This paper presents the results of a series of electron emission tests carried out on thermionic neutralizers for a micronewton FEEP thruster. Several different sources have been tested in different experimental arrangements, including filaments and planar oxide cathodes. The filament performance was quite satisfactory, allowing the extraction of a 1 mA electron current with a 0.25 W power consumption. This is appropriate for a FEEP emitter of up to 100 uN thrust. The planar configuration presents more technological challenges. The prototype tested produced 3.3 mA at 720 °C, showing no sign of degradation after 20 hours continuous operation. Power consumption and reliability are still to be improved.
Experimental Performance of a Low Power Neutralizer for a Micronewton FEEP Thruster
MARCUCCIO, SALVO;ANDRENUCCI, MARIANO
1999-01-01
Abstract
This paper presents the results of a series of electron emission tests carried out on thermionic neutralizers for a micronewton FEEP thruster. Several different sources have been tested in different experimental arrangements, including filaments and planar oxide cathodes. The filament performance was quite satisfactory, allowing the extraction of a 1 mA electron current with a 0.25 W power consumption. This is appropriate for a FEEP emitter of up to 100 uN thrust. The planar configuration presents more technological challenges. The prototype tested produced 3.3 mA at 720 °C, showing no sign of degradation after 20 hours continuous operation. Power consumption and reliability are still to be improved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
