HM Layout for complete line. Based on PD1, the site of the Proton Driver is chosen at the west side of Kautz Road (see Figure 2.3). The elevation of the Proton Driver is the same as that of the Main Injector. This ensures adequate radiation shielding. The NuMI beam line is deeper so the NuMI line and the Proton Driver do not intersect. Although the Proton Driver intersects the neutrino beam from the MiniBooNE target, this is not a problem. The location of this site in a wetland area raises concerns addressed in Chapter 11.
Another possible location for a racetrack type Proton Driver is in the vicinity of the MI-8 beam line, between the MI-8 and MI-10 buildings. This would shorten the lengths of the 600 MeV and 8 GeV beam lines and reduce their cost. However, it has a number of disadvantages because the new linac extension would have to be in the present MI-8 enclosure: (1) Although the CCL modules can fit into the MI-8 enclosure, it would be crowded. The transportation of hardware in the enclosure would be difficult. (2) A curved linac structure is not preferred. (3) The installation of the new modules would interrupt the ongoing RunII program. (4) Because only the permanent magnet portion of the MI-8 enclosure has room for a new linac, the usable space for a future linac upgrade would be limited. Therefore, this siting option is rejected at this time.