Future e+ e- Flavor Factories: accelerator challenges

TL;DR

This paper reviews the challenges and advancements in future electron-positron flavor factories, focusing on accelerator upgrades like Super-KEKB and SuperB that aim for significantly higher luminosity through innovative techniques.

Contribution

It compares two major upgrade approaches for flavor factories, highlighting novel collision schemes and hardware challenges to achieve higher luminosity.

Findings

Super-KEKB faces hardware challenges due to high beam intensity and short bunches.

SuperB employs a new collision scheme, the crab waist, to increase luminosity without higher beam currents.

Both projects aim for about two orders of magnitude increase in luminosity.

Abstract

Operation of the B-Factories (PEP-II and KEKB) has been very successful, both having exceeded their design peak and integrated luminosity and provided a huge amount of good data to the experiments. Proposal for upgrades, in order to achieve about two order of magnitude larger luminosity, are in progress in Japan, with Super-KEKB, and in Europe, with SuperB. Very high beam intensity, very short bunch length and low Interaction Point beta-functions are the key points of the Japanese design, very challenging for the hardware components (RF, vacuum). On the other hand SuperB exploits a new collision scheme, namely large Piwinski angle and "crab waist", which will allow to reach a luminosity two order of magnitude larger without increasing beam currents and decreasing bunch lengths. In this talk the present status of the two projects will be reviewed.