|
The mean value for the whole batch is
about 18.3%, taking into account only the PMTs which fulfill
the specifications in the calculations. If we compute the mean value
for each sub-batch (250 PMTS each), one of them is just below than
18% as required. We have noticed this batch has a mean value
slightly lower than the others. Besides, all tubes satisfy the
criteria defined on the quantum efficiency (that must be greater
than 15%).
The distribution of the
480 nm efficiency is reported on figure (1).
The rejected PMTs (all) are quoted in red. As for previous batches, we consider that this
criterion is ok. |
