Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2008-06-06
Nucl.Instrum.Meth.B266:4794-4807,2008
Physics
Nuclear Physics
Nuclear Experiment
Latex formatted, submitted to NIM B, 17 pages with 22 .eps figures
Scientific paper
10.1016/j.nimb.2008.07.022
The laser ion source project at the IGISOL facility, Jyvaskyla, has motivated the development and construction of an rf sextupole ion beam guide (SPIG) to replace the original skimmer electrode. The SPIG has been tested both off-line and on-line in proton-induced fission, light-ion and heavy-ion induced fusion-evaporation reactions and, in each case, has been directly compared to the skimmer system. For both fission and light-ion induced fusion, the SPIG has improved the mass-separated ion yields by a factor of typically 4 to 8. Correspondingly, the transmission efficiency of both systems has been studied in simulations with and without space charge effects. The transport capacity of the SPIG has been experimentally determined to be 10^12 ions/s before space charge effects start to take effect. A direct comparison with the simulation has been made using data obtained via light-ion fusion evaporation. Both experiment and simulation show an encouraging agreement as a function of current extracted from the ion guide.
Äystö Juha
Karvonen P.
Kessler Thomas
Moore I. D.
Penttila H.
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