20101106 Installation of Detector #2

Due to concerns about the quadrupole (QD8FF between the bending magnet and the detector) or the bpm within it blocking the signal as well as the vacuum flange after the window (for the section of bellows just after the bending magnet box beam pipe) it was decided to reposition the detector immediately after the window. The flange blocked half of the window and the window and the beam pipe section it was on were free floating. Rather than completely disassemble the current detector, another was found. The PMT should be the same as Detector #1 and was found to be a Hamamatsu R877 PMT.

Upon opening detector #2 we found that the PMT was very dirty (Figure 1) and so we cleaned it (Figure 2).

Figure 1 : Photograph of detector 2 PMT before cleaning.

Figure 2 : Photograph of detector 2 PMT after cleaning.

PMT Specs

The full specs are can be found in this pdf file. Figure 3 Shows a schematic of the PMT on its own without the casing around it.

Figure 3 : Schematic of Hamamatsu R877 PMT.