Paulus, G.

Quint, W.

Stöhlker, T.

Vogel, M.

GSI Repository

The HILITE Penning trap and first tests at the HILITE setupM. Vogel1,2, W. Quint2,3, G. Paulus4, and Th. Sto¨hlker2,4,51TU Darmstadt; 2GSI, Darmstadt; 3Ruprecht Karls-Universita¨t Heidelberg; 4Universita¨t Jena; 5Helmholtz-Institut JenaWe have built a dedicated Penning trap for preparationand control of suitable ion targets for irradiation with high-intensity laser light and study of subsequent reactions, de-picted in figure 1. Of particular interest is the detailedinvestigation of multiphoton-ionisation of confined parti-cles by highly intense laser light. One important aspectis control over the confined particles’ mass, charge, den-sity, localization and optimized overlap with the laser lightby Penning trap techniques like the use of trap electrodesas ’electrostatic tweezers’ and by application of a ’rotatingwall’, respectively [1]. Also, the non-destructive detectionof reaction products is a central property. The Penning trapsetup is designed in a portable fashion, such that it can beattached to existing laser systems easily, see figure 2.The interaction of highly intense radiation with matterand the corresponding non-linear effects have been subjectof lively research, both theoretical and experimental, es-pecially in the infrared and visible photon energy regimes.Laser systems capable of producing high intensities alsoat photon energies in the extreme ultra-violet (EUV) and(soft) X-ray regime open access to novel effects like non-linear Compton effects or simultaneous elastic and inelasticphoton scattering, and allow multiphoton-ionisation exper-iments in a new domain. However, experiments have so farnot been able to prepare and investigate well-defined parti-cle ensembles and to non-destructively analyse the reactionproducts with high accuracy, nor were they able to select orprepare products for further studies in a well-defined way.Figure 1: Photography of the HILITE Penning trap. Thefunction of the individual electrodes is indicated, sepa-ration between electrodes is achieved by Sapphire rings(milky white).The particles (atomic or molecular ions) are confinedin the Penning trap following in-trap production or cap-ture of externally produced ions. Confined ions can becooled, compressed, positioned and selected with respectto their mass and charge prior to laser irradiation. The reac-tion products are analysed by non-destructive methods andhence remain confined for further studies. Such measure-ments are, for example, able to determine cross sections formultiphoton-ionisation in an energy- and intensity- regimeso far not or not sufficiently examined. Additionally, thecreated electrons may be extracted from the trap and anal-ysed externally. Hence, the reaction energetics may be re-constructed as completely as possible.Figure 2: Photography of the HILITE superconductingmagnet setup. The Penning trap from figure 1 will be in-stalled in the centre of the magnet bore.By now, we have completed the vacuum system whichwill host the Penning trap inside the magnet bore and coolit to cryogenic temperatures using a two-stage cryocooler.The magnet has been operated at fields up to 6T and thevacuum system has successfully been tested to leak ratesbelow the 10−10 mbar l/s scale. We will now focus on theoperation and detection electronics as well as on connec-tivity to an external (EBIT) ion source for highly-chargedions.References[1] M. Vogel, W. Quint, Th. Sto¨hlker and G.G. Paulus, Nucl.Inst. Meth. B 285, 65 (2012).PNI-AP-13 GSI SCIENTIFIC REPORT 2013170 doi:10.15120/GR-2014-1-PNI-AP-13

The HILITE Penning trap and first tests at the HILITE setup

http://repository.gsi.de/record/67876/files/PNI-AP-13.pdf

The HILITE Penning trap and first tests at the HILITE setup

Abstract

Similar works

Full text

Available Versions

GSI Repository