Hollow Beam

The Tevatron Electron Lens #2 has been adapted for use as an electron beam collimator. Its functions include controlling and reducing the beam halo. The hollow electron beam collimator (HEBC) is a magnetically confined, optionally pulsed electron beam with a hollow current-density profile. The core of the antiprotons pass through the center of the electron distribution unperturbed. The halo experiences nonlinear transverse kicks and it is driven towards the electron collimators. The electron beam can be placed close to the antiproton beam core without any material damage.