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International Linear Collider
(c) KEK/Rey. Hori
The International Linear Collider (ILC)
The International Linear Collider (ILC) is a proposed particle accelerator that is currently being designed and developed through international cooperation. Within its 20km long tunnel in the Kitakami Mountains, electrons and positrons would be accelorated to a speed close to light and smashed together head on in the middle of the tunnel. The analysis of the collisions is expected to result in new knowledge regarding the creation of the universe, time and space, and mass itself, by ‘recreating’ the Big Bang.
World class researchers and scientists from around the world are expected to gather to the Kitakami Site, forming an international hub for international research spanning decades.
ILC KEYWORDS
International Linear Collider
The International Linear Collider is a next-generation colliding-beam accelerator, often abbreviated as the ILC. The next-generation model touts a linear accelerator which overcomes the limitation of a circular accelerator, which loses more energy when bending the electron orbit into a circular shape and thus cannot achieve a target energy level. This necessitated a large linear accelerator like the ILC.
CERN
CERN or the European Organization for Nuclear Research is located just outside of Geneva, Switzerland near the French border. It is the largest research institute for particle physics in the world and the Large Hadron Collider (LHC) is part of it. The acronym CERN comes from the name of a preliminary organization called Conseil Européen pour la Recherche Nucléaire.
Positron
The opposite (antiparticle) of an electron. A positron has a positive charge, in opposition to the electron’s negative charge.
The Big Bang
The giant explosion that occurred at the beginning of the universe. According to the Big Bang theory, the universe started approximately 13.7 billion years ago with an explosion (the Big Bang), and as the universe expanded, elementary particles, atoms, molecules, stars, and galaxies were created.
Elementary Particles and the Higgs boson
Modern science assumes that elementary particles are the most fundamental unit that composes the world. It is the smallest unit that matter is composed of. There are 17 types of elementary particles confirmed in the standard model of physics including matter-compositing particles, force-carrying particles, and the Higgs boson that gives elementary particles mass.
The existence of mass is a mystery to us. Our mass is due to the kinetic energy of quarks (elementary particles composing matter) moving close to the speed of light. However, the electrons that support our daily lives are found to have mass as well. Electrons are elementary particles, in other words, they have nothing inside, or no kinetic energy in them.
Then why do electrons have mass? The Higgs boson explains this. According to the theory, the Higgs boson in the vacuum prevents electrons from moving. If the Higgs boson really exists in the vacuum, adding great energy would send the Higgs boson particles out.
This is what the ILC is trying to experiment on.
The Higgs boson has a completely different nature from other particles. One aspect of this is that they have zero “spin.” Why is that? Isn’t there anything related to them? We need a super-advanced accelerator, the ILC to solve this mystery.
Collidng-beam accelorator
A colliding-beam accelerator accelerates particles by adding energy to them using electromagnetic waves. It forces accelerated particles to collide with each other and observes various particles emerging from clusters of energy created by the colliding particles. The faster the accelerated particles, the greater the energy that is created to generate rarer particles.
The ILC accelerates electrons and positrons up to their ultimate speed of light to achieve the level of ultrahigh energy close to the beginning of the universe.
Superconducting acceleration
When a substance is cooled down to an extremely low temperature, its electrical resistance drops to zero. This is called superconducting acceleration. The ILC introduces this system utilizing this superconducting acceleration to accelerate
Electric fields are created by sending microwaves into a cavity made of niobium, a superconducting rare alloy, to accelerate electron and positron beams. When it’s cooled down to -264 degrees Celsius (the ILC can operate at down to -271 degrees), a superconducting state is created and thus the electric resistance falls to zero. Since there is no electric power loss or heating, particles are given greater energy for smaller electric power and shorter distances.
Colliding-beam accelerator
A colliding-beam accelerator accelerates particles by adding energy to them using electromagnetic waves. It forces accelerated particles to collide with each other and observes various particles emerging from clusters of energy created by the colliding particles. The faster the accelerated particles, the greater the energy that is created to generate rarer particles.
The ILC accelerates electrons and positrons up to their ultimate speed of light to achieve the level of ultrahigh energy close to the beginning of the universe.
Generation and control of a nano-beam
ILC beams are in an extremely thin ribbon shape and have 10 billion electrons and positrons in them. The size of the beam is 5 nanometers wide at the point of collision. It is as small as 100 hydrogen atoms. They are made small in order to increase the density of electrons and positrons in the beam and increase the frequency of collisions. Electrons and positrons are so small that they don’t seem to have any size and the inside of the beam is hollow even with 10 billion of them.
The ILC adopts technologies to create these ultra-small beams and super technologies to control the colliding point of the beams at a nanometer level of accuracy.