TEC-EES Final Presentation Day 2013

Friday 6 Dec 2013, 09:30 → 17:15 Europe/Amsterdam

Newton 1 conference room (ESTEC)

The room has changed to NEWTON 1.

Programme:
A number of final presentations and status reports will be presented on studies carried out on behalf of TEC-EES (Space environment and effects) section. Please see Timetable for details

• Charging Properties of Space Materials - Thierry Paulmier (ONERA)
• SPIS5.1 - Jean-Charles Mateo-Velez (ONERA), Benoit Thiebault (Artenum)
• Energetic Particle Telescope Phase C/D - Mathias Cyamukungu (UCL)
• Interplanetary and Planetary Radiation Modelling for Human Spaceflight - Daniel Heynderickx (DHC)
• Ganymede Radiation Environment Engineering - Pete Truscott (Kallisto)
• Slot Region Radiation Environment Modelling - Daniel Heynderickx (DHC)
• Dictatv4 validation - Fan Lei (Radmod UK)
• Open Data Interface update - Peter Wintoft (IRF)
• NASA AE9/AP9 Radbelt model integration - Daniel Heynderickx (DHC)

09:30 → 17:15 Session 1

09:30 Charging Properties of Space Materials

Charging effects are usually dominated by two main parameters: electron emission [yield and spectrum] (under electron or photon irradiation) and bulk conductivity (intrinsic and radiation induced [instantaneous or delayed]). These data are needed by the community to perform charging predictions for assigned missions. This study was divided into two overall main tasks: the first task was dedicated to the measurement of electron emission yield and spectrum on common space materials in a representative incident energy range. Five different materials have therefore been tested in this task: Aluminized Kapton-50µm, CRFP, CMX-100 UVS, CMX-150 AR, CMX covered with ITO. The second main task of this study was dedicated to the characterisation of bulk and radiation induced conductivity of polymers and non-polymers (ceramics and glasses) and their evolution in regard of sample reproducibility, composition and structure variation and environmental conditions (radiation dose rate, temperature). Four different polymers have been tested in this study: FEP, PEEK, ETFE and silicon adhesives. Three non-polymer materials have been tested as well: CMG glass, Borosilicate glass from Schott, Aluminium oxide Al2O3. The major objective in this last task was, for polymers, to understand physical variations of conductivity of similar materials and, for non-polymers, to get better knowledge on the main physical contributions steering bulk and radiation induced conductivity at low temperature.

Speaker: Dr Thierry Paulmier (ONERA)

Slides Final_presentation_-_Paulmier-final.pdf

10:30 questions

10:35 Coffee break

10:50 SPIS5.1

The Spacecraft Plasma Inteaction Software (SPIS) has recently undergone a major update. Through two ESA contracts, the ability of users to model hazardous charging levels in a geostationary orbit and the ability to simulate the detailed interactions of plasma with scientific satellites was developed. This produced new and improved capabilities and a completely new user interface.

Speakers: Dr Benoit Thiebault (Artenum), Dr Jean-Charles Mateo-Velez (ONERA)

Slides SPIS-5.1.0-demo-720p-2.mov

11:30 questions

11:35 Energetic Particle Telescope Phase C/D

Speaker: Dr Mathias Cyamukungu (UCL/CSR)

Slides EPT-HO-00835-QS_A0_Final_Presentation.pdf

12:35 questions

12:40 Lunch

13:40 Interplanetary and Planetary Radiation Modelling for Human Spaceflight

Gaps in existing radiation environment and effects standards adversely affect human spaceflight developments. In the framework of the ESA project IPRAM (Interplanetary and Planetary RadiationModel for Human Spaceflight, ESA Contract No 4000106133/12/NL/AF), we investigated the most important drivers in the domain of interplanetary and planetary radiation environments, identifying appropriate data sources and modelling methods to address the needs of future interplanetary manned mission design and operation. New radiation estimates have been compiled for missions to the Moon, Mars, and a near-Earth asteroid, combining a comprehensive set of spacecraft and neutron monitor data with statistical models. A roadmap for future developments is presented, as well as a gap analysis of environment data and models of the radiation environment and effects on humans and spacecraft components.

