66,281 research outputs found
Rotating Band Pion Production Targets for Muon Colliders and Neutrino Factories
An update is presented on a conceptual design for a pion production target
station using a rotating cupronickel band and that was originally proposed for
use at a muon collider facility with a 4 MW pulsed proton beam. After reviewing
the salient design features and motivations for this target, ongoing studies
are described that are attempting to benchmark the thermal stresses and
radiation damage on the target band using data from the Fermilab antiproton
source and other operating targets. Possible parameter optimizations and
alternative technologies for the rotating band are surveyed, including
discussion on the the various proton beam parameters that might be encountered
for rotating band targets at either muon colliders or neutrino factories.
Finally, an outline is proposed for a possible R&D path towards capability for
the actual construction of rotating band pion production targets.Comment: 14 pages, 4 figures. Submitted to Proc. ICFA/ECFA Workshop on
Neutrino Factories Based on Neutrino Storage Rings (NuFACT'99), Lyon, France,
5-9 July, 199
Parameter Sets for 10 TeV and 100 TeV Muon Colliders, and their Study at the HEMC'99 Workshop
A focal point for the HEMC'99 workshop was the evaluation of straw-man
parameter sets for the acceleration and collider rings of muon colliders at
center of mass energies of 10 TeV and 100 TeV. These self-consistent parameter
sets are presented and discussed. The methods and assumptions used in their
generation are described and motivations are given for the specific choices of
parameter values. The assessment of the parameter sets during the workshop is
then reviewed and the implications for the feasibility of many-TeV muon
colliders are evaluated. Finally, a preview is given of plans for iterating on
the parameter sets and, more generally, for future feasibility studies on
many-TeV muon colliders.Comment: 20 pages, 2 figures. Submitted to Proc. HEMC'99 Workshop - Studies on
Colliders and Collider Physics at the Highest Energies: Muon Colliders at 10
TeV to 100 TeV; Montauk, NY, September 27-October 1, 199
No Intersexual Differences in Host Size and Species Usage in \u3ci\u3eSpalangia Endius\u3c/i\u3e (Hymenoptera: Pteromalidae)
Spalangia endius were collected from fly pupae, primarily house fly and stable fly, from a poultry house in Indiana. Male and female wasps did not differ within and across host species in host size usage. Also, despite stable fly pupae being significantly smaller than house fly pupae, the proportion of male wasps emerging from the two host species was similar
Mighty MURINEs: Neutrino Physics at Very High Energy Muon Colliders
An overview is given of the potential for neutrino physics studies through
parasitic use of the intense high energy neutrino beams that would be produced
at future many-TeV muon colliders. Neutrino experiments clearly cannot compete
with the collider physics. Except at the very highest energy muon colliders,
the main thrust of the neutrino physics program would be to improve on the
measurements from preceding neutrino experiments at lower energy muon
colliders, particularly in the fields of B physics, quark mixing and CP
violation. Muon colliders at the 10 TeV energy scale might already produce of
order 10^8 B hadrons per year in a favorable and unique enough experimental
environment to have some analytical capabilities beyond any of the currently
operating or proposed B factories. The most important of the quark mixing
measurements at these energies might well be the improved measurements of the
important CKM matrix elements |V_ub| and |V_cb| and, possibly, the first
measurements of |V_td| in the process of flavor changing neutral current
interactions involving a top quark loop. Muon colliders at the highest
center-of-mass energies that have been conjectured, 100--1000 TeV, would
produce neutrino beams for neutrino-nucleon interaction experiments with
maximum center-of-mass energies from 300--1000 GeV. Such energies are
comparable to the 314 GeV center-of-mass energy for electron-proton scattering
at the HERA collider, but the luminosity would would be several orders of
magnitude larger. This would potentially open up the possibility for high
statistics studies of any exotic particles, such as leptoquarks, that might
have been previously discovered at these energy scales.Comment: 23 pages, 7 figures. Submitted to Proc. HEMC'99 Workshop - Studies on
Colliders and Collider Physics at the Highest Energies: Muon Colliders at 10
TeV to 100 TeV; Montauk, NY, September 27-October 1, 199
New method forms bond line free of voids
A new bonding method using vacuum, pressure and heat, which produces a bond line free of voids, is described. This method is very successful in bonding ablation shields to a magnesium structural component in simulated reentry tests involving great heat and air turbulence
Improved high volume air sampler
Sampler permits size separations of particles by directing sampled air through cross-sectional area sufficiently large that air velocity is reduced to point where particles or larger size will settle out. Sampler conducts air downward and through slots around periphery of unit into relatively open interior of house
Prospects for Colliders and Collider Physics to the 1 PeV Energy Scale
A review is given of the prospects for future colliders and collider physics
at the energy frontier. A proof-of-plausibility scenario is presented for
maximizing our progress in elementary particle physics by extending the energy
reach of hadron and lepton colliders as quickly and economically as might be
technically and financially feasible. The scenario comprises 5 colliders beyond
the LHC -- one each of e+e- and hadron colliders and three muon colliders --
and is able to hold to the historical rate of progress in the log-energy reach
of hadron and lepton colliders, reaching the 1 PeV constituent mass scale by
the early 2040's. The technical and fiscal requirements for the feasibility of
the scenario are assessed and relevant long-term R&D projects are identified.
Considerations of both cost and logistics seem to strongly favor housing most
or all of the colliders in the scenario in a new world high energy physics
laboratoryComment: 36 pages, 4 figures. Submitted to Proc. HEMC'99 Workshop - Studies on
Colliders and Collider Physics at the Highest Energies: Muon Colliders at 10
TeV to 100 TeV; Montauk, NY, September 27-October 1, 199
Neutrino Radiation Challenges and Proposed Solutions for Many-TeV Muon Colliders
Neutrino radiation is expected to impose major design and siting constraints
on many-TeV muon colliders. Previous predictions for radiation doses at TeV
energy scales are briefly reviewed and then modified for extension to the
many-TeV energy regime. The energy-cubed dependence of lower energy colliders
is found to soften to an increase of slightly less than quadratic when averaged
over the plane of the collider ring and slightly less than linear for the
radiation hot spots downstream from straight sections in the collider ring.
Despite this, the numerical values are judged to be sufficiently high that any
many-TeV muon colliders will likely be constructed on large isolated sites
specifically chosen to minimize or eliminate human exposure to the neutrino
radiation. It is pointed out that such sites would be of an appropriate size
scale to also house future proton-proton and electron-positron colliders at the
high energy frontier, which naturally leads to conjecture on the possibilities
for a new world laboratory for high energy physics. Radiation dose predictions
are also presented for the speculative possibility of linear muon colliders.
These have greatly reduced radiation constraints relative to circular muon
colliders because radiation is only emitted in two pencil beams directed along
the axes of the opposing linacs.Comment: 16 pages, 8 figures. Submitted to Proc. HEMC'99 Workshop - Studies on
Colliders and Collider Physics at the Highest Energies: Muon Colliders at 10
TeV to 100 TeV; Montauk, NY, September 27-October 1, 199
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