Status of the GRANIT Facility

Figure 9

Vacuum-separating window in the extraction guides. The foil must guarantee the vacuum tightness but also it should resist to an overpressure of 1.5 bar max in both directions in case of eventual fast heating of the source. Such overpressure is limited using two safety valves. The window is made with 2 aluminum half pieces milled by electrocutting reinforced by letting ribs 0.25 mm thick. Between these two parts a titanium foil 0.015 mm thick and 2 o’rings are inserted. The assembly is bolted. The window assembly had been tested with success under vacuum and under 5 bar pressure.