200 research outputs found
A local limit theorem for triple connections in subcritical Bernoulli percolation
We prove a local limit theorem for the probability of a site to be connected
by disjoint paths to three points in subcritical Bernoulli percolation on
in the limit where their distances tend to infinity.Comment: 31 page
FCC-ee: Energy calibration
The FCC-ee aims to improve on electroweak precision measurements, with goals
of 100 keV on the Z mass and width, and a fraction of MeV on the W mass.
Compared to LEP, this implies a much improved knowledge of the centre-of-mass
energy when operating at the Z peak and WW threshold. This can be achieved by
making systematic use of resonant depolarization. A number of issues have been
identified, due in particular to the long polarization times. However the
smaller emittance and energy spread of FCC-ee with respect to LEP should help
achieve a much improved performance.Comment: Poster presented at IPAC'15, Richmond, VA, USA, May 2015. arXiv admin
note: substantial text overlap with arXiv:1501.0685
Stress–strain relationships and yielding of metal-organic framework monoliths
Metal-organic frameworks (MOFs) have emerged as a versatile material platform for a wide range of applications. However, the development of practical devices is constrained by their inherently low mechanical stability. The synthesis of MOFs in a monolithic morphology represents a viable way for the transition of these materials from laboratory research to real-world applications. For the design of MOF-based devices, the mechanical characterization of such materials cannot be overlooked. In this regard, stress-strain relationships represent the most valuable tool for assessing the mechanical response of materials. Here, we use flat punch nanoindentation, micropillar compression and Raman microspectroscopy to investigate the stress-strain behaviour of MOF monoliths. A pseudo-plastic flow is observed under indentation, where the confining pressure prevents unstable crack propagation. Material flow is accommodated by grain boundary sliding, with occasional stepwise cracking to accommodate excessive stress building up. Micropillar compression reveals a brittle failure of ZIF-8, while plastic flow is observed for MIL-68
High Resolution BPM Upgrade for the ATF Damping Ring at KEK
A beam position monitor (BPM) upgrade at the KEK Accelerator Test Facility
(ATF) damping ring has been accomplished, carried out by a KEK/FNAL/SLAC
collaboration under the umbrella of the global ILC R&D effort. The upgrade
consists of a high resolution, high reproducibility read-out system, based on
analog and processing, and also implements a new automatic gain error
correction schema. The technical concept and realization as well as results of
beam studies are presented.Comment: 3 pp. 10th European Workshop on Beam Diagnostics and Instrumentation
for Particle Accelerators DIPAC 2011, 16-18 May 2011. Hamburg, German
LHC Abort Gap Cleaning with the Transverse Damper
In the Large Hadron Collider, LHC, particles not captured by the RF system at injection or leaking out of the RF bucket may quench the superconducting magnets during beam abort. The problem, common to other superconducting machines, is particularly serious for the LHC due to the very large stored energy in the beam. For the LHC a way of removing the unbunched beam has been studied and it uses the existing damper kickers to excite resonantly the particles travelling along the abort gap. In this paper we describe the results of simulations performed with MAD X for various LHC optics configurations, including the estimated multipolar errors
On the Ornstein-Zernike behaviour for the Bernoulli bond percolation on in the supercitical regime
We prove Ornstein-Zernike behaviour in every direction for finite connection
functions of bond percolation on for when the
probability of occupation of a bond, is sufficiently close to Moreover, we
prove that equi-decay surfaces are locally analytic, strictly convex, with
positive Gaussian curvature.Comment: 18 pages, published versio
Synchrotron nano-FTIR spectroscopy for probing anticancer drugs at subcellular scale
The cellular response to cisplatin was assessed in human osteosarcoma cells, using synchrotron-based (SR) Fourier Transform InfraRed nanospectroscopy (nano-FTIR) at the MIRIAM beamline B22 of Diamond Light Source (UK). This label-free mapping method delivered simultaneous morphological and biochemical information on a subcellular level (i.e. 100 s nanometer or better). Based on specific spectral biomarkers, the main biochemical constituents affected by the drug were identified at distinct locations within the cell´s inner body. Cisplatin was shown to have a noteworthy effect on proteins, mostly within the cytoplasm. A clear drug impact on cellular lipids was also observed. Within current literature on s-SNOM, this nanospectroscopy work represents a first successful application in life sciences providing full fingerprint nano-FTIR spectra across intact human cancer cells
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Machine studies during beam commissioning of the SPS-to-LHC transfer lines
Through May to September 2008, further beam commissioning of the SPS-to-LHC transfer lines was performed. For the first time, optics and dispersion measurements were also taken in the last part of the lines, and into the LHC. Extensive trajectory and optics studies were conducted, in parallel with hardware checks. In particular dispersion measurements and their comparison with the beam line model were analysed in detail and led to propose the addition of a dispersion-free steering algorithm in the existing trajectory correction program. Its effectiveness was simulated and is briefly discussed
Progress with the Upgrade of the SPS for the HL-LHC Era
The demanding beam performance requirements of the High Luminosity (HL-) LHC
project translate into a set of requirements and upgrade paths for the LHC
injector complex. In this paper the performance requirements for the SPS and
the known limitations are reviewed in the light of the 2012 operational
experience. The various SPS upgrades in progress and still under consideration
are described, in addition to the machine studies and simulations performed in
2012. The expected machine performance reach is estimated on the basis of the
present knowledge, and the remaining decisions that still need to be made
concerning upgrade options are detailed.Comment: 3 p. Presented at 4th International Particle Accelerator Conference
(IPAC 2013
Upgrades Of the SPS, Transfer Line and LHC Injection Protection Devices For the HL-LHC Era
The challenging High Luminosity LHC (HL-LHC) beam requirements will lead in
the future to unprecedented beam parameters along the LHC injector chain. In
the SPS accelerator these requests translate into about a factor two higher
intensity and brightness than the present design performance. In addition to
the challenge of producing and accelerating such beams, these parameters affect
the resistance of the existing equipment against beam impact. Most of the
protection devices in the SPS ring, its transfer lines and the LHC injection
areas will be put under operational constraints which are beyond their design
specification. The equipment concerned has been reviewed and their resistance
to the HL-LHC beams checked. Theoretical and simulation studies have been
performed for the SPS beam scraping system, the protection devices and the dump
absorbers of the SPS-to-LHC transfer lines, as well as for the LHC injection
protection devices. The first results of these studies are reported, together
with the future prospects.Comment: 3 p. Presented at 4th International Particle Accelerator Conference
(IPAC 2013
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