16:37:48 From FAICAL BARZI To Everyone: In the context of the Hubble tension between the predictions of standard model from large red shift and the SH0ES small red shifts hints to a "hierarchical" dark matter that is its behaviour is scale dependent 16:42:30 From Ketevi Adikle Assamagan To Tien-Tien Yu(Privately): Hi Tien-Tien, please upload your slide on the agenda or email them to me, thanks 16:43:16 From Tien-Tien Yu To Ketevi Adikle Assamagan(Privately): Hi Kétévi, I am here. I as a little confused about the timezone. Am I talking in a few minutes or in 1 hour? 16:43:39 From Ketevi Adikle Assamagan To Tien-Tien Yu(Privately): Yes, you are the next speaker. We are running a bit late. 16:44:24 From Tien-Tien Yu To Ketevi Adikle Assamagan(Privately): Ok! I will upload my pdf, but will share my screen for the talk. 16:44:34 From Ketevi Adikle Assamagan To Tien-Tien Yu(Privately): Ok thanks 16:57:26 From FAICAL BARZI To Everyone: Question: In the context of the Hubble tension between the predictions of standard model from large red shift and the SH0ES small red shifts hints to a "hierarchical" dark matter that is its behaviour is scale dependent 17:07:10 From FAICAL BARZI To Everyone: To Prof Yu: I'm always confused by this : What force us to postulate a missing Matter? is only because it interacts gravitaionally shouldn't we abide by the observation and say that something generates a stress-tensor but not necessary matter also it could be an emergent property of the already existing sectors? 17:33:14 From FAICAL BARZI To Everyone: Thanks a lot Prof Yu 17:34:06 From Lott Frans To Everyone: To Prof You: You mention the DM should interact gravitationally, what about blackholes within our galaxy and within the universe as a candidate?Don’t give off light, and have mass. Thanks 17:34:23 From USHIE Patrick To Everyone: thank you very much Prof Yu 17:35:10 From Tien-Tien Yu To Everyone: There are some mass ranges where primordial black holes can be the dark matter, but they are fairly constrained. Most options don’t allow these PBH to be ALL of DM b/c of various measurements, e.g. lensing 17:37:28 From FAICAL BARZI To Everyone: That's very interesting Prof Yu thank you very much. 17:51:29 From Sanae Samsam To Everyone: The roundtable discussion about LS in Africa will start in 10 min. We apologize for the late 17:52:15 From nutarelli To Everyone: ok thnks not problem. 17:56:21 From FAIÇAL BARZI To Everyone: what is r_s in the distribution model? 17:59:42 From FAIÇAL BARZI To Everyone: Nice presentation thanks 18:01:12 From FAIÇAL BARZI To Everyone: Schawrzschild radius? 18:05:05 From Christoph Quitmann To Everyone: Hello, this is Christoph Quitmann and I am very happy to be part of this Event. I look forward to discussing the potential of an African Light Source for science and commerial capacity building as well as pan-african and international collaboration. 18:05:45 From USHIE Patrick To Everyone: very interesting 18:07:23 From Lawrence Norris To Everyone: Check out www.africanlightsource.org and to participate in our next conference, which will be 13-17 November, please go to conference.africanlightsource.org 18:08:58 From Lawrence Norris To Everyone: Also for a workshop on this talk's exact topic --> ari-workshop.africanlightsource.org 18:09:19 From Charlie Wood To Everyone: Hi, it would be interesting to learn which applications are intended for a regional compact light source, and how the design of a CLS is being considered for those specific applications. 18:13:03 From Lawrence Norris To Everyone: CLS machines are to zeroth order just as generally applicable as storage-ring based light sources. The major issues however are flux on sample (brightness, brilliance, or however you want to define that), coherence of the light, and time-resolution. Overcoming these issues are matters of active research in AMO, magnets, and optics/photonics research. 18:15:10 From Hywel Owen - STFC UKRI To Everyone: Is Lyncean still offering a commercial CLS? I thought they were not any more. 18:19:27 From Lawrence Norris To Everyone: Lyncean is no more. But the individual are still around. And their one customer, Technical University of Munich, is still operating its machine. 