CERN ELENA project progress report

Wolfgang Bartmann,Tommy Eriksson,Sergio Pasinelli,C Carli,Walter Oelert,Stephan Maury,Gerard Tranquille,Pavel Belochitskii,François Butin,Horst Breuker,L Bravina,Y Foka,S Kabana

doi:10.1051/epjconf/20159504012

Abstract

The Extra Low Energy Antiproton ring (ELENA) is a CERN project aiming at constructing a 30 m circumference synchrotron to further decelerate antiprotons from the Antiproton Decelerator (AD) from 5.3 MeV to 100 keV. The additional deceleration complemented by an electron cooler to reduce emittances will allow the existing AD experiments to increase substantially their antiproton capture efficiencies and render new experiments possible. The ELENA design is now well advanced and the project has entered the construction stage, in particular for what concerns the infrastructure. Installation of the machine components is foreseen during the second half of 2015 and beginning of 2016 followed by ring commissioning until the end of 2016. New electrostatic transfer lines to the experiments will be installed and commissioned during the first half of 2017 followed by the first physics operation with AD/ELENA end of 2017. Main ELENA related infrastructure progresses as well as the status of the project are reported.

Highlights

The ELENA (Extra Low Energy Antiproton) project is a small size (30.4 m circumference) synchrotron with hexagonal shape, to be built at CERN
An electron gun will produce a cold (T4 < 0.1 eV, T// < 1 meV) and relatively intense electron beam (T4 is the temperature of the electron beam in the direction perpendicular to the beam axis, T// is the temperature in the direction parallel to the beam axis)
A crucial point of the design of the electron cooler is the quality of the longitudinal magnetic field guiding the electrons from the gun to the collector and in particular the quality of the magnetic field in the interaction region of the drift solenoid

Summary

Introduction

The ELENA (Extra Low Energy Antiproton) project is a small size (30.4 m circumference) synchrotron with hexagonal shape, to be built at CERN. By employing a ring equipped with beam cooling, an important increase in phase-space density and high experiment injection efficiency can be obtained, resulting in an increased number of trapped antiprotons. With the construction of the ELENA ring, the AD experiments expect efficiency improvements of up to two orders of magnitude in the number of usable antiprotons.

Results

Conclusion