18-19 April 2018
Diamond Light Source
Europe/London timezone
Diagnostics Experts of European Light Sources

Integration of a novel BPM system within the global orbit feedback environment of Elettra

18 Apr 2018, 15:30
G59 (Diamond Light Source)


Diamond Light Source

Diamond House, Harwell Campus, Didcot, OX11 0DE, United Kingdom


Dr Gabriele Brajnik (Elettra - Sincrotrone Trieste) Raffaele De Monte (Elettra - Sincrotrone Trieste)


A new-concept BPM was developed to prove the usefulness of pilot tone technique in channels equalization, thermal drift compensation and self-calibration.
It ran successfully not only during various machine shifts, but also during a user dedicated beamtime shift for more than 10 hours, behaving in a transparent way for all the control systems and users. The equivalent RMS noise (10 kHz data rate) for the pilot tone position was less than 200 nm on a 20 mm vacuum chamber radius.
Two main steps led to this important result: firstly, the development of a novel RF front end that adds the pilot tone to the signals originated by the beam, secondly, the realisation of an FPGA-based double digital receiver that demodulates both beam and pilot amplitudes, calculating the compensated X and Y positions.
We successfully tested our system as a drop-in substitute for Libera Electron systems, by placing our front end inside the machine tunnel, connected on one side to the button BPMs of a section normally used by a Libera, and on the other side to the digital receiver. We also demonstrated seamless communication via Ethernet interface with the global orbit feedback and Tango control systems.

Primary authors

Dr Gabriele Brajnik (Elettra - Sincrotrone Trieste) Raffaele De Monte (Elettra - Sincrotrone Trieste)


Silvano Bassanese (Elettra - Sincrotrone Trieste) Giuseppe Cautero (Elettra - Sincrotrone Trieste) Stefano Cleva (Elettra - Sincrotrone Trieste)

Presentation Materials