The Beta-Beat GUI Optics Panel¶

The Optics Panel provides graphical interface to compare the computed optics to the nominal model. There are in total three main tabs for the optics panel:

• The Optics tab, where a tree menu (on the left) provides many physical properties to be displayed.
• The Segment-by-Segment: Segment tab, to have a look at properties in a pre-defined segment of the machine.
• The Segment-by-Segment: Element tab, to have a look at properties for a pre-defined list of elements in the machine.

Optics Tab¶

By default, the user is taken to the Optics tab. A wide variety of computed physical properties can be visualized across the entire machine.

Segment-by-Segment: Segment Tab¶

A list of pre-defined segments of the machine can be selected to view properties across said segment.

In the event that one wants to visualize a specific, non pre-defined segment, it is possible to create a new one. To do so:

• In the Optics tab, pick the start BPM by clicking on a BPM point on the optics chart.
• Pick the end BPM by clicking on another BPM point.
• A pop-up appears in which the name of the new segment has to be entered.

Clicking Go will call for another python script and take you to the Segment-by-Segment tab to view the results.

Segment-by-Segment: Element Tab¶

Pre-defined lists of elements can be selected to view properties across said elements. The working is similar to the one for different segments.

Computing Corrections¶

The Correction button at the bottom left of the optics panel can be used to calculate the optics corrections for the beam process.

The settings dialogue offers a wide range of different options for corrections. This will call different external python scripts again.

These scripts calculate corrections for beta-beat, coupling and horizontal and vertical dispersion using the computed response matrices. The following methods implement different correction algorithms:

• Coupling: Single beam correction of coupling resonances and vertical dispersion.
• Global correction: Single beam correction of phase, beta and horizontal dispersion.
• Iterative correction: Two-beams version of the global correction.
• Chromatic coupling: Single beam correction of chromatic coupling using skew sextupoles at dispersive locations.

The results are outputted in the changeparameters files. These files store the magnet names and corresponding correction strengths.

They are also displayed in the Correction Panel.