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

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

Optimum Optical Systems

The characteristics of complex optical systems required by modern accelerators and storage rings result from the optimization of many variable function, usually of c2-type. The search for the minimum of the function is very sensitive to the initial values of the variables. The route towards a safe determination of the initial conditions is described. First, fully analytical solutions for thin lens models are derived using symbolic computing. Then, for thick lens systems, the equations become transcendent and numerical techniques are applied. It is shown that, under rather general conditions, the optimization converges towards a single solution located in the neighbourhood of the thin lens approximation. The example of betatron matching with a doublet is described, as well as the case of an isochronous periodic structure

Large Acceptance Muon Storage Rings for Neutrino Production: Lattice Design

The possibility of achieving the high muon fluxes suggested in recent work on muon colliders has revived interest in the idea of using muon storage rings for neutrino production. Through proper design of the lattice, a significant fraction of the stored muons can be converted into an intense, low-divergence beam of neutrinos. This work examines the incorporation of a long, high-beta straight section for production of neutrino beams into a lattice which is otherwise optimized for transverse and longitudinal admittance. The ring must be able to accept a very large emittance and large momentum spread muon beam

Transverse collection of pions

The early stages of a neutrino factory are critical to fulfil physics requirements in the final muon storage ring. The transverse collection of pions behind the target is therefore a crucial feature for which different options exist. In this article, two collection systems using either quadrupoles or a transition solenoid between the target and the downstream channel are studied. The transition optics from the solenoid to a quadrupole channel is also discussed. Some figures of merit such as maximum transverse momentum captured or radial acceptance are compared as well as the technical challenges for each solution

Analysis of different options for a high intensity proton driver for neutrino factory

This note reports a number of different layouts for designing a high intensity proton driver. Such a machine should perform beam accumulation and bunch compression in order to achieve the performance needed for the production of neutrino in the context of a Neutrino Factory. The different approaches are described in details as well as the optics of the various lattices

Varying the Path Length of Charged Particles Using Wiggler Modules

In this paper, different versions of optical modules based on alternation of positive and neg-ative curvature magnets, called wigglers in analogy with the devices used in electron ma-chines, are presented. A careful analysis of their properties is carried out. For each module, a set of free parameters is given and the sign of the momentum compaction is discussed for various regions of the parameter space. Different types of wigglers are compared and one of them is applied to stretching an H- bunch in the transfer line from the Superconducting Proton Linac (SPL) and the accumulator ring for the CERN Neutrino Factory scenario