Mr. Marcos Emir Moreno Nolasco Profile

Marcos Emir Moreno Nolasco

at Corporacion Mexicana de Investigacion en Materiales

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Author

Publications (5)

Proceedings Article | 13 December 2020 Paper

The Large Millimeter Telescope (LMT) Alfonso Serrano: current status and telescope performance

David Hughes, F. Peter Schloerb, Itziar Aretxaga, Edgar Castillo-Domínguez, Miguel Chávez Dagostino, Edgar Colín, Neal Erickson, Daniel Ferrusca Rodriguez, David Gale, Arturo Gómez-Ruiz, José Luis Hernández Rebollar, Mark Heyer, James Lowenthal, Alfredo Montaña, Marcos Emir Moreno Nolasco, Gopal Narayanan, Alexandra Pope, Iván Rodríguez-Montoya, David Sánchez-Argüelles, David Smith, Kamal Souccar, Miguel Velázquez de la Rosa Becerra, Grant Wilson, Min Yun

Proceedings Volume 11445, 1144522 (2020) https://doi.org/10.1117/12.2561893

KEYWORDS: Telescopes, Reflectors, Optical instrument design, Receivers, Reflector telescopes, Control systems, Actuators, Heterodyning, Transparency, Spectroscopes

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Proceedings Article | 10 July 2018 Paper

Field testing and performance characterization of the production LMT/GTM active surface actuators

David Smith, Kamal Souccar, Gabriela Montalvo, César Arteaga Magaña, José Luis Hernández Rebollar, Josefina Lázaro Hernández, Marcos Emir Moreno Nolasco, Pierluigi Fumi, Enzo Anaclerio, Daniele Gallieni

Proceedings Volume 10706, 107066Q (2018) https://doi.org/10.1117/12.2311593

KEYWORDS: Actuators, Telescopes, Inspection

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With the completion of the full 50 m primary reflector surface of the Large Millimeter Telescope/Gran Telescopio Milimetrico (LMT/GTM), the project also upgraded the primary surface actuators. These actuators were custom-designed by ADS International in Valmadrera, Italy to meet the accuracy, load, and physical size requirements necessary for robust operation. Specifically, the actuators had to provide precise and repeatable positioning, support both operational and survival loading conditions for even the largest surface segments, and still fit within the geometric constraints imposed by interior angles of the backup structure truss members. Factory and laboratory testing confirmed that the actuators should meet the requirements. As reported in earlier papers, the LMT/GTM site poses particular challenges for electromechanical devices. As expected for a mountaintop site (4,600 m), the low atmospheric density reduces cooling effectiveness for motors and drives. To add to the challenge, the ambient temperature hovers near freezing and there is significant precipitation during the summer. This results in frequent freeze/thaw cycles. The constant formation and either sublimation or melting of ice has been an operational challenge for many devices at the LMT/GTM. Because of the large number of primary surface actuators (720 in total), it is particularly important that these units, their drive control boxes, and their cable connections be able to meet all specifications even under the site conditions. To confirm the suitability of the actuators, the LMT/GTM procured an initial set of sixteen actuators for testing at the site. After laboratory testing, the actuators were installed into the outer two rings of the telescope and cycled from February 2016 through January 2017. This extended testing provided direct operational experience over a wide variety of weather conditions. The program was long enough to provide confidence in the actuator design. With the first article testing complete, the project ordered a production run of the actuators. The installation of these actuators met the telescope completion plan requirement of bringing the LMT/GTM to a 50 m active surface telescope for the 2017-18 scientific observing season. This paper presents the final report on the first article testing program, as well as a summary of the characterized performance of the production actuators prior to installation.

Proceedings Article | 10 July 2018 Paper

Factory characterization testing of a large precision hexapod for the LMT/GTM

David Smith, Kamal Souccar, David Gale, Maribel Lucero Álvarez, Emilio Hernández Rios, Arak Olmos Tapia, Marcos Emir Moreno Nolasco, