Figure 1
Light emission at the viewport of the first-mirror chamber of BL-19A/B: (a) without X-rays, and (b) and (c) with X-rays. In (c), a magnet is placed above the viewport flange. Charged particles such as electrons are trapped by the magnetic field and therefore removed in the vicinity of the magnet. Also, an X-ray path and part of the mirror seem to emit light (see discussion in Section 4.1). |