40 research outputs found
Excitation of wakefields in carbon nanotubes: a hydrodynamic model approach
The interactions of charged particles with carbon nanotubes may excite
electromagnetic modes in the electron gas produced in the cylindrical graphene
shell constituting the nanotube wall. This wake effect has recently been
proposed as a potential novel method of short-wavelength high-gradient particle
acceleration. In this work, the excitation of these wakefields is studied by
means of the linearized hydrodynamic model. In this model, the electronic
excitations on the nanotube surface are described treating the electron gas as
a 2D plasma with additional contributions to the fluid momentum equation from
specific solid-state properties of the gas. General expressions are derived for
the excited longitudinal and transverse wakefields. Numerical results are
obtained for a charged particle moving within a carbon nanotube, paraxially to
its axis, showing how the wakefield is affected by parameters such as the
particle velocity and its radial position, the nanotube radius, and a friction
factor, which can be used as a phenomenological parameter to describe effects
from the ionic lattice. Assuming a particle driver propagating on axis at a
given velocity, optimal parameters were obtained to maximize the longitudinal
wakefield amplitude
Application of Nanostructures and Metamaterials in Accelerator Physics
Carbon-based nanostructures and metamaterials offer extraordinary mechanical and opto-electrical properties, which make them suitable for applications in diverse fields, including, for example, bioscience, energy technology and quantum computing. In the latest years, important R&D efforts have been made to investigate the potential use of graphene and carbon-nanotube (CNT) based structures to manipulate and accelerate particle beams. In the same way, the special interaction of graphene and CNTs with charged particles and electromagnetic radiation might open interesting possibilities for the design of compact coherent radiation sources, and novel beam diagnostics techniques as well. This paper gives an overview of novel concepts based on nanostructures and metamaterials with potential application in the field of accelerator physics. Several examples are shown and future prospects discussed
Exploring ultra-high-intensity wakefields in carbon nanotube arrays: An effective plasma-density approach
Studies for a 72.75 MHz Four Vanes CW-RFQ for ECOS-LINCE Project
Presented at the XXXIV Mazurian Lakes Conference on Physics, Piaski, Poland,
September 6–13, 2015.The ECOS is considering the construction of a new facility for accelerating
high intensity stable beams with energies at and above the Coulomb
barrier, the LINCE light and heavy ion accelerator. This facility could
be based on a normal conducting CW-RFQ and a superconducting linac,
working at 72.75 MHz. This paper presents a design study for the RFQ
system which is able to achieve 500 keV/u output for A=Q = 7 ions in only
5 m length
Main Magnets Design Studies for the Non-scaling Fixed Field Alternating Gradient Accelerator for a Final Acceleration Stage of the Neutrino Factory
Abstract The International Design Study of the Neutrino Factory (IDS-NF) aims to design the next generation facility for the precision neutrino oscillation searches. The non scaling Fixed Field Alternating Gradient Accelerator was proposed for the final muon beam acceleration in order to reduce the cost of the final acceleration. A superconducting magnet design based on the independent multipole coils approach using the ROXIE code is presented. The feasibility of the magnet construction together with the quench limitations is discussed
Interim Design Report
The International Design Study for the Neutrino Factory (the IDS-NF) was
established by the community at the ninth "International Workshop on Neutrino
Factories, super-beams, and beta- beams" which was held in Okayama in August
2007. The IDS-NF mandate is to deliver the Reference Design Report (RDR) for
the facility on the timescale of 2012/13. In addition, the mandate for the
study [3] requires an Interim Design Report to be delivered midway through the
project as a step on the way to the RDR. This document, the IDR, has two
functions: it marks the point in the IDS-NF at which the emphasis turns to the
engineering studies required to deliver the RDR and it documents baseline
concepts for the accelerator complex, the neutrino detectors, and the
instrumentation systems. The IDS-NF is, in essence, a site-independent study.
Example sites, CERN, FNAL, and RAL, have been identified to allow site-specific
issues to be addressed in the cost analysis that will be presented in the RDR.
The choice of example sites should not be interpreted as implying a preferred
choice of site for the facility
High intensity neutrino oscillation facilities in Europe
The EUROnu project has studied three possible options for future, high intensity neutrino oscillation facilities in Europe. The first is a Super Beam, in which the neutrinos come from the decay of pions created by bombarding targets with a 4 MW proton beam from the CERN High Power Superconducting Proton Linac. The far detector for this facility is the 500 kt MEMPHYS water Cherenkov, located in the Fréjus tunnel. The second facility is the Neutrino Factory, in which the neutrinos come from the decay of μ+ and μ− beams in a storage ring. The far detector in this case is a 100 kt magnetized iron neutrino detector at a baseline of 2000 km. The third option is a Beta Beam, in which the neutrinos come from the decay of beta emitting isotopes, in particular He6 and Ne18, also stored in a ring. The far detector is also the MEMPHYS detector in the Fréjus tunnel. EUROnu has undertaken conceptual designs of these facilities and studied the performance of the detectors. Based on this, it has determined the physics reach of each facility, in particular for the measurement of CP violation in the lepton sector, and estimated the cost of construction. These have demonstrated that the best facility to build is the Neutrino Factory. However, if a powerful proton driver is constructed for another purpose or if the MEMPHYS detector is built for astroparticle physics, the Super Beam also becomes very attractive
ECOS-LINCE:A high-intensity heavy-ion facility for nuclear structure and reactions
During the last years, the ECOS working group has been considering the construction of a new high-intensity accelerator of stable ion beams for the next Long-Range Plan of the nuclear physics community in Europe. The new facility (LINCE) will be a multi-user facility dedicated to ECOS science: fundamental physics, astrophysics, nuclear structure and reaction dynamics. In this paper, we summarize preliminary design studies of the low-energy part of this facility based on the use of a multi-ion superconducting linac. [ABSTRACT FROM AUTHOR
Interim Design Report
The International Design Study for the Neutrino Factory (the IDS-NF) was established by the community at the ninth International Workshop on Neutrino Factories, super-beams, and beta- beams which was held in Okayama in August 2007. The IDS-NF mandate is to deliver the Reference Design Report (RDR) for the facility on the timescale of 2012/13. In addition, the mandate for the study [3] requires an Interim Design Report to be delivered midway through the project as a step on the way to the RDR. This document, the IDR, has two functions: it marks the point in the IDS-NF at which the emphasis turns to the engineering studies required to deliver the RDR and it documents baseline concepts for the accelerator complex, the neutrino detectors, and the instrumentation systems. The IDS-NF is, in essence, a site-independent study. Example sites, CERN, FNAL, and RAL, have been identified to allow site-specific issues to be addressed in the cost analysis that will be presented in the RDR. The choice of example sites should not be interpreted as implying a preferred choice of site for the facility