The International Linear Collider (Report to Snowmass 2021)

Abstract

The International Linear Collider (ILC) is on the table now as a new global energyfrontier accelerator laboratory taking data in the 2030's. The ILC addresses key questions for our current understanding of particle physics. It is based on a proven accelerator technology. Its experiments will challenge the Standard Model of particle physics and will provide a new window to look beyond it. This document brings the story of the ILC up to date, emphasizing its strong physics motivation, its readiness for construction, and the opportunity it presents to the US and the global particle physics community.

Report of the Snowmass 2021 Collider Implementation Task Force

“…[21,22] In this section, we focus on high energy lepton colliders with E CM in the range of 1 -20 TeV. Proposals in this range include CLIC [9], CCC [23], ILC [14], Muon Collider [24], ReLiC [15], and Wake Field Accelerators [25][26] [27]. It was also proposed to use high power Free Electron Lasers to produce a second interaction region with high-energy and high luminosity gamma-gamma collisions at a highenergy electron-positron collider [28].…”

“…At this time, there are two well developed design concepts, the ILC [14] and CLIC [57], with detailed design reports, cost estimates, and supported with extensive beam physics simulations as well as many test facilities to verify the individual subsystems of the colliders. Both projects have cost estimates of less than 10B ILCU and take roughly 10 years to construct.…”

U.S. National Accelerator R&D Program on Future Colliders

“…Examples of R&D topics that could be addressed are described in the white paper discussing future collider options [2] and several papers on individual collider concepts [ [4,5,6,7,8,9,10,11]. The budget for the national program will need to be worked out in the process of prioritizing and selecting R&D projects.…”

Report of the Topical Group on Environmental and Societal Impacts of Particle Physics for Snowmass 2021

“…As described in [5], another proposed future collider is the International Linear Collider, which would collide electrons and positrons at various center-of-mass energies ranging from 250 GeV in an initial phase and eventually reaching 1 TeV. The total power consumption of such a collider has been estimated to range from Report of the Topical Group on Environmental and Societal Impacts of Particle Physics for Snowmass 2021…”

“…A total of five white papers were submitted for consideration by the topical group. Three were related to the environmental impacts of particle physics [4,5,6], another provided case studies of interactions of different laboratories with their local communities [7], and the final one discussed how particle physics experiments can be used to support nuclear non-proliferation efforts [8]. In the following sections, we provide a summary of these papers and the recommendations they made to help ensure the long-term success of our field.…”