Dr. Álvaro González Profile

Dr. Álvaro González

Associate Professor at National Astronomical Observatory of Japan

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Publications (8)

Proceedings Article | 9 July 2018 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

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

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

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Proceedings Article | 9 July 2018 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

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

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

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Proceedings Article | 9 July 2018 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

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

KEYWORDS: Astronomy, Receivers, Radio astronomy

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Proceedings Article | 6 July 2018 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

Proc. SPIE. 10700, Ground-based and Airborne Telescopes VII

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

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Proceedings Article | 10 August 2016 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

Proc. SPIE. 9911, Modeling, Systems Engineering, and Project Management for Astronomy VII

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

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Proceedings Article | 20 July 2016 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

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

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

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Proceedings Article | 19 July 2016 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

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

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

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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

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

Proc. SPIE. 9153, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII

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

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Showing 5 of 8 publications

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