Atomic physics experiments with trapped and cooled highly charged ions

Kluge, H.‐J.; Quint, W.; Winters, D.

doi:10.1088/1742-6596/58/1/002

Cited by 8 publications

(6 citation statements)

References 43 publications

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“…The CRYRING [49] in combination with the ESR will provide very heavy highly-charged ions at energies down to 0.1 MeV u −1 . In the HITRAP ion trap [50,51], heavy highly-charged ions will be stored and cooled to rest, thus providing a source for Dopplerfree spectroscopy on very heavy ions [52].…”

Section: Discussionmentioning

confidence: 99%

Precise determination of the 1s Lamb shift in hydrogen-like lead and gold using microcalorimeters

Kraft‐Bermuth

Andrianov

Bleile

et al. 2017

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

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Quantum electrodynamics in very strong Coulomb fields is one scope which has not yet been tested experimentally with sufficient accuracy to really determine whether the perturbative approach is valid. One sensitive test is the determination of the 1s Lamb shift in highly-charged very heavy ions. The 1s Lamb shift of hydrogen-like lead (Pb 81+ ) and gold (Au 78+ ) has been determined using the novel detector concept of silicon microcalorimeters for the detection of hard x-rays. The results of  260 53 ( ) eV for lead and  211 42 () eV for gold are within the error bars in good agreement with theoretical predictions. To our knowledge, for hydrogen-like lead, this represents the most accurate determination of the 1s Lamb shift.

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Section: Discussionmentioning

confidence: 99%

Precise determination of the 1s Lamb shift in hydrogen-like lead and gold using microcalorimeters

Kraft‐Bermuth

Andrianov

Bleile

et al. 2017

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

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“…Unfortunately, despite the excellent vacuum in this storage ring, the lifetime of very heavy ions becomes very small at such low ion energies. At GSI, the low-energy storage ring CRYRING [20,90] as well as the heavy ion trap facility HITRAP [21,22] are currently under commissioning to solve this problem and realize the storage of heavy ions down to below 1 MeV/u at the CRYRING and of ions practically at rest in the HITRAP. When combining these facilities with the excellent performance of microcalorimeters, a considerable improvement of the accuracy for the Lamb Shift and other X-ray spectroscopy experiments can be expected.…”

Section: Discussionmentioning

confidence: 99%

“…The 1s Lamb Shift of hydrogen-like uranium was determined at the ESR electron cooler by Gumberidze et al with an accuracy of 1% [19]. Presently, the experimental storage facilities at GSI are extended by the installation of the CRYRING, a second storage ring which operates at energies down to ≤300 keV/u [20], and the installation of the HITRAP facility where the ions will be captured in a Penning trap and cooled to ion temperatures of about 4 K [21,22]. These three facilities will be connected, thus providing a versatile experimental area not only for stable ions, but-in connection with the fragment separator FRS [23]-also for unstable nuclides.…”

Section: Introductionmentioning

confidence: 99%

“…In the CRYRING, the ions may be stored and cooled at a maximum energy of 14 MeV/u or further decelerated. From the CRYRING, a transfer beam line leads to the HITRAP facility [21,22] where the ions are loaded into a Penning trap and cooled to a kinetic energy corresponding to about 4 K. On the high-energy side, stable and unstable nuclides will be injected into the High Energy Storage Ring (HESR) at the FAIR facility [25]. All storage facilities are or will be equipped with several experimental installations, including a transverse gas-jet target and a facility for laser spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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Microcalorimeters for X-Ray Spectroscopy of Highly Charged Ions at Storage Rings

Kraft‐Bermuth

Hengstler

Egelhof

et al. 2018

Atoms

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X-ray spectroscopy of highly charged heavy ions is an important tool for the investigation of many topics in atomic physics. Such highly charged ions, in particular hydrogen-like uranium, are investigated at heavy ion storage rings, where high charge states can be produced in large quantities, stored for long times and cooled to low momentum spread of the ion beam. One prominent example is the determination of the 1s Lamb Shift in hydrogen-like heavy ions, which has been investigated at the Experimental Storage Ring (ESR) at the GSI Helmholtz Centre for Heavy Ion Research. Due to the large electron binding energies, the energies of the corresponding photon transitions are located in the X-ray regime. To determine the transition energies with high accuracy, highly resolving X-ray spectrometers are needed. One concept of such spectrometers is the concept of microcalorimeters, which, in contrast to semiconductor detectors, uses the detection of heat rather than charge to detect energy. Such detectors have been developed and successfully applied in experiments at the ESR. For experiments at the Facility for Antiproton and Ion Research (FAIR), the Stored Particles and Atoms Collaboration (SPARC) pursues the development of new microcalorimeter concepts and larger detector arrays. Next to fundamental investigations on quantum electrodynamics such as the 1s Lamb Shift or electron–electron interactions in two- and three-electron systems, X-ray spectroscopy may be extended towards nuclear physics investigations like the determination of nuclear charge radii.

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“…In recent years, the loss of electrons from heavy projectiles in fast collisions with neutral target atoms has attracted a great deal of interest because of its importance for the design of new heavy-ion accelerators and storage rings [1][2][3]. In such rings, any ionization or capture of electrons by the projectiles typically leads to a loss of the ions from the beam, thus limiting the intensities that are to be obtained eventually.…”

Section: Introductionmentioning

confidence: 99%

Electron loss of fast heavy projectiles in collision with neutral targets

Matveev¹,

Ryabchenko²,

Matrasulov³

et al. 2009

Phys. Rev. A

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The multiple electron loss of heavy projectiles in fast ion-atom collisions has been studied in the framework of the sudden perturbation approximation. Especially, a model is developed to calculate the cross sections for the loss of any number of electrons from the projectile ion, including the ionization of a single electron and up to the complete stripping of the projectile. For a given collision system, that is specified by the (type and charge state of the) projectile and target as well as the collision energy, in fact, the experimental cross sections for just three final states of the projectile are required by this model in order to predict the loss of any number, N , of electrons for the same collision system, or for any similar system that differs only in the energy or the initial charge state of the projectile ion. The model is simple and can be utilized for both, the projectile and target ionization, and without that large computer resources are requested. Detailed computation have been carried out for the multiple electron loss of Xe 18+ and U 6+, 10+, 28+ projectiles in collision with neutral Ar and Ne gas targets.

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Atomic physics experiments with trapped and cooled highly charged ions

Cited by 8 publications

References 43 publications

Precise determination of the 1s Lamb shift in hydrogen-like lead and gold using microcalorimeters

Precise determination of the 1s Lamb shift in hydrogen-like lead and gold using microcalorimeters

Microcalorimeters for X-Ray Spectroscopy of Highly Charged Ions at Storage Rings

Electron loss of fast heavy projectiles in collision with neutral targets

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