Libera Users' Meetings and Workshops for BPM System Exchange

First birds’ fly Institute City, Country Name distance [Km] Accelerator Yingbing 9329 SSRF Shanghai, China Om6227 Igor 6227 NSLS-2 Brookhaven, USA Yuke 6227 Frank 980 Gero 980 PETRA-3 Hamburg, Germany Igor 980 Michael 893 DLS Didcot, UK Peter 718 DELTA Dortmund, Germany Stefano 630 ELETTRA Trieste, Italy Andrej 620 Instrumentation Solkan, Slovenia Peter 620 Technologies Angel 508 ALBA Barcelona, Spain Nicolas 484 SOLEIL Paris, France ____ + 35525 Km !!

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

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

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

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

small questionnaire on firmware versions : the Libera Users are a ‘diverging’ community . . . . What about future versions . . . ?

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

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

Libera Users' Meetings and Workshops for BPM System Exchange