Plans for laser spectroscopy of trapped cold hydrogen-like HCI

Winters, D.; Abdulla, A. M.; Pita, J. R. Castrejón; Lange, A. de; Segal, D. M.; Thompson, R. C.

doi:10.1016/j.nimb.2005.03.173

Cited by 9 publications

(5 citation statements)

References 19 publications

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“…In an effort to check the validity of the results of the calculation, the influence of space charge has been studied using SIMION, which allows for charged particle tracking in static electric and magnetic fields created in a user-defined geometry. The simulations have been performed for hydrogen-like lead ions [20,21] (m = 207 u and q = 81) confined in a cylindrical open endcap Penning trap [19]. The ion cloud is simulated by a cubic array, typically of size 5 × 5 × 5, in which a charge of magnitude e is assigned to each array point.…”

Section: Simulations Of the Space Charge Shiftmentioning

confidence: 99%

Electronic detection of charged particle effects in a Penning trap

Winters¹,

Vogel²,

Segal³

et al. 2006

J. Phys. B: At. Mol. Opt. Phys.

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We present a thorough analysis of the electronic detection of charged particles, confined in a Penning trap, via image charges induced in the trap electrodes. Trapping of charged particles in an electrode structure leads to frequency shifts, which are due to image charge and space charge effects. These effects are of importance for Penning trap experiments which involve high charge densities or require high precision in the motional frequencies. Our analysis of image charges shows that only (higher order) odd powers of the particle displacement lead to induced charge differences, giving rise to a signal. This implies that, besides the centre-of-mass frequency of a trapped particle cloud, also higher order individual particle frequencies induce a signal, which can be picked up by an electronic detection circuit attached to the trap electrodes. We also derive analytic expressions for the image charge and space charge induced frequency shifts and perform simulations of space charge effects. In relation to this, we discuss the consequences of the shifted particle frequencies for resistive cooling of the particle motion.

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Section: Simulations Of the Space Charge Shiftmentioning

confidence: 99%

Electronic detection of charged particle effects in a Penning trap

Winters¹,

Vogel²,

Segal³

et al. 2006

J. Phys. B: At. Mol. Opt. Phys.

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“…From relation (5), the corresponding beam waist in the middle of the crystal for the optimum ξ = 1.39 is approximately 16 μm. Due to the astigmatism introduced by the concave spherical mirrors, crystal faces and crystal axis, it is impossible to design a simple cavity which facilitates the focusing of the laser to a round waist inside the crystal.…”

Section: Design Of the Second Shg Cavitymentioning

confidence: 99%

“…For example, spectroscopy experiments are planned at the GSI Helmholtz Center for Heavy Ion Research to measure the ground state hyperfine splitting in HCI [5]: this splitting increases roughly proportional to Z 3 and was previously measured to amount to 243,87(4) nm in 209 Bi 82+ [6]. This splitting was measured on a relativistic ion beam at the Experimental Storage Ring (ESR) at GSI and the accuracy was limited by the residual Doppler broadening of the ion beam after electron cooling.…”

mentioning

confidence: 99%

Towards sympathetic cooling of trapped ions with laser-cooled Mg + ions for mass spectrometry and laser spectroscopy

et al. 2010

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Sympathetic cooling by laser cooled Mg ions has been proposed as a method for fast cooling of highly charged ions to a very low temperature. The paper describes the construction of the solid state laser system at 279.63 nm required for laser cooling of the Mg ions. The laser system is composed of a fiber laser at 1,118.54 nm and two successive second harmonic generation (SHG) ring cavities for frequency quadrupling. In the first SHG cavity, non-critical phase matching of a lithium triborate (LBO) crystal is used for doubling from 1,118.54 to 559.27 nm. The second SHG cavity uses critical phase matching of a β-barium borate (BBO) crystal for doubling from 559.27 to 279.63 nm. With the aid of Boyd-Kleinmann theory, optimum experimental parameters are calculated and used for an efficient SHG. Besides this, the paper intends to be a shortcut for practical applications of the Boyd-Kleinmann theory for SHG.

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“…A detailed description of the proposed experiments, as well as a treatment of the techniques used, can be found elsewhere [18,19]. Briefly, an externally produced bunch of roughly 10 5 HCI at an energy of a few keV is loaded into a cylindrical open-endcap Penning trap [20] on axis, i.e., along the magnetic field lines.…”

Section: Experiments Overviewmentioning

confidence: 99%

“…The above mentioned transition lifetimes imply that, for a detection efficiency of ∼ 10 −3 , acceptable fluorescence rates, up to a few thousand counts per second, from M 1 transitions can be expected from a (∼ 3 mm diameter) cloud of 10 5 ions [18,19]. Confining the HCI in a trap, and cooling and compressing the cloud, will thus enable fluorescence detection and ensure long interrogation times by the laser.…”

Section: Experiments Overviewmentioning

confidence: 99%

Laser spectroscopy of hyperfine structure in highly charged ions: a test of QED at high fields

Winters¹,

Vogel²,

Segal³

et al. 2007

Can. J. Phys.

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An overview is presented of laser spectroscopy experiments with cold, trapped, highly charged ions, which will be performed at the HITRAP facility at GSI in Darmstadt (Germany). These high-resolution measurements of ground-state hyperfine splittings will be three orders of magnitude more precise than previous measurements. Moreover, from a comparison of measurements of the hyperfine splittings in hydrogen-like and lithium-like ions of the same isotope, QED effects at high electromagnetic fields can be determined within a few percent. Several candidate ions suited for these laser spectroscopy studies are presented.Résumé : Nous présentons les expériences de spectroscopie avec des ions froids, captifs et hautement chargés qui seront poursuivies au laboratoire HITRAP au GSI de Darmstadt (Allemagne). Ces mesures de haute résolution de la séparation hyperfine du fondamental seront plus précises par trois ordres de grandeur que les mesures antérieures. Il sera également possible de déterminer à faible pourcentage d'erreur les effets QED en champ intense, suite à la comparaison des mesures de séparation hyperfine d'ions de même isotope de type hydrogène et lithium. Nous présentons des ions qui seraient de bons choix pour ces études de spectroscopie laser.[Traduit par la Rédaction]

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Plans for laser spectroscopy of trapped cold hydrogen-like HCI

Cited by 9 publications

References 19 publications

Electronic detection of charged particle effects in a Penning trap

Electronic detection of charged particle effects in a Penning trap

Towards sympathetic cooling of trapped ions with laser-cooled Mg + ions for mass spectrometry and laser spectroscopy

Laser spectroscopy of hyperfine structure in highly charged ions: a test of QED at high fields

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