Dr Ruohong Li (I) Dr Serge Franchoo (Universite de Paris-Sud 11 (FR))
The Resonant Ionization Laser Ion Source (RILIS) is an element selective, highly efficient and versatile tool to generate pure radioactive isotope beams at Isotope Separators on-line (ISOL) facilities. The laser ion source at ALTO consists of a dye laser system at 10 kHz pumped with a 532 nm Nd:Yag laser. ALTO RILIS was successfully put into its first operation in 2011. The 79Ga isotope was resonantly ionized with a 287-532 nm scheme and an enhancement factor of 15 was observed, compared to surface ionization with a tantalum cavity. Recently two new commercial grating tuned high repetition dye lasers have been procured and installed. Each dye laser has a laser resonator, a power amplifier and a single-pass doubling unit. The typical power of the lasers, for a pumping power of ~30 W, is ~8 W after the amplifier and ~ 500 mW after frequency doubling with a convention efficiency of ~6%. The pulse width of the lasers is ~10 ns and the linewidth is ~3 GHz. The on-line laser ionization of Ga with the new dye laser system was then repeated in Nov 2012 with a 287/294-532 nm scheme. Meanwhile to support on-line RILIS operation, the design and the building of an off-line reference cell are in process.
Dr Ruohong Li (I)
Dr Serge Franchoo (Universite de Paris-Sud 11 (FR))