Excerpt from Geometrical Calibration of the Nbs Electron Scattering Apparatus The nbs electron scattering apparatus is shown in figure I. The detector system and shielding platform which are mounted to the upper half of the spectrometer magnet are omitted from this figure for clarity. The energy-resolved electron beam is incident from the right in figure 1, in a u - inch diameter vacuum pipe. The beam is approximately one - half inch in diameter when it enters the magnetic field of the quadrupoles. The beam is focused by ...
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Excerpt from Geometrical Calibration of the Nbs Electron Scattering Apparatus The nbs electron scattering apparatus is shown in figure I. The detector system and shielding platform which are mounted to the upper half of the spectrometer magnet are omitted from this figure for clarity. The energy-resolved electron beam is incident from the right in figure 1, in a u - inch diameter vacuum pipe. The beam is approximately one - half inch in diameter when it enters the magnetic field of the quadrupoles. The beam is focused by the quadrupoles to a spot of less than 1 mm diameter at the target. After leaving the quadrupoles, the beam passes through the upstream beam profile scanners, whose function is to measure the size and position of the beam at this point. The beam then passes through a non-intercepting current monitor which is part of the charge measuring system The beam pipe diameter is reduced to two inches between the current monitor and the scattering chamber. In order to be able to determine the beam direction at the target, the region between the upstream beam scanners and the target is kept free of magnetic fields by wrapping the pipe with magnetic shielding. The scattering chamber is an 18 - inch diameter vertical aluminum cylinder. Ports on the scattering chamber at intervals between MO and allow direct connection of the beam-line and the spectrometer vacuum systems. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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