Towards FAIR: first measurements of metallic magnetic calorimeters for high-resolution x-ray spectroscopy at GSI

Hengstler, D.; Keller, Marius; Schötz, Christof; Geist, Jeschua; Krantz, Matthäus; Kempf, Sebastian; Gastaldo, L.; Fleischmann, A.; Gaßner, T.; Weber, G.; Märtin, R.; Stöhlker, Th.; Enss, C.

doi:10.1088/0031-8949/2015/t166/014054

Cited by 37 publications

(44 citation statements)

References 5 publications

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“…By using a dry cooling system, the need of refilling liquid nitrogen or liquid helium during detector operation is omitted and a continuous usage of available beam time can be achieved. Compared to our first test experiment at the ESR, where 70% of the available beam time was used for measurements [77], during our last ESR beam time duty cycles of almost 100% could be achieved. As magnetic calorimeters are sensitive to fluctuating magnetic fields by their detection principle, disturbances by external magnetic fields might degenerate the performance of the detectors.…”

Section: Cryogenic Setupmentioning

confidence: 79%

“…With an absorption efficiency above 75% for energies around 100 keV and an energy resolution of ∆E FWHM = 46 eV at 60 keV [70] the maXs-200 detector is very well suited for spectroscopic studies of the Lamb Shift in hydrogen-like U 91+ . By increasing the temperature stability of the cryostat, even an energy resolution of ∆E FWHM = 27 eV or below may be achieved [77].…”

Section: The Maxs Detector Arraysmentioning

confidence: 99%

“…In the experiments, no degradation of detector performance due to external magnetic fields was encountered. In Figure 13, a spectrum is shown that has been taken with two pixels of a maXs-200 detector array at the gas-jet target of the ESR as an incident beam of bare Xe 54+ ions at a beam energy of 50 MeV/u was crossing a gas jet of neutral Xe atoms [77]. Lyman series of hydrogen-like Xe 53+ up to Ly-η and the K-α and K-β lines of helium-like Xe 52+ .…”

Section: First Tests Of Magnetic Calorimeters At the Esrmentioning

confidence: 99%

“…The inset shows the z/y-doublet of He-like Xe 52+ . The energy is given in the laboratory frame [77].…”

Section: First Tests Of Magnetic Calorimeters At the Esrmentioning

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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Section: Cryogenic Setupmentioning

confidence: 79%

Section: The Maxs Detector Arraysmentioning

confidence: 99%

Section: First Tests Of Magnetic Calorimeters At the Esrmentioning

confidence: 99%

“…The inset shows the z/y-doublet of He-like Xe 52+ . The energy is given in the laboratory frame [77].…”

Section: First Tests Of Magnetic Calorimeters At the Esrmentioning

confidence: 99%

See 2 more Smart Citations

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

Kraft‐Bermuth

Hengstler

Egelhof

et al. 2018

Atoms

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“…However, in the case of the Lamb shift of the 1s level in high-Z H-like systems, where the strongest Coulomb fields can be obtained, the spectroscopy needed to be conducted with solid state Ge(i) detectors ensuring a high detection efficiency, although they soon faced their limits in spectral resolution. To circumvent the low resolving power of semiconductor detectors, they were replaced by specially adapted crystal spectrometers, as will be reported in this letter, and by calorimetric low-temperature detectors yielding promising results in first storagering experiments [30,31]. In the present experiment a pair of crystal spectrometers was used to measure the 1s Lamb shift of hydrogen-like gold accomplishing for the first time both, high-Z ions and high spectral resolution.…”

Section: Introductionmentioning

confidence: 99%

Wavelength-dispersive spectroscopy in the hard x-ray regime of a heavy highly-charged ion: the 1s Lamb shift in hydrogen-like gold

et al. 2018

Self Cite

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Accurate spectroscopy of highly-charged high-Z ions in a storage ring is demonstrated to be feasible by the use of specially adapted crystal optics. The method has been applied for the measurement of the 1s Lamb shift in hydrogen-like gold (Au +78 ) in a storage ring through spectroscopy of the Lyman x-rays. This measurement represents the first result obtained for a high-Z element using high-resolution wavelength-dispersive spectroscopy in the hard x-ray regime, paving the way for sensitivity to higherorder QED effects.

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High‐precision X‐ray spectroscopy of Fe ions in an EBIT using a micro‐calorimeter detector: First results

et al. 2019

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A micro‐calorimeter X‐ray detector of the maXs‐30 type was used to record the X‐ray radiation from Fe ions, being produced in the S‐EBIT‐I electron beam ion trap at the site of GSI. The resulting spectra demonstrate the superior energy resolving power of micro‐calorimeter detectors compared with conventional semiconductor detectors. The experiment serves as another proof of principle for the application of calorimeters as dedicated high‐resolution X‐ray spectrometers at an ion facility. Together with the development of an improved analysis algorithm for online readout, these results present a step towards the use of maXs‐type detectors as standard instrumentation at GSI/FAIR.

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Towards FAIR: first measurements of metallic magnetic calorimeters for high-resolution x-ray spectroscopy at GSI

Cited by 37 publications

References 5 publications

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

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

Wavelength-dispersive spectroscopy in the hard x-ray regime of a heavy highly-charged ion: the 1s Lamb shift in hydrogen-like gold

High‐precision X‐ray spectroscopy of Fe ions in an EBIT using a micro‐calorimeter detector: First results

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