Recent Posts

31

Need help? / Coupling Synchrotron Radiation into Fiber

« Last post by Johannes Steinmann on September 16, 2021, 09:34:17 AM »

Hi all,

in our booster we can't install a streak camera / beam line. So, we are thinking about coupling light from a view port into a fiber and transport it to the streak camera (~20m). Does someone have experience with coupling bending magnet radiation into a fiber? Which coupler to use, how to focus, which fiber, which frequency (range)?

I appreciate any suggestions.

Thanks,
Johannes

32

Need help? / Re: Microscope for X-ray imaging

« Last post by LorraineBobb on September 15, 2021, 05:30:43 PM »

Hi Cigdem,

I've used a reflective microscope with 25um LuAg in the pinhole camera, but beamsizes would be approx. (sigma_x, sigma_y) =(15um, 45um), 300mA beam, peak energy 25keV.
PERFORMANCE OF A REFLECTIVE MICROSCOPE OBJECTIVE IN AN X-RAY PINHOLE CAMERA, IBIC2018

A few thoughts:

Have you measured the MTF or PSF of the scintillator using a knife-edge? Beamlines tend to have decent targets for this.

Also have you verified the PSF from the optical system (microscope)? Just to sanity check how much PSF comes from the optics?

If you think it's an energy density issue on the scintillator, have you tried attenuating the X-ray beam or using low beam current?

Good luck! ;-)
L.

33

General Discussion / Re: BPM system in different institutes

« Last post by LorraineBobb on September 15, 2021, 05:11:18 PM »

Diamond Light Source
BPM System: 172 BPMs on storage ring (168 orginally); Libera Brilliance and Libera Electron
References: Performance of the FOFB with DDBA in Diamond Light Source, IPAC2017, TUPIK113
                  Diamond Light Source Electron Beam Position Feedback: Design, Realization and Performance, ICALEPCS2009, THB003
Comments:
For D-II, number of BPMs on storage ring increases to 252 and we intend to use pilot tone with analog front end in-tunnel and digital signal processing using mTCA platform in the Control and Instrumentation Areas [Diamond-II CDR ].

34

Announcements / Job: (Senior) Diagnostics Physicist/Engineer (10577) at Diamond Light Source, UK

« Last post by LorraineBobb on September 13, 2021, 03:12:20 PM »

Dear all,

I hope you are all keeping well and will have a fruitful IBIC’2021!

I’d like to let you know of the following position at Diamond Light Source, UK:

https://vacancies.diamond.ac.uk/vacancy/senior-diagnostics-physicist-engineer-448352.html

This role will define, design and deploy state-of-the-art custom RF instrumentation for world leading beam diagnostics. A key element of the role is the delivery of new diagnostics instrumentation for the future accelerator upgrade Diamond-II featuring RF design and characterisation, electronics design including PCB layouts, and developing prototypes to ensure suitability for production at scale.

Duties also include the maintenance, research and development of existing diagnostics instrumentation and feedback systems. Within this role, candidates will apply knowledge and do hands-on practical work in the lab, on the accelerator and beamlines.

Please feel free to share and apply.

Best regards,

Lorraine
Head of Diagnostics

35

Need help? / Re: Microscope for X-ray imaging

« Last post by cozkan on September 13, 2021, 11:34:01 AM »

Hi Friederike,

We didnt have any other way of checking the spot size but knowing the optics well, and having scanned the beam size we know where it stops measuring.
The depth of field of the imaging setup is sufficient and not smaller than the scintillator thickness.
I have considered the influence of the substrate (and literature informs me it is possible) but dont have the substrate separately to test, nor do I have the scintillator on a glass substrate.
Having spoken to Crytur, we think the scintillator is the bottleneck. Have decided to build an x-ray microscope and relax the imaging requirements, instead. Will test the x-ray micropscope hopefully this year.
Thanks for taking the time to respond.
Cheers,
Cigdem

36

Announcements / Invitation for IBIC 2021

« Last post by Changbum Kim on September 09, 2021, 11:48:54 AM »

Dear Colleagues,

On behalf of the organizing committee, I am pleased to invite you to the 10th International Beam Instrumentation Conference (IBIC 2021). This year we will have a virtual conference from September 13 to September 16 because of the COVID-19 pandemic. The homepage address is:

http://pal.postech.ac.kr/ibic2021

IBIC is a gathering of the world's beam instrumentation community and it reflects the maturity of international collaboration in the field of beam instrumentation for accelerators. IBIC is dedicated to exploring the physics and engineering challenges of beam diagnostic and measurement techniques for particle accelerators worldwide.

