Emission, plasma formation, and brightness of a PZT ferroelectric cathode

Author

Sampayan, S. ; Caporaso, G. ; Trimble, D. ; Westenskow, G.

Author_Institution

Lawrence Livermore Nat. Lab., CA, USA

Volume

2

fYear

1995

fDate

1-5 May 1995

Firstpage

899

Abstract

We have measured a current emission density of 36 A-cm^-2 over an 11.4-cm²-area lead-titanate-zirconate (PZT) ferroelectric cathode with a pulsed anode-cathode (A-K) potential of 50 kV. We have also observed currents above those predicted by classical Child-Langmuir formula for a wide variety of cases. Since a plasma within the A-K gap could also lead to increase current emission we are attempting to measure the properties of the plasma near the cathode surface at emission time. In other measurements, we have observed strong gap currents in the absence of an A-K potential. Further, we continue to make brightness measurements of the emitted beam and observe spatially non-uniform emission and large shot-to-shot variation. Measurements show individual beamlets with a brightness as high 10¹¹ A m^-2 rad^-2

Keywords

brightness; cathodes; electron emission; ferroelectric devices; lead compounds; piezoceramics; solid-state plasma; 50 kV; PZT; PZT ferroelectric cathode; PbZrO3TiO3; beamlets; brightness; cathode surface; classical Child-Langmuir formula; current emission density; large shot-to-shot variation; plasma formation; pulsed anode-cathode potential; spatially nonuniform emission; strong gap currents; Brightness; Cathodes; Current measurement; Density measurement; Ferroelectric materials; Plasma density; Plasma measurements; Plasma properties; Pulse measurements; Time measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1995., Proceedings of the 1995

Conference_Location

Dallas, TX

Print_ISBN

0-7803-2934-1

Type

conf

DOI

10.1109/PAC.1995.505075

Filename

505075