Development and evaluation of 10-inch Photo-Multiplier Tubes for the Double Chooz experiment

Understand

The goal of Double Chooz experiment is a precise measurement of the last unknown mixing angle theta_13 using two identical detectors placed at far and near sites from Chooz reactor cores.

• The detector is optimized for reactor-neutrino detection using specially developed 10-inch PMTs.
• We developed two types of measurement systems and evaluated 400 PMTs before the installation.
• Those PMTs fulfill our requirements, and a half of those have been installed to the far detector in 2009.