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Re: [SPAM] Re: Draft of SPIE proceeding
by haffert＠strw.leidenuniv.nl 17 Jul '26

17 Jul '26

Hi Caroline and Maud, Your comments have been incorporated into the manuscript. I will send another version of the proceedings around after lunch. Sebastiaan From: maud.langlois(a)univ-lyon1.fr <maud.langlois(a)univ-lyon1.fr> Sent: Friday, 17 July 2026 10:55 To: pcs-wp2(a)strw.leidenuniv.nl; haffert <haffert(a)strw.leidenuniv.nl>; Potier Axel <axel.potier(a)obspm.fr> Subject: Re: [Pcs-wp2] Re: [SPAM] Re: Draft of SPIE proceeding Hello Sebastiaan and Axel, Thanks for sharing the proceeding. I rapidly went through and it reads well. Could you include the folowing ackowledgement combine with the one sent by Caroline. "This work has been supported by PEPR Origins, funded by France 2030 investment plan and operated by the French Research National Agency, grants No. ANR-22-EXOR-0002 and ANR-22-EXOR-0017." Cheers Maud Le 17/07/2026 à 01:17, Caroline KULCSAR a écrit : Hi Axel, No problem, thanks for your fast reply and for taking care of the modifications! Somewhere in Section 4.1 and/or in Section 4.2.5 could you adequately mention post-AO control? I would prefer to leave it to you to suggest the wording, as I wouldn’t feel entirely comfortable doing so. Also, I propose to modify the sentence just above section 5: "Ultimately, this shift towards data-driven prediction complements and builds upon foundational conventional control techniques, such as the Kalman filter, which similarly utilize temporal state estimation to mitigate the deterministic lag inherent in wavefront correction loops.80, 81", into: * "Ultimately, this shift towards data-driven prediction complements and builds upon foundational conventional control techniques, such as the LQG regulator and its Kalman filter, which similarly utilize temporal state prediction to mitigate the deterministic lag inherent in wavefront correction loops.80, 81" with reference 80 replaced by this one: @article{Sinquin2020, author = {Sinquin, Baptiste and Prengère, Léonard and Kulcsár, Caroline and Raynaud, Henri-François and Gendron, Eric and Osborn, James and Basden, Alastair and Conan, Jean-Marc and Bharmal, Nazim and Bardou, Lisa and Staykov, Lazar and Morris, Tim and Buey, Tristan and Chemla, Fanny and Cohen, Matthieu}, title = {On-sky results for adaptive optics control with data-driven models on low-order modes}, journal = {Monthly Notices of the Royal Astronomical Society}, volume = {498}, number = {3}, pages = {3228-3240}, year = {2020}, month = {11}, doi = {10.1093/mnras/staa2562} } And finally, the funding sentence for our activities in PCS: "This work has been supported by PEPR Origins-UPCAO project, funded by the French Research National Agency (France 2030 investment plan), grant No. ANR-22-EXOR-0017." Thanks again and I wish you all a nice summer time, Caroline _____ De : Axel Potier <mailto:axel.potier@obspm.fr> <axel.potier(a)obspm.fr> Envoyé : jeudi 16 juillet 2026 23:16 À : Caroline KULCSAR <mailto:caroline.kulcsar@institutoptique.fr> <caroline.kulcsar(a)institutoptique.fr> Cc : Sebastiaan Haffert <mailto:haffert@strw.leidenuniv.nl> <haffert(a)strw.leidenuniv.nl>; pcs-wp2(a)strw.leidenuniv.nl <mailto:pcs-wp2@strw.leidenuniv.nl> <mailto:pcs-wp2@strw.leidenuniv.nl> <pcs-wp2(a)strw.leidenuniv.nl> Objet : Re: [SPAM] [Pcs-wp2] Re: Draft of SPIE proceeding Hi Caroline, I believe Sebastiaan was not aware of your team's participation in WP2.3, which is entirely my