Mr. Matthew Wung Profile

Matthew Wung

at Subaru Telescope, NAOJ

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Author

Publications (9)

Proceedings Article | 27 August 2024 Poster + Paper

Subaru laser guide star system upgrade and on-sky characterization

Yosuke Minowa, Yoshito Ono, Yoshiyuki Doi, Yoko Tanaka, Takamasa Bando, Hiroshige Yoshida, Koki Terao, Hirofumi Okita, Matthew Wung, Lucio Ramos, Hajime Ogane, Akimasa Ojika, Masayuki Akiyama

Proceedings Volume 13097, 1309735 (2024) https://doi.org/10.1117/12.3018789

KEYWORDS: Laser guide stars, Telescopes, Laser systems engineering, Relays, Wavefront sensors, Mirrors, Camera shutters, Control systems, Adaptive optics, Stars

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Proceedings Article | 15 August 2024 Presentation + Paper

Prime Focus Spectrograph (PFS) for Subaru Telescope: progressing final steps to science operation

Naoyuki Tamura, Kiyoto Yabe, Shintaro Koshida, Yuki Moritani, Masayuki Tanaka, Miho Ishigaki, Yuki Ishizuka, Yukiko Kamata, Ali Allaoui, Akira Arai, Stéphane Arnouts, Rudy Barette, Robert Barkhouser, Eddie Bergeron, Patrick Blanchard, Neven Caplar, Michael Carle, Pierre-Yves Chabaud, Yin-Chang Chang, Hsin-Yo Chen, Richard C. Chou, Judith Cohen, Ricardo Costa, Thibaut Crauchet, Rodorigo de Almeida, Antonio de Oliveira, Ligia de Oliveira, Kjetil Dohlen, Leandro dos Santos, László Dobos, Richard Ellis, Steve Ertel, Maximilian Fabricius, Décio Ferreira, Hisanori Furusawa, Wilfred Gee, Javier Garciá-Carpio, Roman Gerasimov, Mirek Golebiowski, Aidan Gray, James Gunn, ChangHoon Hahn, Satoshi Hamano, Randolph Hammond, Albert Harding, Takashi Hattori, Kota Hayashi, Wanqiu He, Timothy Heckman, Stephen Hope, Shu-Fu Hsu, Pin-Jie Huang, Marc Jaquet, Eric Jeschke, Christian Jespersen, Yipeng Jing, Russell Kackley, Jennifer Karr, Satoshi Kawanomoto, Masahiko Kimura, Evan Kirby, Michitaro Koike, Eiichiro Komatsu, Yusei Koyama, Vincent Le Brun, Arnaud Le Fur, David Le Mignant, Gerald Lemson, Yen-Ting Lin, Hung-Hsu Ling, Craig Loomis, Robert Lupton, Fabrice Madec, Danilo Marchesini, Lucas Marrara, Dmitry Medvedev, Sogo Mineo, Arik Mitschang, Satoshi Miyazaki, Kumiko Morihana, Takahiro Morishima, Hitoshi Murayama, Graham Murray, Sakurako Okamoto, Hirofumi Okita, Masato Onodera, Vera Passegger, Joshua Peebles, Paul Price, Tae-Soo Pyo, Lucio Ramos, Daniel Reiley, Martin Reinecke, Mitsuko Roberts, Josemar Rosa, Julien Rousselle, Kody Rubio, Kiaina Schubert, Michael Seiffert, Jared Siegel, Stephen Smee, Laerte Sodré, Michael Strauss, Tomomi Sunayama, Christian Surace, Masahiro Takada, Yuhei Takagi, Ichi Tanaka, Yoko Tanaka, Aniruddha Thakar, Didier Vibert, Shiang-Yu Wang, Chih-Yi Wen, Suzanne Werner, Matthew Wung, Chi-Hung Yan, Naoki Yasuda, Hiroshige Yoshida

Proceedings Volume 13096, 1309605 (2024) https://doi.org/10.1117/12.3015967

KEYWORDS: Telescopes, Equipment, Engineering, Cameras, Calibration, Observatories, Stars, Near infrared, Observational astronomy, Spectrographs

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The instrumentation of the Prime Focus Spectrograph (PFS), a next generation facility instrument on the Subaru telescope, is now in the final phase of its commissioning process and its general, open-use operations for sciences will provisionally start in 2025. The instrument enables simultaneous spectroscopy with 2386 individual fibers distributed over a very wide (∼1.3 degrees in diameter) field of view on the Subaru’s prime focus. The spectra cover a wide range of wavelengths from 380nm to 1260nm in one exposure in the Low-Resolution (LR) mode (while the visible red channel has the Medium-Resolution (MR) mode as well that covers 710−885nm). The system integration activities at the observatory on Maunakea in Hawaii have been continuing since the arrival of the Metrology Camera System in 2018. On-sky engineering tests and observations have also been carried out continually since September 2021 and, despite various difficulties in interlacing commissioning processes with development activities on the schedule and addressing some major issues on hardware and software, the team successfully observed many targeted stars as intended over the entire field of view (Engineering First Light) in September 2022. Then in parallel to the arrival, integration and commissioning of more hardware components, validations and optimizations of the performance and operation of the instrument are ongoing. The accuracy of the fiber positioning process and the speed of the fiber reconfiguration process have been recently confirmed to be ∼ 20−30μm for 95% of allocated fibers, and ∼130 seconds, respectively. While precise quantitative analyses are still in progress, the measured throughput has been confirmed to be consistent with the model where the information from various sub-components and sub-assemblies is integrated. Long integration of relatively faint objects are being taken to validate an expected increase of signal-to-noise ratio as more exposures are taken and co-added without any serious systematic errors from, e.g., sky subtraction process. The PFS science operation will be carried out in a queue mode by default and various developments, implementations and validations have been underway accordingly in parallel to the instrument commissioning activities. Meetings and sessions are arranged continually with the communities of potential PFS users on multiple scales, and discussions are iterated for mutual understanding and possible optimization of the rules and procedures over a wide range of processes such as proposal submission, observation planning, data acquisition and data delivery. The end-to-end processes of queue observations including successive exposures with updated plans based on assessed qualities of the data from past observations are being tested during engineering observations, and further optimizations are being undertaken. In this contribution, a top-level summary of these achievements and ongoing progresses and future perspectives will be provided.

Proceedings Article | 18 July 2024 Poster + Paper

Prime Focus Spectrograph (PFS) for Subaru Telescope: performance verification of the science-grade fiber optics cable

Shintaro Koshida, Yuki Moritani, Julien Rousselle, Matthew Wung, Hirofumi Okita, Ligia Souza de Oliveira, Décio Ferreira, Antonio Cesar de Oliveira, Graham Murray, Naoyuki Tamura

Proceedings Volume 13096, 130962O (2024) https://doi.org/10.1117/12.3019412

KEYWORDS: Telescopes, Connectors, Transmittance, Spectrographs, Fiber science, Fiber optics, Air temperature, Light sources, Light emitting diodes, Signal intensity

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We present the results of optical performance verification for the Prime Focus Spectrograph (PFS) fiber optics module, so-called “CableBs”, at Subaru Telescope. PFS is the next generation ultra-wide field multi object spectrograph. It employs 2386 fibers of which the fiber tips are placed precisely on the primary focal plane over a field of view of 1.3 degrees in diameter. CableB transfers light from the fiber positioning module, or Prime Focus Instrument, to the spectrographs. PFS utilizes four CableBs and each of them carries just over 600 science grade fibers. We completed installation of all CableBs at the telescope in June 2023 after two-years of intermittent work. The optical performance of each CableB was subsequently assessed, focusing on four areas; continuity, uniformity, throughput, and focal ratio degradation (FRD). For examining continuity, we illuminated one termination of CableB with flat LED panel and observed the transmitted light. We found only one fiber newly broken during shipment from the integration site. We also checked uniformity of the relative intensity of light propagating in each fiber. The whole variations around the average intensities fit in 20% range among fibers in each CableB, which was consistent with the measurement before shipping. Throughput of sampled fibers were measured in a wavelength range from 400 to 1400 nm with commercial spectrometers. The measurement at the telescope and the integration site each showed a throughput of approximately 70%, so both sets of measurements are consistent. Finally, we measured FRD employing the collimated beam method to ensure that CableBs were free from any significant physical stress after the installation. Our FRD measurements were comparable before and after the installation. In addition, a long-term monitoring of over a few months showed FRD remained sufficiently stable for science operations. According to these results, we conclude that the installation of CableBs at Subaru Telescope was successful.