Speaker: Dr Daniel Heynderickx (DH Consultancy BVBA)

Slides IPRAM_FP.pdf

14:20 questions

14:25 Ganymede Radiation Environment Engineering

The Jovian radiation environment presents a severe threat to spacecraft operation due to the large magnetic field of Jupiter allowing it to stably trap charged particles, especially electrons, at higher energies and over greater distances than found in Earth’s Van Allen belts. As part of the ESA Laplace mission, an assessment is ongoing into the different hardening and alternative radiation mitigation strategies which may be implemented to reduce the threat from ionising and non-ionising cumulative dose, and spacecraft charging. Since a significant fraction of the Laplace spacecraft’s time within the Jovian magnetosphere will involve orbiting the moon Ganymede, the shielding offered by the intrinsic magnetic field of the moon, and physical shielding of the moon to the rotating plasmasphere should be assessed. Tracking particles within the complex rotating magnetic fields of Jupiter and Ganymede, and the probability of interactions with the moon’s surface is a non trivial calculation. Currently this can be achieved using the Geant4-based PLANETOCOSMICS-J (PCJ) model developed as part of the JORE2M2 Project, but the lengthy simulation times make it difficult to use this as an engineering tool to explore the influence of the moon for different mission and orbital scenarios. The objectives of the work are to develop and validate a SPENVIS-based software tool to perform fast simulation of the radiation environment for orbits and spacecraft trajectories in the vicinity of Ganymede. This is to be based on a database of results from the PLANETOCOSMICS-J model for the transmitted fraction of electrons as a function of Ganymede longitude, latitude, altitude, electron energy and location of Ganymede within the Jovian magnetosphere. The Ganymede Radiation Environment Engineering Tool (GREET) will combine the transmission fraction with the JOSE electron environment model and orbital information to generate electron fluxes and energy spectra.

Speaker: Dr Pete Truscott (Kallisto Consultancy Ltd)

Slides FR_GREET_20131206.2.pdf

14:45 questions

14:50 Slot Region Radiation Environment Modelling

Speaker: Dr Daniel Heynderickx (DH Consultancy BVBA)

Slides SRREM_FP.pdf

15:30 questions

15:35 Coffee break

15:50 Dictatv4 validation

Dictat has become a commonly used tool for internal charging assessment. To support JUICE analysis, an updated version was released which could be applied over a wider energy range and included high-Z materials. Because this involved a significant evolution from the earlier versions of the code a validation excercise was carried out. Dictatv4 was compared to experimental data and to other analysis codes. These comparisons are described in this presentation.

Speaker: Dr Fan Lei (RadMod Research)

Slides dictat4-validation_final_presentation.pdf

16:20 questions

16:25 Open Data Interface update

Open Data Interface (ODI) is a database system for storing space environment data and metadata in an SQL database. It is compliant with CDF and SPASE data models. The system contains both server and client software. The server software comes with a set of tools, e.g. data download tool, data ingestion tool, tools to convert CDF metadata to SPASE metadata, tool to set up automatic cron jobs, etc. Currently there are metadata and download scripts defined for more than 100 datasets. The client software allows a user to select a specific ODI instance and perform queries on the database. Graphical user interface and web service prototypes have also been developed to demonstrate extensions of the system.

Speaker: Dr Peter Wintoft (IRF)

Slides wintoft2013odi.pdf

16:45 questions

16:50 NASA AE9/AP9 Radbelt model integration

Since the beginning of the space age, considerable effort was invested in building models of the trapped proton and electron populations, culminating in the NASA AP-8 and AE-8 models which have been the de facto standards since the seventies. In the intervening years, there have been several new models created, but none with the coverage in energy or space provided by these original models. Recently, a new version of these models (preliminary called AP9/AE9) has been released with significantly improved capabilities and including a significantly greater quantity of data. The first usage of the AP9/AE9 model in radiation analysis applications has revealed significant differences with results obtained with older radiation belt models for some orbit types. Consequently, an ESA sponsored activity was started to validate the new model results against other radiation belt models and in situ datasets. In addition, the optimal implementation of the new models in existing ESA software packages and tools was investigated. The conclusions of the validation activity will lead to recommendations for updates to the ECSS-E-ST-10-04 space environment standard.

Speaker: Dr Daniel Heynderickx (DH Consultancy BVBA)

Slides IRENE_FP.pdf

17:10 questions