fault. I did not pay enough attention to the author list. Of course this work is more than valuable to PCS and I hope those discussions will resume after the summer break :-) . I add you all in the author list. Please let us know if you have any other comments on the proceedings, Sorry again for the oversight, Best, Axel Le 16 juil. 2026 à 23:06, Caroline KULCSAR <mailto:caroline.kulcsar@institutoptique.fr> <caroline.kulcsar(a)institutoptique.fr> a écrit : Hi Sebastiaan, The work I've mentioned is this one: \inproceedings{Harkat2026, title = {{Predictive control for the compensation of NCPAs measured with SPHERE/ZELDA}}, author = Harkat, Aya and Raynaud, Henri-Fran\c{c}ois and Galland, Nicolas and Vigan, Arthur and Potier, Axel and N'Diaye, Mamadou and Dohlen, Kjetil and Kulcs\'ar, Caroline}, year = 2026, month = {June}, booktitle = {SPIE Conference on Astronomical Telescopes and Instrumenation}, editor = { Kathryn J. Jackson, Dirk Schmidt, Elise Vernet }, organization = {SPIE} } Thank you, Caroline _____ De : Caroline KULCSAR <caroline.kulcsar(a)institutoptique.fr <mailto:caroline.kulcsar@institutoptique.fr> > Envoyé : jeudi 16 juillet 2026 22:45 À : haffert(a)strw.leidenuniv.nl <mailto:haffert@strw.leidenuniv.nl> <haffert(a)strw.leidenuniv.nl <mailto:haffert@strw.leidenuniv.nl> >; pcs-wp2(a)strw.leidenuniv.nl <mailto:pcs-wp2@strw.leidenuniv.nl> <pcs-wp2(a)strw.leidenuniv.nl <mailto:pcs-wp2@strw.leidenuniv.nl> > Objet : RE: [Pcs-wp2] Draft of SPIE proceeding Dear Sebastiaan, Aya Harkat, Nicolas Galland and myself have worked with Henri-François on the data provided by Axel and Arthur in the framework of WP2, as I had proposed at one of these meetings to study the potential of predictive control for post-AO residuals. Could you please add us three in the authors' list? Thank you, Caroline PS: I'm currently at the EAOSS (summer school) and could not read your email until this evening. _____ De : haffert(a)strw.leidenuniv.nl <mailto:haffert@strw.leidenuniv.nl> <haffert(a)strw.leidenuniv.nl <mailto:haffert@strw.leidenuniv.nl> > Envoyé : jeudi 16 juillet 2026 14:02 À : pcs-wp2(a)strw.leidenuniv.nl <mailto:pcs-wp2@strw.leidenuniv.nl> <pcs-wp2(a)strw.leidenuniv.nl <mailto:pcs-wp2@strw.leidenuniv.nl> > Objet : [Pcs-wp2] Draft of SPIE proceeding Dear all, Please find the attached SPIE proceeding for our work in WP2. Currently, authorship is based on either participation in the zoom meetings of WP2 or making contributions to the work in WP2. I will submit this tomorrow afternoon at 5 PM because I will away on vacation after that. Met vriendelijke groet / With kind regards, Dr. Sebastiaan Haffert Assistant professor Leiden Observatory, Leiden University Einsteinweg 55, 2333 CC, Leiden, The Netherlands _______________________________________________ Pcs-wp2 mailing list -- <mailto:pcs-wp2@mailman.strw.leidenuniv.nl> pcs-wp2(a)mailman.strw.leidenuniv.nl To unsubscribe send an email to <mailto:pcs-wp2-leave@mailman.strw.leidenuniv.nl> pcs-wp2-leave(a)mailman.strw.leidenuniv.nl _______________________________________________ Pcs-wp2 mailing list -- pcs-wp2(a)mailman.strw.leidenuniv.nl <mailto:pcs-wp2@mailman.strw.leidenuniv.nl> To unsubscribe send an email to pcs-wp2-leave(a)mailman.strw.leidenuniv.nl <mailto:pcs-wp2-leave@mailman.strw.leidenuniv.nl> -- Directrice de Recherche au CNRS Centre de Recherche Astrophysique de Lyon 9 Ave. Charles André 69561 Saint-Genis Laval, France Th: (00) 33 4 78 86 83 97 Email: maud.langlois(a)univ-lyon1.fr <mailto:maud.langlois@univ-lyon1.fr>

