Verification of the Geometry

The photon bomb feature of SNOMAN was used to verify that the geometry of the source chamber had been properly specified. This feature was used to generate 500 optical photons from points sampled throughout the source chamber geometry regions. The media for the nine detector elements were set to air and the photon bombs were detonated within each different region. The criteria for a successful geometry was that photons had to propagate through all regions and result in fewer than 1 in 100,000 errors causing an event to terminate. This result was achieved, and a plot mapping the source chamber is shown in Fig. 12.3.

Figure 12.3: The $^{16}$N source chamber geometry, as illuminated by photon bombs from CAN, SCINT, RING and PMT_E. Each point represents an intersection of a photon propagation path and the boundary of a detector element. By setting all detector elements to air, SNOMAN propagates the photons in straight lines, but it keeps track of all boundary crossings. Plotting the boundary crossings provides a ``photon map'' of structures within SNO.

User Control

To set off $^{16,17}$N events within this source use the command file: CALIBRATION_16N.CMD