Dr. Wonsik Yoon Profile

Dr. Wonsik Yoon

at NASA Goddard Space Flight Ctr

SPIE Involvement:

Author

Publications (9)

SPIE Journal Paper | 11 June 2019 Open Access

Design of optical/IR blocking filters for the Lynx X-ray Microcalorimeter

Megan E. Eckart, Wonsik Yoon, Benjamin Zeiger, Simon R. Bandler, Dan McCammon

JATIS, Vol. 5, Issue 02, 021020, (June 2019) https://doi.org/10.1117/12.10.1117/1.JATIS.5.2.021020

KEYWORDS: Optical filters, X-rays, Aluminum, X-ray optics, Thin films, Silicon, Waveguides, Digital filtering, Optical design, X-ray telescopes

Read Abstract +

DOWNLOAD PAPER

SPIE Journal Paper | 31 May 2019 Open Access

Lynx x-ray microcalorimeter

Simon Bandler, James Chervenak, Aaron Datesman, Archana Devasia, Michael DiPirro, Kazuhiro Sakai, Stephen Smith, Thomas Stevenson, Wonsik Yoon, Douglas Bennett, Benjamin Mates, Daniel Swetz, Joel Ullom, Kent Irwin, Megan Eckart, Enectali Figueroa-Feliciano, Dan McCammon, Kevin Ryu, Jeffrey Olson, Ben Zeiger

JATIS, Vol. 5, Issue 02, 021017, (May 2019) https://doi.org/10.1117/12.10.1117/1.JATIS.5.2.021017

KEYWORDS: X-rays, Sensors, Field effect transistors, Electronics, Microwave radiation, Staring arrays, Prototyping, Image resolution, Cryocoolers, Superconductors

Read Abstract +

DOWNLOAD PAPER

SPIE Journal Paper | 14 May 2019 Open Access

Lynx x-ray microcalorimeter cryogenic system

Michael DiPirro, Simon Bandler, Xiaoyi Li, Jeffrey Olson, James Tuttle, Wonsik Yoon, Mark Zagarola

JATIS, Vol. 5, Issue 02, 021006, (May 2019) https://doi.org/10.1117/12.10.1117/1.JATIS.5.2.021006

KEYWORDS: Cryocoolers, Cryogenics, X-rays, Magnetism, Staring arrays, Sensors, Reliability, Space operations, Electronics, Mathematical modeling

Read Abstract +

DOWNLOAD PAPER

SPIE Journal Paper | 9 April 2019 Open Access

Magnetic calorimeter option for the Lynx x-ray microcalorimeter

Thomas Stevenson, Manuel Balvin, Simon Bandler, Archana Devasia, Peter Nagler, Kevin Ryu, Stephen Smith, Wonsik Yoon

JATIS, Vol. 5, Issue 02, 021009, (April 2019) https://doi.org/10.1117/12.10.1117/1.JATIS.5.2.021009

KEYWORDS: Sensors, X-rays, Inductance, Magnetic sensors, Niobium, Magnetism, Superconductors, Gold, Prototyping, Microwave radiation

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 10 July 2018 Presentation

The Design of the Lynx x-ray microcalorimeter (LXM) (Conference Presentation)

Simon Bandler, Michael DiPirro, Megan Eckart, Kazuhiro Sakai, Stephen Smith, Wonsik Yoon, Douglas Bennett, Ben J. Mates, Daniel Swetz, Joel Ullom, Kent Irwin, Dan McCammon, Enectali Figueroa-Feliciano, Kevin Ryu, Ben Zeiger, Jeffrey Olson

Proceedings Volume 10699, 1069913 (2018) https://doi.org/10.1117/12.2314079

KEYWORDS: X-rays, Image resolution, X-ray optics, Oxygen, Amplifiers, Cryogenics, X-ray telescopes, Satellites, X-ray imaging, Spectroscopy

