Figure 3
A rendering of the shutter system in the XS3 shaft building and at the end of the XTD9 tunnels. The beam comes from left to right. It hits a boron carbide absorber in grazing-incidence geometry in order to distribute the heat load. Behind the absorber is the burn-through monitor as described in the text. The 8 cm-thick tungsten block in the separate vacuum chamber on the right absorbs the high-energy spontaneous radiation. |