On the performances of a new thresholding procedure using tree structure

This paper deals with the problem of function estimation. Using the white noise model setting, we provide a method to construct a new wavelet procedure based on thresholding rules which takes advantage of the dyadic structure of the wavelet decomposition. We prove that this new procedure performs very well since, on the one hand, it is adaptive and near-minimax over a large class of Besov spaces and, on the other hand, the maximal functional space (maxiset) where this procedure attains a given rate of convergence is very large. More than this, by studying the shape of its maxiset, we prove that the new procedure outperforms the hard thresholding procedure.Comment: Published in at http://dx.doi.org/10.1214/08-EJS205 the Electronic Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of Mathematical Statistics (http://www.imstat.org

Neutrino Factory Designs and R&D

European, Japanese, and US Neutrino Factory designs are presented. The main R&D issues, and the associated R&D programs, are discussed.Comment: Talk presented at the XXth International Conference on Neutrino Physics and Astrophysics, May 25-30, 2002, Munich, Germany. 10 pages, 12 figure

Thresholding methods to estimate the copula density

This paper deals with the problem of the multivariate copula density estimation. Using wavelet methods we provide two shrinkage procedures based on thresholding rules for which the knowledge of the regularity of the copula density to be estimated is not necessary. These methods, said to be adaptive, are proved to perform very well when adopting the minimax and the maxiset approaches. Moreover we show that these procedures can be discriminated in the maxiset sense. We produce an estimation algorithm whose qualities are evaluated thanks some simulation. Last, we propose a real life application for financial data

Low-Energy Proton Driver for a Neutrino Factory

In contrast with other designs where the proton driver of a muon collider of of a neutrino factory is a synchrotron of energy up to 50 GeV, it is shown that a low-energy and high-power system inspired by neutron spallation sources can meet the requirements of a neutrino factory. Such a system consists of a 2 GeV linac, a fixed field accumulator that produces an adequate time structure and a compressor that reduces the bunch length to the final value of a few nanoseconds

Doublet final focus

A doublet scheme is designed in a self consistent analytical way for the low b insertion of a m+-m- collider. It assumes focusing strengths of same magnitude and opposite signs in the quadrupoles. At the matching point, the b values are equal and the a values opposite. Two solutions using superconducting or permanent quadrupoles are discussed