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.

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Benefits:

  • 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.)

Signal processing:

At the input, there are four current-to-voltage converters with six ranges allowing measurements of currents from several pA to 2 mA. A/D conversion is done with 2.5 MHz 18-bit ADCs. The digital signal processing consists of signal conditioning and position calculation. Signal conditioning includes channel scaling and offset (dark current) removal and averaging over user-configurable window. Position calculation equation is user-configurable and can use various combinations of the input channels. 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.

Interfaces:

  1. Additional RJ-45 interface for fast data streaming.
  2. Memory card slot.
  3. Serial console (Micro-B USB).
  4. RJ-45 for 1000Base-T Cu GbE connection and Power-over-Ethernet.
  5. USB slot.
  6. Connector for external BIAS voltage source
  7. TRIAX connectors for connections to the current detectors or sources.
  8. LEMO coaxial, used for various trigger signals (e.g. revolution clock, injection trigger).

Measurement performance:

The instrument can be used for both, fast changing and slow changing signals.  The analog bandwidth varies over measurement ranges from 10 kHz (nA currents) up to 90 kHz (uA-mA currents).

RMS uncertainty on position data is evaluated on the fast data streams and on the low data streams (see table below). A typical temperature drift is measured approximately 10 nm/°C.

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
User Interfaces

The instrument runs on a Libera BASE software infrastructure. The infrastructure supports various plugins (interface servers) that are compatible with most common control system interfaces on users’ side:

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

Graphical user interface for TANGO users is built by the AtkPanel tool automatically. EPICS users have various options: from EDM, caQtDM to CSS.

As an example, the gallery below shows the GUI panels built on the caQtDM technology.

  • Main panel with general overview
  • Channel scaling and offset correction
  • Position calculation settings
  • Buffer with raw ADC data (channels)
  • Postmortem settings and buffer readout
  • Timing settings and triggering
  • GbE link configuration
  • IIR filter coefficients' setting example

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    Libera Photon
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    Preliminary test of XBPM local feedback in TPS
    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:

    • ALBA – Consortium for the Exploitation of the Synchrotron Light Laboratory (CELLS), Spain
    • ANKA – Karlsruhe Institute of Technology – Forschungszentrum Karlsruhe (KIT-FZK), Germany
    • APS – Argonne National Laboratory (ANL), USA
    • Australian Synchrotron – Australian Synchrotron, Australia
    • BEPC II, HEPS – Institute of High Energy (IHEP), China
    • BESSY II – Helmholtz-Zentrum Berlin, Germany
    • CHESS – Cornell University, USA
    • CIAE – China Institute of Atomic Energy (CIAE), China
    • CLS – Canadian Light Source Inc. (CLS), Canada
    • CSR – Institute of Modern Physics Chinese Academy of Sciences (IMP-CAS), China
    • Diamond Light Source – Diamond Light Source, United Kingdom
    • HiSOR – Hiroshima Synchrotron Radiation Center, Japan
    • KEK PF – The High Energy Accelerator Research Organization-KEK, Japan
    • LS-CAT – Northwestern University, USA
    • MAX IV – Lund University, Sweden
    • PLS II, HLS/HLS II, NSLS II – Pohang Accelerator Laboratory (PAL), South Korea
    • SER-CAT – The university of Georgia (UGA), USA
    • SLS – Paul Schrerrer Institute (PSI), Switzerland
    • SOLARIS – Jagiellonian University Krakow, Poland
    • SSRF – Shanghai Synchrotron Radiation Facility (SINAP), China
    • Synchrotron Soleil – Synchrotron SOLEIL, France
    • TLS, TPS – National Synchrotron Radiation Research Center (NSRRC), Taiwan

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