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Figure 14
The projected width of the pancake and butterfly moderators as a function of beamport angle. (a) Thermal moderators. (b) Cold moderators. For the pancake thermal moderator, the width is measured from the focal point (as shown in Fig. 12[link]) until the position where the moderator brightness has decreased by a factor of two, projected onto the viewed direction. All the other curves show the width simply defined by the geometry, starting from the focal point. The beamport angle is defined as counter-clockwise, with zero running along the transmitted proton beam. The widths on the other side of the proton beam are the same.

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