Demonstration of matching a laser ion source to the GSI RFQ-Maxilac linear accelerator and the acceleration of a 1.8-mA current beam of Ta 10+ ions up to 45 keV/u energy is presented. A 10J//XS CO 2 laser has been used to produce a hot plasma plume, emitting highly charged tantulum ions. The correct geometry and potential distribution of the matching section has been designed in accordance with the results of computer simulations by using the AXCEL code. Measurements of the charge state distribution of the accelerated beam indicate that it contains about 70% Ta 10+ and 30% Ta 11+ ions.
A status overview of the development of laser ion sources suited to heavy ion synchrotrons is presented. The results of experimental and theoretical studies, recently obtained at a number of laboratories, for laser-produced highly charged heavy ions are summarized for plasmas heated by long wavelength lasers. Design of a powerful repetition rate CO2 laser, target interaction chamber, and extraction system suited for reliable long term operation mode with real accelerators is discussed. Requirements for the final performance of the laser ion sources for ion beam injectors at the ITEP-Moscow and CERN accelerator facilities are given.
Articles you may be interested inPhysics research and technology developments of electron string ion sourcesa) Rev. Sci. Instrum. 83, 02A512 (2012); 10.1063/1.3678660 H − source developments at CERN Rev. Sci. Instrum. 77, 03A521 (2006);The high current, high charge-state ion beam which can be extracted from a laser produced plasma is well suited, after initial acceleration, for injection into synchrotrons. At CERN, the production of a heavy ion beam using a CO 2 laser ion source is studied. The latest results of experiments with a tantalum ion beam with charge states up to 23ϩ and accelerated by a radio frequency quadrupole from 6.9 to 100 keV/u, are presented along with simulations of the low energy beam transport. The ion yield at the desired charge state, the pulse to pulse stability of the ion beam, and the system reliability are all of major interest. Work is under way to replace the low repetition rate free-running laser oscillator by a master oscillator and power amplifier system. The master oscillator is operational and the first results of measurements of its beam quality and stability are presented.
Operation of the laser ion source of He-like light ions designed for the first stage of the ITEP Terra Watt Accumulator ͑TWAC͒ project is discussed. A 5 J/0.5 Hz rep-rate CO 2 laser was used for generation of highly charged light ions. The absolute number of ions with different charge states for carbon and aluminum ion beams has been measured. The obtained number of C ϩ4 ions (ϳ10 11 ions/pulse) is sufficient to start the experimental proof of the accelerator scheme of the TWAC project. The investigation of shot to shot stability indicates significant increasing ͑ϳ2-3 times͒ of highly charged ion yield for the first shot onto the fresh target surface with respect to the next shots onto the same spot of aluminum target. This effect was not observed for the carbon target. Experimental results for highly charged light and medium mass ͑F, Mg, Al, Ca, Ti͒ ions produced by of 75 J single pulse CO 2 laser consisting of a master oscillator and power amplifier are also presented.
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