Mr. Ryan McGeehan Profile

Ryan McGeehan

at Kavli Institute for Cosmological Physics

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Author

Publications (4)

Proceedings Article | 10 July 2018 Presentation

On-sky demonstration of the SuperSpec millimeter-wave spectrometer (Conference Presentation)

Kirit Karkare, Peter Barry, C. Matt Bradford, Scott Chapman, George Che, Jason Glenn, Sam Gordon, Steven Hailey-Dunsheath, Matthew Hollister, Attila Kovacs, Henry Leduc, Philip Mauskopf, Ryan McGeehan, Chris McKenney, Theodore Reck, Joseph Redford, Erik Shirokoff, Carole Tucker, Jordan Turner, Samantha Walker, Jordan Wheeler, Jonas Zmuidzinas

Proc. SPIE. 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX

KEYWORDS: Spectroscopy, Telescopes, Galactic astronomy, Optical filters, Spectrometer engineering, Spectroscopes, Tin, Inductance, Sensors, Control systems

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Proceedings Article | 10 July 2018 Presentation

SuperSpec: the on-chip spectrometer: characterization of a full 300 channel filterbank (Conference Presentation)

Jordan Wheeler, Steve Hailey-Dunsheath, Erik Shirokoff, Peter Barry, Charles Bradford, Scott Chapman, George Che, Simon Doyle, Jason Glenn, Sam Gordon, Matthew Hollister, Atilla Kovacs, Henry Leduc, Philip Mauskopf, Ryan McGeehan, Christopher McKenney, Theodore Reck, Joeseph Redford, Colin Ross, Corwin Shiu, Carole Tucker, Jordan Turner, Jonas Zmuidzinas

Proc. SPIE. 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX

KEYWORDS: Spectroscopy, Optical filters, Sensors, Spectroscopes, Resonators, Astronomical imaging, Tin, Galactic astronomy, Spectroscopic atmospheric monitoring techniques

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SuperSpec is a new technology for millimeter and submillimeter spectroscopy. It is an on-chip spectrometer being developed for multi-object, moderate resolution (R = ~300), large bandwidth survey spectroscopy of high-redshift galaxies for the 1 mm atmospheric window. SuperSpec targets the CO ladder in the redshift range of z = 0 to 4, the [CII] 158 um line from z = 5 to 9, and the [NII] 205 um line from z = 4-7. All together these lines offer complete redshift coverage from z = 0 to 9. SuperSpec employs a novel architecture in which detectors are coupled to a series of resonant filters along a single microwave feedline instead of using dispersive optics. This construction allows for the creation of a full spectrometer occupying only 20 cm squared of silicon, a reduction in size of several orders of magnitude when compared to standard grating spectrometers. This small profile enables the production of future multi-object spectroscopic instruments required as the millimeter-wave spectroscopy field matures. SuperSpec uses a lens-coupled antenna to deliver astrophysical radiation to a microstrip transmission line. The radiation then propagates down this transmission line where upon proximity coupled half wavelength microstrip resonators pick off specific frequencies of radiation. Careful tuning of the proximity of the resonators to the feedline dials in the desired resolving power of the SuperSpec filterbank by tuning the coupling quality factor. The half wavelength resonators are then in turn coupled to the inductive meander of kinetic inductance detectors (KIDs), which serve as the power detectors for the SuperSpec filterbank. Each SuperSpec filter bank contains hundreds of titanium nitride TiN KIDs and the natural multiplexibility of these detectors allow for readout of the large numbers of required detectors. The unique coupling scheme employed by SuperSpec allows for the creation of incredibly low volume (2.6 cubic microns), high responsivity, TiN KIDs. Since responsivity is proportional to the inverse of quasiparticle-occupied volume, this allows SuperSpec to reach the low NEPs required by moderate resolution spectroscopy to be photon limited from the best ground-based observing sites. We will present the latest results from SuperSpec devices. In particular, detector NEPs, measured filter bank efficiency (including transmission line losses), and spectral profiles for a full ~ 300-channel filterbank. Finally, we will report on our system end to end efficiency and total system NEP.

Proceedings Article | 9 July 2018 Presentation + Paper

The design and characterization of a 300 channel, optimized full-band millimeter filterbank for science with SuperSpec

J. Redford, J. Wheeler, K. Karkare, S. Hailey-Dunsheath, C. Bradford, E. Shirokoff, P. Barry, G. Che, J. Glenn, H. Leduc, P. Mauskopf, R. McGeehan, T. Reck, J. Zmuidzinas

Proc. SPIE. 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX

KEYWORDS: Resonators, Optical filters, Sensors, Mirrors, Spectroscopy, Galactic astronomy, Telescopes, Antennas, Niobium, Capacitors

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Proceedings Article | 27 July 2016 Paper

SuperSpec: development towards a full-scale filter bank

J. Wheeler, S. Hailey-Dunsheath, E. Shirokoff, P. Barry, C. Bradford, S. Chapman, G. Che, J. Glenn, M. Hollister, A. Kovács, H. LeDuc, P. Mauskopf, R. McGeehan, C. McKenney, R. O’Brient, S. Padin, T. Reck, C. Ross, C. Shiu, C. Tucker, R. Williamson, J. Zmuidzinas

Proc. SPIE. 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII

KEYWORDS: Sensors, Spectroscopy, Spectroscopes, Galactic astronomy, Optical filters, Prototyping, Sensors, Spectroscopy, Optical filters, Technetium, Resonators, Tomography, Ultraviolet radiation

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