The conference program will include tutorials on selected topics, invited and selected talks, as well as poster sessions.

We warmly welcome you to make part of IBIC 2021 and look forward to seeing you online.

Changbum Kim,
IBIC 2021 Conference Chair

37

General Discussion / BPM system in different institutes

« Last post by Benoît Roche on September 08, 2021, 01:24:17 PM »

The idea of this topic is to make the most exhaustive list of the BPMs system in all institutes.

Please indicate what your BPM system is as a reply in this topic, and I will include it in the list.

Later, we could do the same kind of list for other systems (emittance monitors, bunch-by-bunch feedback, XBPM, ...), but for the moment let's start with the most wildly used system in storage rings.

ALBA
BPM system:	120 BPMs (Libera Brilliance) in the storage ring 44 BPMs in the booster, 24 of them are equipped with a Libera Brilliance. A few Libra Spark Single Pass for the Linac and transfer lines
References:	Upgrade of BPMs and SRMs for the ALBA Booster to Storage Ring transfer line, DEELS 2017 Commissioning of the ALBA Fast Orbit Feedback system, IBIC2014, WEPD23
Comments:	88 Libera Brilliance among the 120 used for fast orbit feedback to have squared matrix, since we have 88 correctors. Libera Brilliance are doing quite well after ~ 10 years operation but this year (2021) fans started to fail consistently and we decided to perform a full replacement campaign. Testing 2 Libera Brilliance+ and Libera Spark+Pilot-tone in some special BPMs. One BPM (the first after injection) is equipped with a Libera Spark Single pass and we use it for Linac to Booster injection efficiency measurements.
Diamond Light Source
BPM system:	172 BPMs on storage ring (168 orginally); Libera Brilliance + Libera Electron
References:	Performance of the FOFB with DDBA in Diamond Light Source, IPAC2017, TUPIK113 Diamond Light Source Electron Beam Position Feedback: Design, Realization and Performance, ICALEPCS2009, THB003
Comments:	For D-II, number of BPMs on storage ring increases to 252 and we intend to use pilot tone with analog front end in-tunnel and digital signal processing using mTCA platform in the Control and Instrumentation Areas [Diamond-II CDR ].
ESRF
BPM system:	192 Libera Brilliances and 128 Libera Sparks ERXR (iTech) for the Storage Ring 75 Sparks for the Booster
References:	Strongly increased Performance and Functionalities of the ESRF BPMs with the Libera system (ESLS 2010) Complete Test Results of New BPM Electronics for the ESRF New LE-Ring (IBIC2018)
Comments:	SR Fast Orbit Feedback only using the 192 Brilliances (but work in progress to include the 128 Sparks)

38

Need help? / Re: Microscope for X-ray imaging

« Last post by Ewald on September 07, 2021, 05:27:57 PM »

Hi Cigdem,
some consideration that could maybe help you:
Are you sure that your X-ray spot size is smaller than 5um? Do you have the possibility to check this with another technique?
Have you checked the depth of field of your imaging setup? If it is not smaller than the scintillator thickness, there is no need to reduce the thickness.
Have you considered an influence of the substrate? X-rays could be absorbed by the substrate, reemit and generate fluorescence in the doped part further away from the primary spot?
Cheers,
Friederike

39

General Discussion / Re: Welcome

« Last post by Changbum Kim on September 06, 2021, 05:04:01 PM »

Thank you Benoit for your great job. I will make a link from the IBIC 2021 homepage to this forum.

In addition, it is really nice to meet you all. Hello.

40

General Discussion / Re: Welcome

« Last post by Nashat1985 on September 06, 2021, 09:27:40 AM »

Hi Benoit, hello to all members, it is my pleasure to join the beam diagnostic group wish you all the best ...😊