The KAGRA QPDs will be used for the TAMA OpLev.

In order to prepare their installation, I checked the available space for these QPDs.

The most critical one is the Input Mirror ones : there is only a lateral space of 70 mm between the various beams. Also, the longitudinal space between the first QPD and the end of the window optical table is 60 mm.

As the KAGRA QPDs have  horizontal size at the order of 62 mm (and vertical 73 mm) , it will be required to design our own cover box.

For all the others OpLev there sould not be any critical space constraints