Browsing by Author "Dursun, Sahin"

This thesis focuses on the initial measurements and development of a 1.5K target temperature cryostat to contain all quantum standards in the quantum metrological triangle. Currently, the cryostat can reach 4.2K end temperature with a cryocooler to liquefy helium for cooling experiments related to the quantum standards of SI-units which require 1.5K end temperature and the 1.5K cooling circuit is one of the research questions of the thesis for future development of the cryostat. Measurements included cooling cycles in a helium environment for liquefaction, as well as no load conditions. Results of the experimentation conclude that liquefaction was unsuccessful at this stage, but could be achieved with improved temperature control. The thesis is based on experimental work carried out in VTT technical research center of Finland, during the course of which the cryostat was progressively developed towards the future utility of combining experiments that realize the quantum standards of Ampere, voltage and resistance under a single low temperature experimental platform, the unified quantum standard cryostat.