Abstract
One of the main sources of electrons in the Spallation Neutron Source's Accumulator Ring is the stripped electrons in the injection region. A magnetic field guides the stripped electrons to the bottom of the beam pipe, where an electron catcher with overhanging surface traps them. This paper describes the stripped electrons' motion, the optimization of the catcher, and the build up of an electron cloud in this region.
Highlights
Electron-cloud instability is a major concern in the Spallation Neutron Source’s (SNS’s) Accumulator Ring
The electrons are stripped from an injected Hÿ beam generated by the Linac when Hÿ beam hits a carbon foil located in the gap of a dipole magnet
The stripped electrons are guided by the magnetic field and collected by a water-cooled device of heat-resistant material, the electron catcher that is located at the bottom of the chamber
Summary
Electron-cloud instability is a major concern in the Spallation Neutron Source’s (SNS’s) Accumulator Ring. This paper discusses studies of the electrons generated at the stripping foil in the injection region of the SNS ring. The electrons are stripped from an injected Hÿ beam generated by the Linac when Hÿ beam hits a carbon foil located in the gap of a dipole magnet. The stripped electrons are guided by the magnetic field and collected by a water-cooled device of heat-resistant material, the electron catcher that is located at the bottom of the chamber. When the stripped electrons hit the electron catcher, scattered electrons and secondaries are reflected outwards and may reenter the vacuum chamber. They interact with the circulating beam and again hit the foil. We described our strategy of designing the catcher elsewhere [2]
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