Caen ELS BEST, User Manual, Page: 35 / 47

BEST User’s Manual BEST Local GUI
35
4.3 Beamline Configuration
This window allows calibrating and setting the
BEST
system to exactly match the
actual beamline configuration. Its proper configuration is of paramount importance in
order to insure a correct functionality of the system and a meaningful calibration of
the units used to display data. Users can access this window by clicking on
Settings-
>Beamline .
Figure 25 : Beamline Configuration window for a 90° phBPM system (on the left) and for a
45° phBPM system (on the right).
A quick overview of the available beamline configuration options are represented in
the following sections.
4.3.1 Beam Position Monitor
The BPM (Beam Position Monitor) section allows the input of the correct phBPM
geometry, by selecting how the readout channels of the
TetrAMM
are matched to
the phBPM. It also provides the capability to properly calibrate the position-sensitive
detector by inserting the experimentally determined scaling factors in the beam
position calculations.
In a standard 90° phBPM system (e.g. systems based on photodiodes located
top/bottom & left/right of a scattering foil), the X-Y and Intensity (I
0
) of the Beam are
calculated with the following formulas: