2024 Hollow cathode plasma contactors

Hollow cathode plasma contactors

Author: btmi

August undefined, 2024

NettetThe plasma contactor system is required to perform for two years on-orbit for a total cathode operation time of 17,500 hours. To meet these requirements, a reliable, long-life electron emitter for the plasma contactor is needed. A hollow cathode-based configuration was selected as the electron emitter due to its successful application http://electricrocket.org/IEPC/271_1.pdf

Ion Emission From a Positively Biased Hollow Cathode Plasma

NettetA test series of hollow cathodes and hollow cathode plasma contactors was initiated as part of the plasma contactor development program. An on-going wear-test of a … beurer kuumemittari

Hollow cathodes as electron emitting plasma contactors Theory …

http://electricrocket.org/IEPC/270_1.pdf Nettet17. jun. 2008 · Hollow cathodes are used for a wide variety of applications, including challenging ones like plasma contactors for sounding rocket experiments. Existing hollow Hollow cathode conditioning and discharge initiation studies IEEE Conference Publication IEEE Xplore Skip to Main Content Hollow cathode conditioning and … Nettet1. nov. 1997 · The International Space Station Plasma Contactor System requires a hollow cathode assembly (HCA) with a lifetime of at least 18,000 hours. Critical … beurer jalkakylpy

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NettetOperational status of the International Space Station plasma contactor hollow cathode assemblies from July 2011 to May 2013 / by: Kamhawi, Hani, Published: (2014) SRM propellant, friction/ESD testing / by: Campbell, LaVere A. Published: (1989) Electric vehicle charging stations as a climate change ... NettetThe hollow cathode is a DC plasma source in the hall thrusters and ion thruster, while it also can be exploited as the plasma contactor in the electrodynamic tether (EDT for … beurer kirkasvalolamppu tl30NettetSME in spacecraft charging, plasma devices, cutting edge space technologies, ... Experiments using hollow cathode contactors are ongoing to validate this physical interpretation, ... beurer kynsienhoitosarja

"Nettet1. jul. 2016 · [18] Williams John D and Wilbur Paul J 1989 Ground-based tests of hollow cathode plasma contactors AIAA 89-40188. Google Scholar [19] Wilbur Paul J and Williams John D 1987 An experimental investigation of the plasma contacting process AIAA-87-0571. Google Scholar " - Hollow cathode plasma contactors

Hollow cathode plasma contactors

Continuing Life Test of a Xenon Hollow Cat~ode for a Space Plasma Contactor

Nettet31. jul. 2024 · As a plasma source, by spraying plasma to the space environment, a hollow cathode plasma contactor (HCPC) can establish a current loop with the space plasma. To date, HCPC has been used in the fields of spacecraft surface potential active control [ 1 – 8] and electrodynamic tether technology [ 9 – 14 ]. Nettet1. nov. 2024 · A hollow-cathode contactor is an ideal plasma contactor. A principle diagram for the application of a hollow-cathode contactor to active surface potential …

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NettetSince October 2000, two plasma contactors have been providing charge control on the International Space Station (ISS). At the heart of each of the two plasma contactors is a hollow cathode assembly (HCA) that produces the contacting xenon plasma. The HCA is the result of 9 years of design and testing at the NASA Glenn Research Center. This … NettetSpace Station plasma contactors [2] use hollow cathodes to emit electron current, as demanded, to the ambient space plasma at low coupling voltages, thus compensating for spacecraft charging. For all of these applications, long cathode lifetime is critically important. The entitlement, or theoretical maximum, lifetime of

Nettet23. mai 2012 · American Institute of Aeronautics and Astronautics 12700 Sunrise Valley Drive, Suite 200 Reston, VA 20241-5807 703.264.7500 NettetSince October 2000, two plasma contactors have been providing charge control on the International Space Station (ISS). At the heart of each of the two plasma contactors is a hollow cathode assembly (HCA) that produces the contacting xenon pla .. ma. The HCA is the result of 9 years of design and testing at the NASA Glenn Research Center.

NettetA hollow cathode-based plasma contactor has been selected for use on the Space Station. During the operation of the plasma contactor, the hollow cathode heater will … NettetⅡ. MODELING OF INSERT PLASMA Fig. 1 show a schematic of a BaO-W hollow cathode emitter region. In this model, we assume that the insert plasma obey the quasi-neutrality (nn n ec

NettetInternational Space Station Plasma Contactor Unit since 1999 (Ref. 4). While these heaters were subse-quently used on flight missions of electrostatic ion thrusters, Heater configurations were evolved to support the larger discharge hollow cathode for NEXT ion thruster , where the cyclic capab ility was further demonstrated (Ref. 5).

Nettet3. jan. 2024 · Since the hollow cathode is the core part of a plasma contactor, it can be speculated that the plasma contactor will also be subject to instability during the … beurer kirkasvalolamppu tl70NettetCSU is currently focusing on the modeling, simulation, and testing of a Hollow Cathode Plasma Contactor (HCPC) system for EDTs. The plasma contactor (PC) is important to the operation of an EDT because it is used to close the electrical circuit between the EDT and the ionospheric plasma. The details of a PC are discussed in Section 1.5.5. beurer kuulolaiteNettetThe hollow cathode of the plasma contactor is a refractory metal tube, through which xenon gas flows, which has a disk-shaped plate with a centered orifice at the downstream end of the tube. Within the cathode, arc attachment occurs primarily on a Type S low work function insert that is next to the orifice plate. beurer vaaka ei toimiNettetUsed in Mission-critical Space Applications Built using the same quality systems that are used for space-qualified microwave cathodes, 3M™ Hollow Cathodes (PDF, 135.48 Kb) are used in mission-critical space applications including ion sources, electric propulsion, plasma contactors and spacecraft neutralization. Precision Through Process beurer sähköinen kynsiviilaNettetComparison of on-orbit and ground based hollow cathode operation / Published: (2003) International Space Station cathode life testing status / by: Sarver-Verhey, Timothy R.,, et al. Published: (1998) Space station cathode ignition test status at 32,000 cycles / beurer kuumemittari käyttöohjeNettetHollow Cathode Plasma Contactor Research Hollow Cathode Plasma Contactor Research at the Plasma Engineering Research Lab Theory suggests that electrical … beurer kirkasvalolamppu tl45Nettet12. aug. 2014 · The formation of electron emission-bias voltage ( I-V) characteristics of near-zero differential resistance in the cathodic plasma contactor for bare electrodynamic tether applications, based on a hollow cathode embedded in a … beurer vuoteenlämmitin