5,629 research outputs found
Ultra-Low-Power Superconductor Logic
We have developed a new superconducting digital technology, Reciprocal
Quantum Logic, that uses AC power carried on a transmission line, which also
serves as a clock. Using simple experiments we have demonstrated zero static
power dissipation, thermally limited dynamic power dissipation, high clock
stability, high operating margins and low BER. These features indicate that the
technology is scalable to far more complex circuits at a significant level of
integration. On the system level, Reciprocal Quantum Logic combines the high
speed and low-power signal levels of Single-Flux- Quantum signals with the
design methodology of CMOS, including low static power dissipation, low latency
combinational logic, and efficient device count.Comment: 7 pages, 5 figure
Observations of beam-beam effects at the LHC
This paper introduces a list of observations related to the beam-beam
interaction that were collected over the first years of LHC proton physics
operation (2010-12). Beam-beam related effects not only have been extensively
observed and recorded, but have also shaped the operation of the LHC for
high-intensity proton running in a number of ways: the construction of the
filling scheme, the choice of luminosity levelling techniques, measures to
mitigate instabilities, and the choice of settings for improving performance
(e.g. to reduce losses), among others.Comment: Presented at the ICFA Mini-Workshop on Beam-Beam in Hadron Colliders,
CERN, Geneva, Switzerland, 18-22 March 201
Evaluation and demonstration of the use of cryogenic propellants /oxygen/hydrogen/ for reaction control systems. Volume 2 - Experimental evaluations and demonstration Final report
Evaluation and demonstration of cryogenic propellant /oxygen-hydrogen/ use for spacecraft reaction control system
Two articles employing risk programming techniques to determine optimal enterprise combinations on southern Iowa farms
Strichartz estimates for the Schr\"odinger equation on polygonal domains
We prove Strichartz estimates with a loss of derivatives for the
Schr\"odinger equation on polygonal domains with either Dirichlet or Neumann
homogeneous boundary conditions. Using a standard doubling procedure, estimates
the on polygon follow from those on Euclidean surfaces with conical
singularities. We develop a Littlewood-Paley squarefunction estimate with
respect to the spectrum of the Laplacian on these spaces. This allows us to
reduce matters to proving estimates at each frequency scale. The problem can be
localized in space provided the time intervals are sufficiently small.
Strichartz estimates then follow from a result of the second author regarding
the Schr\"odinger equation on the Euclidean cone.Comment: 12 page
Coherent beam-beam mode in the LHC
Observations of single bunch beam-beam coherent modes during dedicated
experiments in the LHC are presented. Their role in standard operation for
physics is discussed and, in particular, candidates of beam-beam coherent mode
driven unstable by the machine impedance are presented.Comment: 4 pages, contribution to the ICFA Mini-Workshop on Beam-Beam Effects
in Hadron Colliders, CERN, Geneva, Switzerland, 18-22 Mar 201
Long Range Beam-beam Effects in the LHC
We report on the experience with long-range beam--beam effects in the LHC, in
dedicated studies as well as the experience from operation. Where possible, we
compare the observations with the expectations.Comment: Presented at the ICFA Mini-Workshop on Beam-Beam in Hadron Colliders,
CERN, Geneva, Switzerland, 18-22 March 201
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