Abstract
In this paper, we present a simplified vibration model of the silicon detector (SiD), where the final doublet (QD0) is captured inside the detector and the penultimate magnet (QF1) is inside the machine tunnel. Ground motion spectra measured at the detector hall at SLAC have been used together with a spectrum of the technical noise on the detector. The model predicts that the maximum level of rms (root mean square) vibration seen by QD0 is well below the capture range of the interaction point (IP) feedback system available in the ILC. With the addition of an active stabilization system on QD0, it is also possible to get closer to the stability requirements of the compact linear collider (CLIC). These results can have important implications for CLIC.
Highlights
Ground motion and mechanical vibration can be major sources of luminosity loss at the final focus system (FFS) of future linear colliders, where the beams are nanometric and are required to be stable to better than a fraction of their size [1]
Reliable vibration models are needed during the design process to establish the effectiveness of the supporting scheme to be adopted to protect the FFS from external vibration sources [2]
The goal in the ILC has been to keep the incoming jitter to less than 200 nm, where the resultant luminosity loss is calculated to be less than 4% [4]
Summary
Ground motion and mechanical vibration can be major sources of luminosity loss at the final focus system (FFS) of future linear colliders, where the beams are nanometric and are required to be stable to better than a fraction of their size [1]. For the CLIC [5,6,7] beam structure intratrain feedback is less efficient and a combination of a careful design of the support structures with an active stabilization system is required [8,9,10], in combination with a repositioning system [11] and a preisolator [12].
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