Neil J. Murray

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Electron Multiplying Charge-Coupled Devices (EMCCDs) are used in low-light-level (L3) applications for detecting optical, Ultra-Violet (UV) and Near Infra-Red (NIR) photons (10 nm to 1100 nm). The on-chip gain process is able to increase the detectability of any signal collected by the device through the multiplication of the signal before the output node,(More)
The charge transfer efficiency of a CCD is based on the average level of signal lost per pixel over a number of transfers. This value can be used to directly compare the relative performances of different structures, increases in radiation damage or to quantify improvements in operating parameters. This number does not however give sufficient detail to(More)
A number of studies have demonstrated that a room temperature proton irradiation may not be sufficient to provide an accurate estimation of the impact of the space radiation environment on detector performance. This is a result of the relationship between defect mobility and temperature, causing the performance to vary subject to the temperature history of(More)
The science goals of space missions from the Hubble Space Telescope through to Gaia and Euclid require ultra-precise positional, photometric and shape measurement information. However, in the radiation environment of the space telescopes, damage to the focal plane detectors through high energy protons leads to the creation of traps, a loss of charge(More)
Euclid is a medium class European Space Agency mission candidate for launch in 2019 with a primary goal to study the dark universe using the weak lensing and baryonic acoustic oscillations techniques. Weak lensing depends on accurate shape measurements of distant galaxies. Therefore it is beneficial that the effects of radiation-induced charge transfer(More)
Euclid is a medium class mission selected for launch in 2019, with a primary goal to study the dark universe using the weak lensing and baryonic acoustic oscillations techniques. Weak lensing depends on accurate shape measurements, therefore it is beneficial that the effects of radiation-induced charge transfer inefficiency (CTI) in the Euclid CCD over the(More)
As electrons are transferred through a radiation damaged Charge Coupled Device (CCD), they may encounter traps in the silicon in which they will be captured and subsequently released. This capture and release of electrons can lead to a ‘smearing’ of the image. The dynamics of the trapping process can be described through the use of Shockley-Read-Hall(More)
The ESA Euclid mission aims to answer the question of how the universe originated through the mapping of the dark Universe. One method to investigate this geometry is to measure subtle changes in ellipticity using image sensors such as the CCD. However, the radiation environment in space plays a major part in the performance of CCD-based camera systems.(More)
A CCD273 was irradiated in a triangular region by protons to a 10 MeV equivalent fluence of 1.2E9 p.cm -2 , ensuring a suitably low trap density for the development of an automated trap recognition algorithm. X-rays of 5,898 eV were incident on the CCD above the region irradiated with the triangle, such that events could be analysed having passed through an(More)
Comparisons have been made of the relative degradation of charge transfer efficiency in n-channel and p-channel CCDs subjected to proton irradiation. The comparison described in this paper was made using e2v technologies plc. CCD204 devices fabricated using the same mask set. The device performance was compared over a range of temperatures using the same(More)