Measurement and vibration studies on the final focus doublet at Daphne and new collider implications

TL;DR

This study measures vibrations in the Daphne collider's final focus doublet to understand their impact on luminosity and beam stability, informing design improvements for future high-luminosity colliders.

Contribution

It provides the first detailed vibration analysis of Daphne's final focus doublet and discusses stabilization techniques relevant for next-generation collider designs.

Findings

Vibration sensitivity affects luminosity and beam stability.

Stabilization techniques can mitigate ground motion effects.

Implications for future collider final focus design.

Abstract

A Super Flavour Factory, to be built in the Tor Vergata University campus near Frascati, Italy, will have nano-beams in order to reach a design luminosity two orders of magnitude higher than the present state of the art. The knowledge and compensation of the vibrations induced on the beams by the anthropic noise is then fundamental. The Daphne Phi-factory at LNF, Frascati, was upgraded in the second half of 2007 in order to implement the large Piwinski angle and crab waist collision scheme [1] and in 2010 the KLOE experiment was rolled in for a new data taking and physic program [2]. A vibration measurement campaign has been performed in Daphne to find out the actual vibration sensitivity of the final focus doublets. Vibration measurements were performed on the final focus doublet because of luminosity losses and photon beam lines instability observations. Measurement results and stabilization technique to mitigate the effects of the ground motion induced by the "cultural noise" are presented. Implications of this experience on the design and stabilization of the super flavour factory final focus doublets will be discussed.