last wednesday we fixed the counter 4T11-1 by replacing both PMT's.
Notice that two weeks ago this counter was also unplagged from Tohm trigger
because it was getting hot (rates over 10mHz).....now its rate is much lower
(~5mHz) but it has still He inside....unfortunately those spare PMT's that we
used to fix the tankend weren't tested so well.
Anyways it's been plugged back.
A presto,
Massimo