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A Wilson cloud chamber is basically a tank of condensed, supercooled water (or alcohol) vapour. It is used to detect high energy particles - ionizing radiation. The radiation, say from cosmic rays, or radioactivity, or particle accelerators and so forth, leave their distinctive trails in the "clouds". Because of conservation laws (conservation of angular momentum, and conservation of charge, in particular) you get these wonderful spiralling trails. If you look carefully, there's a whole lot of symmetries in the image. In fact, if you look really carefully and measure angles, it's possible to get the mass to charge ratio of the particle in question. It's really a magic piece of 20th century science instrumentation.
This is a two colour screenprint I made of clouds and ionization tracks in a cloud chamber.
Fermilab Antiproton Source
The antiproton is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has opposite electric charge and magnetic moment than the proton. The question of how matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little antimatter exists today.
en.wikipedia.org/wiki/Antiproton
Fermilab Antiproton Source Department
Picture taken by Michael Kappel at Fermilab
View the high resolution image on my photo website
Fermilab Antiproton Source
The antiproton is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has opposite electric charge and magnetic moment than the proton. The question of how matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little antimatter exists today.
en.wikipedia.org/wiki/Antiproton
Fermilab Antiproton Source Department
Picture taken by Michael Kappel at Fermilab
View the high resolution image on my photo website
Center section of the CMS (Compact Muon Solenoid) detector at CERN's Large Hadron Collider. This is in the assembly hall above ground; each one of these will eventually be lowered 300 feet underground and reassembled in place.
Collider tunnel at CERN's Large Hadron Collider. This goes around in circle for about 17 miles.... the beam pipe on the right is surrounded by superconducting liquid-helium-cooled magnets. Protons in the pipe will reach 99.999% of the speed of light. Or so I'm told.
The "toaster" in the middle and the tower to the right are part of the former generator of the Cockcroft Walton type. This was decommissioned in ~2012, but it served the lab for many years.
Here's a Fermilab photo of the generator when it was still assembled, taken by lab photographer, Reidar Hahn.
This 2012 Fermilab newsletter has an article on the decommissioning of the generator.
Fermilab Antiproton Source
The antiproton is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has opposite electric charge and magnetic moment than the proton. The question of how matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little antimatter exists today.
en.wikipedia.org/wiki/Antiproton
Fermilab Antiproton Source Department
Picture taken by Michael Kappel at Fermilab
View the high resolution image on my photo website
Fermilab Antiproton Source
The antiproton is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has opposite electric charge and magnetic moment than the proton. The question of how matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little antimatter exists today.
en.wikipedia.org/wiki/Antiproton
Fermilab Antiproton Source Department
Picture taken by Michael Kappel at Fermilab
View the high resolution image on my photo website
Fermilab Antiproton Source
The antiproton is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has opposite electric charge and magnetic moment than the proton. The question of how matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little antimatter exists today.
en.wikipedia.org/wiki/Antiproton
Fermilab Antiproton Source Department
Picture taken by Michael Kappel at Fermilab
View the high resolution image on my photo website
CMS in its cavern. The 5 red slices are the barrel wheels called "YB" followed by a number. More pictures and explanations here
Fermilab Antiproton Source
The antiproton is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has opposite electric charge and magnetic moment than the proton. The question of how matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little antimatter exists today.
en.wikipedia.org/wiki/Antiproton
Fermilab Antiproton Source Department
Picture taken by Michael Kappel at Fermilab
View the high resolution image on my photo website
Fermilab Antiproton Source
The antiproton is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has opposite electric charge and magnetic moment than the proton. The question of how matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little antimatter exists today.
en.wikipedia.org/wiki/Antiproton
Fermilab Antiproton Source Department
Picture taken by Michael Kappel at Fermilab
View the high resolution image on my photo website
Fermilab Antiproton Source
The antiproton is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has opposite electric charge and magnetic moment than the proton. The question of how matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little antimatter exists today.
en.wikipedia.org/wiki/Antiproton
Fermilab Antiproton Source Department
Picture taken by Michael Kappel at Fermilab
View the high resolution image on my photo website
Fermilab Antiproton Source
The antiproton is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has opposite electric charge and magnetic moment than the proton. The question of how matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little antimatter exists today.
en.wikipedia.org/wiki/Antiproton
Fermilab Antiproton Source Department
Picture taken by Michael Kappel at Fermilab
View the high resolution image on my photo website
Cyclotron Magnet at Lawrence Hall of Science in Berkeley, California - © 2015 David Oppenheimer - Performance Impressions Photography Archives - www.performanceimpressions.com
Fermilab Antiproton Source
The antiproton is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has opposite electric charge and magnetic moment than the proton. The question of how matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little antimatter exists today.
en.wikipedia.org/wiki/Antiproton
Fermilab Antiproton Source Department
Picture taken by Michael Kappel at Fermilab
View the high resolution image on my photo website
Fermilab Antiproton Source
The antiproton is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has opposite electric charge and magnetic moment than the proton. The question of how matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little antimatter exists today.
en.wikipedia.org/wiki/Antiproton
Fermilab Antiproton Source Department
Picture taken by Michael Kappel at Fermilab
View the high resolution image on my photo website
The exterior of the Universe of Particles exhibit at CERN.
