2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/14883Similar to the terrestrial collision accelerators of electron-antielectron, another kind of accelerator is above a positively or negatively charged pulsar polar cap. In the case of pulsars with magnetic axis parallel (anti-parallel) to rotational axis, relativistic antielectron (electron) with Lorentz factor about 10^6 hit the electrons in the polar caps. These scenarios are investigated both for pulsars being bare strange stars and for pulsars being neutron stars. Such a study may be valuable to differentiate neutron stars and bare strange stars observationally.2 pages, no figures, LaTeX, Contribution to IAU Colloquium 177: Pulsar Astronomy -- 2000 and BeyondAstrophysicstext