Dr. Yijung Kang Profile

Dr. Yijung Kang

at SLAC National Accelerator Lab

SPIE Involvement:

Author

Publications (4)

Proceedings Article | 11 September 2024 Presentation + Paper

Rubin Observatory Simonyi Survey Telescope integrated mount performance

Brian Stalder, Freddy Munoz, Christian Aguilar, Claudio Araya, Karla Aubel, Jeffrey Barr, Anthony Borstad, Charles Claver, Andy Clements, Julio Constanzo, Giovanni Corvetto, Eric Coughlin, Felipe Daruich, Erik Dennihy, Holger Drass, Johnny Esteves, Juan Fábrega, Kevin Fanning, Peter Ferguson, Manuelangel Garcia Fernandez, Miguel Fernandez, Pelayo Fernandez Lobon, Merlin Fisher-Levine, Samuel Bellver Gamundi, Julen Garcia, Ivan Gonzalez, Ronald Harris, Hernan Herrera, Joshua Hoblitt, Alberto Izpizua, David Jimenez Mejias, Brian Johnson, Yijung Kang, Kshitija Kelkar, Craig Lage, Juan Lopez Toro, Guido Maulen, David Mills, Neill Mills, Doug Neill, Oscar Nunez, Ian Ordenes, Juan Orellana, HyeYun Park, Bruno Quint, Kevin Reil, Heinrich Reinking, Michael Reuter, Tiago Ribeiro, Rodrigo Rojas, Sandra Romero, Francisco Manuel Romero Casas, David Sanmartim, Clare Saunders, Bill Schoening, Jacques Sebag, Eduardo Serrano, Adrian Shestakov, Alysha Shugart, Christian Silva, Kevin Siruno, Ioana Sotuela, Anthony Tache, Diego Tapia, Sandrine Thomas, Roberto Tighe, Te-Wei Tsai, Elana Urbach, Luis Vergara, Christopher Walter

Proceedings Volume 13094, 1309409 (2024) https://doi.org/10.1117/12.3019266

KEYWORDS: Telescopes, Mirrors, Observatories

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Proceedings Article | 11 September 2024 Presentation + Paper

The Vera C. Rubin's M2 support system integration and verification at the TMA

Gabriele Rodeghiero, Luca Rosignoli, Rodolfo Canestrari, Enrico Giro, Pablo Zorzi, Te-Wei Tsai, Holger Drass, Yijung Kang, Roberto Tighe, Doug Neil, Franco Colleoni, Felipe Daruich, Mostafa Lutfi, Guillem Megias Homar, Bruno Quint, Tiago Ribeiro, Austin Roberts, Jacques Sebag, Brian Stalder, Kevin Siruno, Malhar Sonaniskar, Kevin Fanning, Peter Ferguson, Petr Kubánek, Sandrine Thomas, Chuck Claver, Andy Clemens, Kevin Reil, Freddy Muñoz Arancibia, John Andrew, Ian Ordenez Jimenez, Robinson Godoy, Mario Rivera, HyeYun Park, David Sanmartim, Paulina Venegas, Karla Aubel, Alysha Shugart, Massimo Brescia, David Cabrera, David Jimenez, Carlos Morales, Angelo Fausti, Chuck Gessner, Russel Owen

Proceedings Volume 13094, 130942D (2024) https://doi.org/10.1117/12.3019210

KEYWORDS: Actuators, Mirrors, Telescopes, Glasses, Safety, Observatories, Control systems, Baffles, Cameras, Interfaces

