source, it is possible to reduce the beam size down to nanometer order keeping the beam divergence of microradian order, i.e. nano ion beam. This paper reports a preliminary experiment for production of ultra-low emittance ion beam using the Coulomb crystal. The Coulomb crystal, which consists of 40Ca+ ions, is generated by the laser cooling in the linear Paul trap. We succeed to move the Coulomb crystal with kept the crystal state. (author)