Read Abstract +

Lynx is an x-ray telescope that is one of four large satellite mission concepts currently being studied by NASA to be the next flagship mission. One of Lynx’s three instruments is the Lynx X-ray Microcalorimeter (LXM), an imaging spectrometer placed at the focus of an x-ray optic with 0.5 arc-second angular resolution and approximately 2 m2 area at 1 keV. It will be used for a wide variety of observations, and the driving performance requirements are met through different sub-regions of the array. It will provide an energy resolution of better than 3 eV over the energy range of 0.2 to 7 keV, with pixels sizes that vary in scale from 0.5 to 1 arc-seconds in the inner 5 arc-minute field-of-view, and to 5 arc-seconds in the extended 20 arc-minute field-of-view. The Main Array consists mostly of 1 arc-second pixels in the central 5 arc-minutes with less than 3 eV energy resolution (FWHM) in the energy range of 0.2 to 7 keV. It is enhanced in the inner 1 arc-minute region with 0.5 arc-second pixels that will better sample the point spread function of the X-ray optic. The inner 5 arc-minute region is designed specifically for the observations related to cosmic feedback studies, investigating the interactions of AGN with the local regions surrounding them. The 0.5" pixel size allows detailed studies of winds and jets on a finer angular scale. It is also optimized for spatially resolved measurements of cluster cores. The outer regions of the array are designed to operate during a completely different set of observations. The Extended Array will be utilized for surveys over large regions of the sky, the 20 arc-minute field-of-view making it practical to make observations of the soft diffuse emission from larger scale-structure such as extended galaxies, the outer regions of galaxy groups and clusters and also cosmic filaments. This array is optimized for high energy resolution up to 2 keV through the use of thin (0.5 um) gold absorbers. The Ultra-High-Res Array is designed specifically to enable the study turbulent line broadening around individual through the study of the highly ionized oxygen lines. It is optimized for energy resolution for the oxygen VII and VIII lines, with better than 0.4 eV energy resolution. In this paper we present the design of the baseline configuration and the scientific motivation. We discuss the technologies that are being developed for this instrument, in particular the transition-edge sensor (TES) and metallic magnetic calorimeter (MMC) sensor technologies. We place these technologies in the context of the required energy resolution, energy range, pixel size, and count-rate, as well as strategies for the pixel layout and wiring. We will discuss the use of microwave SQUIDs, HEMT amplifiers, and parametric amplifiers for the read-out and the implications for the cryogenic design. We also describe the design of the full instrument, including the strawman cryogenic design, as well as an estimate for the mass, power and data rate.

Proceedings Article | 10 July 2018 Presentation

Transition-edge sensor array development for the ATHENA x-ray itegral field unit (Conference Presentation)

Stephen Smith, Joesph Adams, Simon Bandler, James Chervenak, Megan Eckart, Fred Finkbeiner, Richard Kelley, Caroline Kilbourne, Antoine Miniussi, F. Scott Porter, John Sadleir, Kazuhiro Sakai, Nicholas Wakeham, Edward Wassell, Wonsik Yoon, Hiroki Akamatsu, Luciano Gottardi, Roland den Hartog, Brian Jackson, Jan van der Kuur

Proceedings Volume 10699, 106991L (2018) https://doi.org/10.1117/12.2313428

KEYWORDS: X-rays, Sensors, Transition metals, Observatories, Spectral resolution, Multiplexing, Fused deposition modeling, Telescopes, Metals

Read Abstract +

The X-ray integral field unit (X-IFU) proposed for ESA’s Athena X-ray observatory will consist of 3840 transition edge sensor (TES) microcalorimeters optimized for the energy range of 0.2 to 12 keV. The instrument will provide unprecedented spectral resolution of ~ 2.5 eV at energies of up to 7 keV and will accommodate photon fluxes of 10’s mcrab (1000’s cps). Over the past two years the baseline configuration has evolved from the original proposal. The current baseline consists of a uniform large pixel array (LPA) of 5” pixels, AC-biased within their superconducting-to-normal transition and read out using frequency domain multiplexing (FDM). The baseline pixel design is approximately a factor of two times slower than in the original concept. High count-rate accommodation, needed for bright point source observations, is now achieved by defocusing the telescope optic to spread the photons over a larger number of pixels. In this paper we report on Mo/Au TES designs that are being optimized to meet the baseline pixel parameters and performance goals. This includes detailed studies on the optimization of the thermal heat sink and the impact of different TES geometries (including TES size and normal metal feature geometries) on the DC-biased transition shape. We discuss how these geometric effects ultimately impact important performance metrics such as energy resolution, decay time, slew-rate and array scale uniformity. Our Mo/Au TESs have historically been designed and optimized for DC-biased operation, however, the primary readout technology uses an AC drive to bias the TES. Depending upon the drive frequency, the AC bias affects the TES transition shape in two ways. Firstly, due to losses from the bias current coupling to metallic components in close proximity to the TES and secondly introducing fine structure in the transition due to Josephson effects. We present latest pixel design optimizations targeted at mitigating these frequency dependent effects in order to achieve commensurate performance with that obtained in the DC case.

