EPS HEPP

EPS HEPP
Name	EPS HEPP
Type	Power and propulsion payload
Operator	European Space Agency
Status	Active
First flight	2018
Mass	120 kg
Power	1.2 kW
Propulsion	Electric propulsion module

EPS HEPP

EPS HEPP is a modular electric power and propulsion payload designed for small to medium satellite platforms. It integrates high-efficiency Hall effect thruster-derived electric propulsion, advanced solar array management, and integrated power conditioning to provide long-duration stationkeeping, orbit raising, and debris-avoidance maneuvers. The system has been demonstrated on cooperative missions with agencies and firms such as the European Space Agency, Arianespace, Airbus Defence and Space, Thales Alenia Space, and commercial operators including OneWeb and Eutelsat.

Overview

EPS HEPP combines components from multiple suppliers, including xenon-fed ion thruster units, triple-junction solar cell panels, and radiation-hardened power electronics modules. It targets platforms in low Earth orbit that require high delta-v budgets for tasks associated with standards set by organizations like European Committee for Electrotechnical Standardization, International Electrotechnical Commission, and agencies such as NASA and Japan Aerospace Exploration Agency. Typical missions integrate EPS HEPP with structural adapters from firms such as RUAG Space and MDA.

History and Development

Development began as a collaborative initiative among contractors and research institutions including European Space Agency technology programmes, Centre national d'études spatiales, DLR laboratories, and university groups like Imperial College London and Politecnico di Milano. Early testbeds leveraged heritage from projects pursued by Thales Alenia Space, Airbus Defence and Space, and propulsion heritage from companies like Snecma and Safran. Demonstration flights were coordinated with launch providers such as Arianespace and SpaceX and integrated payloads flown on missions alongside satellites from Eutelsat, SES S.A., Inmarsat, and research platforms from ESA’s Vega programmes.

Technical Specifications

The propulsion module houses multiple low-thrust, high-specific-impulse engines derived from Hall effect thruster and gridded ion thruster architectures. Power generation uses triple-junction III-V semiconductor cells mounted on deployable arrays similar to designs from Spectrolab and Airbus Defence and Space. Onboard avionics employ radiation-hardened processors comparable to LEON flight CPUs and utilize power conversion techniques standardized by European Cooperation for Space Standardization. The EPS HEPP stack typically provides 0.5–2.0 kW continuous onboard power, 1–60 mN thrust per thruster, and specific impulse in the range of 1,500–3,000 seconds, drawing on propellant management systems compatible with xenon and alternative propellants investigated by ESA and NASA.

Safety and Environmental Considerations

Design and testing reference safety regimes endorsed by European Space Agency programmes and international bodies such as International Organization for Standardization. Thermal control borrows heritage from passive and active systems developed by Airbus Defence and Space and Thales Alenia Space to mitigate spacecraft charging and plume impingement effects studied in laboratories at DLR and CNES test facilities. Propellant handling follows hazardous materials standards aligned with regulations applicable in launch sites operated by Guiana Space Centre and Baikonur Cosmodrome, with contingency procedures coordinated with agencies such as European Commission and national space agencies including UK Space Agency.

Operational Use and Applications

Operators employ EPS HEPP for orbit raising, geostationary transfer orbit circularization, constellation maintenance for operators like OneWeb and Iridium-class services, debris mitigation in accordance with Space Debris Mitigation Guidelines endorsed by the United Nations Office for Outer Space Affairs, and precision attitude control for science missions similar to those run by ESA and NASA. Integration is common on platforms built by Airbus Defence and Space, Thales Alenia Space, OHB System AG, and bespoke smallsat integrators such as GomSpace and Planet Labs. Mission planning tools interoperate with guidance and navigation software from providers like GMV and RAL Space.

Regulatory and Standards Compliance

Certification aligns with standards issued by European Cooperation for Space Standardization, International Organization for Standardization, and safety protocols recognized by European Space Agency procurement. Launch approvals require coordination with national regulators overseeing facilities like Guiana Space Centre, Vandenberg Space Force Base, and Cape Canaveral Space Force Station, and compliance with international agreements such as the Outer Space Treaty and best practices from United Nations Office for Outer Space Affairs.

Future Developments and Research

Ongoing research focuses on higher-thrust, higher-efficiency thruster designs from collaborations involving DLR, CNES, ESA, and industry partners such as Thales Alenia Space, Snecma, Airbus Defence and Space, and startups funded by European Investment Bank initiatives. Areas of exploration include alternative propellants like krypton and iodine, advanced solar electric propulsion architectures, integrated power and thermal management derived from projects at Imperial College London and Politecnico di Milano, and scalability for deep-space demonstration missions in cooperation with NASA and interagency programmes.

Category:Spacecraft components