1 - 9

4th Concept Detector
One of the three detector concepts for the ILC.

Further reading: ILC Detectors


A - C

Asian Committee for Future Accelerators
Founded in 1996, the Asian Committee for Future Accelerators seeks to strengthen ties in accelerator-based science among Asian countries. It makes recommendations to governments about future projects and works closely together with ICFA.

Further reading: The Asian Accelerator Plaza website

American Linear Collider Physics Group
The ALCPG manages the process of establishing an experimental programme in the Americas for the International Linear Collider.

Accelerator Test Facility
A test facility at KEK, ATF is a test accelerator focused on generating the superlow-emittance beam, an essential characteristic of a beam at the ILC.

Accelerator Test Facility 2
An extension to the ATF at KEK, ATF2 is an international project that will build and operate a test facility for the final focus system for the ILC. It is supposed to create a tightly focused, stable beam by making use of the small emittance from ATF. It started up in January 2009.

Beam Delivery and Interaction Region

Calorimeter for the Linear Collider Experiment
International R&D collaboration to develop a high-granularity calorimeter optimised for the ILC. The group consists of about 297 physicists and engineers from 53 institutes and 17 countries coming from four regions (Africa, America, Asia and Europe)

European Organization for Nuclear Research
The particle physics laboratory in Geneva, Switzerland, is one of the world's largest centres for scientific research. It is the site of the Large Hadron Collider and has 20 member states.

Compact Linear Collider Study

A proposed linear collider under study by an international group based at CERN. The proposal is for a collider that could reach energies of 5 TeV. The ILC and CLIC share common activities and collaborate on many items such as conventional facilities, beam delivery system, detectors, physics, cost estimation, etc.


D - F

Detector Concept Report
Delivered to the Global Design Effor at the end of 2006, the DCR describes the physics motivation and capabilities of the ILC and was published at the same time as the Reference Design Report in 2007.

Deutsches Elektronen-Synchrotron

Laboratory located in Hamburg, Germany. It is the site of the HERA accelerator, which hosts the ZEUS and H1 experiments, and the European X-ray free electron laser (XFEL).

Digital Hadron Calorimeter
The digital hadron calorimeter is a project that the CALICE collaboration pursues for ILC detectors.

Department of Energy
One of the principal federal agencies supporting research in the physical sciences in the United States. Through its Office of Science it provides approximately 90% of the support for High Energy and Nuclear Physics.

Executive Committee
The Executive Committee coordinates the activities of the GDE (Global Design Effort). Its members meet once a week per teleconference and face-to-face every few months. It is comprised of ILC Director Barry Barish, the three regional directors – Michael Harrison (Americas), Kaoru Yokoya (Asia), and Brian Foster (Europe) , the three project managers – Marc Ross (Fermilab), Akira Yamamoto (KEK), and Nick Walker (DESY) – and experts who work on integration and costing issues. More experts may be added to the committee in the coming years.

View Global Design Effort organisation chart

Read meeting notes

Electromagnetic CALorimeter
Part of a particle detector that measures the momentum of the particles passing through it. It is optimised for electrons and photons. (see also HCAL)

European Committee for Future Accelerators
Its members are in charge of long-term planning of high-energy facilities in Europe to ensure a valid research programme and a balance between national and international labs and universities as well as a balance between research and education. It is split into Plenary and Restricted ECFA.

Electronic Document Management System
A critical tool for managing the thousands of documents, talks, diagrams and graphics needed for designing the International Linear Collider.

Further reading: Barry Barish on EDMS

European Particle Accelerator Conference
Major European conference that takes place every two years and brings together the latest developments in accelerator R&D.

European Steering Group on Accelerator R&D
International group that optimises and enhances research and technical development in the field of accelerator physics in Europe by promoting mutual coordination and the pooling of European resources promoting for a coordinated utilisation and development of infrastructures.

European Detector R&D towards the International Linear Collider
European-funded R&D project for research on future ILC detectors. It comprises 31 European institutes from 12 different countries and 20 international associates.

Funding Agencies for the Linear Collider
Group of representatives from funding agencies and governments around the world that will develop international funding mechanisms for the International Linear Collider.

