Systematic Vibration Studies on a Cryogen-Free $$^3$$ 3 He/ $$^4$$ 4 He Dilution Refrigerator for X-ray Spectroscopy at Storage Rings

Scholz, P.; Kraft‐Bermuth, S.; Andrianov, V. A.

doi:10.1007/s10909-015-1438-z

Cited by 6 publications

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“…In addition, the use of 4 He increases the operational costs and demands interruptions of beam time for refilling. Therefore, for the next generation of microcalorimeters, a 3 He/ 4 He dilution refrigerator with a pulse tube cooler for the outer temperature shields was designed and commissioned [65]. It features a side arm which is kept at an operating temperature of 10 mK and fits into the ESR gas-jet target like the setup of Bleile et al [60], but the system does not need any maintenance during beam times.…”

Section: Cryogenic Setupmentioning

confidence: 99%

“…As the heat capacity limits the active area of one single detector pixel, the number of the detector pixels has to be increased from 12 as of now to 96. On the other hand, the geometrical constraints at the ESR gas-jet target limit the outer diameter of the side arm to 90 mm [60,65]. Accordingly, the mount of the detectors was re-designed by introducing additional high-density plugs in order to fit three detector arrays with a total of 96 pixels inside the vacuum chamber of the side arm (see Figure 5).…”

Section: Sim-x: the Next Generation Silicon Microcalorimeter Arraymentioning

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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