New generation electron-positron factories

A new positron accumulator with electron plasma

A new positron accumulation scheme with an electron plasma is presented. The electron plasma will be used as an energy absorber of positrons like a buffer gas. A unique feature of the scheme is an ability to accumulate a large number of positrons still keeping the whole system under ultra high vacuum (UHV) environment. The accumulation efficiency, which is defined as the ratio the number of the...

A New Injection System for an Electron/positron Linac

For the Linac II, which supplies the accelerator chain at DESY with electrons and positrons, a new injection system is planned. It is supposed to ensure reliable operation and to avoid the beam loss of about 60% before the positron converter and the associated activation. The main components are a 6 A/100 kV triode gun, buncher and a dispersive section for energy collimation. The output energy ...

ELECTRON - POSITRON ANNIHILATION ABOVE 2 GeV AND THE NEW PARTICIZS

New and Old Jet Clustering Algorithms for Electron-Positron Events

Over the years, many jet clustering algorithms have been proposed for the analysis of hadronic final states in ee annihilations. These have somewhat different emphasis and are therefore more or less suited for various applications. We here review some of the most used and compare them from a theoretical and experimental point of view.

Electron/Positron Identification

This electron/positron identification variable summary will check our understanding of these particles’ behavior in the isolated Radiative Bhabha environment versus the highdensity hadronic environment of the CLEO detector.