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Figure 5
The PBIG/PBPG detector (top). The arrow indicates the direction of the FEL beam. The first and last elements are the split-electrode direct-current-measurement chambers for the vertical (upstream) and horizontal (downstream) positions of the beam and the absolute intensity. The two chambers in the middle measure the relative intensity with the help of electron multiplier plates, with the horizontal measurement upstream and the vertical downstream.

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ISSN: 1600-5775
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