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Draft of SPIE proceeding
by haffert＠strw.leidenuniv.nl 16 Jul '26

16 Jul '26

Dear all, Please find the attached SPIE proceeding for our work in WP2. Currently, authorship is based on either participation in the zoom meetings of WP2 or making contributions to the work in WP2. I will submit this tomorrow afternoon at 5 PM because I will away on vacation after that. Met vriendelijke groet / With kind regards, Dr. Sebastiaan Haffert Assistant professor Leiden Observatory, Leiden University Einsteinweg 55, 2333 CC, Leiden, The Netherlands

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Re: WP2 PCS overleaf link
by haffert＠strw.leidenuniv.nl 09 Jul '26

09 Jul '26

Okay that went wrong. I accidently sent the email before finishing it. Here is the overleaf link: https://www.overleaf.com/4661613744fbwcjjhfjgwn#91e901 The sub-WP leads will have the responsibility for their sections. I added some basic bullet points for each section. We can discuss these of course. Best, Sebastiaan From: haffert(a)strw.leidenuniv.nl <haffert(a)strw.leidenuniv.nl> Sent: Friday, 24 April 2026 13:26 To: 'pcs-wp2(a)strw.leidenuniv.nl' <pcs-wp2(a)strw.leidenuniv.nl> Subject: WP2 PCS overleaf link Hi all, We decided today during the WP2.3 discussion that we will aim to have the SPIE proceeding done by June 17th. I prepared an overleaf document for all of us to work together. Met vriendelijke groet / With kind regards, Dr. Sebastiaan Haffert Assistant professor Leiden Observatory, Leiden University Einsteinweg 55, 2333 CC, Leiden, The Netherlands

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SPIE Poster for PCS WP2
by haffert＠strw.leidenuniv.nl 24 Jun '26

24 Jun '26

Hi all, I have adjusted the Spirit of Lyot poster a little bit by adding some recent results. I mostly kept the layout the same. Let me know if you have any comments. Met vriendelijke groet / With kind regards, Dr. Sebastiaan Haffert Assistant professor Leiden Observatory, Leiden University Einsteinweg 55, 2333 CC, Leiden, The Netherlands

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Meetings in June
by Axel Potier 12 Jun '26

12 Jun '26

Dear team, Friendly reminder for this month’s PCS WP2 meetings: - Tomorrow Friday June 4th from 10am to 11am: WP2.3 meeting. Agenda: - Presentation by Aya Harkat (« Predictive LQG control for the compensation of NCPAs measured with SPHERE/ZELDA » ) - Discussion on pupil stabilization. - Discussion on deformable mirrors: how many DMs? Distance from the pupil? Technology? - Writing of WP2 proceedings . - Friday June 12th from 11am to 12pm: WP2 general meeting. Agenda: - update on budget allocation and meeting with WP3+WP6 - update on the sub-work packages and their progress - update on SPIE proceedings See you there! Best, Axel

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Postdoc position on metasurface coronagraphs for HWO and PCS
by haffert＠strw.leidenuniv.nl 14 May '26

14 May '26

Hi all, I wanted to reach out about this postdoc position that I have available in Leiden since I have not advertised it that widely. It’s focused on the development of optical metasurfaces for coronagraphs for HWO and PCS https://jobs.strw.leidenuniv.nl/2026/HaffertPD/ . I would really appreciate it if you forwarded it to anyone that you know that would be interested in it. And sorry for everyone that already got this through other channels. Met vriendelijke groet / With kind regards, Dr. Sebastiaan Haffert Assistant professor Leiden Observatory, Leiden University Einsteinweg 55, 2333 CC, Leiden, The Netherlands

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IMPORTANT update about the PCS-CEP
by haffert＠strw.leidenuniv.nl 11 May '26