Fermilab / FNAL
Fermi National Accelerator Laboratory
A laboratory, operated by the Department of Energy, located in Batavia, Illinois, US. It is the site of the machine that currently operates at the highest energy in the world, the Tevatron.


G - I

Global Design Effort
The Global Design Effort is an international team of more than 60 scientists and engineers, who sets the design and priorities for building the next-generation particle accelerator – the International Linear Collider.

GEometry ANd Tracking
A software toolkit used for high energy, nuclear and accelerator physics that simulates the passage of particles through matter.

Gas Electron Multiplier
The Gas Electron Multiplier is a proposed particle detector technology for a digital hadron calorimeter (see also DHCAL) in an ILC detector.

From ILC NewsLine: Fermilab users conduct ILC detector beam test

Global Large Detector
Former detector concept for the ILC which is now merged with LDC to form the ILD detector concept (see ILD).

From ILC NewsLine: ILC Detectors in the Making: Global Large Detector

Hadron CALorimeter
Calorimeter optimised for incident hadrons, usually placed behind an electromagnetic calorimeter which fully contains electromagnetic showers.

International Committee for Future Accelerators
Created in 1976, ICFA facilitates international collaboration in the construction and use of particle accelerators for high energy physics.

International Linear Collider

A proposed electron-positron collider, the ILC will complement the Large Hadron Collider, a proton-proton collider at the European Centre for Nuclear Research (CERN) in Geneva, Switzerland. Consisting of two linear accelerators that face each other, the ILC will hurl some 10 billion electrons and their anti-particles, positrons, toward each other at nearly the speed of light. Stretching approximately 31 kilometres in length, the beams collide 14,000 times every second at extremely high energies – 500 billion-electron-volts (GeV). The current baseline design allows for an upgrade to a 50-kilometre, 1 trillion-electron-volt (TeV) machine during the second stage of the project. The ILC will be designed, funded, managed, and operated as a fully international scientific project.

ILC Polarised Electron Source
A polarised electron source generates particles that all spin in the same direction, consisting of an electron gun with a photocathode, a laser system and associated support systems such as vacuum and instrumentation.

The ILC-PES Study Group specifies performance parameters, develops a detailed initial design and identifies needed R&D for the polarised electron source in the ILC.

International Linear Collider Steering Committee
The primary role of the Steering Committee is to promote the construction of an Electron-Positron Linear Collider through worldwide collaboration. In so doing the Committee will give particular attention to Outreach, Science, Technology and Organisation of the linear collider project.

International Linear Collider Test Area at Fermilab
The ILCTA comprised of the ILCTA-Meson Detector Building and ILCTA-New Muon, is a test area at Fermilab for the International Linear Collider.

International Large Detector
One of the three detector concepts for the International Linear Collider. It is a combined concept of the former Large Detector Concept (LDC) and Global Large Detector (GLD).

Further reading: ILC Detectors

International Technology Recommendation Panel

The committee charged with recommending a Linear Collider technology to the International Linear Collider Steering Committee. In August 2004, this committee recommended cold technology for the International Linear Collider.

Further reading: Directorate and Committees


J - L

Japan High Energy Physics Committee
Charged with supporting high-energy physics activities in Japan. In 2005 the JHEPC issued a request to the Science Council of Japan to endorse a solid commitment to the ILC.

A high energy physics laboratory located near Tokyo, Japan. It houses the BELLE experiment, as well as the accelerator used in the K2K experiment.

Linear Collider: Accelerator and Beam Delivery
A consortium of UK institute aiming to develop new techniques for the control of relativistic particle beams at the nanometre level of precision.

Linear Collider Forum Of the Americas
The LCFOA provides a partnership between its industry members and government funded R&D efforts during the design, component manufacturing and siting of the ILC.

Linear Collider -Time Projection Chamber
A working group devoted to understanding how to build a high-performance Time Projection Chamber for the International Linear Collider.

