Speaker
Description
The Extremely Low ENergy Antiproton (ELENA) is a compact ring that was recently installed to complement the antimatter factory at CERN. A local H-/p source has been installed in ELENA for commissioning purposes of the ring and subsequent electrostatic transfer lines toward experiments, allowing to progress with the commissioning phase also in the absence of antiprotons. The ELENA source can produce pulses of H-, with a length of a few us and an intensity of approximately 50 uA at 100 keV, to mimic the antiproton pulse at extraction energy. In addition, the source can deliver proton pulses, if need be.
After a few years of operation, several observations have been collected that will be presented in this work. Of particular interest is the observation of a fast (about 1 MHz) intra-pulse instability for H-, which resulted in poor charge stability of the H- beam injected into ELENA. Possible ways of stabilising the beam pulse have been found and will also be presented.
