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![[Figure 2]](pp5073fig2mag.jpg)
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Figure 2
An excitation signal is applied to the DCM second crystal oscillating the beam along the DCM rocking-curve peak and vertically along the collimating optics immediately upstream of the sample and the detector. The phase is detected via the LIA and used to control the vertical VFM mirror piezo steering actuator. The lock-in here is phase locked with lock-in used for DCM feedback. Details for DCM lock-in feedback circuitry can be found in the literature (Fischetti et al., 2004  ; Stoupin et al., 2010; van Silfhout et al., 2014; Mills & Pollock, 1980; van Mellaert & Schwuttke, 1970). |
![[Figure 2]](pp5073fig2.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
