Photos during the November/December 2010 upgrading
During the upgrading on Nobember/December 2010: the shield has been opened in HP Nitrogen atmosphere in order to replace the 50 low background PMTs with new ones having higher quantum efficiency.
Working in HP Nitrogen atmosphere:
 Working on the installation of new PMTs - 1 - |
 Working on the installation of new PMTs - 2 - |
 Assembling of the new PMT with its divider |
 New PMT enclosed in its shaped copper housing |
 A view of a new PMT |