Towards an Advanced Linear International Collider

TL;DR

This paper reviews the current status and future steps for advanced and novel accelerator technologies, aiming to develop high-gradient accelerators for future high-energy physics colliders, especially the Advanced Linear Collider.

Contribution

It provides a comprehensive overview of advanced accelerator techniques, their scientific priorities, and implementation steps for future high-energy physics applications, coordinated by the ALEGRO group.

Findings

Detailed status of accelerator techniques in the GeV range or above

Identification of scientific priorities for each acceleration method

Coordination of community efforts through workshops and strategic planning

Abstract

This document provides detailed information on the status of Advanced and Novel Accelerators techniques and describes the steps that need to be envisaged for their implementation in future accelerators, in particular for high energy physics applications. It complements the overview prepared for the update of the European Strategy for particle physics, and provides a detailed description of the field. The scientific priorities of the community are described for each technique of acceleration able to achieve accelerating gradient in the GeV~range or above. ALEGRO working group leaders have coordinated the preparation of their working group contribution and contributed to editing the documents. The preparation of this document was coordinated by the Advanced LinEar collider study GROup, ALEGRO. The content was defined through discussions at the ALEGRO workshop in Oxford UK, March 2018, and an advanced draft was discussed during a one day meeting prior to the AAC workshop in Breckenridge, CO, USA, August 2018. This document was submitted as an addendum to the ALEGRO submission to the European Strategy for Particle Physics.