International Linear Collider (ILC) Accelerator

The International Linear Collider (ILC) is a 200–500GeV center-of-mass highluminosity linear electron-positron collider, based on 1.3 GHz superconducting accelerating technology (SCRF). The colliding experiment of electron-positron will provide enormous data of the high energy physics, for example, the nature of Higgs particle, not-found particles like super-symmetric particles, and proof of unified theory, and so on. The ILC is the international project for the accelerator design and construction, colliding experiment detectors design and construction, and operation of accelerator and experiment. The ILC accelerator is composed from; • a polarized electron source based on a photocathode DC gun; • a polarized positron source in which positrons are obtained from the main linac electron beam and an undulator; • 5GeV electron and positron damping rings (DR) with a circumference of 3.2km, housed in a common tunnel; • beam transport from the damping rings to the main linacs, followed by a two-stage bunch-compressor system prior to injection into the main linac; • two 11km main linacs (Figure 1), utilizing 1.3GHz SCRF cavities operating at an average gradient of 31.5MV/m, with a pulse length of 1.6ms; two beam-delivery systems, each 2.2km long, which bring the beams into collision with a 14mrad crossing angle, at a single interaction point which can be occupied by two detectors. The total footprint of the ILC complex is ∼31km long. In there, total 22km (major part) is occupied by the SCRF main linacs. The key technology of the ILC Accelerator is the superconducting cavity, which is cool-downed to 2K and operated at high accelerating gradient of 31.5MV/m for total ~15000 cavities. High production yield having specified performance, high operational reliability are required. The paper will make introduction of the ILC accelerator and the key technology of SCRF, and the plan of project realization.