View allAll Photos Tagged ExperimentalPhysics
The droplet rises like a pillar of fire, caught in a surreal moment where liquid defies gravity. The interplay of red hues makes it feel like a flame frozen in time, a reminder that even chaos can be beautifully structured.
Experimentelle Physik
Experimental Physics
Science-Fiction
Dematerialisierung als erster Schritt zur Teleportation...
Dematerialization as a first step towards teleportation...
Standing face-to-face with the detector felt surreal. It’s this incredible portal capturing traces of particles from collisions that mimic the birth of the universe. At 100 metres below Geneva, surrounded by wires and glowing lights, I couldn’t help but feel like I’d stepped into the heart of a science fiction story come to life.
The Large Hadron Collider was open to public these weekend for a small amount of people, and I will show you some more pictures soon!
The LHC is built in a tunnel with a circumference of 27 km in Geneva. 2015 the "famous" Higgs Boson was proven.
This is one of the 4 mega detectors at the LHC, CERN in Geneva. This is where I work :)
Here is more : cms.web.cern.ch/
This is one of the 4 mega detectors at the LHC, CERN in Geneva. This is where I work :)
Here is more : cms.web.cern.ch/
This is one of the 4 mega detectors at the LHC, CERN in Geneva. This is where I work :)
Here is more : cms.web.cern.ch/
Before running experiments at the Large Hadron Collider, physicists use a tool called a Feynman diagram to generate a prediction for what they should see when they smash particles together. This theoretical prediction serves as a guide that allows them to interpret experimental data...The Long Road
1.In quantum mechanics, particle collisions are represented by Feynman diagrams. These diagrams include the initial state (particles going in), the end state (particles going out) and all the intermediate collisions that take place in between.
2.Physicists would like to consider as many possible routes as they can. Here are four interactions from a sample collision. But there can be thousands.
3.For each diagram, physicists can calculate a “Feynman integral” that takes into account the mass, momentum and direction of motion of the colliding particles.
4.To determine the probability that colliding particles will create the given end product, physicists add up the Feynman integrals for each diagram and square the magnitude of the sum.
A Potential Shortcut
Over the last decade physicists and mathematicians have discovered that amplitudes calculated from Feynman diagrams are always a certain class of number, called a period.
Periods are important numbers in mathematics because they describe characteristics of fundamental objects known as “motives,” which are related to polynomial equations. Periods of motives include values of the Riemann zeta function (ζ).
Mathematicians study the structure and properties of all periods. If physicists could find the same kind of mathematical structure in the amplitudes arising from Feynman diagrams, they could calculate experimental probabilities much more easily
I hand-wound this solenoid. It was very frustrating. Man years later, Hanhee tells me that she winds solenoids using a drill... @#$!
Project description:
Thermometers for Studies at the Tricritical Point in Liquid Helium Mixtures
The EXACT flight definition experiment requires a high resolution thermometer (HRT) to study liquid helium mixtures at the tricritical point. The HRT must have a resolution less than or equal to 8 nK in the temperature range of 0.7-1.0 K. In this work, the sensitivity of an HRT was measured to determine its resolution. The thermometer uses a DC SQUID (Superconducting Quantum Interference Device) magnetometer to detect changes in the magnetic susceptibility of a paramagnetic material as a function of temperature. A magnetic field applied by a solenoid amplifies the magnetization of the material to yield a higher sensitivity, and a computer data acquisition program records the SQUID signal at equally spaced temperatures between 0.7 and 1.0 K. Preliminary measurements show that an HRT using gadolinium gallium garnet (GGG) in an applied magnetic field of 3-4 G can achieve a sensitivity an order of magnitude better than EXACT’s requirements.
Jet Propulsion Lab, Pasadena, CA 1999
Project description
Electron Spin Resonance Scanning Tunneling Microscopy
Electron spin resonance based scanning tunneling microscopy (ESR-STM) has been proposed as a method to detect spins of single molecules. The ability to measure single spins would open up new possibilities in analytical chemistry and quantum computing. Here, I report on my effort to repeat the ESR-STM experiments of Durkan and Welland. In particular, I took STM images, characterized drift, and built a vibration isolation system.
MIT Quanta Lab, Cambridge, MA 2002
Lots of optical equipment - lenses, translation stages, optical table, etc.
Project description:
Alignment Considerations In A VCSEL-Based Board-to-Board Optical Interconnect
(VCSEL = vertical cavity surface emitting laser)
The need for greater computing power leads to increasing difficulty in routing electrical signals, which makes board-to-board optical interconnects an attractive alternative. A critical hurdle to the development of this technology is overcoming misalignment, which can cause unwanted crosstalk in a multiple channel link. An experiment was done to measure the optical power received with x-axis misalignment of a DC-biased transmitter and receiver. Theoretical predictions agree favorably with the results around the peak of the power distribution. With a few assumptions, calculations can be done to estimate misalignment tolerance of a real system and optimize parameters such as detector geometry and transmitter-receiver distance.
Sun Microsystems Lab, Mountain View, CA 2000
My friend the FFT. I think this is data from the vibration sensor.
MIT Quanta Lab, Cambridge, MA 2002
The frame is made of 80-20 and lined with foam. The bottom is a couple slabs of granite for weight.
I later abandoned this project and another professor inherited this box. Apparently, he though my box worked really well and would smile when he saw me in the hallway (despite the fact that it took me forever to build it).
MIT Quanta Lab, Cambridge, MA 2002
Project description
Search for the Kondo Lattice
Using the atom manipulation capabilities of the scanning tunneling microscope (STM), we investigate the interactions that result from a square lattice of Kondo impurities. Spectroscopy measurements agree qualitatively with single impurity scattering theory. The agreement suggests that the impurities in the lattice do not interact strongly with one another (as in a Kondo lattice).
IBM Almaden Research Lab, San Jose, CA 2001
You can see a square lattice with the center impurity missing. The "mountains" are due to what we call an STM head crash.
IBM Almaden Research Lab, San Jose, CA 2001
The postdoc took this photo and made me wear full safety equipment.
Jet Propulsion Lab, Pasadena, CA 1999
I was all ready to do my measurements on many different sized square lattices, and then my boss decided to show some visitors the STM room. Somehow the STM head crashed and destroyed a lot of my work.
IBM Almaden Research Lab, San Jose, CA 2001
Analogfoto: 30 Sec. belichtet, leider war der Raum nicht sorgfälltig genug abgedunkelt,
so das Fremdlicht sich störend ausgewirkt hat.
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