Factors Affecting EMCCD Technology for Use in Space

This thesis is an assessment of factors of the EMCCD that may prevent this technology from being used in the space environment. The factors of interest here are EMCCD ageing, radiation effects from gamma rays and protons, and finally, single event susceptibility to heavy ions. The theory and architecture of the CCD and EMCCD are described with the aim of providing a technical basis in which to explore the results. The practical methods and novel experimental techniques carried out in this thesis are also described. However, EMCCD ageing is the primarily focus of this work concentrating on characterisation, understanding and then an experimental investigation into uncovering the cause of the phenomenon. Many EMCCDs (CCD97s) were tested with a cause of ageing being attributed to hot hole trapping in the oxide layer. Radiation effects regarding the effects that gamma-rays and protons have on EMCCDs, specifically the ageing, is also investigated. This analysis has shown that gamma-ray radiation in particular, has a large effect on the ageing and gain of these devices. In addition to this work is an experimental campaign to investigate the susceptibility to heavy ions primarily focussing on Single event Gate Rupture; showing EMCCDs to be a resilient against this type of error

The noise performance of electron-multiplying charge-coupled devices at soft X-ray energy values

The use of electron-multiplying charge-coupled devices (CCDs) for high-resolution soft X-ray spectroscopy has been proposed in previous studies, and the analysis that followed experimentally identified and verified a modified Fano factor for X-ray detection using an 55Fe X-ray source. However, further experiments with soft X-rays at 1000 eV were less successful, attributed to excessive split events. More recently, through the use of deep-depletion e2v CCD220 and on-chip binning, it has been possible to greatly reduce the number of split events, allowing the result for the modified Fano factor at soft X-ray energy values to be verified. This paper looks at the earlier attempt to verify the modified Fano factor at 1000 eV with e2v CCD97 and shows the issues created by splitting of the charge cloud between pixels. It then compares these earlier results with new data collected using e2v CCD220, investigating how split-event reduction allows the modified Fano factor to be verified for low-energy X-rays

LUVMI: an innovative payload for the sampling of volatiles at the Lunar poles

The ISECG identifies one of the first exploration steps as in situ investigations of the moon or asteroids. Europe is developing payload concepts for drilling and sample analysis, a contribution to a 250kg rover as well as for sample return. To achieve these missions, ESA depends on international partnerships. Such missions will be seldom, expensive and the drill/sample site selected will be based on observations from orbit not calibrated with ground truth data. Many of the international science community’s objectives can be met at lower cost, or the chances of mission success improved and the quality of the science increased by making use of an innovative, low mass, mobile robotic payload following the LEAG recommendations. LUVMI provides a smart, low mass, innovative, modular mobile payload comprising surface and subsurface sensing with an in-situ sampling technology capable of depth-resolved extraction of volatiles, combined with a volatile analyser (mass spectrometer) capable of identifying the chemical composition of the most important volatiles. This will allow LUVMI to: traverse the lunar surface prospecting for volatiles; sample subsurface up to a depth of 10 cm (with a goal of 20 cm); extract water and other loosely bound volatiles; identify the chemical species extracted; access and sample permanently shadowed regions (PSR). The main innovation of LUVMI is to develop an in situ sampling technology capable of depth-resolved extraction of volatiles, and then to package within this tool, the analyser itself, so as to maximise transfer efficiency and minimise sample handling and its attendant mass requirements and risk of sample alteration. By building on national, EC and ESA funded research and developments, this project will develop to TRL6 instruments that together form a smart modular mobile payload that could be flight ready in 2020. The LUVMI sampling instrument will be tested in a highly representative environment including thermal, vacuum and regolith simulant and the integrated payload demonstrated in a representative environment

