Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Poster (a)

HK 51.27: Poster

Thursday, April 2, 2020, 16:30–18:30, Zelt

Cold Field Emission Electron Source for the PUMA Ion Trap — •Jonas Fischer and Noritsugu Nakatsuka for the PUMA collaboration — TU Darmstadt, Darmstadt, Germany

The goal of the PUMA (antiProton Unstable Matter Annihilation) experiment is to investigate the neuron and proton density distribution in short-lived nuclei. This is to be achieved by the annihilation of antiprotons with the outermost nucleons of the nucleus. To make these measurements possible, one has to transport antiprotons to a radioactive ion beam facility. PUMA will first collect antiprotons at the AD (Antiproton Decelerator) and then transport them to the radioactive ion beam facility ISOLDE at CERN. For the storage of the antiprotons and the collision with the nuclei a cryogenic Penning trap is being designed and built. Approximately one billion antiprotons will be stored in the trap, but since their energy will be to high to keep them in the trap for a sufficiently long time, they will be cooled by means of sympathetic cooling using electrons. To create a sufficient amount of electrons without introducing an additional heat load, a cryogenic field emission electron source will be incorporated into the trap system. In this contribution the design and test of such an electron source will be presented. This contribution is supported by ERC-COG through grand no. 726276.