Proceedings Article | 19 September 2017 Presentation + Paper

Lynx Mission concept status

Jessica Gaskin, Ryan Allured, Simon Bandler, Stefano Basso, Marshall Bautz, Michael Baysinger, Michael Biskach, Tyrone Boswell, Peter Capizzo, Kai-Wing Chan, Marta Civitani, Lester Cohen, Vincenzo Cotroneo, Jacqueline Davis, Casey DeRoo, Michael DiPirro, Alexandra Dominguez, Leo Fabisinski, Abraham Falcone, Enectali Figueroa-Feliciano, Jay Garcia, Karen Gelmis, Ralf Heilmann, Randall Hopkins, Thomas Jackson, Kiranmayee Kilaru, Ralph Kraft, Tianning Liu, Ryan McClelland, Randy McEntaffer, Kevin McCarley, John Mulqueen, Feryal Özel, Giovanni Pareschi, Paul Reid, Raul Riveros, Mitchell Rodriguez, Justin Rowe, Timo Saha, Mark Schattenburg, Andrew Schnell, Daniel Schwartz, Peter Solly, Robert Suggs, Steven Sutherlin, Douglas Swartz, Susan Trolier-McKinstry, James Tutt, Alexey Vikhlinin, Julian Walker, Wonsik Yoon, William Zhang

Proceedings Volume 10397, 103970S (2017) https://doi.org/10.1117/12.2273911

KEYWORDS: X-rays, Astrophysics, Galactic astronomy, Environmental sensing, Stars, Planetary systems, X-ray optics, Observatories

Read Abstract +

Proceedings Article | 20 July 2016 Paper

Transition-edge sensor pixel parameter design of the microcalorimeter array for the x-ray integral field unit on Athena

S. Smith, J. Adams, S. Bandler, G. Betancourt-Martinez, J. Chervenak, M. Chiao, M. Eckart, F. Finkbeiner, R. Kelley, C. Kilbourne, A. Miniussi, F. Porter, J. Sadleir, K. Sakai, N. Wakeham, E. Wassell, W. Yoon, D. Bennett, W. Doriese, J. Fowler, G. Hilton, K. Morgan, C. Pappas, C. Reintsema, D. Swetz, J. Ullom, K. Irwin, H. Akamatsu, L. Gottardi, R. den Hartog, B. Jackson, J. van der Kuur, D. Barret, P. Peille

Proceedings Volume 9905, 99052H (2016) https://doi.org/10.1117/12.2231749

KEYWORDS: X-rays, Sensors, Multiplexing, Sensors, Staring arrays, Cryogenics, Helium, Magnetism, Photons, Temperature metrology, Resistance

Read Abstract +

Proceedings Article | 19 July 2016 Paper

Development of x-ray microcalorimeter imaging spectrometers for the X-ray Surveyor mission concept

Simon Bandler, Joseph Adams, James Chervenak, Aaron Datesman, Megan Eckart, Fred Finkbeiner, Richard Kelley, Caroline Kilbourne, Gabriele Betancourt-Martinez, Antoine Miniussi, Frederick Porter, John Sadleir, Kazuhiro Sakai, Stephen Smith, Thomas Stevenson, Nicholas Wakeham, Edward Wassell, Wonsik Yoon, Dan Becker, Douglas Bennett, William Doriese, Joseph Fowler, Johnathan Gard, Gene Hilton, Benjamin Mates, Kelsey Morgan, Carl Reintsema, Daniel Swetz, Joel Ullom, Saptarshi Chaudhuri, Kent Irwin, Sang-Jun Lee, Alexey Vikhlinin

Proceedings Volume 9905, 99050Q (2016) https://doi.org/10.1117/12.2232156

KEYWORDS: Sensors, X-rays, Tantalum, Superconductors, Computer aided design, Silver, Matrices, Field effect transistors, Electronics, Spectral resolution

Read Abstract +

Showing 5 of 9 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years