haloscope (IMAGE) DOE/Pacific Northwest National Laboratory Caption The haloscope insert (pictured here being extracted from the bore of a superconducting magnet below) contains a cryogenic dilution refrigerator and a copper cavity with a movable tuning rod at its center. Credit University of Washington Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.