DEELS - Diagnostics Experts of European Light Sources

Virtual Event

Virtual Event

Mario Ferianis (Elettra Sincrotrone Trieste), Ubaldo Iriso

June, 16th 2020


On last Tuesday, June 16th, the 7th edition of the DEELS workshop has been held “virtually” at Elettra. The DEELS series is a workshop where the diagnostics community meets to present new developments and to discuss common issues and enhance synergies between the various Laboratories.           
Due to the Covid-19, the event has been held on line adopting the ZOOM platform. A total number of 57 registered participants has been reached, by far higher than any previous edition. Two sessions have been set-up, each one with 4 talks. Discussion breaks have been provided between talks to give enough room for Q&A which is one of the main characteristics of the DEELS series.

Definitely, the worldwide COVID emergency has disclosed new opportunities to perform joint work together while been apart. This is, in general, an ECO/GREEN approach to our job which nowadays we do need, in this world.

DEELS 2020, the 7th edition of the Series, took full advantage from these new tools, and in fact it was possible to share, in one day, 8 technical contributions in a most enjoyable and interactive way. The quality of the presentation was very good and also the audio/ video quality has been at a very high level.

We would also like to thank all the Colleagues who lively participated to this on-line Event; almost 50 Colleagues joined this first on-line Event, confirming the strong interest for the initiative and the effective need to join and share our work and experiences.

Keeping in touch the people from the Community is a very important objective; we have been always collaborating between Labs and the large number of younger Colleagues, a part of whom joined us today, deserve the highest effort to feel part of the Community like we did.

Wishing you all the best,
DEELS 2020 Committee


Friday 12 June update

DEELS2020 TimeTable is available.

We will begin the virtual workshop on Tuesday 16 June, at 9.30 am (CEST - GMT + 2). We will have eight presentations and 20 minutes for each presentation for discussion. The scheduled time for the end of the workshop is 17:00 (5:00 pm).
The DEELS2020 virtual workshop will be on the Zoom platform and the connection credentials will be sent to the participants' e-mail address.
The workshop will not be recorded. All presentations will be available for download after the end of the event.

Some technical details/suggestions:

  • Since there are a lot of participants, please keep the microphone off while you are not speaking.
  • If possible, connect your PC to the Internet via cable: WiFi sometimes suffers from small interruptions in the data flow, even for seconds.
  • If your connection isn't stable and/or the connection bandwidth is small, consider to turn off your video sharing to spare data and have more bandwidth to see and hear the presentations.
  • If possible, use a small headset instead of PC speakers: when speaking your voice will be clearer since the anti-echo filter in this condition is automatically inactive.
  • Consider the illumination, preferring the light in front of you.

For any question, do not hesitate to contact us!

Nevertheless, we remind that the online Libera Worskhop will be held on the next day, Wednesday 17th June. Information and registration here:

Wishing you all the best,
DEELS 2020 Committee




Monday 27 April update

Dear colleagues,

given the many positive responses to the virtual event proposal, it was decided to host DEELS 2020 as a virtual workshop.
It will be an opportunity to maintain contacts between machine diagnostics experts in this particularly critical time.

So, DEELS2020 will be virtually held on Tuesday, 16th June, 9.30 to 13:00 (CEST - GMT+2), extending it to the afternoon (14:30-18:30) if needed.

In order to facilitate the scheduling, we encourage you to register for the event and to present the abstracts using the Indico framework in the DEELS2020 page.

The deadline is Monday, 8th June. The scheduled time for every contribution will be approximately 20 minutes without Q&A: there will be Q&A sessions, at the end of each session.

The technical details about the event will be published in due time, one week before the event.
Any other relevant information will be posted on DEELS web pages.

Nevertheless, we remind that the online Libera Worskhop will be held on the next day, Wednesday 17th June. Information and registration here:

Wishing you all the best,
DEELS 2020 Committee


Thursday 09 April 2020 update:

Dear Colleagues,

due to the current, not easy to forecast, CV-19 situation, we have decided to postpone DEELS 2020 to 2021, same period.

Still, in order to have a "diagnostic event" in this 2020, we are asking you whether you would like, and could be available to join us on, a "virtual" event (most probably, ZOOM based), on the Morning of June 16th, 9.00 to 12.30.

Please, also kindly let us know whether you would like to give a 20/30 minutes presentation by sharing your desktop with all Colleagues contacting us via email:

All relevant information will be posted in due time to the DEELS web pages.

Wishing you all the best,

DEELS 2020 Committee

Elettra Sincrotrone Trieste and ALBA  are pleased to announce the 7th Workshop of Diagnostics Experts of European Light Sources (DEELS), which will be held from 15-16 June 2020 at the Chamber of Commerce Venezia Giulia in Trieste downtown.

DEELS  is a yearly workshop where the diagnostics community gathers together to discuss common problems, share new developments, and enhance synergies between different facilities.

