Libera Spark ERXR / ERPT

Key Features of Libera Spark ERXR/ ERPT

• High Measurement Resolution: Typically sub-micron RMS at turn-by-turn data rate. 
• Programmable Attenuators: A 15 dB input attenuator and 31 dB internal attenuator ensure optimal signal range adjustment. 
• Synchronization Capabilities: Multiple instruments can be synchronized via a reference clock (turn-by-turn) and a PLL, ensuring seamless integration and accurate measurements across devices. 
• Efficient Hardware Platform: Designed for low power consumption and is powered through Power-over-Ethernet. It generates no noise and does not require forced cooling. 
• Control System Compatibility: Supports EPICS and TANGO control systems out-of-the-box, with support for other interfaces (Python, HTTP, telnet). 

Signal Processing: 

Input signals are sampled at nominal sampling frequency which can be generated internally (PLL-controlled) or externally. A/D converters have 14-bit resolution and support the sampling frequency up to 125 MHz.
The beam position calculation equation can be configured for diagonal or orthogonal pickup orientation and supports scaling and offset parameters. Position is calculated at turn-by-turn data rate and further filtered to lower data rates and bandwidths.
Data from buffers is available to multiple clients in parallel. Additionally, a real-time data stream can be read independently from the CPU and is intended for real-time applications (e.g. feedback loops). 

Data Processing:

Signals from the BPM pickups are filtered and sampled at 100-125 MHz PLL-controlled sampling frequency. Raw ADC data is stored in a buffer and further processed through a time-domain processing block (TDP) and frequency-domain processing block (DDC, I&Q demodulation). Optionally, a special instrument’s version supports additional DDC block for pilot-tone signal.

The turn-by-turn processing blocks can be fine-tuned with processing delay, offset and masking window. Turn-by-turn data from both sources is written to circular buffers which accommodate few millions of turns. Data can be read in various modes: triggered, on-demand, with +/- offset, etc.

Turn-by-turn data from the Time domain processing block is particularly useful for machine commissioning and/or measurement of a single-bunch single-turn trajectory.

The Fast and Slow data are both generated from the turn-by-turn data using FIR filters with 2 kHz and 5 Hz bandwidths, respectively. Optionally, the Fast data can be output through a dedicated RJ-45 interface as a real-time data stream.

Software: 

Software and FPGA code runs in Zynq 7020 which combines the Programmable Logic (PL) and Processing Subsystem (PS). Libera BASE software framework hosts the application software and establishes communication with the FPGA and upper layer software interfaces. The interface servers are compatible with most common control system interfaces such as: 

• EPICS: libera-ioc 
• TANGO: libera-ds 
• MATLAB/LabVIEW: libera-telnet-server 
• HTTP/WEB: libera-http-plugin 
• C++: libera-mci 
• Python: libera-pymci

If we have not yet convinced you, here is a list of benefits SPARK ERXR/ERPT have in comparison with other similar products: 

• • Best price/performance ratio
  • Compact and robust design
  • Power over Ethernet
  • No maintenance required
  • Source code available
  • Variety of interfaces (e.g. EPICS, TANGO, HTTP, MATLAB, etc.)