SPECS 2D-CCD, User Manual

Page: 73 / 85

72
Manual V2.docx | Status 10.12.2015 | Version 1.0
A.4.1 Alignment of spin deflector 1 and the rotator lens with the alignment
camera
Use the electron gun with the beam positioned as described in section A.3.1. It requires a
very high electron current to see an image with the alignment camera.
Operate the analyzer in the RotCalib lensmode with E
kin
20 eV, E
p
= 160 eV. Set the aperture
wheel to Slit5/open.
With the RotL setting 0, a round blue spot should be visible, as shown in Figure 45. Center
this spot with SDefl1X and SDefl1Y. It may be necessary to fine adjust the position of the
electron beam on the sample as well. The parameters FD1 and FD2 will also influence the
image, see the PHOIBOS manual. It is advantageous to set FD1 and FD2 to 0, since this will
give a more stable performance when E
kin
and E
p
are changed.
Figure 45. Image from the alignment camera with RotL set to zero.
Now set RotL to +1 and position the exit slits in front of the detector. An image as shown in
Figure 46 should appear.