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Alignment & stability challenges for FCC-ee

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Transverse mode coupling instability of colliding beams

Xavier Buffat, Tatiana Pieloni, Nicolas Frank Mounet

In high brightness circular colliders, coherent and incoherent beam dynamics are dominated by beam-beam interactions. It is generally assumed that the incoherent tune spread introduced by the beam-beam interactions is sufficiently large to cure any instabi ...

American Physical Society2014

Laboratory Investigation on Seismic Response of Rock Fractures Filled with Granular Materials

Wei Wu

Filling materials may exist in all scales of rock fractures, not only influencing seismic wave attenuation, but controlling rock mass instability. The objective of this study is to experimentally investigate the seismic response of rock fractures filled wi ...

EPFL2013

A Large Hadron Electron Collider at CERN. Report on the Physics and Design Concepts for Machine and Detector

Tatiana Pieloni, Stephan Russenschuck, Werner Friedrich Herr, Yan Hao, Ngoc Thanh Trinh, José Luis Abelleira Fernández, Frank Zimmermann

The physics programme and the design are described of a new collider for particle and nuclear physics, the Large Hadron Electron Collider (LHeC), in which a newly built electron beam of 60 GeV, to possibly 140 GeV, energy collides with the intense hadron b ...

Iop Publishing Ltd2012

The Large Hadron Collider (LHC) is designed to collide two proton beams with unprecedented particle energy of 7 TeV. Each beam comprises 2808 bunches and the separation between two neighboring bunches is 25 ns. The energy stored in each beam is 362 MJ, suf ...

2012

Seismic vulnerability assessment to slight damage based on experimental modal parameters

Clotaire Michel

The aim of this paper is to adjust behaviour models for each class of structure for vulnerability assessment by using ambient vibration. A simple model based on frequencies, mode shapes and damping, taken from ambient vibrations, allows computation of the ...

2012

Simulation of Linear Beam Parameters to Minimize the Duration of the Squeeze in the LHC

Xavier Buffat

The betatron squeeze allows to increase the luminosity of a collider by reducing the β function at the interaction points. This operation has shown to be very critical in pre- vious colliders. In this state of mind, the squeezing was performed extremely sa ...

2011

Analysis of stochastic seismic wave interaction with a slippery rock fault

Jian Zhao

Stochastic seismic wave interaction with a slippery rock fault is studied, based on the principle of conservation of momentum at the wave fronts along the fault. By using the displacement discontinuity method, the wave propagation equations are derived for ...

Springer Verlag2011

Bent-crystal channeling is a technique with a potential to increase beam-halo collimation efficiency in high-energy colliders. First measurements at the Tevatron in 2005 have shown that using a thin silicon crystal to deflect the 1-TeV proton beam halo ont ...

2010

The next generation of superconducting magnets for the interaction regions of particle colliders, as well as for fast cycled accelerators, will be confronted with large heat loads. In order to improve the evacuation of heat from the Nb-Ti coil towards He-I ...

2010

Colliders use final focus systems to reduce the transverse beam sizes at the interaction point in order to increase collision event rates. The maximum focal strength (gradient) of the quadrupoles, and the maximum beam size in them, together limit the beam ...

2008