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The M2 secondary mirror of the Vera C. Rubin Observatory, scheduled to be commissioned on-sky in 2024, will be the first active secondary mirror of 3.5m diameter in operation. Its substantial dimensions and advanced functionalities place it in league with the secondary mirrors of the upcoming 30m class telescopes. Characterizing its performance serves as a critical step towards comprehending and controlling the optics of the next generation of Extremely Large Telescopes (ELTs). This study focuses on testing and validating the M2 cell in the Observatory’s integration hall and at the Telescope Mount Assembly (TMA). We also report on the integration steps of the M2 cell onto the TMA itself, including installing the light baffle. During the testing campaign, the M2 cell is equipped with an aluminum mirror surrogate for safety reasons regarding the glass mirror. To ensure integrity when the thin glass mirror (10cm) is installed onto the telescope, the M2 support system must be actively controlled during any M2 cell movement. This prompted the development of a dedicated control system to enable closed loop mode for transporting the M2 cell with the glass mirror from the integration hall to the telescope. The tests in the integration hall were conducted with the M2 cell mounted on a rotating cart, allowing different orientations with respect to gravity as it will experience on the telescope. Upon reaching the telescope, static and dynamic tests are conducted at progressively higher telescope performance, increasing slewing speed, acceleration, and jerk. A significant novelty introduced by Rubin to astronomical instrumentation is the Verification & Validation architecture as part of the model-based Systems Engineering approach where requirements, test procedures and executions are merged into an interlaced and dynamic flow. This report presents the experimental results from the distinct test campaigns covering a wide range of M2 cell functionalities. These include characterization of actuator behavior in terms of maximum stroke and force limits, evaluation of closed-loop (active) and open-loop (passive) support system operation for the M2, system settling time and Force Balance response to different slewing speeds of the telescope.

Proceedings Article | 11 September 2024 Poster + Paper

Rubin Observatory primary tertiary mirror cell assembly: final integration and commissioning

Felipe Daruich, Christian Aguilar, John Andrew, Claudio Araya, Karla Aubel, Dominique Boutigny, Erich Bugueno, Andy Clements, Franco Colleoni, Ken Daugherty, Peter Ferguson, Miguel Fernández, Manuel García, Robinson Godoy, Ron Harris, Andrea Jeremie, Brian Johnson, Yijung Kang, Petr Kubanek, Juan Lopez, Robert Lopez, Douglas Neill, Freddy Munoz, Ian Ordenes, HyeYun Park, Eddie Pineiro, Bruno Quint, Mario Rascon, Tom Reeve, Tiago Ribeiro, Mario Rivera, Felipe Rodrigues, Rodrigo Rojas, David Sanmartim, Jacques Sebag, Troy Shannon, Malhar Sonaniskar, Ioana Sotuela, Brian Stalder, Roberto Tighe, Sandrine Thomas, Jeff Urban, Tomislav Vucina, Stuart Weinberger, David Zeller

Proceedings Volume 13094, 1309451 (2024) https://doi.org/10.1117/12.3036881

KEYWORDS: Mirrors, Control systems, Glasses, Actuators, Telescopes, Coating, Observatories, Nozzles, Temperature control, Sensors

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Proceedings Article | 11 September 2024 Presentation + Paper

Rubin M1M3 support system dynamic performance

Bruno Quint, Felipe Daruich, Petr Kubánek, Douglas Neill, Guillem Megias, Adrian Shestakov, Alysha Shugart, Andrea Jeremie, Benjamin Levine, Brian Stalder, Craig Lage, David Sanmartim, Dominique Boutigny, Elana Urbach, Erik Dennihy, Freddy Muñoz Arancibia, Holger Drass, HyeYun Park, Ignacio Sevilla-Noarbe, Ioana Sotuela, Jacques Sebag, Joaquín Hernández, Jeffrey Carlin, Karla Aubel, Kevin Fanning, Kevin Reil, Laura Toribio San Cipriano, Merlin Fisher-Levine, Peter Ferguson, Roberto Tighe, Sandrine Thomas, Tiago Ribeiro, Yijung Kang

Proceedings Volume 13094, 1309429 (2024) https://doi.org/10.1117/12.3019268

KEYWORDS: Mirrors, Telescopes, Actuators, Safety, Glasses, Accelerometers, Observatories, Control systems, Dynamical systems

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