1. First birds’ flyInstituteCity, Country Namedistance [Km]Accelerator Yingbing9329SSRFShanghai, China Om6227 Igor6227NSLS-2Brookhaven, USA Yuke6227 Frank 980 Gero 980PETRA-3Hamburg, Germany Igor 980 Michael 893DLSDidcot, UK Peter 718DELTADortmund, Germany Stefano 630ELETTRATrieste, Italy Andrej 620InstrumentationSolkan, Slovenia Peter 620Technologies Angel 508ALBABarcelona, Spain Nicolas 484SOLEILParis, France ____ + 35525 Km !!

2. Libera Users’ meetings (~1.5 days) : SOLEIL, Paris, July 2007 ALBA, Barcelona, April 2008 ESRF, Grenoble, June 2009 Libera Workshops (2-3 days) organized by I-Tech in Slovenia : Autumn 2006 Autumn 2007 Autumn 2008 Autumn 2009 practical sessions, presentations of products, user’ presentations, some discussions

3. The meeting's main purpose is to : exchange relevant information, experience and knowledge of mutual interest on the practical use of the Liberas for Orbit measurement and Orbit stabilization in a large accelerator complex. a BPM system serves basically 3 goals : -1- providing position data of low latency & high rate (10KHz), in a very reliable manner, to a system for global orbit stabilization purposes, thereby stabilizing the User's photon beams -2- providing detailed info on the electron beam characteristics that can be extracted from a BPM station, thereby satisfying the requirements for detailed beam dynamics studies -3- providing a reliable Interlock on excessive beam displacements

4. for probably the first time in the history of accelerators, a major component, i.e. the BPM system, in these different accelerators is now being realized by an identical system : the Libera So : the various users of this Libera system should continue to exchange their experiences and continue to think of possible improvements

5. But are our BPM systems really identical, or even similar ?? Libera Control Feedback or Orbit- Stabilizer firmware release device server fast links Electron Brilliance 1.4, 1.6 1.8, 2.0, 2.2, … Epics Tango Tina different versions C.C. F-Eth. TbT ‘gentle’ (CW) ‘nasty’ fillings protection for peak voltages

6. ALBADLSELETTRAESRF PETRA- 3 SOLEILDELTA release presently used1.82 1.46 + 1.82- FPGA1.822.031.8 1.82 + mod. FPGA1.46 the Libera Users are a ‘diverging’ community.... What about future versions... ? small questionnaire on firmware versions :

7. 15:45Coffee 16:00 Discussions on specific subjects : Interfacing to control & computer system 16:25 Possible detailed beam studies with the Liberas 16:50 Issues surrounding feedback & stabilization systems 17:15 Further improvements, upgrading to new releases 17:40 Reliability & fail-proof issues 18:00End of first day of talks 19:30Dinner at 'Le Moderne' restaurant, Grenoble

8. tomorrow’s program (9-12am) of using our Storage Ring and the 224 Liberas for measuring & demonstrating certain features, beam behaviour, etc. We can : fill the machine with 2 extremely different fill patterns : e.g. pure single bunch & uniform fill (all 992 bunches filled) look at ADC, DD and SA data, at both Sum and Position values, while switching on-off our present fast feedback system while decaying, and/or ramping-up, while kicking the beam, shaking the beam, while changing Libera setting & parameters (DSC, gain, offset-tune, switching-delay, trigger-delays, time-phase, etc.) We can even intervene on the hardware if requested …. Please give your input

9. We can : Fill (filling pattern 7/8 ?) Look at SA data all BPMs : - fast feedback is ON : change gaps - fast feedback is OFF : change gaps  the effect of our feedback, also its limitation (due to limited N steerers) Look at SA data all BPMs : - then fix all Liberas to an attenuator setting - change that attenuator setting (drastically)  See the effect on position measurement (look at some good & bad ones) Do shot-by-shot filling : Look at DD data, sum & position Fill 16 bunch : - change the switching delay parameter Look at DD data : Spike amplitudes Look at SA data : position measurement variations

10. 09:00 Pascal Elleaume [ESRF] Welcome 09:05Kees Scheidt [ESRF]Short introduction to the Libera Users’ meeting 09:15Gero Kube [DESY] Experience of Liberas during PETRA-3 commissioning 09:40Kees Scheidt [ESRF] Commissioning experience of full new BPM system for SR 10:05Francis Epaud [ESRF] Tango based control system for the SR Libera BPMs 10:20Further questions & discussions........ 10:45Coffee