There is no registration fee for the workshop, but each participant's accommodation and transportation costs shall be covered by their home institute.

Please, note that, due to the logistics, the participant number is limited to 45. The queue will be managed on a "first in, first served" basis.

The registration deadline is set on June, 5th.

This year, the 2-days DEELS workshop will be followed by the Libera Workshop , organized by Instrumentation Technologies. It will take place in the same venue just after DEELS (17th June).

This year, DEELS is supported by the Work Package 8.4 called “Advanced Diagnostics for Accelerators” (ADA) within the ARIES network.

Links to previous DEELS editions:




  • Alan Tipper
  • Alexey Lyapin
  • Alun Morgan
  • Andreas Schälicke
  • Andriy Nosych
  • Basil Aljamal
  • Benoît Roche
  • Bertus Kees Scheidt
  • Borut Repic
  • Chris Bloomer
  • Cigdem Ozkan Loch
  • Claire Houghton
  • Daniel Tavares
  • David Yepez
  • Dima El Khechen
  • Dima El Khechen
  • Dirk Lipka
  • Ferianis Mario
  • Gabriele Benedetti
  • Gabriele Brajnik
  • Gero Kube
  • Giulio Gaio
  • Guenther Rehm
  • Guobao Shen
  • Gustavo Bruno
  • Hirokazu Maesaka
  • Hussein Al-Mohammad
  • James Safranek
  • jianshe cao
  • Johannes Steinmann
  • John Carwardine
  • Joseph Mead
  • Joseph Wolfenden
  • João Brito
  • Jørgen S. Nielsen
  • Kai-Oliver Demmler
  • Katarina Roškar
  • Kay Wittenburg
  • Laura Torino
  • Lorraine Bobb
  • Manuel Cargnelutti
  • Marco Lonza
  • marco veronese
  • Michael Abbott
  • Michele Carla'
  • Moussa El ajjouri
  • Nicholas Sereno
  • Nicolas HUBERT
  • Peter Leban
  • Raffaele De Monte
  • Richard Fielder
  • Romain Broucquart
  • Sergio Marques
  • Silvano Bassanese
  • Stefano Cleva
  • Weixing Cheng
  • Yanfeng Sui
  • Zeus Marti
    • 9:30 AM 9:50 AM
      DEELS2020 WELCOME 20m

      Introduction to DEELS 2020 virtual workshop

      Speaker: Mario Ferianis (Elettra Sincrotrone Trieste)
    • 9:50 AM 10:10 AM
      CIEL: Current Injection Efficiency and Lifetime 20m

      We will introduce a new acquisition system for storage ring beam current monitor.
      It is based on the co-developped PandBox electronics, associated with a 24 bits 128kS/s ADC.
      It offers the possibility of fast, triggered captures to measure injected current even during bursted injections.
      We'll show the results of the first tests and the integration of this new measure.

      Speaker: Romain Broucquart (SOLEIL)
    • 10:10 AM 10:30 AM
      Discussion and brief pause 20m
    • 10:30 AM 10:50 AM
      Results & experience with the 320 BPMs during the ESRF-EBS storage ring commissioning 20m

      We will show the results obtained with the 320 BPMs since the start of commissioning from end November till now,
      in terms of performance like stability, resolution, reliability,
      and for their different operation modes and required functioning.
      The preparation & calibration work done before the first beam injection will also be described and be compared with the final obtained results i.e. the minimization of initial offsets or inconsistent readings right from the very first injection.
      Results of beam-based-alignment will be presented, as well as the characteristics of the global EBS beam stability, with and without orbit correction.
      A few unexpected or surprising features will also be highlighted.

      Speaker: Benoît Roche (ESRF)
    • 10:50 AM 11:10 AM
      Discussion and brief pause 20m
    • 11:10 AM 11:30 AM
      Testing challenges for new BPM electronics 20m

      Longterm performance is one of the most important properties of the beam position electronics. Stability is not measured in micrometers over few hours anymore but over several days. The new BPM module was tested using "well known" testing setup but test results revealed unexplained drifts.
      Performance requirements, hardware implementation, optimization and testing cycles and results are presented in this talk.

      Speaker: Peter Leban (Instrumentation Technologies, d.d.)
    • 11:30 AM 11:50 AM
      Discussion and brief pause 20m
    • 11:50 AM 12:30 PM
      Challenges of the beam diagnostic system at cSTART 40m

      In the cSTART project, KIT (Karlsruhe Institute for Technology) will build a very large acceptance compact storage ring (VLA-cSR) aiming to demonstrate and examine the injection and the storage of a laser wakefield accelerated (LWFA) beam. As for the first operation phase, FLUTE (Ferninfrarot Linac- und Test-Experiment) will be used as an injector to the storage ring delivering an electron beam at 50 MeV energy. A design of the storage ring has been under development with a DBA-FDF lattice having the optical elements very close to each other, making insertion of beam diagnostics very challenging. Given the small ring circumference of 44 m, the revolution frequency of single electron bunches and the repetition rates of its diagnostics are very high in the order of 6.8 MHz, which require very fast electronics. Moreover, to be able to measure signals from bunch currents ranging between 20 pC to 1 nC, very sensitive beam diagnostics and with high dynamic range are required. Meanwhile, ideas of a preliminary beam diagnostic system are being considered and discussed. In this presentation, we will report on these ideas and appreciate suggestions and comments from the community present.

