We report details of the apparatus and the experimental procedure leading to production of the Bose-Einstein condensate of 87 Rb atoms. Basic hydrodynamic properties of the condensate, like quadrupole oscillations and free fall expansion, are investigated. They provide also characteristics of the magnetic trap crucial for interpretation of future experiments.
The development of new generation, highperformance devices, such as MRI scanners or high-energy accelerators, (may be attributed to the use of) Nb3Sn based superconducting (SC) magnets, which are characterized by their ability to produce much higher magnetic fields than the presently used NbTi-based magnets. Due to the wind-andreact technology of the production of Nb3Sn magnets, new methods and materials for the magnet coil electrical insulation are required. The proper design of SC magnets demands the characterization of thermal properties of the new insulation materials, inter alia, in superfluid helium conditions. This paper provides experimental data of the thermal conductivity and Kapitza resistance for S-glass fiber reinforced ceramic-epoxy (LARP type) electrical insulation, measured in pressurized (at 1 bar pressure) superfluid helium in a temperature range of 1.50-2.00 K.
A 4-m-long, stabilized Fabry–Perot interferometer for frequency reference in high-resolution laser spectroscopy is described. The interferometer works as a transfer cavity locked to one laser whose frequency is Doppler-free stabilized to an atomic transition. Another laser beam whose frequency is scanned across the investigated spectral range is transmitted across the cavity to yield the frequency markers with FSR intervals below 40 MHz. The two laser beams of very close frequencies are separated at the cavity exit by a polarization method. The described methodology is simple yet versatile and provides dense and stable frequency markers for high-resolution laser spectroscopy.
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