Horizontal drift prototype detecto (IMAGE) DOE/Fermi National Accelerator Laboratory Caption The DUNE collaboration has finished the assembly of their large horizontal drift prototype detector, known as ProtoDUNE II, at CERN. It is the final test before ramping up mass production of DUNE detector components. Credit Photo: DUNE collaboration 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.