Proceedings Article | 18 July 2024 Poster + Paper

Prime Focus Spectrograph (PFS) for Subaru Telescope: integration and test of the last spectrograph modules

Julien Rousselle, Yuki Moritani, Fabrice Madec, Patrick Blanchard, David Le Mignant, Michael Carle, Thibaut Crauchet, Rudy Barette, Shintaro Koshida, Matthew Wung, Kumiko Morihana, Arnaud Le Fur, Craig Loomis, Naoyuki Tamura

Proceedings Volume 13096, 130962L (2024) https://doi.org/10.1117/12.3020408

KEYWORDS: System integration, Temperature control, Cameras, Spectrographs, Near infrared, Telescopes, Vacuum

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Proceedings Article | 29 August 2022 Presentation + Paper

Prime Focus Spectrograph (PFS) for the Subaru Telescope: its start of the last development phase

Naoyuki Tamura, Yuki Moritani, Kiyoto Yabe, Yuki Ishizuka, Yukiko Kamata, Ali Allaoui, Akira Arai, Stéphane Arnouts, Robert Barkhouser, Rudy Barette, Patrick Blanchard, Eddie Bergeron, Neven Caplar, Pierre-Yves Chabaud, Yin-Chang Chang, Hsin-Yo Chen, Chueh-Yi Chou, You-Hua Chu, Judith Cohen, Richardo da Costa, Thibaut Crauchet, Rodrigo de Almeida, Antonio de Oliveira, Ligia de Oliveira, Kjetil Dohlen, Leandro dos Santos, Richard Ellis, Maximilian Fabricius, Décio Ferreira, Hisanori Furusawa, Jahmour Givans, Javier Garciá-Carpio, Mirek Golebiowski, Aidan Gray, James Gunn, Satoshi Hamano, Randolph Hammond, Albert Harding, Kota Hayashi, Wanqiu He, Timothy Heckman, Stephen Hope, Shu-Fu Hsu, Yen-Shan Hu, Pin Jie Huang, Miho Ishigaki, Eric Jeschke, Yipeng Jing, Erin Kado-Fong, Jennifer Karr, Satoshi Kawanomoto, Masahiko Kimura, Michitaro Koike, Eiichiro Komatsu, Shintaro Koshida, Vincent Le Brun, Arnaud Le Fur, David Le Mignant, Romain Lhoussaine, Yen-Ting Lin, Hung-Hsu Ling, Craig Loomis, Robert Lupton, Fabrice Madec, Danilo Marchesini, Edouard Marguerite, Lucas Marrara, Dmitry Medvedev, Sogo Mineo, Satoshi Miyazaki, Takahiro Morishima, Kazumi Murata, Hitoshi Murayama, Graham Murray, Hirofumi Okita, Masato Onodera, Joshua Peebles, Paul Price, Tae-Soo Pyo, Lucio Ramos, Daniel Reiley, Martin Reinecke, Mitsuko Roberts, Josimar Rosa, Julien Rousselle, Mira Sarkis, Michael Seiffert, Kiaina Schubert, Hassan Siddiqui, Stephen Smee, Laerte Sodré, Michael Strauss, Christian Surace, Manuchehr Taghizadeh Popp, Philip Tait, Masahiro Takada, Yuhei Takagi, Masayuki Tanaka, Yoko Tanaka, Aniruddha Thakar, Didier Vibert, Shiang-Yu Wang, Chih-Yi Wen, Suzanne Werner, Matthew Wung, Gerald Lemson, Arik Mitschang, Naoki Yasuda, Hiroshige Yoshida, Chi-Hung Yan, Michitoshi Yoshida, Takuji Yamashita

Proceedings Volume 12184, 1218410 (2022) https://doi.org/10.1117/12.2628152

KEYWORDS: Telescopes, Cameras, Spectrographs, Optical fibers, Observatories, Sensors, Astronomy, Software development, Near infrared, Connectors

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Proceedings Article | 10 March 2021 Presentation + Paper

Prime Focus Spectrograph (PFS) for the Subaru telescope: a next-generation facility instrument of the Subaru telescope has started coming

