The ELENA facility

Abstract

The CERN Antiproton Decelerator (AD) provides antiproton beams with a kinetic energy of 5.3 MeV to an active user community. The experiments would profit from a lower beam energy, but this extraction energy is the lowest one possible under good conditions with the given circumference of the AD. The Extra Low Energy Antiproton ring (ELENA) is a small synchrotron with a circumference a factor of 6 smaller than the AD to further decelerate antiprotons from the AD from 5.3 MeV to 100 keV. Controlled deceleration in a synchrotron equipped with an electron cooler to reduce emittances in all three planes will allow the existing AD experiments to increase substantially their antiproton capture efficiencies and render new experiments possible. ELENA ring commissioning is taking place at present and first beams to a new experiment installed in a new experimental area are foreseen in 2017. The transfer lines from ELENA to existing experiments in the old experimental area will be installed during CERN Long Shutdown 2 (LS2) in 2019 and 2020. The status of the project and ring commissioning will be reported.This article is part of the Theo Murphy meeting issue 'Antiproton physics in the ELENA era'.

Positron production using a 9 MeV electron linac for the GBAR experiment

“…The experiment will receive antiprotons at 100 keV kinetic energy from the new ELENA ring of the AD facility at CERN [21], which are then further slowed down to a few keV energy by an electrostatic decelerator. The expected intensity is 4 × 10 6 antiprotons per pulse.…”

Superconducting Solenoid System with Adjustable Shielding Factor for Precision Measurements of the Properties of the Antiproton

“…per 120 s deceleration cycle are observed along the horizontal trap axis. The ELENA decelerator [24], with its closest magnet located approximately 5 m from the BASE experiment, also adds 30-90 nT peak-topeak fluctuations with a period of 10-90 s. Unshielded, these fluctuating fields add unacceptable noise, corresponding to peak-to-peak fluctuations in the instantaneous cyclotron frequency (29.…”

A pulsed high-voltage decelerator system to deliver low-energy antiprotons

“…TheH + ions for GBAR will be fabricated using antiprotons delivered by the CERN AD-ELENA facility [15]. The ELENA synchrotron heralds a new era of antiproton and antimatter physics.…”