28 research outputs found
FIB-SEM investigation and uniaxial compression of flexible graphite
Flexible graphite (FG) with 1 - 1.2 g/cm density is employed as beam
energy absorber material in the CERN's Large Hadron Collider (LHC) beam dumping
system. However, the increase of energy deposited expected for new HL-LHC
(High-Luminosity LHC) design demanded for an improvement in reliability and
safety of beam dumping devices, and the need for a calibrated material model
suitable for high-level FE simulations has been prioritized. This work sets the
basic knowledge to develop a material model for FG suitable to this aim. A
review of the FG properties available in literature is first given, followed by
FIB-SEM (Focused Ion Beam - Scanning Electron Microscopy) microstructure
investigation and monotonic and cyclic uniaxial compression tests. Similarities
with other well-known groups of materials such as crushable foams, crumpled
materials and compacted powders have been discussed. A simple 1D
phenomenological model has been used to fit the experimental stress-strain
curves and the accuracy of the result supports the assumptions that the
graphite-like microstructure and the crumpled meso-structure play the major
role under out-of-plane uniaxial compression.Comment: Pre-print template, 57 pages, 14 figure
Towards a Muon Collider
A muon collider would enable the big jump ahead in energy reach that is
needed for a fruitful exploration of fundamental interactions. The challenges
of producing muon collisions at high luminosity and 10 TeV centre of mass
energy are being investigated by the recently-formed International Muon
Collider Collaboration. This Review summarises the status and the recent
advances on muon colliders design, physics and detector studies. The aim is to
provide a global perspective of the field and to outline directions for future
work.Comment: 118 pages, 103 figure
Towards a muon collider
A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions at high luminosity and 10 TeV centre of mass energy are being investigated by the recently-formed International Muon Collider Collaboration. This Review summarises the status and the recent advances on muon colliders design, physics and detector studies. The aim is to provide a global perspective of the field and to outline directions for future work
Towards a muon collider
A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions at high luminosity and 10 TeV centre of mass energy are being investigated by the recently-formed International Muon Collider Collaboration. This Review summarises the status and the recent advances on muon colliders design, physics and detector studies. The aim is to provide a global perspective of the field and to outline directions for future work
Erratum: Towards a muon collider
The original online version of this article was revised: The additional reference [139] has been added. Tao Han’s ORICD ID has been incorrectly assigned to Chengcheng Han and Chengcheng Han’s ORCID ID to Tao Han. Yang Ma’s ORCID ID has been incorrectly assigned to Lianliang Ma, and Lianliang Ma’s ORCID ID to Yang Ma. The original article has been corrected
Installation of the third generation n_TOF spallation target in the target pit
The installation of a new-generation neutron spallation target at the Neutron Time-Of-Flight (n_TOF) facility marks the beginning of a new era for the collaboration and makes n_TOF ready for 10 more years of research with third-generation neutron spallation target
Third-Generation CERN n_TOF Spallation Target: Final Design and Examinations of Irradiated Prototype
The new neutron spallation target for the CERN neutron Time-Of-Flight (n_TOF) facility is based on a nitrogen-cooled Pb core impacted by short high-intensity proton beam pulses. An extensive material characterization campaign has been carried out to define the constitutive behavior of lead and assess its response under pulsed proton beam irradiation. The activities carried out include a beam irradiation test in the CERN HiRadMat facility. The tests and inspections performed show a robust behavior of the core material during operation and prominent static hardening recovery already at room temperature
Muon Collider Graphite Target Studies and Demonstrator Layout Possibilities at CERN
Muon colliders offer enormous potential for research of the particle physics frontier. Leptons can be accelerated without suffering large synchrotron radiation losses. The International Muon Collider Collaboration is considering 3 and 10 TeV (CM) machines for a conceptual stage. In the core of the Muon Collider facility lays a MW class production target, which will absorb a high power (1 and 3 MW) proton beam to produce muons via pion decay. The target must withstand high dynamic thermal loads induced by 2 ns pulses at 5-50 Hz. Also, operational reliability must be guaranteed to reduce target exchanges to a minimum. Several technologies for these systems are being studied in different laboratories. We present in this paper the results of a preliminary feasibility study of a graphite-based target, and the different layouts under study for a demonstrator target complex at CERN. Synergies with advanced nuclear systems are being explored for the development of a liquid metal target