Libera Single Pass E

Benefits:

• Analog and real-time digital signal processing and high-level software
• Internal phase alignment of input signals
• Up to four beam processors in one chassis
• Easy to integrate in any control system

Data processing:

The signal processing chain on the Libera Single Pass E is composed of analog signal processing, digitalization on fast ADCs and digital signal processing. It may handle the following beam modes:

• Single-bunch mode
• Bunch train mode
• CW – Continuous Wave
• Various bunch structures

Data processing is initiated on the external trigger signal. The short signal from the detector is first lengthened by the bandpass filters on the analog board (filters are designed in relation to the accelerator parameters). Further signal processing is defined by various parameters defining the processing window for a certain beam mode.

The signal energy is calculated from the signal defined by the processing window. After calculating all four amplitudes, position is calculated using formulas for X and Y. Four options can be used for position calculation:

• Orthogonal pickup orientation
  • • Linear formula
    • Polynomial formula – 3rd order
• Diagonal pickup orientation
  • • Linear formula
    • Polynomial formula – 3rd order

In the case of longer beam structures a similar data processing is used – based on the appropriate signal windowing. The data calculation is initiated on the external trigger and is automatically stopped after the bunch structure is over. The decimated batch of data is available to the control system. In the case of CW operation, the unit continuously processes and outputs the decimated beam position data. The external low frequency reference trigger signal needs to be provided for this case.

Interfaces:

1. Intel ATOM COM Express with extensive communication interfaces: The FPGAs and a powerful personal computer based on the PCIe interface offer good resources for the implementation of low-latency control algorithms, real-time data processing and dedicated RF system diagnostics tools.

2. Up to four RF acquisition modules: The system is configured to have four satellite modules, and each of them can process 4 RF inputs. One channel on each board is used as the RF reference signal for measurement.

3. GDX module (optional): Primarily intended for fast serial data streaming. Unidirectional Gigabit Ethernet connection as a standard solution for data streaming is provided. This module is also a playground with resources for further development of signal processing and for application development.

4. EvRX timing module: Fast signal interfaces used for triggering, interlock and synchronization purposes.