CERN (the European Organisation for Nuclear Research) is a scientific research laboratory located on the outskirts of Geneva in the suburb of Meyrin.
Established in 1954 it is a laboratory for particle physics research and is home to the Large Hadron Collider – a 27km circular tube in which scientists attempt to create new forms of matter and recreate the Bog Bang on a small scale.
A visitor centre housed in a large globe on the site offers light shows and numerous electronic and more tradition displays to explain the foundation’s work and the theories and laws of particle physics.
Fermilab Antiproton Source
The antiproton is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has opposite electric charge and magnetic moment than the proton. The question of how matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little antimatter exists today.
en.wikipedia.org/wiki/Antiproton
Fermilab Antiproton Source Department
Picture taken by Michael Kappel at Fermilab
View the high resolution image on my photo website
To make new discoveries in an accelerator, scientists can increase the energy and/or the luminosity (related to collision rate). Increased energy is pretty clear: the harder protons hit protons in the LHC, the more likely interesting things will come out. Luminosity is different. The greater the rate of collisions (luminosity), the more chances we have to create something new - and the more complicated the analysis. This CMS event has four different collisions at pretty much the same time. Count them!
Copyright CERN for the benefit of the CMS Collaboration
This view is looking at the side of the ATLAS experiment. To orient yourself, think of the experiment as a 7,000-tonne roll of toilet paper. We are looking at the rounded side of the roll. Conveniently, this particular roll of toilet paper can be pulled apart in sections, and we can see some of the inner layers of the roll. The particle beam is like the spring-loaded plastic toilet paper holder, passing through the center of the experiment.
Now that everyone knows my true level of understanding of the most complex physics experiment in existence, let's see if I can confuse you further. For those of you unfamiliar with the particle accelerator, the general idea is that protons are winging around a 27km-diameter ring located 100m underground near Geneva. The protons are moving at close to the speed of light, pushed around the ring as well as held inside the ring by powerful magnets. The goal of this particle accelerator is to cause bunches of protons to collide, preferably in the center of an experiment like ATLAS. The collision at such high energies produces all sorts of interesting sub-atomic particles as the protons break down into their component bits. As all these wee bits explode outward through the various detection layers of the experiment, the physicfolk can decipher what's going on and thereby test their hypotheses.
Back to the image: The ridged silver piece in the left of the image is one of the endcap toroidal magnets surrounding the particle beam. There are a lot of magnets on this puppy. I would not recommend visiting if you have a pacemaker. The magnets exert force on the charged particles created by the proton collisions; they cause the particles to rotate around the particle beam (almost like the sheets of tp around the cardboard center of a tp roll!). These forces are one tool that allow smahht people to measure particle momentum, based on how much those particles' paths are bent by the magnets (more momentum => straighter path). This entire magnet is normally located farther to the left, inside the center of the experiment. The gold-colored plates are one end-cap of the experiment, and are also moved to the left with the magnet when the experiment is running.
I believe the gold-colored plates are muon detectors; they have those things strapped all over the place. Apparently there are LOTS of muons running around.
There are also bigger magnets (!) as well as other types of detectors on the experiment: calorimeters (measure energy of particles), scintillators (scintillating!), and pixel detectors (measure location precisely, located close to the collision point in the experiment) including a fancy new pixel detector (more photos later).
Geneva, Switzerland
March 2014
Fermilab Antiproton Source
The antiproton is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has opposite electric charge and magnetic moment than the proton. The question of how matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little antimatter exists today.
en.wikipedia.org/wiki/Antiproton
Fermilab Antiproton Source Department
Picture taken by Michael Kappel at Fermilab
View the high resolution image on my photo website
Fermilab Antiproton Source
The antiproton is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has opposite electric charge and magnetic moment than the proton. The question of how matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little antimatter exists today.
en.wikipedia.org/wiki/Antiproton
Fermilab Antiproton Source Department
Picture taken by Michael Kappel at Fermilab
View the high resolution image on my photo website
TRIUMF Laboratory, Canada
Credit: Gerard Laman
A beam line at TRIUMF designed for precision transport of subatomic particles such as the nuclei of exotic isotopes.
Fermilab Antiproton Source
The antiproton is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has opposite electric charge and magnetic moment than the proton. The question of how matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little antimatter exists today.
en.wikipedia.org/wiki/Antiproton
Fermilab Antiproton Source Department
Picture taken by Michael Kappel at Fermilab
View the high resolution image on my photo website
Fermilab Antiproton Source
The antiproton is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has opposite electric charge and magnetic moment than the proton. The question of how matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little antimatter exists today.
en.wikipedia.org/wiki/Antiproton
Fermilab Antiproton Source Department
Picture taken by Michael Kappel at Fermilab
View the high resolution image on my photo website