Libera Photon

The Libera Photon is a photon beam position processor, compatible with various detectors (e.g. diamond detectors, blade XBPMs and ionization chambers). It supports external BIAS source which is then applied to each of the 4 input channels. Position data is available at multiple configurable data rates and bandwidths. A dedicated RJ-45 interface can be used for real-time streaming data. With optional hardware upgrade, the analog and digital outputs enable the user to perform local feedback in the beamline.

Product Description


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

Data processing:

The signal processing chain is composed of analog signal processing, digitalization at ~2.5 MHz (18 bit) and digital signal processing. At the input, there are four current-to-voltage converters with six ranges allowing measurements of current from several pA to 2 mA. The digital signal processing consists of signal conditioning and position calculation. The advantage of the Libera Photon is user-configurable IIR filtering and decimation for the fast and slow data streams. Two IIR filter blocks provide the user the freedom to develop the filter (e.g. in Matlab) and upload the coefficients to Libera Photon directly. The processed data are delivered to the user via four data paths.

The reference input (revolution clock) can be used to synchronize the data with the accelerator’s timing system.



The instrument can be used for both, fast changing and slow changing signals. A typical temperature drift is measured on the low-bandwidth data (0.1 Hz).

Libera Photon Performance
Temperature drift, typical0.01 μm/°C
8-hour stability (23°C, 200 μA)0.02 μm
RMS uncertainty @ 180 μA (10 kHz data rate)<0.02 μm
RMS uncertainty @ 180 μA (10 Hz data rate)<0.01 μm
Libera Photon
Clear filters
Soleil FOFB System
Photon BPM Electronics Development at Taiwan Light Source…DIPAC2011, Germany
Photon Beam Position Measurements by Libera Photon Using Copper Blade Sensors at SOLEIL Synchrotron…BIW10, US
Light proton therapy LINAC LLRF system development (LINAC’18, Beijing, China)
Photon BPM Electronics Development at Taiwan Light Source…DIPAC2011, Germany
Kees Scheidt
Diagnostics Head (ESRF, Grenoble)

On our Booster beam, we collected much data and features, that we could not measure or even detect before.

Engineering Executive
NDA locked

The prototyping and development Instrumentation Technologies has provided for our team has been exceptional.

Libera Photon is used at the following labs:

  • Canadian Light Source – CLS (Canada)
  • Argonne National Laboratory – APS (United States)
  • KIT – Karlsruhe Institute of Technology – Forschungszentrum Karlsruhe– ANKA (Germany)
  • Paul Scherrer Institute – SLS (Switzerland)
  • National Synchrotron Radiation Laboratory – HLS/HLS II (China)
  • High Energy Accelerator Research Organization (KEK) – PF (Japan)
  • National Synchrotron Radiation Research Center – TLS, TPS (Taiwan)
  • DIAMOND Light Source (United Kingdom)
  • Societe civile – SOLEIL Synchrotron (France)
  • Shanghai Synchrotron Radiation Facility (SINAP) – SSRF (China)
  • The European Synchrotron Radiation Facility (ESRF) – ESRF, beamline (France)
  • Hiroshima Synchrotron Radiation Center – HiSOR (Japan)
  • Consortium for the Exploitation of the Synchrotron Light Laboratory (CELLS) – ALBA (Spain)
  • Pohang Accelerator Laboratory (PAL) – PLS II (South Korea)
  • Brookhaven National Laboratory (BNL) – NSLS II (United States)
  • Institute of High Energy Physics (IHEP) – BEPC II (China)
  • Max Planck Institute for Chemical Physics of Solids – MPG (Germany)
  • Jagiellonian University – SOLARIS (Poland)
  • Northwestern University (United States)