S2 prototype after installation on the X7 beam line. (picture below)
The S2 proto was mounted vertically with the PMT-B (with tapered voltage divider) on top and PMT-A (with standard bleeder) at the bottom (picture below)
view from the rear (beam entering the picture). The Carbon fiber which supports the scintillating fibers is clearly visible.(picture below)
online plots of pulse height of individual fibers (not equalized) :
the Landau distribution of the m.i.p. is clearly visible.(picture below)