학술논문
The Genesis Solar Wind Concentrator Target: Mass Fractionation Characterised by Neon Isotopes.
Document Type
Article
Author
Source
Subject
*SOLAR wind
*NEON
*ISOTOPES
*LASER ablation
*NOBLE gases
*ASTROPHYSICS
*SPACE research
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Language
ISSN
0038-6308
Abstract
The concentrator on Genesis provided samples of increased fluences of solar wind ions for precise determination of the oxygen isotopic composition. The concentration process caused mass fractionation as a function of the radial target position. This fractionation was measured using Ne released by UV laser ablation and compared with modelled Ne data, obtained from ion-trajectory simulations. Measured data show that the concentrator performed as expected and indicate a radially symmetric concentration process. Measured concentration factors are up to ∼30 at the target centre. The total range of isotopic fractionation along the target radius is 3.8%/amu, with monotonically decreasing 20Ne/22Ne towards the centre, which differs from model predictions. We discuss potential reasons and propose future attempts to overcome these disagreements. [ABSTRACT FROM AUTHOR]