Dr. Álvaro González Profile

Dr. Álvaro González

Project Manager at Joint ALMA Observatory

SPIE Involvement:

Author

Publications (15)

Proceedings Article | 2 September 2022 Presentation + Paper

Presentation + Paper

ALMA Band-1 (35-50GHz) receiver: first light, performance, and road to completion

Yau-De Huang, Yuh-Jing Hwang, Chau-Ching Chiong, Hsi-Wei Yen, Patrick Michel Koch, Chi-Den Huang, Bill Liu, Cheng Lin Chen, Jwu Jiun Tsai, Wei-Ling Hsiung, Li-Pin Chi, Chin-Ting Ho, Chao-Chin Wang, Chen Chien, You-Hua Chu, Paul Ho, Francisca Kemper, Oscar Morata, Alvaro Gonzalez, Satoru Iguchi, Yoshi Uzawa, Daisuke Iono, Hiroshi Nagai, John Effland, Kamaljeet Saini, Marian Pospieszalski, Doug Henke, Keith Yeung, Ricardo Finger, Valeria Tapia, Nicolas Reyes, Giorgio Siringo, Gianni Marconi, Rodrigo Cabezas

Proceedings Volume 12190, 121900K (2022) https://doi.org/10.1117/12.2629766

KEYWORDS: Receivers, Optical amplifiers, Radio astronomy, Antennas, Astronomy, Observatories, Cryogenics, Simulation of CCA and DLA aggregates, Roads, Galactic astronomy

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SPIE Journal Paper | 23 June 2022

Digital calibration test results for Atacama Large Millimeter/submillimeter Array band 7+8 sideband separating receiver

Franco Curotto, Ricardo Finger, Takafumi Kojima, Kazunori Uemizu, Álvaro González, Yoshinori Uzawa, Leonardo Bronfman

JATIS, Vol. 8, Issue 02, 024004, (June 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.2.024004

KEYWORDS: Calibration, Receivers, Field programmable gate arrays, Astronomy, Analog electronics, Signal processing, Phase measurement, Double sideband modulation, Dynamical systems, Waveguides

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Optical design of the 1.85-m mm-submm telescope in 210–375 GHz band

Yasumasa Yamasaki, Sho Masui, Masanari Okawa, Koki Yokoyama, Taisei Minami, Shota Ueda, Yutaka Hasegawa, Atsushi Nishimura, Toshikazu Onishi, Hideo Ogawa, Nozomi Okada, Kimihiro Kimura, Alvaro Gonzalez, Takafumi Kojima, Keiko Kaneko, Ryo Sakai

Proceedings Volume 11453, 114534H (2020) https://doi.org/10.1117/12.2561955

KEYWORDS: Optical design, Telescopes, Receivers, Mirrors, Clouds, Reflectors, Antennas, Optical instrument design, Device simulation, Optical simulations

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Development of a wideband waveguide diplexer for simultaneous observation at 210-375 GHz

Sho Masui, Taisei Minami, Masanari Okawa, Yasumasa Yamasaki, Koki Yokoyama, Shota Ueda, Yutaka Hasegawa, Atsushi Nishimura, Toshikazu Onishi, Hideo Ogawa, Takafumi Kojima, Alvaro Gonzalez

Proceedings Volume 11453, 114534F (2020) https://doi.org/10.1117/12.2561355

KEYWORDS: Waveguides, Telescopes, Receivers, Observatories, Clouds, Astronomy, Oscillators, Waveguide modes

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

Wideband technology development to increase the RF and instantaneous bandwidth of ALMA receivers

Takafumi Kojima, Kazunori Uemizu, Hitoshi Kiuchi, Tomonori Tamura, Keiko Kaneko, Ryo Sakai, Akihira Miyachi, Wenlei Shan, Yoshinori Uzawa, Alvaro Gonzalez, Matthias Kroug, Takeshi Sakai

Proceedings Volume 11453, 114530P (2020) https://doi.org/10.1117/12.2561240

KEYWORDS: Receivers, Radio frequency circuits, Astronomy, Observatories, Heterodyning, Waveguides

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Status of the East Asia ALMA development program: Towards the implementation of the ALMA development roadmap

Álvaro González, Takafumi Kojima, Wenlei Shan, Hitoshi Kiuchi, Yoshinori Uzawa, Daisuke Iono, George Kosugi

