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Gas jet studies towards an optimization of the IGISOL LIST method

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Title: Gas jet studies towards an optimization of the IGISOL LIST method
Authors: Reponen, M.1, Moore, I.D.1 iain.d.moore@jyu.fi, Pohjalainen, I.1, Kessler, T.1, Karvonen, P.1, Kurpeta, J.2, Marsh, B.3, Piszczek, S.2, Sonnenschein, V.1, Äystö, J.1
Source: Nuclear Instruments & Methods in Physics Research Section A. Apr2011, Vol. 635 Issue 1, p24-34. 11p.
Subjects: Gas flow, Nozzles, Laser beams, Computational fluid dynamics, Simulation methods & models, Jets (Fluid dynamics), Mathematical optimization
Abstract: Abstract: Gas jets emitted from an ion guide have been studied as a function of nozzle type and gas cell-to-background pressure ratio in order to obtain a low divergent, uniform jet over a distance of several cm. The jet has been probed by imaging the light emitted from excited argon or helium gas atoms. For a simple exit hole or converging-diverging nozzle, the jet diameter was found to be insensitive to the nozzle shape and inlet pressure. Sonic jets with a FWHM below 6mm were achieved with a background pressure larger than 1mbar in the expansion chamber. The measurements are supported by the detection of radioactive recoils from an alpha recoil source mounted within the gas cell. A Laval nozzle produced a well-collimated supersonic jet at low background pressures with a FWHM of over a distance of 14cm. Direct Pitot probe measurements, on-axis, revealed a non-uniform pressure distribution in the gas jet of the Laval nozzle, supporting the visual observations. All measurements are motivated by the requirement of a good geometrical overlap between atoms and counter-propagating laser beams in the gas cell-based Laser Ion Source Trap (LIST) project. Computational fluid dynamics gas flow simulations were initiated to guide the future development of the gas jet system. [Copyright &y& Elsevier]
Copyright of Nuclear Instruments & Methods in Physics Research Section A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 59169164
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Gas jet studies towards an optimization of the IGISOL LIST method
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  Data: <searchLink fieldCode="AR" term="%22Reponen%2C+M%2E%22">Reponen, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Moore%2C+I%2ED%2E%22">Moore, I.D.</searchLink><relatesTo>1</relatesTo><i> iain.d.moore@jyu.fi</i><br /><searchLink fieldCode="AR" term="%22Pohjalainen%2C+I%2E%22">Pohjalainen, I.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kessler%2C+T%2E%22">Kessler, T.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Karvonen%2C+P%2E%22">Karvonen, P.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kurpeta%2C+J%2E%22">Kurpeta, J.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Marsh%2C+B%2E%22">Marsh, B.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Piszczek%2C+S%2E%22">Piszczek, S.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Sonnenschein%2C+V%2E%22">Sonnenschein, V.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Äystö%2C+J%2E%22">Äystö, J.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Nuclear+Instruments+%26+Methods+in+Physics+Research+Section+A%22">Nuclear Instruments & Methods in Physics Research Section A</searchLink>. Apr2011, Vol. 635 Issue 1, p24-34. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Gas+flow%22">Gas flow</searchLink><br /><searchLink fieldCode="DE" term="%22Nozzles%22">Nozzles</searchLink><br /><searchLink fieldCode="DE" term="%22Laser+beams%22">Laser beams</searchLink><br /><searchLink fieldCode="DE" term="%22Computational+fluid+dynamics%22">Computational fluid dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Simulation+methods+%26+models%22">Simulation methods & models</searchLink><br /><searchLink fieldCode="DE" term="%22Jets+%28Fluid+dynamics%29%22">Jets (Fluid dynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Mathematical+optimization%22">Mathematical optimization</searchLink>
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  Data: Abstract: Gas jets emitted from an ion guide have been studied as a function of nozzle type and gas cell-to-background pressure ratio in order to obtain a low divergent, uniform jet over a distance of several cm. The jet has been probed by imaging the light emitted from excited argon or helium gas atoms. For a simple exit hole or converging-diverging nozzle, the jet diameter was found to be insensitive to the nozzle shape and inlet pressure. Sonic jets with a FWHM below 6mm were achieved with a background pressure larger than 1mbar in the expansion chamber. The measurements are supported by the detection of radioactive recoils from an alpha recoil source mounted within the gas cell. A Laval nozzle produced a well-collimated supersonic jet at low background pressures with a FWHM of over a distance of 14cm. Direct Pitot probe measurements, on-axis, revealed a non-uniform pressure distribution in the gas jet of the Laval nozzle, supporting the visual observations. All measurements are motivated by the requirement of a good geometrical overlap between atoms and counter-propagating laser beams in the gas cell-based Laser Ion Source Trap (LIST) project. Computational fluid dynamics gas flow simulations were initiated to guide the future development of the gas jet system. [Copyright &y& Elsevier]
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  Data: <i>Copyright of Nuclear Instruments & Methods in Physics Research Section A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.nima.2011.01.125
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      – SubjectFull: Laser beams
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      – SubjectFull: Mathematical optimization
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