Large Detector Concept
Former detector concept for the ILC that has merged with LDC to form the ILD detector concept

Low Emittance Transport
In a low emittance beam, the particles are confined to a small space and have similar momentum. The lower the emittance, the easier it is to focus the beam and more particle collisions occur. The LET workgroup will survey the beam from the damping ring to the interaction point to insure low emittance beams for the International Linear Collider.

Large Hadron Collider

A 14 TeV proton-proton collider at the CERN laboratory in Geneva, Switzerland which started on 10 September 2008.


M - O

Monolithic Active Pixel Sensors
High-speed, precise, low mass and low power devices used in particle detectors.

Machine Detector Interface
The Machine Detector Interface group evaluates how the ILC design will have an impact on the detector and physics capabilities of the machine. The group also analyses how the experimental requirements for the machine will have an impact on the ILC design.

MICRO-MEsh GASeous detector
A detector concept first developed at CERN, Micromegas has demonstrated promise for handling high data rates with a low-cost structure.

Machine Protection System
This group is developing the Machine Protection System for the ILC.


P - R

Particle Flow Algorithm
Like putting a very complicated puzzle together, a particle flow algorithm matches specific hits in the detector to particle showers, allowing physicists to analyse the collision.

Reference Design Report

Released in August 2007, the RDR contains a detailed design for the International Linear Collider, including a chapter on the physics goals of the machine, a Detector Concept Report and costing estimates.

Restricted ECFA

One of the sub-committees of the European Committee for Future Accelerators. The Restricted ECFA is composed of one member per country and advises the ECFA chairman and secretary.

The portion of the electromagnetic spectrum in which electromagnetic waves can be generated by alternating current.


S - U

Superconducting Radiofrequency
Superconducting radiofrequency cavities are at the heart of the technology in the International Linear Collider. The ILC will use a voltage generator to fill a hollow structure called a cavity with an electric field. Made out of pure niobium, the cavities will be chilled to near absolute zero temperatures of 2 kelvin, giving them have almost no electrical resistance and making them superconducting structures. Inside the cavities, the voltage of the field changes with a certain frequency - a radio frequency. Charged particles feel the force of the electric field and accelerate. Build a cavity made of a superconductor, chill it to near absolute zero, and you will have a superconducting rf cavity. String enough of these cavities together, and you will have a particle accelerator.

Silicon Detector
One of the three detector concepts for the International Linear Collider.

Further reading: ILC Detectors

Silicon for the Linear Collider
SILC is an international R&D collaboration that is pursuing ways to develop the next generation of silicon tracking systems for a linear collider.

Stanford Linear Accelerator Center
Located in Menlo Park, California, this Department of Energy laboratory is the site of the BaBar experiment.

Silicon-on-Insulator detectors

Superconducting RF
(see SCRF)

Superconducting RF Test Facility
STF is a project at KEK to build and operate a test linac with high-gradient superconducting cavities, as a prototype of the main linac systems for ILC.

A hypothetical symmetry relating particles of different spins. Under this symmetry, matter particles (spin one-half fermions) are related to force particles (spin-zero or spin-one bosons).

Technical Design Report
The Global Design Effort plans to write a Technical Design Report, the final report which will include specific details and schematics, for the International Linear Collider in 2012.

TeV Energy Superconducting Linear Accelerator

The TESLA Technology Collaboration strives to advance superconducting RF technology R&D and related accelerator studies across the broad diversity of scientific applications.

Time Projection Chamber
A Time Projection Chamber is a gas-filled cylindrical chamber that acts like a three-dimensional electronic camera, making a photo-copy of a particle track as it flies through the detector. (see also LC-TPC)

TESLA Technology Collaboration
(see TESLA)

TESLA Test Facility

A test facility at DESY.

University Consortium for Linear Collider R&D
The UCLC is a consortium of groups from more than 50 US universities, 7 national laboratories and 23 foreign institutions engaged in R&D for an International Linear Collider.


V - Z

Common abbreviation for vertex.

Worldwide Study of the Physics and Detectors for Future Linear e+e- Colliders

WWS Coordinates the work of the three regional studies: ECFA, ALCPG and ACFA. Results of the studies are combined in Linear Collider Workshops, held on an annual basis.

X-Ray Free Electron Laser

The European X-Ray Laser Project at DESY.

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