1,363 research outputs found
Non-interleaved FFS design
The requirements on the Final Focusing System (FFS) for a new linear collider
has lead to lattice designs where chromaticity is corrected either locally or
non-locally. Here, we present the status of an alternative lattice design
developed for the current CLIC 500GeV beam parameters where chromaticity is
corrected upstream the Final Doublet (FD) and the geometrical components in the
vertical plane are corrected locally. The diagnose of this design showed to
possible variations two the lattice : the second order dispersion and its
derivative with respect to must be cancelled before the FD, or some
dispersion must be tolerated at the sextupole located inside the FD.Comment: Talk presented at the International Workshop on Future Linear
Colliders (LCWS14), Belgrade, Serbia, 6-10 October 201
2D-Oide effect
The Oide effect considers the synchrotron radiation in the final focusing
quadrupole and it sets a lower limit on the vertical beam size at the
Interaction Point, particularly relevant for high energy linear colliders. The
theory of the Oide effect was derived considering only the radiation in the
focusing plane of the magnet. This article addresses the theoretical
calculation of the radiation effect on the beam size consider- ing both
focusing and defocusing planes of the quadrupole, refered to as 2D-Oide. The
CLIC 3 TeV final quadrupole (QD0) and beam parameters are used to compare the
theoretical results from the Oide effect and the 2D-Oide effect with particle
tracking in PLACET. The 2D-oide demonstrates to be important as it increases by
17% the contribution to the beam size. Further insight into the aberrations
induced by the synchrotron radiation opens the possibility to partially correct
the 2D-Oide effect with octupole mag
IntentsKB: A Knowledge Base of Entity-Oriented Search Intents
We address the problem of constructing a knowledge base of entity-oriented
search intents. Search intents are defined on the level of entity types, each
comprising of a high-level intent category (property, website, service, or
other), along with a cluster of query terms used to express that intent. These
machine-readable statements can be leveraged in various applications, e.g., for
generating entity cards or query recommendations. By structuring
service-oriented search intents, we take one step towards making entities
actionable. The main contribution of this paper is a pipeline of components we
develop to construct a knowledge base of entity intents. We evaluate
performance both component-wise and end-to-end, and demonstrate that our
approach is able to generate high-quality data.Comment: Proceedings of the 27th ACM International Conference on Information
and Knowledge Management (CIKM'18), 2018. 4 pages. 2 figure
CLIC 3 TeV Beam size Optimization with Radiation Effects
TUPWO003 - ISBN 978-3-95450-122-9International audienceHorizontal beamsize contribution due to radiation on bending magnets is calculated using theoretical results and recent improvements in mapclass (Mapclass2). In order to verify the code and validity of its approximations, a simple lattice with no geometrical nor chromatic aberrations, one dipole and a final drift has been used to compareMapclass2 calculations and Placet tracking results. CLIC 3TeV lattice is optimized including the radiation effects. Current results show that correction of chromatic aberrations impose constraints in radiation improvement
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