We describe a simple and inexpensive flowing gas helium cryostat which efficiently cools the surface of a sample and eliminates the need for good thermal contact between the sample and a substrate.
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Characterisation at Cryogenic Temperatures of an Attenuator for an Application of Astrophysical Instrumentation with MKIDs.
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Laboratorio de Circuitos Integrados (LABIC), Departamento de Electrónica, Área de Instrumentación, Instituto de Astrofísica de Canarias (IAC), 38205 La Laguna, Tenerife, Spain.
The use of non-cryogenic certified commercial electronics for cryogenic applications may be attractive due to their cost and availability, but it also carries risks related to reliability, performance and thermal compatibility. The decision to use commercial components that are not certified for cryogenics instead of components specifically designed for such applications must be carefully weighed based on specific project needs and risk tolerances. This work presents the characterisation of an attenuator circuit at cryogenic temperatures used in a microwave kinetic inductance detector (MKID) readout system.
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A hermetic on-cryostat helium source for low temperature experiments.
Rev Sci Instrum
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EeroQ Corporation, Chicago, Illinois 60651, USA.
We describe a helium source cell for use in cryogenic experiments that is hermetically sealed in situ on the cold plate of a cryostat. The source cell is filled with helium gas at room temperature and, subsequently, sealed using a cold weld crimping tool before the cryostat is closed and cooled down. At low temperatures, the helium condenses and collects in a connected experimental volume, as monitored via the frequency response of a planar superconducting resonator device sensitive to small amounts of liquid helium.
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Med Phys
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Background: In the Unity MR linac (Elekta AB, Stockholm, Sweden), the radiation beam traverses the cryostat and the coil support structure. The resulting beam attenuation must be considered for output calibration and its variation with gantry angle must be characterized in the treatment planning system (TPS).
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