Jorge Pullin

Physicist, motorcyclist, bagpiper, marathon runner, blogger, open access editor.

Horace Hearne Chair in Theoretical Physics at the Louisiana State University.

[Jorge Pullin @jorgepullin]

https://t.co/PXT4eUlyOt
The Physics Community that Met Online Before Online Meetings Existed

[Jorge Pullin @jorgepullin]

Another B&K hammer test. This time the suspensions were too small to install accelerometers, so we used the laser vibrometer (yellow). The green arrows show some of the vibration dampers I built a few weeks ago, they have installed them. @LIGOLA

[Jorge Pullin @jorgepullin]

@LSU Plus one of the faculty members owns one of the coolest Hyundais around!

[Jorge Pullin @jorgepullin]

@DrHelenFry She is the granddaughter of famous physicist Max Born.

[Jorge Pullin @jorgepullin]

https://t.co/qeKO1udcsA @LIGOLA
LSU Chancellor visits LIGO.

[Pasiones Ocultas @LatidosDePasion]

🧵 4 cosas que quizás no sabías de la Tortilla de Patatas española 🥔🇪🇸
Más que un plato, es un icono cultural, un campo de batalla gastronómico y una embajadora mundial. ¡Empezamos! 👇

[Jorge Pullin @jorgepullin]

Argentina Iceland

[Jorge Pullin @jorgepullin]

The suspension we spent last semester building (green outline) is now installed in HAM6. The optics team has added a bunch of stuff on it and around it. @LIGOLA

[Jorge Pullin @jorgepullin]

Piper Bill Millin's participatin in D Day, represented in this movie,
https://t.co/Qpx54vpukm

[Jorge Pullin @jorgepullin]

The installation of the suspension we built last semester is now complete. This requires rebalancing the active seismic isolation system it is built on (ISI), so it "floats" within its allowed range. This is done by adding and removing masses, indicated by green arrows in the picture. @LIGOLA

[Jorge Pullin @jorgepullin]

Topgunning a suspension. We spray suspensions and optics with ionized nitrogen. This blows off dust, but more importantly, it discharges potential buildups of static electricity, which attracts dust and creates other problems. @LIGOLA

[Jorge Pullin @jorgepullin]

@elonmusk Why can't Grok generate a PDF?

[Jorge Pullin @jorgepullin]

The B&K hammer test. A sensor is placed on a structure and it is hit with a hammer also containing a sensor. Software then analyzes the resonances, modes and damping of the structure. @LIGOLA

[Jorge Pullin @jorgepullin]

Installing back the door in the chamber that hosts the interior text mass Y (ITMY), called BSC1. @LIGOLA

[Jorge Pullin @jorgepullin]

Today we installed the scaffolding known as "the oil rig" (for its similarity with one) on the intermediate text mass x (ITMX). @LIGOLA

[Jorge Pullin @jorgepullin]

LIGO jargon: "running a B&K test on a BRD". Brüel & Kjær sell the laser vibrometer (yellow) that it is being used to study the resonances of a Blade Resonance Damper that goes on the Bigger Beam Splitter Suspension (illuminated by the laser on the optical table). @LIGOLA

[Jorge Pullin @jorgepullin]

Lots of rain in Baton Rouge. Our flooded backyard is a favorite feeding place for egrets apparently.

[Jorge Pullin @jorgepullin]

Building more vibration dampers for the suspensions. @LIGOLA

[Jorge Pullin @jorgepullin]

Installing the baffles in one of the inner test masses. They look shiny to us, but for the light of the interferometer they are quite absorbent. They catch stray light and prevent it from reflecting on the walls and other parts of the interferometer that are not isolated seismically. @LIGOLA

[Jorge Pullin @jorgepullin]

The Bigger Beam Splitter is fully assembled, cabled and in position and its active isolation system is balanced an ready for testing. @LIGOLA

[Jorge Pullin @jorgepullin]

Raising the clean room that sits on the Beam Splitter Chamber (BSC2), now that it is installed. It had been lowered for installation. Each leg has an actuator (that yellow thing behind the curtain) and is controlled by the box visible in front. @LIGOLA