•A novel electromechanical structure is proposed for active ground motion isolation.•State of the art disturbance rejection at the subnanometer scale for heavy loads (up to 50kg) is achieved.•A 13dB ...attenuation of the ground motion is obtained between 12Hz and 100Hz.
Vibration isolation is a critical issue in various precision engineering fields. A new design of an active isolation system operating heavy loads (up to 50kg) is presented in this work. This system provides state of the art vibration isolation at the nanometer scale for magnets of a future particle accelerator and is more compact than other studies in this field. The choice of sensors and actuators, the mechanical design and the acquisition electronics are investigated in order to reject ground motion efficiently. A dynamic experimental characterization is performed. Based on the identified model, a specific controller, giving an attenuation between 10Hz and 100Hz was designed and experimentally qualified.
Sub-nanometer active seismic isolator control Balik, Gael; Caron, Bernard; Allibe, Julie ...
Journal of intelligent material systems and structures,
10/2013, Letnik:
24, Številka:
15
Journal Article
Recenzirano
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Ambitious projects such as the design of the future Compact Linear Collider require challenging parameters and technologies. Stabilization of the Compact Linear Collider particle beam is one of these ...challenges. Ground motion is the main source of beam misalignment. Beam dynamics controls are, however, efficient only at low frequency (<4 Hz), due to the sampling of the beam at 50 Hz. Hence, ground motion mitigation techniques such as active stabilization are required. This article shows a dedicated prototype able to manage vibration at a sub-nanometer scale. The use of cutting edge sensor technology is, however, very challenging for control applications as they are usually used for measurement purposes. Limiting factors such as sensor dynamics and noise lead to a performance optimization problem. The current state of the art in ground motion measurement and ground motion mitigation techniques is pointed out and shows limits of the technologies. The proposed active device is then described, and a realistic model of the process has been established. A dedicated controller design combining feedforward and feedback techniques is presented, and theoretical results in terms of power spectral density of displacement are compared to real-time experimental results obtained with a rapid control prototyping tool.
Final results on a CMOS 0.18 µm front-end chip for silicon strips readout are summarized and preliminary results on time measurement are discussed. The status of the next version in 0.13 µm is ...briefly presented.
The \(3 \times 1 \times 1\) m\(^3\) demonstrator is a dual phase liquid argon time projection chamber that has recorded cosmic rays events in 2017 at CERN. The light signal in these detectors is ...crucial to provide precise timing capabilities. The performances of the photon detection system, composed of five PMTs, are discussed. The collected scintillation and electroluminescence light created by passing particles has been studied in various detector conditions. In particular, the scintillation light production and propagation processes have been analyzed and compared to simulations, improving the understanding of some liquid argon properties.
The Compact Linear Collider (CLIC) is a TeV-scale high-luminosity linear \(e^+e^-\) collider under development at CERN. Following the CLIC conceptual design published in 2012, this report provides an ...overview of the CLIC project, its current status, and future developments. It presents the CLIC physics potential and reports on design, technology, and implementation aspects of the accelerator and the detector. CLIC is foreseen to be built and operated in stages, at centre-of-mass energies of 380 GeV, 1.5 TeV and 3 TeV, respectively. CLIC uses a two-beam acceleration scheme, in which 12 GHz accelerating structures are powered via a high-current drive beam. For the first stage, an alternative with X-band klystron powering is also considered. CLIC accelerator optimisation, technical developments and system tests have resulted in an increased energy efficiency (power around 170 MW) for the 380 GeV stage, together with a reduced cost estimate at the level of 6 billion CHF. The detector concept has been refined using improved software tools. Significant progress has been made on detector technology developments for the tracking and calorimetry systems. A wide range of CLIC physics studies has been conducted, both through full detector simulations and parametric studies, together providing a broad overview of the CLIC physics potential. Each of the three energy stages adds cornerstones of the full CLIC physics programme, such as Higgs width and couplings, top-quark properties, Higgs self-coupling, direct searches, and many precision electroweak measurements. The interpretation of the combined results gives crucial and accurate insight into new physics, largely complementary to LHC and HL-LHC. The construction of the first CLIC energy stage could start by 2026. First beams would be available by 2035, marking the beginning of a broad CLIC physics programme spanning 25-30 years.
A 10 kilo-tonne dual-phase liquid argon TPC is one of the detector options considered for the Deep Underground Neutrino Experiment (DUNE). The detector technology relies on amplification of the ...ionisation charge in ultra-pure argon vapour and oers several advantages compared to the traditional single-phase liquid argon TPCs. A 4.2 tonne dual-phase liquid argon TPC prototype, the largest of its kind, with an active volume of 3x1x1 \(m^3\) has been constructed and operated at CERN. In this paper we describe in detail the experimental setup and detector components as well as report on the operation experience. We also present the first results on the achieved charge amplification, prompt scintillation and electroluminescence detection, and purity of the liquid argon from analyses of a collected sample of cosmic ray muons.
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