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[instrumentation meeting] Oort room (BM4.33) @11:00
by Michiel Darcis 22 Oct '25

22 Oct '25

Hi all, This week we have our own Emily van Hese who will give us the privilege of seeing her presentation that she will give during the ICSOS conference in Kyoto. The abstract reads as follows: 'Enabling optical satellite-to-ground (quantum) communication links necessitates reducing the free-space to fibre coupling losses induced by atmospheric turbulence. Adaptive optics (AO) and multi-mode fibres (MMF) are two of the most prominent methods to achieve a limited fibre coupling loss. AO is a mature technology and is already used to great effect. Meanwhile multi-mode fibres promise similar performance, while boasting entirely passive systems. However, the necessary high-order systems of either technology may lead to high complexity solutions and high costs. A hybrid solution featuring low-order systems of both technologies might offer the required performance while circumventing the need for high-order systems. This paper studies the optimal combination of AO and MMF by identifying trade-offs between them and investigating the relative merits of potential individual and combined systems for an LEO satellite optical downlink using numerical simulations. For each simulated MMF size, the minimum required level of adaptive optics correction for a median coupling losses of 2 dB is evaluated.' After her presentation we will continue with our usual slides game. Therefore send your slides to m.darcis(a)sron.nl<mailto:m.darcis@sron.nl> and haffert(a)strw.leidenuniv.nl<mailto:haffert@strw.leidenuniv.nl>. See you there, Michiel Michiel Darcis is inviting you to a scheduled Zoom meeting. Topic: Instrumentation meeting Join Zoom Meeting https://universiteitleiden.zoom.us/j/61014126606?pwd=XwqwfIBv4aIIsbHi08SLPz… Meeting ID: 610 1412 6606 Passcode: s3!UMxi! --- One tap mobile +496971049922,,61014126606#,,,,*85101216# Germany Join instructions https://universiteitleiden.zoom.us/meetings/61014126606/invitations?signatu…

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Group meeting today at 11:00 in the Oort room
by Matthijs 15 Oct '25

15 Oct '25

Hi all, A few of us are at a workshop at ESTEC. For the rest of us, we meet in the Oort room at 11 as usual. Please send your slides to me and Sebastiaan. Best, Matthijs p.s. for those joining online: Matthijs Mars is inviting you to a scheduled Zoom meeting. Topic: Matthijs Mars's Personal Meeting Room Join Zoom Meeting https://universiteitleiden.zoom.us/j/8067521313?pwd=ScyKUOBlWcI0Srija7Zlo8p… Meeting ID: 806 752 1313 Passcode: sLaJ*r3B --- One tap mobile +496971049922,,8067521313#,,,,*05042614# Germany Join instructions https://universiteitleiden.zoom.us/meetings/8067521313/invitations?signatur…

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Group meeting today at 11:00 in the Oort room
by Matthijs 15 Oct '25

15 Oct '25

Hi all, A few of us are at a workshop at ESTEC. For the rest of us, we meet in the Oort room at 11 as usual. Please send your slides to me and Sebastiaan. Best, Matthijs p.s. for those joining online: Matthijs Mars is inviting you to a scheduled Zoom meeting. Topic: Matthijs Mars's Personal Meeting Room Join Zoom Meeting https://universiteitleiden.zoom.us/j/8067521313?pwd=ScyKUOBlWcI0Srija7Zlo8p… Meeting ID: 806 752 1313 Passcode: sLaJ*r3B --- One tap mobile +496971049922,,8067521313#,,,,*05042614# Germany Join instructions https://universiteitleiden.zoom.us/meetings/8067521313/invitations?signatur…

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Tikkie for karaoke
by Elena Tonucci 09 Oct '25

09 Oct '25

Hello everyone! I am happy that we had a great time at the karaoke last Tuesday. Here you have a Tikkie where you can pay me back for the karaoke reservation. It's 17 euros per person. If Tikkie doesn't work for you, let me know and we can find a different way. Thank you! https://tikkie.me/pay/6nnhtip5jpgjh0bq3vbr Cheers, Elena -- Best regards, *Elena Tonucci* PhD Candidate Astronomy on Tap Committee, Paper Flash, PhD Ambassador, Social Committee *Leiden University* | Faculty of Science - Leiden Observatory | Einsteinweg 55, office BW3.46 | 2333 CC Leiden | (+39) 327 7664740