11 May '26

Hi all, I just finished migrating all the code to a new github repo to remove any traces of the original pupil generation script. This was a bit cumbersome. To keep the same name of pcs-cep, I migrated the repo to pcs-cep-old. That repo contains the pipeline as developed until now. Then I made a new repo pcs-aperture which contains purely the aperture generating functions. People within the consortium and that are part of the elt-pcs organization on github should be able to access that repo and install it. The new PCS-CEP code is in pcs-cep. This new repo tries to import the pcs-aperture library to create the aperture and if it is not found it will default to using the supplied fits files. This now works seamlessly and transparently. From the user perspective there is no difference. Your task: delete the old PCS-CEP repo if you have it on your computer and install the new one. This is necessary to completely purge all possibilities of accidentally adding the pupil generation script back into the code. Thanks for staying patient with me while I fixed this issue. Met vriendelijke groet / With kind regards, Dr. Sebastiaan Haffert Assistant professor Leiden Observatory, Leiden University Einsteinweg 55, 2333 CC, Leiden, The Netherlands

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Re: Next general meeting
by haffert＠strw.leidenuniv.nl 08 May '26

08 May '26

Hi everyone, I forgot to share a meeting link for today. Here is one: https://universiteitleiden.zoom.us/j/7267353069?pwd=JQ4pnKb14HkPby0v9XJqmcg… Sebastiaan From: haffert(a)strw.leidenuniv.nl <haffert(a)strw.leidenuniv.nl> Sent: Wednesday, 22 April 2026 17:50 To: pcs-wp2(a)strw.leidenuniv.nl Subject: Next general meeting Hi all, I propose we should have our next general WP2 meeting on Friday May 8th at 10:00. Agenda: * Coordination of removing the pupil generating function for external collaborators. * Sebastiaan will present the first draft of the opto-mechanical volume envelope. * Current state of the coronagraph design call. * Current state of the wavefront sensing sub-group. * Set goals for SPIE and what we will put on the poster. Met vriendelijke groet / With kind regards, Dr. Sebastiaan Haffert Assistant professor Leiden Observatory, Leiden University Einsteinweg 55, 2333 CC, Leiden, The Netherlands

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WP2 PCS overleaf link
by haffert＠strw.leidenuniv.nl 24 Apr '26

24 Apr '26

Hi all, We decided today during the WP2.3 discussion that we will aim to have the SPIE proceeding done by June 17th. I prepared an overleaf document for all of us to work together. Met vriendelijke groet / With kind regards, Dr. Sebastiaan Haffert Assistant professor Leiden Observatory, Leiden University Einsteinweg 55, 2333 CC, Leiden, The Netherlands

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Re: WP2.3 literature review and next meeting
by Axel Potier 23 Apr '26

23 Apr '26

Dear all, Friendly reminder for our PCS WP2.3 meeting that will take place tomorrow from 10am to 11am (see zoom link below). Here is a tentative meeting plan: - Presentation from Jalo about fast & furious concept associated to RL. - Open discussion about best criteria to downselect the WS&C architectures we have discussed so far. - Discussion regarding the next steps toward the common WP2 SPIE proceedings, and beyond. See you there, Best, Axel Axel POTIER vous invite à une réunion Zoom programmée. Sujet: WP2.3 zoom meeting Heure: 24 avr. 2026 10:00 AM Paris Participer à la réunion Zoom https://u-paris.zoom.us/j/81928907331?pwd=MebhBUKg6y9z6jHQramlzCb3aJ14qD.1 ID de réunion: 819 2890 7331 Code secret: 860862 --- Une seule pression sur l’appareil mobile +33186995831,,81928907331#,,,,*860862# France +33170372246,,81928907331#,,,,*860862# France --- Participez à l’aide d’un protocole SIP • 81928907331(a)zoomcrc.com Code secret: 860862 Instructions pour participer https://u-paris.zoom.us/meetings/81928907331/invitations?signature=AZkMRhXH… > Le 2 avr. 2026 à 18:10, Axel Potier <axel.potier(a)obspm.fr> a écrit : > > Dear PCS WP2 member, > > I propose you to postpone our next meeting WP2.3 (wavefront sensing and control) that was originally planned tomorrow. > Here is the new time slot: April 24th from 10am to 11am. I will ask some of you to present their current projects, followed by a discussion on the next steps. > > Meanwhile, you can find attached the literature review we have discussed the past few months. This is still a draft and I know I still miss a few information some of you already provided. So please reach out to me for any update or correction on the current draft :-) . > > Have a great end of the week, > Best, > Axel > > <PCS_WP23_WFSConcepts_Draft.pdf>

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