Optics for the Antiproton Decelerator at CERN

Abstract

The former Antiproton Collector (AC) at CERN has been transformed into an Antiproton Decelerator (AD) to supply high quality antiproton beams with a momentum of 100 MeV/c (kinetic energy of 5.3 MeV) [1]. As in AC, antiprotons are injected at 3.57 GeV/c and cooled by stochastic cooling system. To facilitate the deceleration and to prepare a small emittance beam for the experiments, stochastic cooling at 2 GeV/c and electron cooling at 300 MeV/c and 100 MeV/c has been incorporated. The required optics modifications are described and the results of machine commissioning are discussed.

Commissioning and first operation of the Antiproton Decelerator (AD)

“…It consists of just one ring, the former 3.5 GeV/c Antiproton Collector (AC), which has been modified to include deceleration down to 0.1 GeV/c [3]. The beam from the production target is injected, rfdebunched ('bunch rotation'), and stochastically cooled at 3.5 GeV/c (Fig.…”