Sigma LBA-708 Energy Calibration Procedure, Quantitative display, on/off, Total energy Aperture

Figure 23

If you enter an Energy of Beam value of 0 (zero) the energy related results items, such as, Total (energy), Peak (fluence), Min, Gauss Height, etc., will be computed in processed digitizer units. Processed digitizer units are called counts, and are dimensionless. In this case, no units will be displayed in the results window.

Any non-zero entry will cause the displayed results to be reported in the units selected. Fluence results will also rely upon the Pixel Units entry to complete the energy density definition. A Pixel Unit selection of PX stands for pixel spatial units. The PX unit is dimensionless.

When the Scale Units are set to µm, mm, or cm, the energy density results are computed as energy/cm². When the scale units are set to PX or m, the density results are displayed as energy/PX², or energy/m² respectively.

3.2.6.2Energy Calibration Procedure

After you have set up the LBA-PC and are ready to acquire data, the energy calibration procedure involves the following three operation:

1.Execute an Ultracal! operation.

2.Acquire a calibration frame on the 2D display and a matching energy measurement on an external power/energy meter.

3.Enter the energy and select the units in the Computations dialog box.

3.2.6.3Quantitative display, on/off

Check the Quantitative box if you want to have the quantitative results item appear in the results window. Checking this box only controls the display of these results. Even if not checked, these results will be computed. The only way to turn off all computational activity is to minimize the Results display window. The displayed quantitative results consist of the following:

•Total energy

•% in Aperture

•Peak fluence

•Min

•Peak Loc..ation, in X and Y

•Centroid location, in X and Y

•Beam Width, in both X and Y or Major and Minor axes

•Beam Diameter

Operator’s Manual 68 LBA-PC