Birkl, G.

Martin, A.

Quint, W.

Vogel, M.

von Lindenfels, D.

Wiesel, M.

GSI Repository

In-trap production of highly charged ions at ARTEMISM. Vogel1,2, G. Birkl1, D. von Lindenfels2,3, A. Martin1, W. Quint2,3, and M. Wiesel1,2,31Institut fu¨r Angewandte Physik, TU Darmstadt; 2GSI, Darmstadt; 3Ruprecht Karls-Universita¨t HeidelbergWe are currently setting up a laser-microwave double-resonance spectroscopy experiment with highly chargedions in a Penning trap, which combines precise spec-troscopy both of optical transitions and microwave Zeemansplittings [1, 2, 3]. The experiment aims at spectroscopicprecision measurements of such energy level splittings andmagnetic moments of bound electrons on the ppb level ofaccuracy and better. For first tests, the 40Ar13+ ion hasbeen chosen. It has a spinless nucleus, such that only afine structure is present. Similar measurements in hyperfinestructures are to be performed with ions of higher chargestates such as for example 207Pb81+ and 209Bi82+ as avail-able to ARTEMIS within the framework of the HITRAPfacility.Figure 1: Photography of the ARTEMIS Penning trap, inwhich the ions are created and confined for spectroscopy.In an external magnetic field, the Zeeman effect lifts thedegeneracy of energies within fine- and hyperfine-structurelevels. For highly charged ions in magnetic fields of afew Tesla strength, the Zeeman splitting is well withinthe microwave domain and thus accessible for precisionspectroscopy. In addition, in case of fine- and hyperfine-structure transitions, the strong scaling with Z eventuallyshifts the corresponding energies into the laser-accessibleregion and thus makes them available for precision opti-cal spectroscopy [1]. Figure 1 shows the Penning trap ofthe ARTEMIS experiment, in which the ions of interestare created and confined for spectroscopy. Creation takesplace by electron impact ionization in close similarity tothe charge breeding processes used in electron beam ionsources (EBIS). We have installed this trap arrangement inthe superconducting magnet of the ARTEMIS experiment,and have used an EMCCD-camera to detect photons emit-ted during the charge breeding process of highly-chargedargon ions. Figure 2 shows a false-colour image from thiscamera looking into the cylindrical trap along its symmetryaxis from above. This optical tracking of the ion creationFigure 2: EMCCD-image of photons emitted during cre-ation of highly-charged ions in the trap.process is a powerful diagnostic tool to control and opti-mize the charge breeding process in real-time. In a nextstep, it will be combined with non-destructive electronicdetection able to yield mass spectra of produced ion disti-butions, thus providing optimal control.This work has been supported in part by DFG (GrantsVO 1707/1-2 and BI 647/4-1), by GSI, HGS-HiRe, and bythe IMPRS for Quantum Dynamics Heidelberg.References[1] W. Quint, D. Moskovkin, V.M. Shabaev and M. Vogel, Phys.Rev. A 78 (2008) 032517.[2] D. von Lindenfels, N. Brantjes, G. Birkl, W. Quint, V.Shabaev and M. Vogel, Can. J. Phys. 89, 79 (2011).[3] D. von Lindenfels, G. Birkl, D.A. Glazov, A. Martin, G.Plunien, W. Quint, V.M. Shabaev, M.M. Sokolov, M. Vo-gel, A.V. Volotka, and M. Wiesel, Phys. Rev. A 87 023412(2013).PNI-AP-15 GSI SCIENTIFIC REPORT 2013172 doi:10.15120/GR-2014-1-PNI-AP-15

In-trap production of highly charged ions at ARTEMIS

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In-trap production of highly charged ions at ARTEMIS

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