DEELS 21- Diagnostics Experts of European Light Sources 2021

Wednesday 7 Jul 2021, 10:00 → 19:00 Europe/Zurich

Virtual- Webex Platform

Ubaldo Iriso, Hussein Al-Mohammad (SESAME)

SESAME is pleased to announce the 8th Workshop of Diagnostics Experts of European Light Sources (DEELS), which will be held as an online version on July 7th-8th, 2021.  

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, however; participants need to get registered in order to have access to the Webex online platform.

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

Links to previous DEELS editions:

• 2020, 7th DEELS @ Elettra (Virtual)
• 2019, 6th DEELS @ ESRF
• 2018, 5th DEELS @ DLS
• 2017, 4th DEELS @ SOLEIL
• 2016, 3rd DEELS @ DESY
• 2015, 2nd DEELS @ ALBA
• 2014, 1st DEELS @ ESRF

  

 

1 DEELS2021 WELCOME

Speaker: Hussein Al-Mohammad (SESAME)

DEELS21_Welcome_HAM1.pdf

DEELS21_Welcome_HAM1.pptx

2 Computer vision application for real-time beam tracking in pinhole image systems at Alba

During the last year we have installed and commissioned a second x-ray pinhole at ALBA for redundant and alternative beam size measurements. Here we report the issues we encountered and compare the ultimate PSF of both pinholes at ALBA. We also report on the first steps of a computer vision and machine learning application for pinhole beam diagnostics.
We have trained an artificial neural network to simultaneously detect, track and measure one or more beam images coming from the pinhole camera feed.

Speaker: Andriy Nosych (ALBA CELLS (ES))

DEELS_ML_pinhole_tracking.pdf

DEELS_ML_pinhole_tracking.pptx

10:35 Discussion

3 Photon Beam Diagnostics at SESAME

Multiple systems of photon diagnostics are adapted at SESAME, in order to measure beam size and to observe the beam profile in various positions. One of the systems is the In-Air X-ray Detector (IAXD), which primarily depends on high-exposure imaging of the residual high energy x-rays that escaped after the photon absorber on the ends of the bending magnet ports. In addition to that, the Synchrotron Radiation Monitor (SRM) has been implemented in two techniques, the first is simply direct imaging of the monitor, the second is to adapt the interferometry technique to acquire beam size measurement. Other than that, Pinhole imaging system is currently being designed to be installed at cell 15, to provide precise measurement of both vertical and horizontal beam sizes through fitting formula of the obtained images.

Speaker: Omar AL KAILANI (SESAME)

DEELS 2021.pdf

11:05 Discussion

11:15 Coffee Break

4 Results with the Visible Light diagnostics with EBS now in full User-service mode

Several Visible Light diagnostics have put in operation, more than 1 year after the start of the EBS commissioning. The Visible Light extraction system, with its first mirror in UHV and a chicaned transfer line, has been completely and optimally aligned to obtain distortion-free light in a dedicated laboratory at 9m from source point. This allowed to characterize this light in different means, and to then use it for bunch-length measurements with a Streak Camera. This for both the stored bunches in the Storage Ring and for the injected bunches, with the latter showing both their bunch-length and the longitudinally behaviour of that injected beam under different injection conditions.

Speaker: Elena Buratin (ESRF - European Synchrotron Radiation Facility)

DEELS2021_ Visible_Light_Diagnostics_EBS_Buratin_07072021.pdf

12:00 Discussion

5 Experience with Pilot-tone+Libera Spark at ALBA

A BPM calibration-readout system composed by a Libera Spark and a Pilot-tone generator has been installed at ALBA. In this talk, results on stability and position measurement will be reported. A comparison of performances between this readout system and other Libera Elettronics, will also be presented.

DEELS2021.pdf

12:30 Discussion

12:50 Lunch Break

6 SESAME in a Nutshell

A pre-recorded video for SESAME facility illustrating the main components and some of diagnostics instruments.

Speaker: Hussein Al-Mohammad (SESAME)

14:20 Discussion

7 Improvements of the bunch purity measurement at PETRA III

In this presentation the actual work on the bunch purity measurement at PETRA III will be reported. The system is based on small area XAPDs used as detector in a time correlated single photon counting measurement scheme. At first improvements of the analog electronics of the detector head will be shown. An introduction to the test setup and placement at the PETRA III storage ring and the specific characteristics will be given, too. At least we will have a look on the actual results and ideas for future improvements.

Speaker: Kai-Oliver Demmler (DESY)

Demmler_DEELS2021.pdf

14:45 Discussion

8 About XBPMs for SOLEIL upgrade

SOLEIL Synchrotron has an upgrade plan to replace its storage ring by a new one based on multi-bend (7/4BA) achromat lattice. To fulfil the new tight requirements, most beam diagnostics will have to be replaced, or at least refurbished and improved. Among them are the X-ray Beam Position Monitors (XBPMs). Located on each beamline front-end, they enable to measure the position of the photon beams before their delivery to downstream users. The present XBPMs rely on four tungsten or copper blades operated in photo-emission mode. We will present a brief state-of-the-art of the existing or under-study XBPM systems, summarize the limitations our systems are presently facing, and introduce our strategy for the upgrade.

Speaker: Marie labat

deels_20210705_labat_v01.pdf

15:15 Discussion

9 XBPM temperature interlocks for DLS-II

Synchrotron upgrades at Diamond Light Source and elsewhere are being undertaken to increase the X-ray brightness. A side effect of this is an increase in power that may be intercepted by X-ray beam diagnostics. Of particular concern are front end XBPMs, often the first component along the beam path. Diamond currently uses a temperature interlock to prevent damage to XBPMs in the event of a missteer. A PT100 monitors the temperature of a water-cooled copper aperture within the XBPM, and beam is dumped if the temperature exceeds a threshold value. However, it is well understood that using this single temperature sensor as a critical MPS component is unsatisfactory. Presented in this talk are our findings on the effectiveness and limitations of our existing front end XBPM interlocks. Diamond is aiming to re-use as much of the front end as possible after our machine upgrade, and entirely replacing our XBPM apertures and fitting additional temperature sensors is undesirable. We will also present our concepts for potential future interlock triggers, and will welcome input from DEELS on their experiences with similar problems.

Speaker: Chris Bloomer (Diamond Light Source Ltd.)

XBPM temperature interlocks for DLS-II - presentation.pdf

15:45 Discussion

10 Conclusions

Speaker: Hussein Al-Mohammad (SESAME)