A5076404050- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Atomic and Molecular Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Scientific Measurement and Uncertainty Evaluation
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced NMR Techniques and Applications
- Advanced Fiber Laser Technologies
- Radioactive Decay and Measurement Techniques
- NMR spectroscopy and applications
- Advanced MRI Techniques and Applications
- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- Mass Spectrometry Techniques and Applications
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Quantum, superfluid, helium dynamics
- Advanced X-ray and CT Imaging
- Space Exploration and Technology
- Laser-induced spectroscopy and plasma
- Physics of Superconductivity and Magnetism
- Computational Physics and Python Applications
- Astrophysical Phenomena and Observations
- Quantum optics and atomic interactions
- Neutrino Physics Research
Max Planck Institute for Nuclear Physics
2015-2025
European Organization for Nuclear Research
2022-2025
Friedrich Schiller University Jena
2024-2025
RIKEN
2022-2024
Physikalisch-Technische Bundesanstalt
2015-2022
Wuhan Institute of Physics and Mathematics
2021
Chinese Academy of Sciences
2021
Martin Luther University Halle-Wittenberg
2012-2015
Control over the motional degrees of freedom atoms, ions, and molecules in a field-free environment enables unrivalled measurement accuracies but has yet to be applied highly charged ions (HCIs), which are particular interest future atomic clock designs searches for physics beyond Standard Model. Here, we report on Coulomb crystallization HCIs (specifically (40)Ar(13+)) produced an electron beam ion trap retrapped cryogenic linear radiofrequency by means sympathetic cooling through...
Electron beam ion traps (EBITs) are ideal tools for both production and study of highly charged ions (HCIs). In order to reduce their construction, maintenance, operation costs, we have developed a novel, compact, room-temperature design, the Heidelberg Compact EBIT (HC-EBIT). Four already commissioned devices operate at strongest fields (up 0.86 T) reported such EBITs using permanent magnets, run electron currents up 80 mA, energies 10 keV. They demonstrate HCI production, trapping,...
In vacuo cryogenic environments are ideal for applications requiring both low temperatures and extremely particle densities. This enables reaching long storage coherence times, example, in ion traps, essential requirements experiments with highly charged ions, quantum computation, optical clocks. We have developed a novel cryostat continuously refrigerated pulse-tube cryocooler providing the lowest vibration level reported such closed-cycle system 1 W cooling power <5 K experiment. A...
A cryogenic radio-frequency ion trap system designed for quantum logic spectroscopy of highly charged ions (HCI) is presented. It includes a segmented linear Paul trap, an in-vacuum imaging lens, and helical resonator. We demonstrate ground state cooling all three modes motion single 9Be+ determine their heating rates as well excess axial micromotion. The shows one the lowest levels electric field noise published to date. investigate magnetic-field suppression in shields made from copper,...
Promising searches for new physics beyond the current Standard Model (SM) of particle are feasible through isotope-shift spectroscopy, which is sensitive to a hypothetical fifth force between neutrons nucleus and electrons shell. Such an interaction would be mediated by could in principle associated with dark matter. In so-called King plots, mass-scaled frequency shifts two optical transitions plotted against each other series isotopes. Subtle deviations from expected linearity reveal such...
Abstract The x-ray spectra recorded with high-resolution spectrometers onboard satellite observatories contain valuable information about a wide range of different hot astrophysical environments. However, our ability to extract this is currently often limited by the availability and accuracy atomic data, as they are foundation plasma models. This especially true for highly charged ions, ever-present in plasmas. Laboratory spectroscopy experiments can provide urgently needed data benchmark...
Abstract Precision measurements using low-energy antiprotons, exclusively available at the antimatter factory (AMF) of CERN 1 , offer stringent tests charge–parity–time (CPT) invariance, which is a fundamental symmetry in Standard Model particle physics 2 . These have been realized, for example, antiprotonic helium 3 and antihydrogen 4 In our cryogenic Penning-trap experiments 5 we measure magnetic moments 6,7 charge-to-mass ratios protons antiprotons now provide most precise test CPT...
Nonlinear effects of the King plot in isotope shifts 2$P$ fine-structure transitions Be-, B-, and C-like argon ions are investigated through large-scale configuration-interaction calculations. Nonlinearities found to be four orders magnitude larger than previous estimates comparable systems. This work could important for identification possible nonlinearities originating from physics beyond standard model.
Most ions lack the fast, cycling transitions that are necessary for direct laser cooling. In most cases, they can still be cooled sympathetically through their Coulomb interaction with a second, coolable ion species confined in same potential. If charge-to-mass ratios of two types too mismatched, cooling certain motional degrees freedom becomes difficult. This limits both achievable fidelity quantum gates and spectroscopic accuracy. Here we introduce novel algorithmic protocol transferring...
We demonstrate a widely applicable technique to absolutely calibrate the energy scale of x-ray spectra with experimentally well-known and accurately calculable transitions highly charged ions, allowing us measure K-shell Rydberg spectrum molecular O$_2$ 8 meV uncertainty. reveal systematic $\sim$450 shift from previous literature values, settle an extraordinary discrepancy between astrophysical laboratory measurements neutral atomic oxygen, latter being calibrated against aforementioned...
This paper reports on the development and testing of a novel, highly efficient technique for injection very rare species into electron beam ion traps (EBITs) production charged ions (HCI). It relies in-trap laser-induced desorption atoms from sample brought close to resulting in high capture efficiency EBIT. We have demonstrated steady HCI stable isotope 165Ho samples only 1012 (∼300 pg) charge states up 45+. these can be subsequently extracted use other experiments or stored trapping volume...
A key requirement for the correct interpretation of high-resolution X-ray spectra is that transition energies are known with high accuracy and precision. We investigate K-shell features Ne, CO$_2$, SF$_6$ gases, by measuring their photo ion-yield at BESSY II synchrotron facility simultaneously 1s-np fluorescence emission He-like ions produced in Polar-X EBIT. Accurate ab initio calculations transitions these provide basis calibration. While CO$_2$ result agrees well previous measurements,...
Sympathetic Coulomb crystallization of highly charged ions, retrapped in a cryogenic radiofrequency trap, is demonstrated by an over seven orders-of-magnitude decrease motional temperature.
We present the design and characterization of a cryogenic window based on an ultra-thin aluminized biaxially oriented polyethylene terephthalate foil at T < 10 K, which can withstand pressure difference larger than 1 bar leak rate <1×10-9 mbar l/s. Its thickness ∼1.7 μm makes it transparent to various types particles over broad energy range. To optimize transfer 100 keV antiprotons through window, we tested degrading properties different aluminum coated polymer foils thicknesses between 900...
Currently, the world's only source of low-energy antiprotons is AD/ELENA facility located at CERN. To date, all precision measurements on single have been conducted this and provide stringent tests fundamental interactions their symmetries. However, magnetic field fluctuations from operation limit upcoming measurements. overcome limitation, we designed transportable antiproton trap system BASE-STEP to relocate laboratories with a calm environment. We anticipate that will facilitate enhanced...
We demonstrate a new temperature record for image-current mediated sympathetic cooling of single proton in cryogenic Penning trap by laser-cooled ^{9}Be^{+}. An axial mode 170 mK is reached, which 15-fold improvement compared to the previous best value. Our technique applicable any charged particle, so that measurements presented here constitute milestone toward next generation high-precision Penning-trap with exotic particles.
We demonstrate efficient subthermal cooling of the modified cyclotron mode a single trapped antiproton and reach particle temperatures T_{+}=E_{+}/k_{B} below 200 mK in preparation times shorter than 500 s. This corresponds to fastest resistive single-particle ever demonstrated. By particles such low energies, we detection spin transitions with an error rate <0.000 023, more 3 orders magnitude better previous best experiments. method has enormous impact on multi-Penning-trap experiments that...
Nonlinearities in King plots (KP) of isotope shifts (IS) can reveal the existence beyond-Standard-Model (BSM) interactions that couple electrons and neutrons. However, it is crucial to distinguish higher-order Standard Model (SM) effects from BSM physics. We measure IS transitions ${{}^{3}P_{0}~\rightarrow~{}^{3}P_{1}}$ $\mathrm{Ca}^{14+}$ ${{}^{2}S_{1/2} \rightarrow {}^{2}D_{5/2}}$ $\mathrm{Ca}^{+}$ with sub-Hz precision as well nuclear mass ratios relative uncertainties below...
We present a novel ultrastable superconducting radio-frequency (RF) ion trap realized as combination of an RF cavity and linear Paul trap. Its quadrupole mode at 34.52 MHz reaches quality factor $Q\approx2.3\times 10^5$ temperature 4.1 K is used to radially confine ions in ultralow-noise pseudopotential. This concept expected strongly suppress motional heating rates related frequency shifts which limit the ultimate accuracy achieved advanced traps for metrology. Running with its...