document title / titre du document TRP W ORK PLAN ... - emits - ESA

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TRP Work Plan 2005-2007 Description of Activities TEC-SB/7935/dc 12/Feb/09 TRP Reference: Title: T601-17MP Development of a Circular Slit Field Emission Thruster Slit emitter field-emission electric propulsion systems have significantly improved their performances in terms of controllability and reliability over the last few decades. The desired higher emission levels would require a 25cm total slit. This considerable length can be achieved either with a cluster of several short linear emitters, or developing a single circular emitter with a radius of about 4cm. The circular configuration would present several advantages. First of all, it would eliminate emission wing effects; these perturbations were observed since the earlier works on field-emission, and counteracting measures were taken introducing field suppressors or complex compensating negative electrode geometries. A co-axial configuration would certainly enhance thrust homogeneity and help localizing the thrust vector. Besides, the assembly would be more compact, and the localization of the various subcomponents (heater, reservoir and feeding lines) could be optimised. Finally, the neutralizer could be ideally placed on the center axis of the oftware , thus providing optimal neutralization of the ion beam and reduced divergence angles. The purpose of the proposed activity is: Assess the technological complexity involved in the manufacturing and machining process of a 1um wide, 25cm long circular slit emitter; Design a complete circular slit 5mN FEEP assembly (including neutralizer); Manufacture a breadboard model; Perform a complete characterization test campaign. Deliverables: Technology assessment report. Design report for a 5mN circular slit FEEP model. Thruster breadboard model. Characterization test reports. Current TRL: TRL1 Target TRL: TRL2-3 Application Need/Date: TRL5 >2009-2010 Application/Mission: EO, Science, .. Contract Duration: 18 months SW Clause : - Dossier0 Ref.: T-1013 Consistency with Harmonisation Roadmap and Conclusions: TRP Reference: T601-31MP Title: Advanced Technologies Demonstrator for Very High-Power Hall-Effect Thrusters Future Hall-effect SW (HET) generations are technology limited: magnetic circuit, permanent magnets, high temperature materials, erosion resistant discharge channel, etc...Current high-power HET developments could simultaneously benefit from these new technologies in terms of mass, volume, lifetime, and performance. This activity will consist on: Phase I: Preliminary design of a 25 kW Hall-effect oftware (HET) using available scaling rules based on constant plasma density inside the acceleration channel. Functional analyses and performance simulations will be done to generate the expected performance envelop in discharge voltage and xenon mass-flow-rate. Based on the results of preliminary mechanical and thermal analyses it will be identified the technological improvements that would be required to manufacture and test a realistic 25 kW HET demonstrator while minimising mass, volume, and ceramic channel erosion. Phase II: Trading-off the various potential technologies and associated manufacturing and assembling issues, solutions to the technological improvements identified in Phase I will be proposed. In order to be able to test these new technologies, it is proposed to integrate them a smaller-scale SW as a demonstrator (5 kW power level). The use of a smaller demonstrator solves the problem of available vacuum test facilities and allows to put forward the added value of these new technologies for current power-class HETs. A specific test campaign shall be defined and performed for each of the technologies to be demonstrated. Deliverables: Technical note (prel. design/performance report and mechanical/thermal analyses for 25 kW HET; critical technol./manuf. processes; updated design + critical technol. for 5 kW demonstrator; technology demo test plan/results). Demonstrator. Current TRL: TRL2 Target TRL: TRL3-4 Application Need/Date: TRL5 >2009 High power telecommunication missions (>2012) and interplanetary missions for Application/Mission: Exploration and science (>2012) will be Contract Duration: 24 months the main objectives for this technology. SW Clause : - Dossier0 Ref.: T-968 Consistency with Harmonisation Roadmap and Conclusions: Page 197 of 227
TRP Work Plan 2005-2007 Description of Activities TEC-SB/7935/dc 12/Feb/09 TRP Reference: Title: T601-42MP Development of a fuel/oxidiser compatible diaphragm The Propellant Expulsion Device (PED) as an alternative to propellant management device (PMD) shows advantages form cost, reliability and general system complexity stand point. Currently such a device is not available in Europe. The interest of this new proposal is both in the need to provide European space industry with autonomy with respect to the international competition and in the compatibility of the proposed material with both Hydrazine and bi propellants which would provide a full H/W commonality between the two main storable propulsion technologies used in Europe.The proposed activity is focused in developing a material which is compatible with both hydrazine (N2H4) and its derivatives (MMH, UDMH) and the oxidiser (MON, NTO) and it is suitable for manufacturing of diaphragms and bladders for spacecraft. Deliverables: Demonstration of material formulation feasibility, demonstration of diaphragm manufacturing feasibility and development testing. Current TRL: TRL2 Target TRL: TRL3-4 Application Need/Date: TRL5 >2011 All satellites prop. / GMES (e.g. Sentinel Application/Mission: Contract Duration: 24 months 2,3,4) SW Clause : - Dossier0 Ref.: T-867 Consistency with Harmonisation Vessels & High Press Tanks Roadmap and Conclusions: TRP Reference: Title: T608-25QC Reliability of MEMS based pressure sensors Deliverables: Current TRL: Target TRL: Application Need/Date: Application/Mission: Contract Duration: SW Clause : - Dossier0 Ref.: Consistency with Harmonisation Roadmap and Conclusions: Page 198 of 227
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document title / titre du document TRP W ORK PLAN ... - emits - ESA

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