bstract Clouds of low energy electrons in the vacuum beam pipes of accelerators of positively charged particle beams present a serious limitation for operation of these machines at high currents. Because of the size of these accelerators, it is difficult to probe the low energy electron clouds over substantial lengths of the beam pipe. We have developed a novel technique to directly measure the...

Electron clouds pose a significant problem for high-energy lepton colliders, including the proposed International Linear Collider. The Cornell Electron Storage Ring Test Accelerator is able to study the dynamics of such clouds by measuring their effect on the tune of particle bunch trains. Key parameter values characterizing electron clouds can be estimated using numerical simulations of the ob...

Abstract The electron lens in the Fermilab Integrable Optics Test Accelerator (IOTA) will enable new research nonlinear integrable optics, space-charge compensation, cooling, and stability of intense beams. This addresses scientific questions on high-brightness beams operational challenges high-power accelerators for nuclear particle physics. We review roles that lenses play this field physical...

Introduction Particle accelerators have been essential tools for elementary particle physics research for many years. They are now becoming increasingly important for applied science, typically done at user facilities such as light sources and neutron sources. The performance of future high intensity positron and proton accelerators is likely to be limited by the development of electron plasma,...

An intense electromagnetic pulse can create a weak of plasma oscillations through the action of the nonlinear ponderomotive force. Electrons trapped in the wake can be accelerated to high energy. Existing glass lasers of power density lotsW/cm shone on plasmas of densities 10 8 cm can yield gigaelectronvolts of electron energy per centimeter of acceleration distance. This acceleration mechanism...

The cross section for exclusive $\mathrm{\ensuremath{\Upsilon}}$ ultraperipheral photoproduction at present and future colliders is determined using the low $x$ gluon parton distribution function extracted from an analysis of $J/\ensuremath{\psi}$ measurements performed Hadron-Electron Ring Accelerator Large Hadron Collider. Predictions are given next-to-leading order in collinear factorization...

A. Rossi, CERN, Geneva, Switzerland Abstract The LHC room temperature sections will be coated with non-evaporable getter (NEG) materials for, among other reasons, their properties of antimultipactor. Laboratory measurements of secondary electron yields (SEY) of TiZrV NEG coatings have shown that after 2 h heat treatment at 160 and 200 C, the maximum SEY decreases from 2 to below 1.4 and 1.1 res...

The term beta-beam has been coined for the production of a pure beam of electron neutrinos or their antiparticles through the decay of radioactive ions circulating in a storage ring. This concept requires radioactive ions to be accelerated to a Lorentz gamma of 150 for He and 60 for Ne. The neutrino source itself consists of a storage ring for this energy range, with long straight sections in l...