Electron transport in macroscopic borosilicate capillaries with bending angles of 90° and 360°

In this work, we present observations about the transport of 15.2 keV electrons with a beam current 21 μA through macroscopic dielectric capillaries. These capillaries are made borosilicate glass an inner diameter 6 mm, and samples bending angle 90° 360° were investigated. The electron gun was adjusted, injected into capillary had divergence half 0.75°. A retarding field analyzer (RFA) installed at outlet to collect transported investigate particle energy exiting (Fig. 1). occurred nearly instantaneous in both capillaries, RFA detected around 20 for resulting transmission coefficient over 95%. Energy measurements showed that is only several volts, which reveals lost almost all their incident while traveling capillary. large amount particles most likely secondary emitted from sample. fact coefficients similarly high, can still be although already 90°, results many questions shall investigated further studies. blueish glow during due cathodoluminescence effects.