First birds’ fly Institute City, CountryName distance [Km] Accelerator

Yingbing 9329 SSRF Shanghai, China

Om 6227Igor 6227 NSLS-2 Brookhaven, USAYuke 6227

Frank 980Gero 980 PETRA-3 Hamburg, GermanyIgor 980

Michael 893 DLS Didcot, UK

Peter 718 DELTA Dortmund, Germany

Stefano 630 ELETTRA Trieste, Italy

Andrej 620 Instrumentation Solkan, SloveniaPeter 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 ??

LiberaControl

Feedbackor Orbit-Stabilizer

firmwarerelease

deviceserver

fast links

ElectronBrilliance1.4, 1.6

1.8, 2.0,2.2, …

EpicsTangoTina

differentversions

C.C.F-Eth.TbT

‘gentle’ (CW)‘nasty’ fillings

protection forpeak voltages

ALBA DLS ELETTRA ESRFPETRA-

3SOLEIL DELTA

release presently used 1.82

1.46 + 1.82-FPGA 1.82 2.03 1.8

1.82 + mod. FPGA 1.46

the Libera Users are a ‘diverging’ community . . . .

What about future versions . . . ?

small questionnaire on firmware versions :

15:45 Coffee

16:00Discussions 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

18:00 End of first day of talks

19:30 Dinner at 'Le Moderne' restaurant, Grenoble

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 amplitudesLook at SA data : position measurement variations

09:00 Pascal Elleaume [ESRF] Welcome

09:05 Kees Scheidt [ESRF] Short introduction to the Libera Users’ meeting

09:15 Gero Kube [DESY]Experience of Liberas during PETRA-3 commissioning

09:40 Kees Scheidt [ESRF]Commissioning experience of full new BPM system for SR

10:05 Francis Epaud [ESRF]Tango based control system for the SR Libera BPMs

10:20 Further questions & discussions . . . . . . . .

10:45 Coffee