Conceptual design and scaled experimental validation of an actively damped carbon tie rods support system for the stabilization of future particle collider superstructures

Abstract

This paper presents a simple solution to increase the stability of the large superstructures supporting the final electromagnets of future linear particle collider. It consists of active carbon fiber tie rods, fixed at one end on the structure and at the other end to the detector through active tendons. In the first part of the paper, the solution has been tested on a finite element model of one half of the CLIC_ILD final focus structure. With a reasonable design, it is shown numerically that the compliance can be decreased by at least a factor 4, i.e., that the structure is 4 times more robust to technical noise at low frequency. Two additional features of the active rods are that they can also actively damp the structural resonances and realign the superstructures. The second part of the paper presents a successful experimental validation of the concept, applied to a scaled test bench, especially designed to contain the same modal characteristics as the full scale superstructure.

An active control concept for the TALC space telescope

“…Such a strategy has already been successfully applied to other large structures, e.g. for particle collider [4] or gravitational wave detector [5]. The details of the control strategy can be found in these references, and an improvement of the strategy can be found here [6].…”

ℋ∞ optimization of an integral force feedback controller

“…Accordingly, the optimal gain is set to minimize the maximum steady state response of the structure. The presented optimal tuning law is preferred when the system is being continuously disturbed, for example, in the applications of the facilities dedicated to experimental physics (Meimon et al., 2010; Collette et al., 2013; Sivo et al., 2014). The optimal feedback gain under the ℋ ∞ optimization criterion is firstly derived in a closed-form formulation for a single degree of freedom (SDOF) system and then for a two Degrees of freedom (TDOF) system.…”

Enhanced Damping of Flexible Structures Using Force Feedback

“…O VER the years, an increasing number of applications require both large and rigid structures, which are, by essence, conflicting requirements. Emblematic examples are found in the high-technology industry (e.g., lithography machines), in aerospace applications [1][2][3], in civil engineering, and in facilities dedicated to experimental physics (large segmented telescopes, synchrotrons, particle accelerators) [4]. To some extent, the disturbing effect of spurious structural resonances can be mitigated by adding active damping over a large bandwidth.…”