Status of the CO2 laser ion source at CERN

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Abstract
A laser ion source using a CO 2 laser focused onto a solid target is under study at CERN for the production of high currents of highly charged heavy ions, for possible use in the preinjector for the large hadron collider. A new expansion and extraction layout was installed in this test facility, improving the alignment and making the target to extraction distance more flexible. A two solenoid beam transport system was studied for providing the matching of the beam to a radio-frequency quadrupole. An electrostatic beam transport using gridded electrostatic lenses was designed and constructed as an alternative to a magnetic system. Results show an increased overall current transmission for the electrostatic case. Investigation of the laser parameters required for the production of 1.4×10 10 Pb 25+ ions in a 5 μs pulse, has been performed using the TIR-1 laser facility at power densities up to 10 14 W cm −2 for a focal spot size of 65 μm. The results of the latest scaling are presented.

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