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Electron Beam Suitable for Medium Energy Electron Cooling
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Electron cooling of charged particle beams is a§well-established technique at electron energies of up§to 300 keV. However, until recently the advance of§electron cooling to the MeV-range energies remained a§purely theoretical possibility. In 2005 the electron§cooling project at Fermilab demonstrated the first§cooling of 8.9 GeV/c antiprotons in the Recycler§ring, and therefore, has proved the validity of the§idea of relativistic electron cooling. The§performance of the Recycler Electron Cooler (REC) §depends critically on the quality of electron beam. A§stable electron beam of 4.3 MeV carrying 0.5 A of DC§current is required. The beam suitable for the REC§must have an angular spread not exceeding 200 urad.§The full-scale prototype of the REC was designed,§built and tested at Fermilab to study the feasibility§of attaining the high-quality electron beam. In this§work we describe various aspects of development of§the Fermilab electron cooling system, and the§techniques used to obtain the electron beam suitable§for the cooling process.
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