comunicación de congreso
Discharge formation in fast pulsed capillary discharges
Fecha
2002Registro en:
10.1063/1.1531323
978-0735401075
Autor
Favre Domínguez, Mario
Choi, Peter
Leñero Marchant, Ana María
Castillo, Francisco
Suzuki Vidal, Francisco Andrés
Chuaqui Kettlun, Hernán
Mitchell, Ian H.
Wyndham Hodder, Edmund Sydenham
Institución
Resumen
We present a study of discharge formation in a fast pulsed capillary discharge operated in Argon or Methane, in a 50 mm long, 1.6 mm internal diameter capillary, at −15 kV applied voltage. A pressure gradient is used along the capillary, with pressures between 0.2 and 1.0 Torr in the cathode region and a pressure one tenth lower in the anode side. The diagnostics include a capacitive probe array, Faraday cup and beam-target scintillator-photomultiplier detectors. It is found that following the emission of electron beams from the hollow cathode region, a fast ionization wave propagates from the cathode towards the anode, with characteristic velocities of the order of 106 to 107 m/s. The propagation of the ionization front is assisted by the electron beams, which reach a peak current of around 200 mA.