Naoyuki Tamura, Naruhisa Takato, Yuki Moritani, Kiyoto Yabe, Yuki Ishizuka, Yukiko Kamata, Ali Allaoui, Stéphane Arnouts, Robert Barkhouser, Philippe Balard, Rudy Barette, Mohamed Belhadi, Jill Burnham, Neven Caplar, Michael Carr, Pierre-Yves Chabaud, Yin-Chang Chang, Hsin-Yo Chen, Richard Chou, You-Hua Chu, Judith Cohen, Ricardo Costa, Thibaut Crauchet, Rodrigo de Almeida, Antonio de Oliveira, Ligia de Oliveira, Kjetil Dohlen, Leandro dos Santos, Richard Ellis, Maximilian Fabricius, Décio Ferreira, Hisanori Furusawa, Javier Garcia-Carpio, Mirek Golebiowski, Aidan Gray, James Gunn, Albert Harding, Randolph Hammond, Murdock Hart, Timothy Heckman, Stephen Hope, Shu-Fu Hsu, Yen-Sang Hu, Pin-Jie Huang, Marc Jaquet, Eric Jeschke, Yipeng Jing, Erin Kado-Fong, Jennifer Karr, Satoshi Kawanomoto, Masahiko Kimura, Michitaro Koike, Eiichiro Komatsu, Shintaro Koshida, Vincent Le Brun, Olivier Le Fèvre, Arnaud Le Fur, David Le Mignant, Hung-Hsu Ling, Craig Loomis, Robert Lupton, Fabrice Madec, Danilo Marchesini, Edouard Marguerite, Lucas Marrara, Dmitry Medvedev, Sogo Mineo, Hitoshi Murayama, Graham Murray, Youichi Ohyama, Hirofumi Okita, Yuki Okura, Masato Onodera, Joseph Orndorff, Sandrine Pascal, Joshua Peebles, Lucio Ramos, Daniel Reiley, Martin Reinecke, Mitsuko Roberts, Josimar Rosa, Julien Rousselle, Mira Sarkis, Alain Schmitt, Michael Seiffert, Kiaina Schubert, Hassan Siddiqui, Stephen Smee, Laerte Sodré, Michael Strauss, Christian Surace, Manuchehr Taghizadeh-Popp, Philip Tait, Masahiro Takada, Satoshi Takita, Tomonori Tamura, Masayuki Tanaka, Yoko Tanaka, Aniruddha Thakar, Didier Vibert, Shiang-Yu Wang, Chih-Yi Wen, Suzanne Werner, Matthew Wung, Yoshihiko Yamada, Takuji Yamashita, Chi-Hung Yan, Naoki Yasuda, Hiroshige Yoshida, Michitoshi Yoshida

Proceedings Volume 11447, 1144713 (2021) https://doi.org/10.1117/12.2562206

KEYWORDS: Spectrographs, Telescopes, Cameras, Imaging systems, Multiplexing, Optical fibers, Hardware testing, Metrology, Observatories, Visible radiation

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Proceedings Article | 12 July 2018 Paper

Current status of the laser guide star upgrade at Subaru Telescope

Etsuko Mieda, Yoko Tanaka, Matthew Wung, Yosuke Minowa, Christophe Clergeon, Yoshito Ono, Takashi Hattori, Yutaka Hayano, Masayuki Akiyama, Francois Rigaut, Celine d'Orgeville

Proceedings Volume 10703, 107033P (2018) https://doi.org/10.1117/12.2314093

KEYWORDS: Telescopes, Adaptive optics, Laser guide stars, Fiber lasers, Laser applications, Lasers

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Proceedings Article | 9 August 2016 Paper

The nuMOIRCS project: detector upgrade overview and early commissioning results

Josh Walawender, Matthew Wung, Maximilian Fabricius, Ichi Tanaka, Nobuo Arimoto, David Cook, Brian Elms, Yasuhito Hashiba, Yen-Sang Hu, Ikuru Iwata, Tetsuo Nishimura, Koji Omata, Naruhisa Takato, Shiang-Yu Wang, Mark Weber

Proceedings Volume 9908, 99082G (2016) https://doi.org/10.1117/12.2231812

KEYWORDS: Sensors, Control systems, Telescopes, Cryogenics, Electronics, Computing systems, Human-machine interfaces, Power supplies, Imaging systems, Interfaces

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Proceedings Article | 9 August 2016 Paper

Detector upgrade of Subaru's Multi-object Infrared Camera and Spectrograph (MOIRCS)

Maximilian Fabricius, Joshua Walawender, Nobuo Arimoto, David Cook, Brian Elms, Yasuhito Hashiba, Takashi Hattori, Yen-Sang Hu, Ikuru Iwata, Tetsuo Nishimura, Koji Omata, Philip Tait, Naruhisa Takato, Ichi Tanaka, Shiang-Yu Wang, Mark Weber, Matthew Wung

Proceedings Volume 9908, 990828 (2016) https://doi.org/10.1117/12.2231417

KEYWORDS: Sensors, Astronomical imaging, Infrared sensors, Spectrographs, Infrared cameras, Electronics, Cryogenics, Sensors, Infrared sensors, Astronomical imaging, Coating, Molybdenum, Optical benches

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