144 research outputs found
Superconducting RF Technology R&D for Future Accelerator Applications
Superconducting rf technology (SRF) is evolving rapidly as are its
applications. While there is active exploitation of what one may term the
current state-of-the-practice, there is also rapid progress expanding in
several dimensions the accessible and useful parameter space. While
state-of-the-art performance sometimes outpaces thorough understanding, the
improving scientific understanding from active SRF research is clarifying
routes to obtain optimum performance from present materials and opening avenues
beyond the standard bulk niobium. The improving technical basis understanding
is enabling process engineering to both improve performance confidence and
reliability and also unit implementation costs. Increasing confidence in the
technology enables the engineering of new creative application designs. We
attempt to survey this landscape to highlight the potential for future
accelerator applications.Comment: Submitted to Reviews of Accelerator Science and Technolog
Higgs factories
Over the past two decades, the high energy physics community has been
actively discussing and developing a number of post-LHC collider projects;
however, none of them have been approved due to high costs and the uncertainty
in post-LHC physics scenarios. There have been great expectations of rich new
physics in the 0.1-1 TeV mass region: the Higgs boson (one or several),
supersymmetry, or perhaps new particles from the dark-matter family. It has
been the general consensus that the best machine for the detailed study of new
physics to be discovered at the LHC would be an energy-frontier linear e+e-
collider. Physicists held their breath waiting for the results from the LHC. In
summer 2012, two LHC detectors, ATLAS and CMS, announced the discovery of a
Higgs boson with the mass of 126 GeV and (still) nothing else. The absence of
new physics in the region below 1 TeV has changed the post-LHC collider R&D
priorities and triggered a zoo of project proposals for the precision study of
the 126 GeV Higgs boson, possibly with further upgrades to higher energies.
This paper gives an overview of these projects; it is based largely on the
reports presented at the first workshop on Higgs factories held at FNAL a few
days prior to the present workshop in Protvino.Comment: Presented at the workshop LHC on March -IHEP-LHC, 20-22 November
2012, Protvino, Russia, 17 pages, 16 fig
The future prospects of muon colliders and neutrino factories
The potential of muon beams for high energy physics applications is described
along with the challenges of producing high quality muon beams. Two proposed
approaches for delivering high intensity muon beams, a proton driver source and
a positron driver source, are described and compared. The proton driver
concepts are based on the studies from the Muon Accelerator Program (MAP). The
MAP effort focused on a path to deliver muon-based facilities, ranging from
neutrino factories to muon colliders, that could span research needs at both
the intensity and energy frontiers. The Low EMittance Muon Accelerator (LEMMA)
concept, which uses a positron-driven source, provides an attractive path to
very high energy lepton colliders with improved particle backgrounds. The
recent study of a 14 TeV muon collider in the LHC tunnel, which could leverage
the existing CERN injectors and infrastructure and provide physics reach
comparable to the 100 TeV FCC-hh, at lower cost and with cleaner physics
conditions, is also discussed. The present status of the design and R&D efforts
towards each of these sources is described. A summary of important R&D required
to establish a facility path for each concept is also presented.Comment: 29 pages, 17 figure
Continuous wave superconducting radio frequency electron linac for nuclear physics research
CEBAF, the Continuous Electron Beam Accelerator Facility, has been actively
serving the nuclear physics research community as a unique forefront
international resource since 1995. This CW electron linear accelerator (linac)
at the U.S. Department of Energy's Thomas Jefferson National Accelerator
Facility (Jefferson Lab) has continued to evolve as a precision tool for
discerning the structure and dynamics within nuclei. Superconducting RF (SRF)
technology has been the essential foundation for CEBAF, first as a 4 GeV
machine, then 6 GeV, and currently capable of 12 GeV. We review the
development, implementation, and performance of SRF systems for CEBAF from its
early beginnings to the commissioning of the 12 GeV era.Comment: 56 pages, 31 figures, accepted for publication in Physical Review
Accelerators and Beam
Key directions for research and development of superconducting radio frequency cavities
Radio frequency superconductivity is a cornerstone technology for many future
HEP particle accelerators and experiments from colliders to proton drivers for
neutrino facilities to searches for dark matter. While the performance of
superconducting RF (SRF) cavities has improved significantly over the last
decades, and the SRF technology has enabled new applications, the proposed HEP
facilities and experiments pose new challenges. To address these challenges,
the field continues to generate new ideas and there seems to be a vast room for
improvements. In this paper we discuss the key research directions that are
aligned with and address the future HEP needs.Comment: contribution to Snowmass 202
A High-Average-Power Free Electron Laser for Microfabrication and Surface Applications
CEBAF has developed a comprehensive conceptual design of an industrial user facility based on a kilowatt ultraviolet (UV) (160-1000 mm) and infrared (IR) (2-25 micron) free electron laser (FEL) driven by a recirculating, energy recovering 200 MeV superconducting radio frequency (SRF) accelerator. FEL users, CEBAF's partners in the Lase Processing Consortium, including AT&T, DuPont, IBM, Northrop Grumman, 3M, and Xerox, are developing applications such as metal, ceramic, and electronic material micro-fabrication and polymer and metal surface processing, with the overall effort leading to later scale-up to industrial systems at 50-100 kW. Representative applications are described. The proposed high-average-power FEL overcomes limitations of conventional laser sources in available power, cost-effectiveness, tunability, and pulse structure
European Strategy for Particle Physics -- Accelerator R&D Roadmap
The 2020 update of the European Strategy for Particle Physics emphasised the
importance of an intensified and well-coordinated programme of accelerator R&D,
supporting the design and delivery of future particle accelerators in a timely,
affordable and sustainable way. This report sets out a roadmap for European
accelerator R&D for the next five to ten years, covering five topical areas
identified in the Strategy update. The R&D objectives include: improvement of
the performance and cost-performance of magnet and radio-frequency acceleration
systems; investigations of the potential of laser / plasma acceleration and
energy-recovery linac techniques; and development of new concepts for muon
beams and muon colliders. The goal of the roadmap is to document the collective
view of the field on the next steps for the R&D programme, and to provide the
evidence base to support subsequent decisions on prioritisation, resourcing and
implementation.Comment: 270 pages, 58 figures. Editor: N. Mounet. LDG chair: D. Newbold.
Panel chairs: P. V\'edrine (HFM), S. Bousson (RF), R. Assmann (plasma), D.
Schulte (muon), M. Klein (ERL). Panel editors: B. Baudouy (HFM), L. Bottura
(HFM), S. Bousson (RF), G. Burt (RF), R. Assmann (plasma), E. Gschwendtner
(plasma), R. Ischebeck (plasma), C. Rogers (muon), D. Schulte (muon), M.
Klein (ERL
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