Dr. Christopher N. Thomas Profile

Dr. Christopher N. Thomas

at Univ of Cambridge

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Author

Publications (9)

Proceedings Article | 22 May 2023 Presentation + Paper

Sensitivity of transition-edge sensors to strong DC electric fields

K. Patel, D. Goldie, S. Withington, C. Thomas

Proceedings Volume 12327, 123270B (2023) https://doi.org/10.1117/12.2666646

KEYWORDS: Electric fields, Particles, Electrons, Electric field sensors, Electrical conductivity, Superconductors, Absorption

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Proceedings Article | 31 August 2022 Presentation + Paper

A route to large-scale ultra-low noise detector arrays for far-infrared space applications

David Goldie, Stafford Withington, Christopher Thomas, Peter A. Ade, Rashmi Sudiwala

Proceedings Volume 12190, 121900J (2022) https://doi.org/10.1117/12.2629954

KEYWORDS: Sensors, Detector arrays, Astronomical detectors, Far infrared

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Proceedings Article | 13 December 2020 Poster + Paper

A millimeter-wave on-chip superconducting filter bank spectrometer for atmospheric science

A. Orlando, C. Thomas, D. Goldie, P. Hargrave, R. Sudiwala, P. K. Dongre, S. Withington

Proceedings Volume 11453, 114533F (2020) https://doi.org/10.1117/12.2564383

KEYWORDS: Spectroscopy, Superconductors, Optical filters, Atmospheric sciences, Astronomical instrumentation, Oxygen, Astronomy, Sensors, Microwave radiation, Atmospheric sensing

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Proceedings Article | 13 December 2020 Presentation + Paper

Optical and electrical transient response of ultra-low-noise far-infrared transition edge sensors for the SAFARI instrument on SPICA

E. Williams, S. Withington, D. Goldie, C. Thomas, P. A. Ade, R. Sudiwala, I. Walker

Proceedings Volume 11453, 114530J (2020) https://doi.org/10.1117/12.2562375

KEYWORDS: Cryogenics, Spectroscopy, Space telescopes, Telescopes, Sensors, Optical testing, Thermography, Imaging systems, Calibration, Modulation

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Proceedings Article | 9 October 2018 Presentation + Paper

Information content analysis for a novel TES-based hyperspectral microwave atmospheric sounding instrument

Prateek Kumar Dongre, Stephan Havemann, Peter Hargrave , Angiola Orlando, Rashmikant Sudiwala, Stafford Withington, Chris Thomas, David Goldie

Proceedings Volume 10786, 1078608 (2018) https://doi.org/10.1117/12.2500516

KEYWORDS: Microwave radiation, Error analysis, Radiometry, Spectral resolution, Humidity, Atmospheric modeling, Satellites, Sensors, Spectrometers

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Proceedings Article | 9 July 2018 Presentation + Paper

Ultra-low-noise transition edge sensors for far infrared wavelengths: optical design, measurement and stray light control

E. Williams, S. Withington, D. Goldie, C. Thomas, J. Chen, P. A. Ade, R. Sudiwala, I. Walker, N. Trappe

Proceedings Volume 10708, 107081W (2018) https://doi.org/10.1117/12.2313611

KEYWORDS: Sensors, Stray light, Optical testing, Optical design, Optical filters, Superconducting detectors, Space telescopes, Far infrared

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Proceedings Article | 30 August 2017 Presentation + Paper

Probing infrared detectors through energy-absorption interferometry

Dan Moinard, Stafford Withington, Christopher Thomas

Proceedings Volume 10404, 104040J (2017) https://doi.org/10.1117/12.2271622

KEYWORDS: Sensors, Infrared detectors, Interferometry, Holography, Solid state electronics, Spatial coherence, Visibility, Correlation function, Infrared radiation, Detector arrays

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Proceedings Article | 23 July 2014 Paper

Instrumentation for single-dish observations with The Greenland Telescope

Paul Grimes, K. Asada, R. Blundell, R. Burgos, H-H. Chang, M. Chen, D. Goldie, C. Groppi, C. Han, P. T. Ho, Y. Huang, M. Inoue, D. Kubo, P. Koch, J. Leech, E. de Lera Acedo, P. Martin-Cocher, H. Nishioka, M. Nakamura, S. Matsushita, S. Paine, N. Patel, P. Raffin, W. Snow, T. Sridharan, R. Srinivasan, C. Thomas, E. Tong, M.-J. Wang, C. Wheeler, S. Withington, G. Yassin, L.-Z. Zeng

Proceedings Volume 9153, 91531V (2014) https://doi.org/10.1117/12.2056969

KEYWORDS: Antennas, Telescopes, Terahertz radiation, Prototyping, Galactic astronomy, Astronomy, Heterodyning, Receivers, Field programmable gate arrays, Observatories

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The Greenland Telescope project will deploy and operate a 12m sub-millimeter telescope at the highest point of the Greenland i e sheet. The Greenland Telescope project is a joint venture between the Smithsonian As- trophysical Observatory (SAO) and the Academia Sinica Institute of Astronomy and Astrophysics (ASIAA). In this paper we discuss the concepts, specifications, and science goals of the instruments being developed for single-dish observations with the Greenland Telescope, and the coupling optics required to couple both them and the mm-VLBI receivers to antenna. The project will outfit the ALMA North America prototype antenna for Arctic operations and deploy it to Summit Station,1 a NSF operated Arctic station at 3,100m above MSL on the Greenland I e Sheet. This site is exceptionally dry, and promises to be an excellent site for sub-millimeter astronomical observations. The main science goal of the Greenland Telescope is to carry out millimeter VLBI observations alongside other telescopes in Europe and the Americas, with the aim of resolving the event horizon of the super-massive black hole at the enter of M87. The Greenland Telescope will also be outfitted for single-dish observations from the millimeter-wave to Tera-hertz bands. In this paper we will discuss the proposed instruments that are currently in development for the Greenland Telescope - 350 GHz and 650 GHz heterodyne array receivers; 1.4 THz HEB array receivers and a W-band bolometric spectrometer. SAO is leading the development of two heterodyne array instruments for the Greenland Telescope, a 48- pixel, 325-375 GHz SIS array receiver, and a 4 pixel, 1.4 THz HEB array receiver. A key science goal for these instruments is the mapping of ortho and para H2D+ in old protostellar ores, as well as general mapping of CO and other transitions in molecular louds. An 8-pixel prototype module for the 350 GHz array is currently being built for laboratory and operational testing on the Greenland Telescope. Arizona State University are developing a 650 GHz 256 pixel SIS array receiver based on the KAPPa SIS mixer array technology and ASIAA are developing 1.4 THz HEB single pixel and array receivers. The University of Cambridge and SAO are collaborating on the development of the CAMbridge Emission Line Surveyor (CAMELS), a W-band `on- hip' spectrometer instrument with a spectral resolution of R ~ 3000. CAMELS will consist of two pairs of horn antennas, feeding super conducting niobium nitride filter banks read by tantalum based Kinetic Inductance Detectors.

Proceedings Article | 21 July 2008 Paper

A new experimental procedure for determining the response of bolometric detectors to fields in any state of spatial coherence

C. Thomas, S. Withington

Proceedings Volume 7020, 70201Z (2008) https://doi.org/10.1117/12.787409

KEYWORDS: Sensors, Bolometers, Antennas, Spatial coherence, Polarization, Black bodies, Absorption, Visibility, Imaging arrays, Telescopes

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