Focusing ions by viscous drag and weak electric fields in an ion guide

Iivonen, A.; Riikonen, Kari-Pekka; Saintola, R.; Valli, K.; Morita, Kosuke

doi:10.1016/0168-9002(91)90132-a

Cited by 12 publications

(1 citation statement)

References 4 publications

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“…One of the more important parameters in the model that has not been measured directly is that of the pressure between the ion guide, the skimmer/SPIG device and the extraction electrode. In principle measurements of the pressure distributions could be made in the future using thin static and stagnation pressure probes as previously discussed by Iivonen et al [32].…”

Section: Discussionmentioning

confidence: 99%

A sextupole ion beam guide to improve the efficiency and beam quality at IGISOL

Karvonen

Moore

Sonoda

et al. 2008

Nuclear Instruments and Methods in Physics Research Section B:

133

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The laser ion source project at the IGISOL facility, Jyväskylä, 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 protoninduced 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 −1 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.

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Section: Discussionmentioning

confidence: 99%

A sextupole ion beam guide to improve the efficiency and beam quality at IGISOL

Karvonen

Moore

Sonoda

et al. 2008

Nuclear Instruments and Methods in Physics Research Section B:

133

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The IGISOL technique—three decades of developments

Moore

Dendooven

Ärje

2013

Three Decades of Research Using IGISOL Technique at the University of Jyväskylä

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Collinear fast atomic-beam laser spectroscopy at riken garis/igisol

et al. 1992

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The nuclei close to the N = 104 show an interesting feature. Extremely large shape staggering in the isotope and isomer shifts was observed for Hg and TI isotopes , and shape coexistence at low excitation energy was observed for Hg, Au, and Pt isotopes. It should also be noted that many high-spin isomers exist in the nuclei of this region, such as Hf, Wand Os. For many elements in this region, however, laser spectroscopy has not been reported, because these elements are refractory ones. At R1KEN, we have constructed an 1SOL system GAR1S/1GISOL which is powerful to extract radioactive isotopes of refractory elements. Taking full advantages of this feature, we aim at performing collinear laser spectroscopy to study exotic nuclei of these elements. To make on-line collinear laser spectroscopy, the radioactive beams from the GARIS/IGISOL is required to have adequate quality (velocity spread) and quantity. Therefore, direct measurement of the velocity spread of Ar 1 + ion beams from the IGISOL was carried out with a technique of laser spectroscopy. The skimmer-potential and the gas-cell pressure dependences of the velocity spread were systematically investigated. A new focusing device SQUEEZER was introduced to reduce the velocity spread, and the effect of this was experimentally examined. From these measurements, it was pointed" out that the ion beam from the GARIS/IGISOL has adequate quality for making collinear laser spectroscopy. An estimation of the yield of radioactive isotopes from the GARIS/IGISOL was also made for a fusion reaction 9 Be(166 Er, xn)175-X H f. The estimated yield was expected to be more than 10 4 particles/so The yield of the radioactive isotope is adequate to make collinear laser spectroscopy with a coincidence method. We have for the first time in the world extracted the radioactive isotope of refractory element 169Hf with the GAR1S/1G1SOL. We conclude, thus, that the collinear laser spectroscopy of refractory elements with the GARIS/IGISOL is promising.

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Focusing ions by viscous drag and weak electric fields in an ion guide

Cited by 12 publications

References 4 publications

A sextupole ion beam guide to improve the efficiency and beam quality at IGISOL

A sextupole ion beam guide to improve the efficiency and beam quality at IGISOL

The IGISOL technique—three decades of developments

Collinear fast atomic-beam laser spectroscopy at riken garis/igisol

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