SPECS 2D-CCD, User Manual

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Manual V2.docx | Status 10.12.2015 | Version 1
Templates for the 2D-CCD / 3D-VLEED detector 3.1
This section contains an overview of the templates delivered with the 2D-CCD / 3D-VLEED
detector.
3.1.1 PHOIBOS 1D Adjustment
The PHOIBOS 1D adjustment template is used for optimizing the detector signal using the
total intensity channel of the Ferrum detector. When you run this template, the analyzer
continually measures the intensity of electrons with a fixed energy. The signal is recorded by
the single channel detector without measuring any spin-resolved signal.
Note
This template is essentially identical to the PHOIBOS Spin Adjustment template, except that
the Spin Detector Control is set to Channel 1.
3.1.2 PHOIBOS 1D DVS
The optimum operating voltages for the CEMs of the Ferrum detector are determined by
SPECS during testing and are included in the test report. As the detector ages, the gain is
reduced and you need to increase the detector voltage to compensate. See the Focus Ferrum
spin detector manual for more information about life time and ageing of the CEMs.
Caution!
Do not set the detector voltage too high. The lifetime of the CEMs is significantly reduced at
high operating voltages. The optimum operating point is about 50–100 V beyond the plateau
of the intensity versus detector voltage sweep.
Caution!
The intensity of the excitation source needs to be much higher in the spin detector
compared to the CCD detector. Always turn the intensity of the source down before using
the CCD detector.
To check the detector voltage:
Transfer a clean sample into your system and place it in the measurement position in front
of the analyzer.
2. Switch on the excitation source.
3. Perform a quick scan to make sure that everything is working correctly. In
particular, you should confirm that the intensity of the source is not too high (this
is particularly important for electron sources).
4. Click to start a new project in the Experiment Editor.
5. Click PHOIBOS 1D DVS in the Load Template section.
6. Click to start the scan.