      Speaker: Dima El Khechen (Karlsruhe Institute for Technology)
    • 12:30 PM 12:40 PM
      Discussion 10m
    • 12:40 PM 2:00 PM
      Lunch pause 1h 20m
    • 2:00 PM 2:20 PM
      Development of an amplifier for XAPDs for bunch purity measurements 20m

      Bunch purity measurements are widely based on the technique of Time Correlated Single Photon Counting using an X-ray Avalanche Photo Diode (XAPD) as fast detector. XAPDs are advantageous because their dark count contribution can strongly be reduced by choosing an appropriate discriminator threshold in the counting system (see e.g. G.Rehm, DEELS 2014). There exist commercial systems based on 5x5 and 10x10mm^2 windowless APDs, using a pre-amplifier design which was developed some years ago at ESRF. However, the experience from PETRA III shows that bunch purity measurements with these large area detectors may be hampered by X-ray fluorescence caused by scattered background (see e.g. G.Kube, DEELS 2014). In order to reduce this background, in the future it is planned to use XAPDs with a smaller round active area with a diameter of 3mm. Hence and additionally driven by the interest from user’s side, the development of a dedicated fast but low cost XAPD pre-amplifier system was initiated. This presentation introduces the current status of the amplifier design.

      Speaker: Kai-Oliver Demmler (DESY)
    • 2:20 PM 2:40 PM
      Discussion and brief pause 20m
    • 2:40 PM 3:00 PM
      Fast Beam Based Alignment Using AC Corrector Excitations 20m

      Standard quadrupole beam-based alignment (BBA) techniques rely on
      orbit data and on the sequential variation of quadrupole and
      corrector magnets (CM). This results in time consuming measurements
      of the order of several hours. Fast (10
      kHz) beam position monitors (BPM) and CMs with ac power supplies are
      routinely used in modern synchrotron light sources to drive fast
      orbit feedback systems. In this paper we show how they can be
      employed to reduce the time for the BBA
      to several minutes only, ensuring the same level of accuracy and
      precision. Moreover, conversely to the standard BBA, the new
      procedure accounts automatically for any level of betatron coupling,
      BPM roll and OCM tilt. In the case of the ALBA 3rd generation light
      source, the time for a complete measurement dropped from 5 hours to
      10 minutes, a reduction by a factor 30. As further extension of this
      novel approach, an even faster skew quadrupole BBA was demonstrated
      in ALBA for the first time, taking advantage of the additional ac
      modulation of the skew quadrupole field. Results from this fully ac
      measurement are compared with those obtained via dc
      scan of the skew quadrupole.

      Speaker: Dr Zeus Marti (CELLS-ALBA)
    • 3:00 PM 3:20 PM
      Discussion and brief pause 20m
    • 3:20 PM 3:40 PM
      An interactive Tool to BPM design 20m

      A software tool to design and simulate stripline BPM for FERMI is presented. Developed in a LabVIEW environment, it's now under review to handle button BPM and different transverse profiles for the next ELETTRA 2 project. The first results are then compared to the one from BpmLab

      Speaker: Silvano Bassanese (Elettra Sincrotrone Trieste)
    • 3:40 PM 4:00 PM
      Discussion and brief pause 20m
    • 4:00 PM 4:20 PM
      Tracking Frequency Reference Phase Changes at Point of use based on BPM Measurements. 20m

      Multibunch Feedback systems in Diamond use the RF reference signal to sample the BPM signals. Uncertain reference phase variations due to upstream adjustments to the RF system previously necessitated regular manual realignment of the sampling phase. Locking the sampling phase to the measured beam phase has been investigated to improve the stability and robustness of the system and remove the dependence on absolute RF phase. Significant improvements have been achieved using a Beam Locked Loop architecture based on an IQ modulator and cartesian feedback to phase align the local 500MHz reference signal to the BPM RF frequency component under closed loop digital control with remote management via EPICS. The system has been successfully deployed on the storage ring at Diamond and has been operating live since October 2019. Live data captured from the operational storage ring demonstrates the ability to tolerate a wide variation in beam phase whilst maintaining accurate beam sampling and robust acquisition of the reference phase over the operating range of beam currents and fill patterns.

      Speaker: Mr Alan Tipper (Diamond Lightsource)
    • 4:20 PM 4:35 PM
      Discussion 15m
    • 4:35 PM 5:00 PM
      DEELS 2020 CONCLUSIONS 25m
      Speaker: Mario Ferianis (Elettra Sincrotrone Trieste)