The Open UniversitySkip to content
 

A study of electron-multiplying CCDs for use on the International X-ray Observatory off-plane x-ray grating spectrometer

Tutt, James. H.; Holland, Andrew D.; Murray, Neil J.; Hall, David J.; McEntaffer, Randall L.; Endicott, James and Robbins, Mark (2010). A study of electron-multiplying CCDs for use on the International X-ray Observatory off-plane x-ray grating spectrometer. Proceedings - SPIE the International Society for Optical Engineering, 7742(774205)

Full text available as:
[img]
Preview
PDF (Accepted Manuscript) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (1315Kb)
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1117/12.861626
Google Scholar: Look up in Google Scholar

Abstract

CCDs are regularly used as imaging and spectroscopic devices on space telescopes at X-ray energies due to their high quantum efficiency and linearity across the energy range. The International X-ray Observatory's X-ray Grating Spectrometer will also look to make use of these devices across the energy band of 0.3 keV to 1 keV. At these energies, when photon counting, the charge generated in the silicon is close to the noise of the system. In order to be able to detect these low energy X-ray events, the system noise of the detector has to be minimised to have a sufficient signal-to-noise-ratio. By using an EM-CCD instead of a conventional CCD, any charge that is collected in the device can be multiplied before it is read out and as long as the EM-CCD is cool enough to adequately suppress the dark current, the signal-to-noise ratio of the device can be significantly increased, allowing soft X-ray events to be more easily detected. This paper will look into the use of EM-CCDs for the detection of low energy X-rays, in particular the effect that using these devices will have on the signal to noise ratio as well as any degradation in resolution and FWHM that may occur due to the additional shot noise on the signal caused by the charge packet amplification process.

Item Type: Journal Article
Copyright Holders: 2010 Society of Photo-Optical Instrumentation Engineers, one print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
ISSN: 0277-786X
Keywords: IXO; OP-XGS; CCD; EM-CCD; L3; X-ray; FWHM; excess noise factor
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 24050
Depositing User: Jason Gow
Date Deposited: 02 Nov 2010 12:17
Last Modified: 25 Nov 2013 21:44
URI: http://oro.open.ac.uk/id/eprint/24050
Share this page:

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk