Resonance ionization of holmium for ion implantation in microcalorimeters

Schneider, F.; Chrysalidis, K.; Dorrer, Holger; Düllmann, Ch. E.; Eberhardt, Κ.; Haas, R.; Kieck, T.; Mokry, C.; Naubereit, P.; Schmidt, S.; Wendt, Κ.

doi:10.1016/j.nimb.2015.12.012

Cited by 29 publications

(35 citation statements)

References 13 publications

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“…In Table 1, the negligible coefficient C photo confirms that the resonant photoionization is dominant over the non-resonant one. For the first transition, the power level P sat where half of the maximum ion current is reached, is about three times higher than in the measurements of Schneider et al [14]. This can be caused by a broader spacial profile or rather a worse overlap of the atom cloud and the laser in the ionization region at the same laser power.…”

Section: Excitation Scheme Developmentmentioning

confidence: 58%

“…To overcome the low power of external singlepass second harmonic generation with values below 300 mW for Ho [14], the technique of intra-cavity frequency doubling [15] was used. The efficient conversion leads to about 500 mW output power of the second-step laser far beside the gain-maximum wavelength of the Ti:sapphire crystal.…”

Section: Titanium-sapphire Laser Systemmentioning

confidence: 99%

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Highly efficient isotope separation and ion implantation of 163Ho for the ECHo project

Kieck

Dorrer

Düllmann

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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The effective electron neutrino mass measurement at the ECHo experiment requires high purity 163 Ho, which is ion implanted into detector absorbers. To meet the project specifications in efficiency and purity, the entire process chain of ionization, isotope separation, and implantation of 163 Ho was optimized. A new two-step resonant laser ionization scheme was established at the 30 kV magnetic mass separator RISIKO. This achieved ionization and separation efficiencies with an average of 69(5) stat (4) sys % using intra-cavity frequency doubled Ti:sapphire lasers. The implantation of a 166m Ho impurity is suppressed about five orders of magnitude by the mass separation. A dedicated implantation stage with focusing and scanning capability enhances the geometric implantation efficiency into the ECHo detectors to 20(2) %.

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Section: Excitation Scheme Developmentmentioning

confidence: 58%

Section: Titanium-sapphire Laser Systemmentioning

confidence: 99%

Highly efficient isotope separation and ion implantation of 163Ho for the ECHo project

Kieck

Dorrer

Düllmann

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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“…Efficient resonance ionization schemes for Ho were developed by the Mainz group at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory [117], showing specifically high ionization efficiency of up to 40 %. In preparatory experiments with stable 165 Ho with calibrated atom amounts in the range of 10 14 to 10 16 , reproducible efficiencies in the range of (32 ± 5) % independent of the sample size were reached at RISIKO [113].…”

Section: Mass Separationmentioning

confidence: 95%

“…Within the ECHo collaboration, the Institute for Nuclear Chemistry at the Johannes Gutenberg University Mainz, which has decade-long experience with high-performance chemical separation of substantial amounts of radionuclides, see, e.g., [109][110][111], performs the chemical separation. The mass separation is performed at the RISIKO mass separator [112,113] operated at the Institute of Physics at the Johannes Gutenberg University Mainz or at the General Purpose Separator at the ISOLDE facility at CERN [60] to further purify the initial 163 Ho samples by an efficient and selective suppression of the 166m Ho contamination.…”

Section: Reactor Production Of 163 Homentioning

confidence: 99%

“…Samples for microcalorimetric measurements So far, implantations of 163 Ho for the measurement of the calorimetric spectrum have been performed at ISOLDE GPS [32,64] and at RISIKO [113,118] as described above. Further implantations for the study of all relevant aspects of the 163 Ho EC, for the optimization of detectors, and for the production of the ECHo-1k detector array for the measurement of the high-statistics spectrum are ongoing.…”

Section: Preparation Of Samples For Echo and Their Characterizationmentioning

confidence: 99%

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The electron capture in 163Ho experiment – ECHo

Gastaldo

Blaum

Chrysalidis

et al. 2017

Eur. Phys. J. Spec. Top.

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136

110

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Abstract. Neutrinos, and in particular their tiny but non-vanishing masses, can be considered one of the doors towards physics beyond the Standard Model. Precision measurements of the kinematics of weak interactions, in particular of the 3 H β-decay and the 163 Ho electron capture (EC), represent the only model independent approach to determine the absolute scale of neutrino masses. The electron capture in 163 Ho experiment, ECHo, is designed to reach sub-eV sensitivity on the electron neutrino mass by means of the analysis of the calorimetrically measured electron capture spectrum of the nuclide 163 Ho. The maximum energy available for this decay, about 2.8 keV, constrains the type of detectors that can be used. Arrays of low temperature metallic magnetic calorimeters (MMCs) are being developed to measure the 163 Ho EC spectrum with energy resolution below 3 eV FWHM and with a time resolution below 1 μs. To achieve the sub-eV sensitivity on the electron neutrino mass, together with the detector optimization, the availability of large ultra-pure 163 Ho samples, the identification and suppression of background sources as well as the precise parametrization of the 163 Ho EC spectrum are of utmost importance. The high-energy resolution 163 Ho spectra measured with the first MMC prototypes with ion-implanted 163 Ho set the basis for the ECHo experiment. We describe the conceptual design of ECHo and motivate the strategies we have adopted to carry on the present medium scale experiment, ECHo-1K. In this experiment, the use of 1 kBq 163 Ho will allow to reach a neutrino mass sensitivity below 10 eV/c 2 . We then discuss how the results being achieved in ECHo-1k will guide the design of the next stage of the ECHo experiment, ECHo-1M, where a source of the order of 1 MBq 163 Ho embedded in large MMCs arrays will allow to reach sub-eV sensitivity on the electron neutrino mass.

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Highly selective two-step laser ionization schemes for the analysis of actinide mixtures

et al. 2020

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Resonance ionization mass spectroscopy has proven to be a very efficient and selective method for the spatially resolved ultratrace determination of actinide contaminations, and the analysis of specific element and isotopic distributions on surfaces and environment particles. We report on the identification of highly element-selective optical excitation schemes identified for this purpose, with a particular focus on the precise determination of the isobaric ratios of 235U to 239Pu as well as 243Am to 241Pu. The chosen two-step ionization schemes were characterized with respect to their element selectivity on synthetic multi-element actinide mixtures, with an element ratio Pu : Am : U of 1 : 10 : 104, a composition which is typical, e.g., for spent nuclear reactor fuels.

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Resonance ionization of holmium for ion implantation in microcalorimeters

Cited by 29 publications

References 13 publications

Highly efficient isotope separation and ion implantation of 163Ho for the ECHo project

Highly efficient isotope separation and ion implantation of 163Ho for the ECHo project

The electron capture in 163Ho experiment – ECHo

Highly selective two-step laser ionization schemes for the analysis of actinide mixtures

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