The Electron Mass and Calcium Isotope Shifts by Florian Köhler-Langes

Author:Florian Köhler-Langes
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

To cool the ion in our experimental apparatus, we exclusively use the resistive cooling technique, introduced in Sect. 3.​2.​3. Here, the axial motion of the ion thermalizes with the axial resonator, which itself has to be cooled by a thermal bath. In our case, the bath is given by the liquid helium reservoir of the experimental apparatus, see below.

The cooling system of the apparatus includes an outer liquid nitrogen reservoir and an inner reservoir of liquid helium at normal pressure with boil-off temperatures of for nitrogen and for helium. To reduce the thermal radiation and thus the evaporation rate of the helium, a -shield is set in a vacuum between these reservoirs, see Fig. 4.1. This shield is only fixed to the filling/recovery pipe of the helium reservoir of the apparatus.

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