Updated baseline for a staged Compact Linear Collider

TL;DR

This paper proposes an updated staged development plan for the Compact Linear Collider, optimizing performance, cost, and physics potential across three energy stages from 380 GeV to 3 TeV over 22 years.

Contribution

It introduces a comprehensive, optimized staging scenario for CLIC, including an alternative drive beam scheme for the initial stage, based on performance and physics goals.

Findings

Optimal energy stages identified at 380 GeV, 1.5 TeV, and 3 TeV.

Performance, cost, and power consumption analyzed for each stage.

Alternative drive beam scheme using X-band klystrons proposed for the first stage.

Abstract

The Compact Linear Collider (CLIC) is a multi-TeV high-luminosity linear e+e- collider under development. For an optimal exploitation of its physics potential, CLIC is foreseen to be built and operated in a staged approach with three centre-of-mass energy stages ranging from a few hundred GeV up to 3 TeV. The first stage will focus on precision Standard Model physics, in particular Higgs and top-quark measurements. Subsequent stages will focus on measurements of rare Higgs processes, as well as searches for new physics processes and precision measurements of new states, e.g. states previously discovered at LHC or at CLIC itself. In the 2012 CLIC Conceptual Design Report, a fully optimised 3 TeV collider was presented, while the proposed lower energy stages were not studied to the same level of detail. This report presents an updated baseline staging scenario for CLIC. The scenario is the result of a comprehensive study addressing the performance, cost and power of the CLIC accelerator complex as a function of centre-of-mass energy and it targets optimal physics output based on the current physics landscape. The optimised staging scenario foresees three main centre-of-mass energy stages at 380 GeV, 1.5 TeV and 3 TeV for a full CLIC programme spanning 22 years. For the first stage, an alternative to the CLIC drive beam scheme is presented in which the main linac power is produced using X-band klystrons.