Proceedings Volume 11445, 1144538 (2020) https://doi.org/10.1117/12.2561603

KEYWORDS: Receivers, Telescopes, Antennas, Spectroscopy, Calibration, Software development, Superconductors, Integrated circuit design, Integrated circuits

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Development of receiver optics for ALMA bands 1 and 2, and possible synergies with ngVLA

Álvaro González, Keiko Kaneko, Ryo Sakai, Takafumi Kojima, Yoshinori Uzawa

Proceedings Volume 11453, 114533S (2020) https://doi.org/10.1117/12.2561595

KEYWORDS: Receivers, Waveguides, Plastic lenses, Additive manufacturing, 3D printing, Astronomy, Observatories, Product engineering, Astronomical imaging, Optical fabrication equipment

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Proceedings Article | 9 July 2018 Paper

Paper

Performance of pre-production band 1 receiver for the Atacama Large Millimeter/submillimeter Array (ALMA)

Yau-De (Ted) Huang, Oscar Morata, Patrick Michel Koch, Ciska Kemper, Yuh-Jing Hwang, Chau-Ching Chiong, Paul T. Ho, You-Hua Chu, Chi-Den Huang, Ching-Tang Liu, Fang-Chia Hsieh, Yen-Hsiang Tseng, Chia-Hsiang Yang, Jinn jy Tsay, Tsu Chang, Chin-Ting Ho, Po-Han Chiang, Chih-Cheng Chang, Shou-Ting Jian, Sung-Po Hsu, Chen Chien, Satoru Iguchi, Shin'ichiro Asayama, Daisuke Iono, Alvaro Gonzalez, John Effland, Kamaljeet Saini, Marian Pospieszalski, Doug Henke, Keith Yeung, Ricardo Finger, Valeria Tapia, Nicolas Reyes

Proceedings Volume 10708, 1070833 (2018) https://doi.org/10.1117/12.2310127

KEYWORDS: Receivers, Radio astronomy, Astronomy

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Proceedings Article | 9 July 2018 Paper

Paper

Technical achievements of the ALMA future receiver development program at the National Astronomical Observatory of Japan

A. Gonzalez, T. Kojima, M. Kroug, W. Shan, S. Asayama, D. Iono, T. Noguchi, S. Iguchi

Proceedings Volume 10708, 1070812 (2018) https://doi.org/10.1117/12.2312969

KEYWORDS: Receivers, Waveguides, Superconductors, Telescopes, Heterodyning, Terahertz radiation, Antennas

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Proceedings Article | 9 July 2018 Paper

Paper

Overview of the East Asia ALMA development program

S. Asayama, A. Gonzalez, H. Kiuchi, T. Kojima, M. Kroug, W. Shan, G. Kosugi, D. Iono, S. Iguchi

Proceedings Volume 10708, 1070837 (2018) https://doi.org/10.1117/12.2313367

KEYWORDS: Receivers, Software development, Terahertz radiation, Spectroscopy, Observatories, Astronomy, Telescopes, Calibration, Data archive systems, Antennas

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Proceedings Article | 6 July 2018 Paper

Paper

How do we design the interferometric system focused on the analog and digital backend and the correlator for scientifically valuable ALMA developments?

S. Iguchi, A. Gonzalez, T. Kojima, W. Shan, G. Kosugi, S. Asayama, D. Iono

Proceedings Volume 10700, 107002Y (2018) https://doi.org/10.1117/12.2312024

KEYWORDS: Data transmission, Analog electronics, Receivers, Interferometry, Antennas, Astronomy, Telescopes

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Proceedings Article | 10 August 2016 Paper

Paper

The Atacama Large Millimeter/sub-millimeter Array band-1 receiver

Yau De (Ted) Huang, Oscar Morata, Patrick Michel Koch, Ciska Kemper, Yuh-Jing Hwang, Chau-Ching Chiong, Paul Ho, You-Hua Chu, Chi-Den Huang, Ching-Tang Liu, Fang-Chia Hsieh, Yen-Hsiang Tseng, Shou-Hsien Weng, Chin-Ting Ho, Po-Han Chiang, Hsiao-Ling Wu, Chih-Cheng Chang, Shou-Ting Jian, Chien-Feng Lee, Yi-Wei Lee, Satoru Iguchi, Shin'ichiro Asayama, Daisuke Iono, Alvaro Gonzalez, John Effland, Kamaljeet Saini, Marian Pospieszalski, Doug Henke, Keith Yeung, Ricardo Finger, Valeria Tapia, Nicolas Reyes