Lunar Volatiles Mobile Instrumentation (LUVMI) Project Results

LUVMI is an innovative, low mass, mobile robotic payload designed specifically for operations at the South Pole of the Moon with a range of several kilometres. Over the 2 past years of the project, the key LUVMI scientific instruments (volatiles analyser and volatiles sampler) were successfully developed and validated up to TRL 5-6. In addition, a ground prototype of the LUVMI rover was developed and tested in a series of outdoor trials, in rocky and sandy environments. This rover, with a target dry mass of ~40kg for a flight version, features an adjustable height chassis to adapt to terrain roughness and allowing to bring instruments very closely and precisely to the surface. The locomotion capability of the LUVMI rover was tested in partially representative conditions, as part of the project. This paper reports on the project’s results and lessons learnt, and gives indications of how LUVMI may be further matured to target potential mission slots in the mid-2020s, as part of ESA mission and/or supported by private funding

Assessing the Distribution of Water Ice and Other Volatiles at the Lunar South Pole with LUVMI-X: A Mission Concept

The search for exploitable deposits of water and other volatiles at the Moon’s poles has intensified considerably in recent years, due to the renewed strong interest in lunar exploration. With the return of humans to the lunar surface on the horizon, the use of locally available resources to support long-term and sustainable exploration programs, encompassing both robotic and crewed elements, has moved into focus of public and private actors alike. Our current knowledge about the distribution and concentration of water and other volatiles in the lunar rocks and regolith is, however, too limited to assess the feasibility and economic viability of resource-extraction efforts. On a more fundamental level, we currently lack sufficiently detailed data to fully understand the origins of lunar water and its migration to the polar regions. In this paper, we present LUVMI-X, a mission concept intended to address the shortage of in situ data on volatiles on the Moon that results from a recently concluded design study. Its central element is a compact rover equipped with complementary instrumentation capable of investigating both the surface and shallow subsurface of illuminated and shadowed areas at the lunar south pole. We describe the rover and instrument design, the mission’s operational concept, and a preliminary landing-site analysis. We also discuss how LUVMI-X fits into the diverse landscape of lunar missions under development

Development of light-field motion tracking technology for use in laboratory studies of planet formation

Modelling of planet formation requires empirical data on the collisions involved in the earliest stages of the process. Laboratory-based studies are required to gain this data by colliding dusty, icy particles in conditions analogous to those found in protoplanetary disks. Having technology to capture experimental footage and extract the three-dimensional motions of ensembles of particles is crucial to generating accurate collisional data within a practical timeframe. The cost of microgravity-based experiments drives a need to minimize the form-factor of such an imaging system leading this work to use light-field techniques to provide the depth element of tracking from a single camera. This work focused on the development of software to be used to perform light-field based, three-dimensional tracking and its application to real-time analysis of mm-scale particle collisions

LUVMI: A concept of low footprint lunar volatiles mobile instrumentation

The International Space Exploration Coordination Group (ISECG) identifies one of the first exploration steps as in situ investigations of the Moon or asteroids. Europe is developing payload concepts for drilling and sample analysis, a contribution to a 250kg rover as well as for sample return. To achieve these missions, ESA depends on international partnerships. Such missions will be seldom, expensive and the drill/sample site selected will be based on observations from orbit not calibrated with ground truth data. Many of the international science community’s objectives can be met at lower cost, or the chances of mission success improved and the quality of the science increased by making use of an innovative, low mass, mobile robotic payload following the LEAG recommendations. As a main objective LUVMI is designed specifically for operations at the South Pole of the Moon with a payload accommodated by a novel lightweight mobile platform (rover) with a range of several kilometers. Over the 2 years duration of the project, the scientific instruments payload will be developed and validated up to TRL 6. LUVMI targets being ready for flight in 2020 on an ESA mission partially supported by private funding

How Fragmentation Can Improve Co-ordination: Setting Standards in International Telecommunications

There is a stark contrast between the way industrial economics asks us to think about standard setting in telecommunications and the way standard-setting is actually organized. On the one hand, leading scholars maintain that standard setting is a natural monopoly. On the other hand, the number of standards organizations for telecommunications is quite large and there is no indication that this number will decrease. The paper analyzes how to resolve this discrep ancy. It argues that there are reasons to believe that the natural monopoly hypothesis is wrong. Under a certain set of conditions which are prevalent in international telecommunications, the distribution of standard setting to a multitude of competing standards organizations is both stable and efficient