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Group meeting today at 11:00 in the Oort room
by haffert＠strw.leidenuniv.nl 08 Oct '25

08 Oct '25

Hi all, It’s the day of the group meeting again. We will meet at 11:00 in the Oort room. Today I will give a short presentation (10 – 15 minutes) on the PCS instrument and how we contribute to the project. Afte that we will do our usual slide roulette. Rules: Submit 2 slides with at least 1 picture per slide. Send the slides to me at haffert(a)strw.leidenuniv.nl <mailto:haffert@strw.leidenuniv.nl> or on Slack. People that are new to the group should make a slide or 2 to introduce yourself. 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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Social activity tonight reminder
by Elena Tonucci 07 Oct '25

07 Oct '25

Hello everyone, Just a reminder of our social activity tonight! We will have dinner at Pavarotti starting at 18:00. Then, we have a karaoke boot in the same place at 20:00 for one hour. The karaoke boot can host up to 20 people so if anyone wants to join last minute, feel free to just show up tonight. See you tonight! Cheers, Elena -- Best regards, *Elena Tonucci* PhD Candidate Astronomy on Tap Committee, Paper Flash, PhD Ambassador, Social Committee *Leiden University* | Faculty of Science - Leiden Observatory | Einsteinweg 55, office BW3.46 | 2333 CC Leiden | (+39) 327 7664740

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Social next week
by Elena Tonucci 02 Oct '25

02 Oct '25

Dear all, I am organising the social activity of the instrumentation group this month! We are planning to go to Pavarotti to eat pizza (yeeyy...) and get a boot for karaoke. This will be on Tuesday 7th October from 18 onwards. Let me know if you would like to join by tomorrow night, so I can book throughout the weekend and be sure we can get a spot! +1s are welcome, just let me know. Looking forward to singing with you. Cheers, Elena -- Best regards, *Elena Tonucci* PhD Candidate Astronomy on Tap Committee, Paper Flash, PhD Ambassador, Social Committee *Leiden University* | Faculty of Science - Leiden Observatory | Einsteinweg 55, office BW3.46 | 2333 CC Leiden | (+39) 327 7664740

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Group meeting today at 11:00 in the Oort room
by haffert＠strw.leidenuniv.nl 01 Oct '25

01 Oct '25

Hi all, Today is a beautiful day for another instrumentation group meeting! The group meeting will be in the Oort room as usual. Here is the room zoom link: https://universiteitleiden.zoom.us/j/7267353069?pwd=JQ4pnKb14HkPby0v9XJqmcg… Meeting ID: 726 735 3069 Passcode: s$Rw5KhA And don’t forget: if you don’t have a PhD you need to send 2 slides with at least 1 figure on each slide to me. See you all-in an hour, Sebastiaan

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Instrumentation meeting today at 11:00 in the Oort room
by Rico Landman 24 Sep '25

24 Sep '25

Hi all, Even though some of us are away for a workshop, we will have another instrumentation meeting at 11:00 in the Oort room. Please send your slides to me and haffert(a)strw.leidenuniv.nl <mailto:haffert@strw.leidenuniv.nl>. See you all there! Best, Rico

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homemade muffins
by Bernhard R. Brandl 22 Sep '25

22 Sep '25

Dear Instrumentalists, I have some homemade blueberry/cranberry muffins (leftovers from our "buurtfeest" yesterday) in my office BW.3.43. First come, first serve! Cheers, Bernhard -- ********************************************* Dr. Bernhard R. Brandl Professor of Infrared Astronomy Sterrewacht Leiden, Leiden University Office: BW.3.43, Einsteinweg 55, 2333 CC Leiden, NL Mail: P.O. Box 9513, 2300 RA Leiden, NL Phone: +31 (0)71 527 5830 Mobile: +31 (0)6 211 85430 email: brandl(a)strw.leidenuniv.nl web: http://www.strw.leidenuniv.nl/~brandl ------------------ AND ----------------------- Dr. Bernhard R. Brandl Professor of Astronomy & Instrumentation Delft University of Technology Faculty of Aerospace Engineering Kluyverweg 1, 2629 HS Delft, The Netherlands email: b.r.brandl(a)tudelft.nl *********************************************

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