Dr. Caleb H. Wheeler Profile

Dr. Caleb H. Wheeler

Postdoctoral Scholar at Southwest Research Institute

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Author

Publications (12)

Proceedings Article | 13 December 2020 Presentation + Paper

In-flight performance of the BLAST-TNG telescope platform

Gabriele Coppi, Peter A. Ade, Peter Ashton, Jason Austermann, Erin Cox, Mark Devlin, Bradley Dober, Valentina Fanfani, Laura Fissel, Nicholas Galitzki, Jiansong Gao, Samuel Gordon, Christopher Groppi, Gene Hilton, Johannes Hubmayr, Jeffrey Klein, Dale Li, Ian Lowe, Nathan Lourie, Christopher McKinney, Hamdi Mani, Philip Mauskopf, Federico Nati, Giles Novak, Giampaolo Pisano, Javier Romualdez, Adrian Sinclair, Juan Soler, Carole Tucker, Joel Ullom, Michael Vissers, Caleb Wheeler, Paul Williams

Proceedings Volume 11445, 1144526 (2020) https://doi.org/10.1117/12.2560849

KEYWORDS: Telescopes, Optical instrument design, Magnetism, Submillimeter telescopes, Mirrors, Spatial resolution, Clouds, Thermography

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Proceedings Article | 13 December 2020 Presentation + Paper

Characterization, deployment, and in-flight performance of the BLAST-TNG cryogenic receiver

Ian Lowe, Peter A. R. Ade, Peter Ashton, Jason Austermann, Gabriele Coppi, Erin Cox, Mark Devlin, Bradley Dober, Valentina Fanfani, Laura Fissel, Nicholas Galitzki, Jiansong Gao, Samuel Gordon, Christopher Groppi, Gene Hilton, Johannes Hubmayr, Jeffrey Klein, Dale Li, Nathan Lourie, Hamdi Mani, Philip Mauskopf, Christopher McKenney, Federico Nati, Giles Novak, Giampaolo Pisano, Javier Romualdez, Juan Soler, Adrian Sinclair, Carole Tucker, Joel Ullom, Michael Vissers, Caleb Wheeler, Paul Williams

Proceedings Volume 11453, 1145304 (2020) https://doi.org/10.1117/12.2560854

KEYWORDS: Cryogenics, Sensors, Receivers, Signal processing, Computing systems, Signal detection, Submillimeter telescopes, Magnetism, Microwave radiation, Inductance

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Proceedings Article | 9 July 2018 Paper

Time tagging individual photons with a low-cost FPGA based time to digital converter

Genady Pilyavsky, Adrian Sinclair, Eric Weeks, Caleb Wheeler, Emily Lunde, Philip Mauskopf

Proceedings Volume 10701, 107012T (2018) https://doi.org/10.1117/12.2313815

KEYWORDS: Photons, Field programmable gate arrays, Sensors, Picosecond phenomena, Clocks, Telescopes, Shape memory alloys, Electronics, Single photon detectors, Interferometry

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Proceedings Article | 8 August 2016 Paper

Efficient receiver tuning using differential evolution strategies

Caleb Wheeler, Trevor Toland

Proceedings Volume 9913, 99130Q (2016) https://doi.org/10.1117/12.2231363

KEYWORDS: Receivers, Optimization (mathematics), Heterodyning, Evolutionary algorithms, Data processing, Astronomy, Time metrology, Terahertz radiation, Magnetism, Staring arrays

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Proceedings Article | 20 July 2016 Paper

Results of using permanent magnets to suppress Josephson noise in the KAPPa SIS receiver

Caleb Wheeler, Marko Neric, Christopher Groppi, Matthew Underhill, Hamdi Mani, Sander Weinreb, Damon Russell, Jacob Kooi, Arthur Lichtenberger, Christopher Walker, Craig Kulesa

Proceedings Volume 9914, 99141W (2016) https://doi.org/10.1117/12.2231358

KEYWORDS: Magnetism, Receivers, Magnetic sensors, Sensors, Heterodyning, Solar concentrators, Neodymium, Superconductors, Tolerancing, Calibration

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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 | 23 July 2014 Paper

Methodology for a sub-millimeter near-field beam pattern measurement system

Kristina Davis, Chris Groppi, Hamdi Mani, Caleb Wheeler, Chris Walker

Proceedings Volume 9153, 91533F (2014) https://doi.org/10.1117/12.2056844

KEYWORDS: Receivers, Near field, Optical testing, Phase measurement, Antennas, Calibration, Reliability, Network security, Algorithm development, Diodes

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Proceedings Article | 23 July 2014 Paper

The kilopixel array pathfinder project (KAPPa), a 16-pixel integrated heterodyne focal plane array: characterization of the single pixel prototype

Caleb Wheeler, Christopher Groppi, Hamdi Mani, Patrick McGarey, Linda Kuenzi, Sander Weinreb, Damon Russell, Jacob Kooi, Arthur Lichtenberger, Christopher Walker, Craig Kulesa

