Report - ˆ˙ ˆ ˆ ˘ˆ &’ ˆˇ ˘ ˇ ˆ ˙ ˆ( ˆ ˙˘ ˇ ˆ ˙ · EXPERIMENTAL SET-UP We arrange two needle valves at the hot end of each pulse tube to create the valve controlled active

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