Charged particle source based on poro-electron emission

Poro-electron emission based cold cathodes have a number of advantages: low values of electrical field strength; low requirements on vacuum; possibility of emergency admission of atmosphere; and low expenditure for production of cathodes of large area and complex configuration. The results presented show that to irradiate objects of large areas, one can apply a poro electron emission based cold cathode. The irradiation can take place both in vacuum and in atmosphere. In the latter case, the electron beam is extracted into the atmosphere via an anode made of thin foil