11,545 research outputs found
Design and operation of a prototype interaction point beam collision feedback system for the International Linear Collider
A high-resolution, intratrain position feedback system has been developed to
achieve and maintain collisions at the proposed future electron-positron
International Linear Collider (ILC). A prototype has been commissioned and
tested with a beam in the extraction line of the Accelerator Test Facility at
the High Energy Accelerator Research Organization in Japan. It consists of a
stripline beam position monitor (BPM) with analogue signal-processing
electronics, a custom digital board to perform the feedback calculation, and a
stripline kicker driven by a high-current amplifier. The closed-loop feedback
latency is 148 ns. For a three-bunch train with 154 ns bunch spacing, the
feedback system has been used to stabilize the third bunch to 450 nm. The
kicker response is linear, and the feedback performance is maintained, over a
correction range of over 60 {\mu}m. The propagation of the correction has
been confirmed by using an independent stripline BPM located downstream of the
feedback system. The system has been demonstrated to meet the BPM resolution,
beam kick, and latency requirements for the ILC
Status of the Super-B factory Design
The SuperB international team continues to optimize the design of an
electron-positron collider, which will allow the enhanced study of the origins
of flavor physics. The project combines the best features of a linear collider
(high single-collision luminosity) and a storage-ring collider (high repetition
rate), bringing together all accelerator physics aspects to make a very high
luminosity of 10 cm sec. This asymmetric-energy collider
with a polarized electron beam will produce hundreds of millions of B-mesons at
the (4S) resonance. The present design is based on extremely low
emittance beams colliding at a large Piwinski angle to allow very low
without the need for ultra short bunches. Use of crab-waist
sextupoles will enhance the luminosity, suppressing dangerous resonances and
allowing for a higher beam-beam parameter. The project has flexible beam
parameters, improved dynamic aperture, and spin-rotators in the Low Energy Ring
for longitudinal polarization of the electron beam at the Interaction Point.
Optimized for best colliding-beam performance, the facility may also provide
high-brightness photon beams for synchrotron radiation applications
Design and prototype of a train-to-wayside communication architecture
Telecommunication has become very important in modern society and seems to be almost omnipresent, making daily life easier, more pleasant and connecting people everywhere. It does not only connect people, but also machines, enhancing the efficiency of automated tasks and monitoring automated processes. In this context the IBBT (Interdisciplinary Institute for BroadBand Technology) project TRACK (TRain Applications over an advanced Communication networK), sets the definition and prototyping of an end-to-end train-to-wayside communication architecture as one of the main research goals. The architecture provides networking capabilities for train monitoring, personnel applications and passenger Internet services. In the context of the project a prototype framework was developed to give a complete functioning demonstrator. Every aspect: tunneling and mobility, performance enhancements, and priority and quality of service were taken into consideration. In contrast to other research in this area, which has given mostly high-level overviews, TRACK resulted in a detailed architecture with all different elements present
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Design And Fabrication Of A Surface-Wave Accelerator Based On Silicon Carbide
The principles and electromagnetic simulations of a novel accelerating structure are described. The structure is planar, consisting of two plates of silicon carbide (SiC) separated by a vacuum gap. Charged particle bunches are accelerated in the vacuum gap by the surface electromagnetic waves (phonon polaritons) localized near the vacuum/SiC interface. The structure can be powered by a carbon dioxide (CO2) laser with the wavelength lambda(0) approximate to 10.6mum. The operating wavelength is dictated by the frequency-dependent dielectric permittivity epsilon(omega) of SiC which is negative for the frequencies in the CO2 tunability range. The resulting accelerator can support accelerating fields well in excess of 1 GeV/m without breakdown, and provide the path to compact and inexpensive particle accelerators. The challenge of coupling radiation into a very narrow (a few microns) vacuum gap is resolved by designing a coupling grating on the top surface of a Si wafer, and attaching a thin SiC film to the bottom of the wafer. Preliminary fabrication results are reported.Physic
The Large Hadron Electron Collider
An overview is given on key physics, detector and accelerator aspects of the
LHeC, including its further development, with emphasis to its role as the
cleanest microscope of parton dynamics and a precision Higgs facility.Comment: 13 pages, 4 figure
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