New generation electron-positron factories

TL;DR

This paper reviews the evolution of electron-positron colliders, discusses the Crab Waist collision scheme's potential to significantly increase luminosity, and describes upcoming collider projects utilizing this innovative approach.

Contribution

It introduces the Crab Waist collision scheme as a promising method to enhance collider luminosity and discusses its successful testing and potential for next-generation factories.

Findings

Crab Waist scheme successfully tested at DAFNE.

Next-generation factories aim to implement CW for higher luminosity.

Potential to increase luminosity by 1-2 orders of magnitude.

Abstract

In 2010 we celebrated 50 years since commissioning of the first particle storage ring ADA in Frascati (Italy) that also became the first electron-positron collider in 1964. After that date the particle colliders have increased their intensity, luminosity and energy by several orders of magnitude. Namely, because of the high stored beam currents and high rate of useful physics events (luminosity) the modern electron-positron colliders are called "factories". However, the fundamental physics has required luminosities by 1-2 orders of magnitudes higher with respect to those presently achieved. This task can be accomplished by designing a new generation of factories exploiting the potential of a new collision scheme based on the Crab Waist (CW) collision concept recently proposed and successfully tested at Frascati. In this paper we discuss the performance and limitations of the present generation electron-positron factories and give a brief overview of new ideas and collision schemes proposed for further collider luminosity increase. In more detail we describe the CW collision concept and the results of the crab waist collision tests in DAFNE, the Italian PHi-factory. Finally, we briefly describe most advanced projects of the next generation factories based on the CW concept: SuperB in Italy, SuperKEKB in Japan and SuperC-Tau in Russia.