F. Herfurth
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View article: Upgrades and maintenance of the CRYRING@ESR electron cooler for improved internal electron target operation
Upgrades and maintenance of the CRYRING@ESR electron cooler for improved internal electron target operation Open
The electron cooler of the CRYRING@ESR storage ring at the GSI-FAIR accelerator complex is a unique instrument, which not only provides beam cooling of the stored ions, but also serves as a low-energy electron target for Dielectronic Recom…
View article: Upgrades and maintenance of the CRYRING@ESR electron cooler for improved internal electron target operation
Upgrades and maintenance of the CRYRING@ESR electron cooler for improved internal electron target operation Open
The electron cooler of the CRYRING@ESR storage ring at the GSI-FAIR accelerator complex is a unique instrument, which not only provides beam cooling of the stored ions, but also serves as a low-energy electron target for Dielectronic Recom…
View article: A setup to study atomic state population dynamics and optical polarization at CRYRING@ESR
A setup to study atomic state population dynamics and optical polarization at CRYRING@ESR Open
We present a recently established setup for laser spectroscopy at CRYRING@ESR at the GSI Helmholtz Centre for Heavy Ion Research. Here, laser spectroscopy can be performed on stored and cooled ion bunches and coasting beams. First spectra …
View article: A Setup to Study Atomic State Population Dynamics and Optical Polarization at CRYRING@ESR
A Setup to Study Atomic State Population Dynamics and Optical Polarization at CRYRING@ESR Open
We present a recently established setup for laser spectroscopy at CRYRING@ESR at the GSI Helmholtz Centre for Heavy Ion Research. Here, laser spectroscopy can be performed on stored and cooled ion bunches and coasting beams. First spectra …
View article: Quantum Electrodynamics in Strong Electromagnetic Fields: Substate Resolved K$α$ Transition Energies in Helium-like Uranium
Quantum Electrodynamics in Strong Electromagnetic Fields: Substate Resolved K$α$ Transition Energies in Helium-like Uranium Open
Using novel metallic magnetic calorimeter detectors at the CRYRING@ESR, we recorded X-ray spectra of stored and electron cooled helium-like uranium (U$^{90+}$) with an unmatched spectral resolution of close to 90 eV. This allowed for an ac…
View article: Operational tests of CRYRING@ESR without electron cooler solenoid compensation
Operational tests of CRYRING@ESR without electron cooler solenoid compensation Open
We have tested operation of FAIR’s low-energy ion storage ring CRYRING@ESR with uncompensated electron cooler solenoid. With its standard working point on the lowest-order difference resonance, a second solenoid is normally used to cancel …
View article: Towards an Intrinsic Doppler Correction for X-ray Spectroscopy of Stored Ions at CRYRING@ESR
Towards an Intrinsic Doppler Correction for X-ray Spectroscopy of Stored Ions at CRYRING@ESR Open
We report on a new experimental approach for the Doppler correction of X-rays emitted by heavy ions, using novel metallic magnetic calorimeter detectors which uniquely combine a high spectral resolution with a broad bandwidth acceptance. T…
View article: Commissioning of the HITRAP Cooling Trap with Offline Ions
Commissioning of the HITRAP Cooling Trap with Offline Ions Open
Highly charged heavy ions at rest offer a wide spectrum of precision measurements. The GSI Helmholtzzentrum für Schwerionenforschung GmbH is able to deliver ions up to U92+. As the production of these heavy, highly charged ions requires hi…
View article: First Experiments with CRYRING@ESR
First Experiments with CRYRING@ESR Open
The low-energy heavy ion storage ring CRYRING was transported from Stockholm to Darmstadt, modernized and reconfigured, and recommissioned as CRYRING@ESR. The machine is now in operation with all installations in service and is available a…
View article: Recommissioning of the CRYRING@ESR Electron Cooler
Recommissioning of the CRYRING@ESR Electron Cooler Open
The heavy-ion storage ring CRYRING has been recommissioned downstream of GSI’s ESR, which it complements as dedicated low-energy machine. A key element of CRYRING@ESR is its electron cooler, which features one of the coldest electron beams…
View article: Ion Source Optimization Using Bi-Objective Genetic and Matrix-Profile Algorithm
Ion Source Optimization Using Bi-Objective Genetic and Matrix-Profile Algorithm Open
Employing the local ECR ion source of the FAIR phase 0 ion storage ring CRYRING@ESR, we set up an IT-environment for on-line data processing and applications based on the data available from beam diagnostic instruments and input signals co…
View article: Status of CRYRING@ESR and preparations for first experiments
Status of CRYRING@ESR and preparations for first experiments Open
