A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Cold source of atomic hydrogen for loading large magnetic traps
Tekijät: Semakin, Aleksei; Ahokas, Janne; Hanski, Otto; Dvornichenko, Slava; Kiilerich, Tom; Nez, Francois; Yzombard, Pauline; Nesvizhevsky, Valery; Widmann, Eberhard; Crivelli, Paolo; Vasiliev, Sergey
Kustantaja: Springer Science and Business Media LLC
Kustannuspaikka: NEW YORK
Julkaisuvuosi: 2025
Journal: European Physical Journal D
Tietokannassa oleva lehden nimi: The European Physical Journal D
Lehden akronyymi: EUR PHYS J D
Artikkelin numero: 23
Vuosikerta: 79
Numero: 3
Sivujen määrä: 15
ISSN: 1434-6060
eISSN: 1434-6079
DOI: https://doi.org/10.1140/epjd/s10053-025-00976-1
Verkko-osoite: https://doi.org/10.1140/epjd/s10053-025-00976-1
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/491636222
We present a design and performance tests of an intense source of cold hydrogen atoms for loading large magnetic traps. Our source is based on a cryogenic dissociator of molecular hydrogen at 0.6 K followed by a series of thermal accommodators at 0.5, 0.2 and 0.13 K with inner surfaces covered by a superfluid helium film. All components are thermally anchored to corresponding stages of a dilution refrigerator. The source provides a continuous flux of 7 x 10(13) H atoms/s in a temperature range of 130-200 mK. We have successfully used the source for loading a large Ioffe-Pritchard magnetic trap recently built in our laboratory (Ahokas et al. in Rev Sci Instrum 93(2):023201, 2022). Calorimetric measurements of the atomic recombination heat allow reliable determination of the atomic flux and H gas density in the trap. We have tested the performance of the source and loading of H atoms into the trap at various configurations of the trapping field, reducing the magnetic barrier height to 75% and 50% of the nominal value of 0.8 T (0.54 K) as well as at the open configuration of the trap at its lower end, when the atoms are in contact with the trapping cell walls covered by a superfluid helium film. In the latter case, raising the trapping cell temperature to 200-250 mK, the low-field seeking atoms at densities exceeding 10(11) cm(-3) can be stored for the time over 10(3) s, sufficiently long for experiments on precision spectroscopy of cold H gas.
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This project was supported by the Jenny and Antti Wihuri foundation. FN and PY acknowledge support from IEA QRECH 2021-2022 and IRP GRASIAN 2024-2028. The work of PC was supported by the European Research Council (Grant 818053-Mu-MASS) and the Swiss National Science Foundation (Grants 197346 and 219485).
