| 摘要 |
<p>The invention concerns an electronic optical device for generating an electron beam (6) comprising a cold cathode (9) extending in a main direction (Ox), an anode (10) arranged substantially facing the cold cathode (9), a substrate (17) extending the cold cathode (9) in the main direction (Ox) and a magnetic circuit (14), means (11) for generating a difference in electric potentials between the anode (10) and the cold cathode (9) are designed to generate a macroscopic electric field (Emacro) for extracting electrons from the cold cathode (9). The magnetic field generated by the magnetic circuit (14) is designed to redirect the electrons extracted from the cold cathode (9) towards the cold cathode (9), the electrons drifting in the main direction (Ox) until they exit a volume located between the cold cathode (9) and the anode (10), the magnetic field being perpendicular to the macroscopic electric field.</p> |
