Relativistic Heavy Ion Collider

Big machines crash tiny things.

These tiny things move very fast. They hit each other hard. This makes things very hot. It helps us learn about the start of everything.

This machine is in New York. It uses two big rings. Tiny bits of gold fly in the rings. They go in opposite ways. Then they hit each other.

These hits make a very hot liquid. It is hotter than anything else. It is like the very start of our world. Scientists use big tools to see it.

One tool is called STAR. Another new tool is sPHENIX. They watch the tiny bits hit. This helps us learn more.

It is amazing to see such small things. We can learn so much from them.

The Relativistic Heavy Ion Collider, or RHIC, is a big machine in New York.

It is used to study the very start of our universe. RHIC works by crashing tiny parts of atoms together. These tiny parts are called ions. They travel at speeds very close to the speed of light.

RHIC uses two big rings. These rings are shaped like a hexagon. One ring is called Blue and the other is Yellow. Particles fly in these rings in opposite ways. When they meet, they crash into each other. Scientists use big tools called detectors to watch these crashes. One large detector is named STAR. Another new tool is named sPHENIX.

These crashes make things very hot. Scientists measured temperatures as high as 7 trillion degrees Fahrenheit! This is the highest temperature ever made in a lab. The heat makes normal matter break down. It creates a liquid-like state called quark-gluon plasma. This liquid is a way to see how matter looked right after the Big Bang. RHIC will stop running in 2026. A new project called the Electron-Ion Collider will take its place.

The Relativistic Heavy Ion Collider, or RHIC, is a special machine in Upton, New York.

It is located at the Brookhaven National Laboratory. This machine is the only particle collider currently working in the United States. Scientists use it to study the very first moments of our universe. By crashing tiny particles together, they can see how matter behaved right after the Big Bang. This helps us understand the building blocks of everything we see today.

RHIC works by using two large, hexagon-shaped rings. One ring is called Blue and the other is called Yellow. These rings hold particles that travel in opposite directions. To get started, particles go through several booster stages. Gold ions start in an electron beam ion source. Protons start in a linear accelerator. These particles are sped up until they move at 99.995% of the speed of light. Finally, they crash at six specific interaction points where the rings cross.

Researchers have used this machine to discover amazing things about heat. In 2010, scientists published results from gold ion collisions. They found temperatures reaching 7 trillion degrees Fahrenheit. This is the highest temperature ever made in a laboratory. At this heat, normal matter breaks down into a liquid-like state. This state is called a quark-gluon plasma. It allows us to study the primordial form of matter from the start of time.

RHIC is a very advanced tool with many specific parts. It uses 1,740 superconducting magnets to guide the particles. These magnets use niobium-titanium conductors to work. Two large experiments, STAR and sPHENIX, watch the collisions. STAR is located at the 6 o'clock position of the ring. sPHENIX is the newest experiment and sits at the 8 o'clock position. Other detectors like PHOBOS and BRAHMS were also used in the past.

This machine connects to what we know about space and atoms. It is the only collider that can crash spin-polarized protons. This helps scientists explore the internal structure of a proton. While the Large Hadron Collider in Europe reaches higher energies, RHIC can study ions for much longer. RHIC will finish its work in 2026. After it stops, a new project called the Electron-Ion Collider will begin at the same site.

The Relativistic Heavy Ion Collider, known as RHIC, is a massive scientific instrument located at Brookhaven National Laboratory in Upton, New York.

It serves as an intersecting storage ring particle accelerator. This machine is unique because it is the first and one of only two operating heavy-ion colliders in the world. It also holds the distinction of being the only spin-polarized proton collider ever built. Scientists use RHIC to study the primordial form of matter. This is the matter that existed in the universe shortly after the Big Bang. By colliding particles at relativistic speeds, researchers can recreate conditions from the very beginning of time.

To understand how RHIC works, we must look at the path a particle takes. A particle passes through several booster stages before it reaches the main storage ring. For ions, the process begins at the electron beam ion source, or EBIS. For protons, the process starts at the linear accelerator, or Linac. Gold nuclei leaving the EBIS have a specific kinetic energy per nucleon. At this stage, the gold ion has an electric charge of +32. This means 32 electrons have been stripped away from the 79 electrons in a gold atom. The particles are then accelerated by the Booster synchrotron. Next, they enter the Alternating Gradient Synchrotron, or AGS. Finally, they reach the RHIC storage ring through the AGS-to-RHIC Transfer Line. At this final stage, the gold ions have no electrons left and have a charge of +79.

The physical structure of RHIC is a hexagonally shaped double storage ring. It consists of two independent rings, which researchers call the "Blue" ring and the "Yellow" ring. These rings circulate heavy ions or polarized protons in opposite directions. To guide these particles, the facility uses 1,740 superconducting magnets. These magnets use niobium-titanium conductors to function. The dipole magnets operate at a specific strength to deflect and focus the particles. The two rings cross at six specific interaction points. These points are located in the middle of the six relatively straight sections of the hexagon. The interaction points are identified by clock positions, with the injection point near 6 o'clock.

Different experiments are stationed at these interaction points to observe the collisions. Two of the largest experiments are STAR and sPHENIX. The STAR experiment is located at the 6 o'clock position. It uses a system of time projection chambers to detect hadrons. The sPHENIX experiment is the newest addition and is located at the 8 o'clock position. It replaced the PHENIX experiment at that site. Other detectors have also contributed to the research. PHOBOS, located at 10 o'clock, had the largest pseudorapidity coverage. BRAHMS, located at 2 o'clock, was designed for momentum spectroscopy. These detectors allow scientists to see the different types of particles created during a collision.

One of the most significant discoveries made at RHIC involves extreme heat. In 2010, physicists published results regarding temperature measurements from gold ion collisions. They found that temperatures exceeded 345 MeV. This is equal to 4 terakelvin or 7 trillion degrees Fahrenheit. This is the highest temperature ever achieved in a laboratory. At these extreme temperatures, normal matter breaks down. This breakdown creates a liquid-like state called a quark–gluon plasma. This plasma allows scientists to study the fundamental properties of matter. The results showed that this matter acts like a fluid with a viscosity near the quantum limit.

RHIC is also famous for its ability to collide spin-polarized protons. A proton has an internal property called spin. RHIC holds the record for the highest energy polarized proton beams. Maintaining this spin state is a difficult task. Scientists accomplish this using "Siberian snakes." These are chains of four helical dipole magnets that create a corkscrew magnetic field. This field induces a spiral along the direction of the beam to preserve the spin. This capability allows researchers to explore the complex spin structure of the proton. This is something other colliders, like the Large Hadron Collider, do not do in the same way.

While the Large Hadron Collider (LHC) at CERN can collide heavy ions at higher energies, RHIC remains vital. The LHC's operating time for ions is limited to about one month per year. RHIC can study a greater number of colliding ion species and different energies over a longer time. RHIC will cease its current operations in 2026. However, the site will continue to be a center for physics. The US Department of Energy has selected the eRHIC design for the future Electron–Ion Collider, or EIC. This new facility will build upon the existing RHIC infrastructure at Brookhaven National Laboratory. It will allow for collisions between positively and negatively charged particles.