The TRIUMF Resonant Ionization Laser Ion Source is the first RILIS to use all solid state lasers on-line for radioactive ion beam delivery. It operates tuneable, pulsed Titanium:Sapphire lasers, pumped by a frequency-doubled, diode pumped Nd:YAG laser. This laser light can also be frequency doubled, tripled and quadrupled with few percent tripling and quadrupling efficiency. The Ti:Sa laser parameters are:
ultra stable TiSa
rep. rate: 10 kHz
pulse length: 40 ns
tuning range: (670-990)nm
continuously tuneable TiSa
optional tracked frequency doubing
TiSa RILIS elements
isotopes from 40 elements on-line delivered with TiSa lasers
isobar free RILIS:
ion guide - laser ion source (IG-LIS) successful operation: SiC target (04/2013), UCx target (12/2013)
-> ITE/TM4 operation only // excellent suppression; continued development e.g. efficiency (2014)
In addition either 12W of Nd:YAG laser fundamental wavelength, or 6W of frequency doubled light are available for non-resonant ionization if needed.
From the cartoon of the TRIUMF RILIS it becomes obvious that laser beam transport plays an important role in the operation of an efficient RILIS. The on-line laser laboratory is located approx. 20 m from the isotope production target-ion source. Since 04/2011 T RILIS can be operated in both the ISAC west and east target stations, thus allowing for full flexibility in beam delivery.
A major advantage for a RILIS source at a RIB facility is that the laser systems are accessible during RIB production in contrast to classical ion sources, which by nature of being closely coupled to the isotope production target become irradiated and must be discarded after use, together with the target. This in comparison makes an on-line RILIS an economic and versatile ion source.