Proceedings Volume 9911, 99111V (2016) https://doi.org/10.1117/12.2232193

KEYWORDS: Receivers, Optical amplifiers, Radio astronomy, Prototyping, Astronomy, Galactic astronomy, Optical isolators, Cryogenics, Observatories, Carbon monoxide

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Proceedings Article | 20 July 2016 Paper

Paper

An ultra-broadband optical system for ALMA Band 2+3

V. Tapia, R. Nesti, A. González, I. Barrueto, F. Mena, N. Reyes, F. Villa, F. Cuttaia, P. Yagoubov

Proceedings Volume 9914, 99142X (2016) https://doi.org/10.1117/12.2233143

KEYWORDS: Receivers, Radio optics, Optical amplifiers, Astronomy, Field effect transistors, Antennas, Receivers, Polarization, Prototyping, Near field, Attenuators

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Proceedings Article | 19 July 2016 Paper

Paper

Band-1 receiver front-end cartridges for Atacama Large Millimeter/submillimeter Array (ALMA): design and development toward production

Yuh-Jing Hwang, Chau-Ching Chiong, Yau-De Huang, Chi-Den Huang, Ching-Tang Liu, Yue-Fang Kuo, Shou-Hsien Weng, Chin-Ting Ho, Po-Han Chiang, Hsiao-Ling Wu, Chih-Cheng Chang, Shou-Ting Jian, Chien-Feng Lee, Yi-Wei Lee, Marian Pospieszalski, Doug Henke, Ricardo Finger, Valeria Tapia, Alvaro Gonzalez

Proceedings Volume 9914, 99141X (2016) https://doi.org/10.1117/12.2231547

KEYWORDS: Receivers, Prototyping, Amplifiers, Antennas, Waveguides, Optical amplifiers, Optical isolators, Optical filters, Polarization, Optical design

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The ALMA Band-1 receiver front-end prototype cold and warm cartridge assemblies, including the system and key components for ALMA Band-1 receivers have been developed and two sets of prototype cartridge were fully tested. The measured aperture efficiency for the cold receiver is above the 80% specification except for a few frequency points. Based on the cryogenically cooled broadband low-noise amplifiers provided by NRAO, the receiver noise temperature can be as low as 15 – 32K for pol-0 and 17 – 30K for pol-1. Other key testing items are also measured. The receiver beam pattern is measured, the results is well fit to the simulation and design. The pointing error extracted from the measured beam pattern indicates the error is 0.1 degree along azimuth and 0.15 degree along elevation, which is well fit to the specification (smaller than 0.4 degree). The equivalent hot load temperature for 5% gain compression is 492 - 4583K, which well fit to the specification of 5% with 373K input thermal load. The image band suppression is higher than 30 dB typically and the worst case is higher than 20 dB for 34GHz RF signal and 38GHz LO signal, which is all higher than 7 dB required specification. The cross talk between orthogonal polarization is smaller than -85 dB based on present prototype LO. The amplitude stability is below 2.0 x 10-7 , which is fit to the specification of 4.0 x 10-7 for timescales in the range of 0.05 s ≤ T ≤ 100 s. The signal path phase stability measured is smaller than 5 fs, which is smaller than 22 fs for Long term (delay drift) 20 s ≤ T < 300 sec. The IF output phase variation is smaller than 3.5° rms typically, and the specification is less than 4.5° rms. The measured IF output power level is -28 to -30.5 dBm with 300K input load. The measured IF output power flatness is less than 5.6 dB for 2GHz window, and 1.3dB for 31MHz window. The first batch of prototype cartridges will be installed on site for further commissioning on July of 2017.

Proceedings Article | 23 July 2014 Paper

Paper

ALMA band 10 (787-950 GHz): summary of the production of 73 receivers and first light results

Alvaro Gonzalez, Yasunori Fujii, Keiko Kaneko, Matthias Kroug, Takafumi Kojima, Koichi Kuroiwa, Akihira Miyachi, Kazumasa Makise, Zhen Wang, Shin'ichiro Asayama, Yoshinori Uzawa

Proceedings Volume 9153, 91530N (2014) https://doi.org/10.1117/12.2055598

KEYWORDS: Receivers, Polarization, Tolerancing, Astronomy, Antennas, Mirrors, Optical testing, Terahertz radiation, Superconductors, Niobium

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Showing 5 of 15 publications

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