18:19:58 From Lawrence Norris To Everyone: Munich is MuCLS 18:21:50 From Hywel Owen - STFC UKRI To Everyone: What is the consensus opinion of the bandwidth goal at 30 keV? 18:24:24 From Hywel Owen - STFC UKRI To Everyone: Not yet! 18:24:34 From Hywel Owen - STFC UKRI To Everyone: Yes! 18:39:55 From Christoph Quitmann To Everyone: Congratulations, good to see 1st beam coming out of this innovative source. 18:45:37 From nutarelli To Everyone: We are very happy for the results!! 18:46:56 From Hywel Owen - STFC UKRI To Everyone: Dear All, in the interests of time I did not show the later slides which show example science areas, but they are similar to sorts of techniques used at other sources. 18:48:04 From Hywel Owen - STFC UKRI To Everyone: These slides are available on the Indico 18:51:12 From Hywel Owen - STFC UKRI To Everyone: Some people imagine having coherent Compton scattering, but it seems extremely difficult to achieve. 18:52:58 From Hywel Owen - STFC UKRI To Everyone: Our UK 1st workshop on CLS Grid science areas is here: https://www.eventbrite.co.uk/e/compact-light-source-grid-life-science-cultural-heritage-opportunities-tickets-700245782987 18:53:18 From Kory Faye To Everyone: Well received and thanks 18:56:53 From Sanae Samsam To Everyone: Thank you Daniele Thank you Hywel 18:57:23 From Hywel Owen - STFC UKRI To Everyone: We did a paper recently looking at replacing medium-energy synchrotrons with Compton sources: https://journals.aps.org/prab/abstract/10.1103/PhysRevAccelBeams.24.050701 - that analysis is of course in agreement with what Luca said in his talk. 18:58:01 From nutarelli To Everyone: With pleasure. Thank to all organizer 18:58:18 From Christoph Quitmann To Everyone: Dont Forget, if you want to do X-ray microscopy, then there are also Commercial x-ray microscopes. These use micro-focus X-ray tubes, or liquid metal Jet x-ray Sources. They are off the shelf and would be complementary to an Inverse Compton Source. This would be helpful if thinking in Terms of a Network of complementary Sources on the african continent. 19:00:20 From Lawrence Norris To Everyone: Are those sources only good for microscopy? 19:01:16 From Lawrence Norris To Everyone: There is also easyXAFS for spectroscopy purposes https://www.easyxafs.com/ 19:01:58 From Christoph Quitmann To Everyone: Not only, they can also do diffraction, but not spectroscopy. I think one Needs to look at the whole science case and think of a Network of several sources in different Locations/countries. 19:06:35 From Hywel Owen - STFC UKRI To Everyone: I think Lawrence has just presented some of our user case here in the UK! 19:07:23 From Lawrence Norris To Everyone: Yes. And you don't even have to get sample through customs. I have a whole notebook full of customs horror stories. 19:09:51 From Martin Dierolf To Everyone: We talked to crystallographers (here on-campus) early on, but they were not / not that interested. Of course, this is only a small sample. Our collaborators from chemistry with whom we did the XANES where however quite happy (actually, they have an easyXAFS system as mentioned earlier, but the silver edge is too high in energy for this system / its optimal energy range is lower). 19:11:00 From Lawrence Norris To Everyone: I envision a CLS machine having actual clinical services duty-cycles, in which case the facility could conceivably amortize its cost in a few years. 19:13:29 From Hywel Owen - STFC UKRI To Everyone: Another axis of consideration that we haven't mentioned yet is sustainability. This is very important in future sources regardless of where they are built. 19:15:17 From Lawrence Norris To Everyone: We need to reprise this session somehow at Optics & Photonics Africa 2023, 6 - 10 November 2023 opa2023.com 19:15:53 From Diouma Kobor To Everyone: Sustainability and innovated CLS by making as autonomous as possible in energy consumption using RE and also the availability of Human resources 19:16:06 From Hywel Owen - STFC UKRI To Everyone: Yes, agree very very much 19:16:07 From Lawrence Norris To Everyone: The AfLS and the African Laser Centre can/should work together on an CLS optics/photonics school 19:16:54 From Lawrence Norris To Everyone: Website under new construction, but this is the African Laser Center https://africanlasercenter.org/ 19:17:00 From Massimo Placidi To Everyone: Many thanks to everybody