Flat top analysis

The cavity voltage amplitude and phase stability can be easily measured to high resolution from the acquired samples. A long history of raw samples is available from the buffer. The effectiveness of the control algorithms in suppressing disturbances of the cavity field can be measured using this tool.

 

 

 

 

Decimated signals

All the signals of the Libera LLRF system are also available in a decimated form for easy processing and display on control system screens. The cavity response to RF pulses is already available in the form of amplitude and phase signals.

 

 

 

 

Nyquist stability analysis

A powerful RF diagnostics system completely characterizes the RF system by means of built-in network vector analysis. Libera LLRF automatically uses diagnostic measurements to compute the optimal phase rotation for enabling a stable LLRF loop. The user is also provided with phase and gain stability margins. The open loop transfer function is displayed on a Nyquist diagram. The application suggests the optimum working parameters.

 

 

 

 

RF system diagnostics

During operation, the cavity decay analysis and directional coupler signals are used to monitor and control the cavity tuning.

 

 

 

System monitoring

The Libera LLRF system has an advanced health monitoring system that takes care of fans, currents, voltages and temperature.