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首页> 外文期刊>Earth, planets and space: EPS >A novel particle source based on electrospray charging for dust accelerators and its significance for cosmic dust studies
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A novel particle source based on electrospray charging for dust accelerators and its significance for cosmic dust studies

机译：一种基于电喷雾充电的新型粉尘促进剂粒子源及其对宇宙粉尘研究的意义

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In situ cosmic dust analyzers, like those aboard Cassini, Galileo, and Stardust, provide important data about cosmic dust, including the chemical composition of dust particles. Correctly interpreting the data from these cosmic dust analyzers requires laboratory calibration experiments. By studying the impact mass spectrum from a particle of known composition, an unknown particle's composition can be inferred from its impact mass spectrum measured in situ. This work expands a recently presented method, electrospray charging, introduced as a means of charging minerals, astrophysical ices, and mineral-ice mixtures that are not electrically conductive. This overcomes a limitation of current dust accelerators: they can only charge, and therefore accelerate, electrically conductive particles. This paper presents experiments demonstrating that microparticles (typically 2 micrometers) of olivine, a common mineral in meteorites, and of an ordinary chondrite (Allan Hills A 79045) can be electrically charged even though neither is electrically conductive. This article discusses the acceleration potential of electrospray-charged projectiles, and explores ways to overcome the challenges implicit in coupling an electrospray source to a dust accelerator. Electrospray charging may enable experiments with novel projectiles that are better analogues for cosmic dust than the conductive projectiles currently in use. Theoretical charging limits using this technique would allow micron-sized particles to be accelerated to several km/s using 3 MV potential, with higher velocities for smaller particles.
机译：诸如卡西尼号，伽利略号和星尘号等原位的宇宙尘埃分析仪可提供有关宇宙尘埃的重要数据，包括尘埃颗粒的化学成分。正确解释这些宇宙尘埃分析仪的数据需要实验室校准实验。通过研究已知成分颗粒的冲击质谱，可以从现场测量的未知质谱推断未知颗粒的成分。这项工作扩展了最近提出的一种方法，即电喷雾充电，这种方法是作为一种对不导电的矿物质，天体冰以及矿物冰混合物进行充电的方法而引入的。这克服了目前的粉尘加速器的局限性：它们只能充电，因此可以加速导电颗粒。本文提出的实验表明，即使陨石中的常见矿物橄榄石和普通球粒陨石（Allan Hills A 79045）的微粒（通常为2微米）也可以带电，即使它们都不导电。本文讨论了带电喷雾弹丸的加速潜力，并探讨了克服将电喷雾源耦合到粉尘加速器所隐含挑战的方法。电喷雾充电可以使新型弹丸的实验成为可能，它比目前使用的导电弹丸更适合宇宙尘埃。使用该技术的理论充电极限将允许使用3 MV电位将微米级颗粒加速到几公里/秒，对于较小的颗粒则具有较高的速度。

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