| Title |
Integration of a Pilot-Tone Based BPM System Within the Global Orbit Feedback Environment of Elettra |
| Authors |
- G. Brajnik, S. Bassanese, G. Cautero, S. Cleva, R. De Monte
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
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| Abstract |
In this contribution, we describe the advantages of the pilot tone compensation technique that we implemented in a new BPM prototype for Elettra 2.0. Injecting a fixed reference tone upstream of cables allows for a continuous calibration of the system, compensating the different behaviour of every channel due to thermal drifts, variations of cable properties, mismatches and tolerances of components. The system ran successfully as a drop-in substitute for a Libera Electron 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 (at 10 kHz data rate) for the pilot tone position was less than 200 nm on a 19 mm vacuum chamber radius, with a long-term stability better than 1 um in a 12-hour window. 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.
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| Paper |
download TUOC01.PDF [6.666 MB / 6 pages] |
| Slides |
download TUOC01_TALK.PDF [6.468 MB] |
| Export |
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| Conference |
IBIC2018 |
| Series |
International Beam Instrumentation Conference (7th) |
| Location |
Shanghai, China |
| Date |
09-13 September 2018 |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editorial Board |
Volker RW Schaa (GSI, Darmstadt, Germany) |
| Online ISBN |
978-3-95450-201-1 |
| Received |
31 August 2018 |
| Accepted |
13 September 2018 |
| Issue Date |
29 January 2019 |
| DOI |
doi:10.18429/JACoW-IBIC2018-TUOC01 |
| Copyright |
 Published by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI. |
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