The characterization of a pulsed intense electron beam produced by dielectric cylindrical hollow cathode
- Universite Paris-Sud, Orsay (France)
- Magurele, Bucharest (Romania); and others
Intense electron beams were recently produced with dielectric or metallic cylindrical hollow cathodes without bore hole, but using various preionization sources. A characterization of such electron beams is presented. The discharge configuration and electrical circuit are similar to those described in excepting a metallic diaphragm (0.5 mm thick, 0.5 mm diameter) at floating potential which separates beam formation region (0.22 Torr Argon) from beam propagation region (0.15 Torr Argon). Measurements are performed behind an internal disk shaped anode. A Faraday cup made of graphite has been used to measure the current Ifar(t) carried by the electron beam. The energy spectrum of the beam was measured using a magnetic analyzer. The deflected electrons are selected by an off axis slit, and impinge on a NE 102A scintillator covered with a thin aluminum layer which prevents the light from the discharge to enter the scintillator and stops the electrons with energies less then about 4 keV. By using a fast photomultiplier and an optical fiber, which collects the light from the fluorescent spot produced by the electron beam, we obtain the temporal dependence of the electron beam intensity for the selected energy (scintillator signal). The analyser was calibrated by using a low intensity monoenergetic electron beam produced in a high voltage (d.c.) discharge.
- OSTI ID:
- 212826
- Report Number(s):
- CONF-950749-; TRN: 96:009994
- Resource Relation:
- Conference: 22. international conference on phenomena in ionized gases, Hoboken, NJ (United States), 31 Jul - 4 Aug 1995; Other Information: PBD: 1995; Related Information: Is Part Of XXII International conference on phenomena in ionized gases. Contributed papers 2; Becker, K.H.; Carr, W.E.; Kunhardt, E.E. [eds.]; PB: 226 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Micro-hollow cathode discharge arrays: high pressure, nonthermal plasma sources
Li+ alumino-silicate ion source development for the Neutralized Drift Compression Experiment (NDCX-II)