Christian Grefe
@cgrefe.bsky.social
Particle physicist at University of Bonn, working on the ATLAS experiment at CERN. https://orcid.org/0000-0001-7050-5301
Particle physicists are somewhere in between astrophysicists and travel bloggers 😂
February 9, 2026 at 7:08 AM
Particle physicists are somewhere in between astrophysicists and travel bloggers 😂
Four months after inheriting this office orchid it decided to flower again.
February 6, 2026 at 9:13 AM
Four months after inheriting this office orchid it decided to flower again.
Ausnahmsweise keine Berge die den Horizont versperren
December 26, 2025 at 5:11 PM
Ausnahmsweise keine Berge die den Horizont versperren
Outreach, diversity and career aspects are now also mentioned explicitly in the recommendations.
December 12, 2025 at 2:15 PM
Outreach, diversity and career aspects are now also mentioned explicitly in the recommendations.
Sustainability is now more prominently mentioned with a dedicated section (was grouped with impact on society in the last iteration from 2020)
December 12, 2025 at 2:15 PM
Sustainability is now more prominently mentioned with a dedicated section (was grouped with impact on society in the last iteration from 2020)
The major new decision is the decision for the FCCee as the next major flagship collider to be realised at CERN in the 2040s after the conclusion of the HL-LHC programme.
December 12, 2025 at 2:06 PM
The major new decision is the decision for the FCCee as the next major flagship collider to be realised at CERN in the 2040s after the conclusion of the HL-LHC programme.
As already in previous updates, the realisation and success of the High Luminosity upgrade of the LHC has highest priority. The project is fully funded and the upgrades will be installed between 2026 and 2030.
December 12, 2025 at 2:04 PM
As already in previous updates, the realisation and success of the High Luminosity upgrade of the LHC has highest priority. The project is fully funded and the upgrades will be installed between 2026 and 2030.
Just checked and all is still good here as well. I also started thinking about data science applications for our membership database...
December 8, 2025 at 3:27 PM
Just checked and all is still good here as well. I also started thinking about data science applications for our membership database...
Speaking of low standards. Die Empfehlung des Schweizer Bundesamtes für Gesundheit ist mindestens 2 alkoholfreie Tage pro Woche??? 🤯
December 3, 2025 at 7:45 AM
Speaking of low standards. Die Empfehlung des Schweizer Bundesamtes für Gesundheit ist mindestens 2 alkoholfreie Tage pro Woche??? 🤯
Last part of the 2025 LHC physics programme has just started. We will take 3 weeks of heavy ion collision data before going to a short end of year break in December.
November 14, 2025 at 2:59 PM
Last part of the 2025 LHC physics programme has just started. We will take 3 weeks of heavy ion collision data before going to a short end of year break in December.
Was fun to see so many friends and colleagues on the big screen 😃 Not sure when and where "the peace particle" movie will be screened for a wider audience, but I can definitely recommend it.
November 13, 2025 at 10:00 PM
Was fun to see so many friends and colleagues on the big screen 😃 Not sure when and where "the peace particle" movie will be screened for a wider audience, but I can definitely recommend it.
Amateurs 😄 The @atlasexperiment.bsky.social has to detect particle collisions every 25ns (40MHz). Then our first level trigger system has about 2.5 microseconds to analyse and decide whether to keep each of these events and pass it to the second level trigger before the buffers overflow.
November 7, 2025 at 7:40 AM
Amateurs 😄 The @atlasexperiment.bsky.social has to detect particle collisions every 25ns (40MHz). Then our first level trigger system has about 2.5 microseconds to analyse and decide whether to keep each of these events and pass it to the second level trigger before the buffers overflow.
Why on earth needs a scientific publisher like Elsevier a "Director of Generative AI"? Why do we need AI-supported peer review? I want to read about original research not some plausible-sounding made up garbage.
October 28, 2025 at 2:54 PM
Why on earth needs a scientific publisher like Elsevier a "Director of Generative AI"? Why do we need AI-supported peer review? I want to read about original research not some plausible-sounding made up garbage.
In der Hinsicht war ich letztes Jahr tatsächlich positiv überrascht von Stark Watzinger. Keine merkwürdigen Anmerkungen über eigenes (Un)wissen in Naturwissenschaften sondern tatsächlich relativ sinnvolle und interessierte Nachfragen.
October 23, 2025 at 6:59 PM
In der Hinsicht war ich letztes Jahr tatsächlich positiv überrascht von Stark Watzinger. Keine merkwürdigen Anmerkungen über eigenes (Un)wissen in Naturwissenschaften sondern tatsächlich relativ sinnvolle und interessierte Nachfragen.
Da ist man zwei Wochen nicht in Genf in dann so etwas...
October 5, 2025 at 6:34 PM
Da ist man zwei Wochen nicht in Genf in dann so etwas...
Ähnlich übrigens in der Schweiz, das eigentlich nur zwei Hauptachsen hat, und darüber hinaus viel kürzere Strecken hat.
October 1, 2025 at 7:44 AM
Ähnlich übrigens in der Schweiz, das eigentlich nur zwei Hauptachsen hat, und darüber hinaus viel kürzere Strecken hat.
Natürlich macht Japan einen besseren Job bei der Bahninfrastruktur, trotzdem kann man die Komplexität der beiden Schienennetze einfach nicht vergleichen. Die größten Verspätungen hat man in Deutschland wenn man einen Anschluss verpasst. Japan hat nur eine lange Linie mit ein paar Abzweigungen.
October 1, 2025 at 7:36 AM
Natürlich macht Japan einen besseren Job bei der Bahninfrastruktur, trotzdem kann man die Komplexität der beiden Schienennetze einfach nicht vergleichen. Die größten Verspätungen hat man in Deutschland wenn man einen Anschluss verpasst. Japan hat nur eine lange Linie mit ein paar Abzweigungen.
If you see this, post a bridge.
(Pont du Mont Blanc, Geneva)
(Pont du Mont Blanc, Geneva)
September 26, 2025 at 7:11 PM
If you see this, post a bridge.
(Pont du Mont Blanc, Geneva)
(Pont du Mont Blanc, Geneva)
Und wie war euer Sonnenuntergang so?
September 25, 2025 at 7:13 PM
Und wie war euer Sonnenuntergang so?
Got a new temporary office mate. ⚛️
September 16, 2025 at 10:28 AM
Got a new temporary office mate. ⚛️
Falls sich jemand fragt was demnächst in den USA passiert: Reichsgesetzblatt I, 1933.
September 11, 2025 at 5:46 AM
Falls sich jemand fragt was demnächst in den USA passiert: Reichsgesetzblatt I, 1933.
A few months ago our institute moved into a brand new building, but they messed up the institute name on ALL direction signs within the building. I take your guesses on how long we will have to live with this "intermediate" solution.
September 10, 2025 at 11:41 AM
A few months ago our institute moved into a brand new building, but they messed up the institute name on ALL direction signs within the building. I take your guesses on how long we will have to live with this "intermediate" solution.
Freitag Nachmittag in NRW, die Zugbindung ist aufgehoben.
August 29, 2025 at 1:11 PM
Freitag Nachmittag in NRW, die Zugbindung ist aufgehoben.
Alle Züge pünktlich, E-Mails abgearbeitet, jetzt Kaffeepause und dann weiter Lehre vorbereiten.
August 27, 2025 at 9:09 AM
Alle Züge pünktlich, E-Mails abgearbeitet, jetzt Kaffeepause und dann weiter Lehre vorbereiten.