Proceedings Volume 9153, 91530K (2014) https://doi.org/10.1117/12.2056606

KEYWORDS: Receivers, Sensors, Computing systems, Staring arrays, Prototyping, Terahertz radiation, Clouds, Control systems, Magnetism, Black bodies

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Proceedings Article | 23 July 2014 Paper

A 16-channel flex circuit for cryogenic microwave signal transmission

Patrick McGarey, Hamdi Mani, Caleb Wheeler, Christopher Groppi

Proceedings Volume 9153, 91532F (2014) https://doi.org/10.1117/12.2055472

KEYWORDS: Flexible circuits, Connectors, Copper, Staring arrays, Cryogenics, Shape memory alloys, Electromagnetic coupling, Microwave radiation, Heterodyning, Multilayers

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Heterodyne focal plane arrays used in the terahertz (THz) regime currently require a discrete set of rigid coaxial cables for the transmission of individual intermediate frequency (IF) signals. Consequently, the size of an array is limited to ~10s of pixels due to limited physical space and the complexity of assembly. In order to achieve an array with ~1000 pixels or greater, new interconnections must be developed capable of carrying multiple IF signals on a single carrier which is flexible, robust to noise, and terminated with a high density RF connector. As an intermediate step to the development of a ~1000 pixel heterodyne focal plane array, the Kilopixel Array Pathfinder Project (KAPPa) has developed a 16 channel IF flex circuit. Initially, design simulations were performed to evaluate various means of high-frequency (1~10 GHz) signal transmission, including microstrip, stripline and coplanar waveguides. The method allowing for the closest signal spacing and greatest resistance to radio frequency interference (RFI) was determined to be stripline. Designs were considered where stripline transitioned to microstrip in order to terminate the signal. As microstrip transmission lines are sensitive to RFI, a design featuring just stripline was evaluated. In both the stripline-to-microstrip and stripline-only designs, a three-layer copper-coated polyimide substrate was used. Signal transitions were accomplished by a signal carrying “hot” via passing through a series of three conductive pads, similar to work by Leib et al. (2010). The transition design essentially mimics a coaxial line, where the radial distance between the pads and the ground plane is optimized in order to achieve desired impedances. In simulation, 50 Ohm impedances were achieved throughout, with crosstalk and return loss limited to -30dB. Terminations are made via an array of Corning Gilbert G3PO blind mate connectors, which are small enough to match the 6mm pixel pitch of the KAPPa focal plane unit. In addition, circuits with SMA terminations were designed to enable straightforward testing with a vector network analyzer (VNA). Initial designs use ½ oz. (18 microns thickness) copper conductors. In the KAPPa application, the copper conductor is still suitable for cryogenic applications because of the very small cross section presented by the copper conductor. The stripline design allows the interconnect to be clamped securely for heat sinking with a copper clamp at 10K and 60K. Heat load to the 4K stage is limited to 10 mW if the circuit is heat sunk at 10K 150mm from the 4K focal plane. Future designs could be implemented with phosphor bronze as the conductor to further limit heat load at the expense of added loss.

Proceedings Article | 23 July 2014 Paper

An automated test system for terahertz receiver characterization

Linda Kuenzi, Christopher Groppi, Caleb Wheeler, Hamdi Mani

Proceedings Volume 9153, 91532C (2014) https://doi.org/10.1117/12.2054849

KEYWORDS: Receivers, Aluminum, Sensors, Staring arrays, Terahertz radiation, Black bodies, Nitrogen, Diodes, Computing systems, Reflectivity

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Proceedings Article | 24 September 2012 Paper

The Kilopixel Array Pathfinder Project (KAPPa), a 16 pixel integrated heterodyne focal plane array

Christopher Groppi, Caleb Wheeler, Hamdi Mani, Patrick McGarey, Todd Veach, Sander Weinreb, Damon Russell, Jacob Kooi, Arthur Lichtenberger, Christopher Walker, Craig Kulesa

Proceedings Volume 8452, 84520Y (2012) https://doi.org/10.1117/12.927358

KEYWORDS: Staring arrays, Computer aided design, Heterodyning, Terahertz radiation, Waveguides, Sensors, Connectors, Amplifiers, Receivers, Cryogenics

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Proceedings Article | 15 July 2010 Paper

Optical properties of astronomical silicates with infrared techniques

R. Kinzer, S. Rinehart, D. Benford, E. Dwek, R. Henry, J. Nuth, R. Silverberg, C. Wheeler, E. Wollack

Proceedings Volume 7741, 774128 (2010) https://doi.org/10.1117/12.857569

KEYWORDS: Silicates, Crystals, Dielectrics, Astronomy, Infrared radiation, Optical properties, Sensors, Solids, Waveguides, Fourier transforms

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Showing 5 of 12 publications

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