Synopsis CRYRING was moved from Stockholm to Darmstadt, modernized and integrated into the GSI/FAIR beamline topology behind ESR. As CRYRING@ESR, it will receive and store heavy, highly charged ions from all species the present accelerator…
View article: Erratum: Nuclear deformation in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="bold-italic">A</mml:mi><mml:mo>≈</mml:mo><mml:mn mathvariant="bold-italic">100</mml:mn></mml:mrow></mml:math> region: Comparison between new masses and mean-field predictions [Phys. Rev. C <b>96</b>, 014310 (2017)]
Erratum: Nuclear deformation in the region: Comparison between new masses and mean-field predictions [Phys. Rev. C <b>96</b>, 014310 (2017)] Open
Received 17 April 2018DOI:https://doi.org/10.1103/PhysRevC.97.059902Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain a…
View article: Automatized Optimization of Beam Lines Using Evolutionary Algorithms
Automatized Optimization of Beam Lines Using Evolutionary Algorithms Open
Due to the massive parallel operation modes at the GSI accelerators, a lot of accelerator setup and re-adjustment has to be made during a beam time. This is typically done manually and is very time-consuming. With the FAIR project the comp…
View article: Commissioning of the Low Energy Storage Ring Facility CRYRING@ESR
Commissioning of the Low Energy Storage Ring Facility CRYRING@ESR Open
CRYRING@ESR is the early installation of the low-energy storage ring LSR, a Swedish in kind contribution to FAIR, which was proposed as the central decelerator ring for antiprotons at the FLAIR facility. An early installation opens the opp…
View article: Challenges of FAIR Phase 0
Challenges of FAIR Phase 0 Open
After two-year's shutdown, the GSI accelerators plus the latest addition of storage ring CRYRING, will be back into operation in 2018 as the FAIR phase 0 with the goal to fulfill the needs of scientific community and the FAIR accelerators …
View article: Ion-optical Measurements at CRYRING@ESR during Commissioning
Ion-optical Measurements at CRYRING@ESR during Commissioning Open
CRYRING@ESR is a heavy ion storage ring, which can cool and decelerate highly charged ions down to a few 100 keV/u. It has been relocated from Sweden to GSI, downstream of the experimental storage ring (ESR), within the FAIR project. The r…
View article: Genetic Algorithms for Machine Optimization in the Fair Control System Environment
Genetic Algorithms for Machine Optimization in the Fair Control System Environment Open
Due to the massive parallel operation modes at the GSI accelerators, a lot of accelerator setup and re-adjustment have to be made by the operators during a beam time. With the FAIR project the complexity of the accelerator facility increas…
View article: Penning-trap mass spectrometry and mean-field study of nuclear shape coexistence in the neutron-deficient lead region
Penning-trap mass spectrometry and mean-field study of nuclear shape coexistence in the neutron-deficient lead region Open
We present a study of nuclear shape coexistence in the region of neutron-deficient lead isotopes. The midshell gold isotopes Au180,185,188,190 (Z=79), the two long-lived nuclear states in At197 (Z=85), and the neutron-rich nuclide At219 we…
View article: Precision mass measurements of cesium isotopes—new entries in the ISOLTRAP chronicles
Precision mass measurements of cesium isotopes—new entries in the ISOLTRAP chronicles Open
Alkali ion beams are among the most intense produced by the ISOLDE facility. These were the first to be studied by the ISOLTRAP mass spectrometer and ever since, new measurements have been regularly reported. Recently the masses of very ne…
View article: Recent Upgrades of the SHIPTRAP Setup: On the Finish Line Towards Direct Mass Spectroscopy of Superheavy Elements
Recent Upgrades of the SHIPTRAP Setup: On the Finish Line Towards Direct Mass Spectroscopy of Superheavy Elements Open
With the Penning-trap mass spectrometer SHIPTRAP at GSI, Darmstadt, it is possible to investigate exotic nuclei in the region of the heaviest elements. Few years ago, challenging experiments led to the direct measurements of the masses of …
View article: Automatized Optimization of Beam Lines Using Evolutionary Algorithms
Automatized Optimization of Beam Lines Using Evolutionary Algorithms Open
Due to the massive parallel operation modes at GSI accelerators, a lot of accelerator setup and re-adjustment has to be made by operators during a beam time. This is typically done manually using potentiometers and is very time-consuming. …
View article: First Experimental Demonstration of the Extraction of Low Energy Beams from the ESR to the CRYRING@ESR
First Experimental Demonstration of the Extraction of Low Energy Beams from the ESR to the CRYRING@ESR Open
The CRYRING@ESR facility will provide the unique possibility for studying properties of highly charged cooled stable and short-lived ions stored at low energy for atomic and nuclear research within the FAIR project. Heavy ion beams will be…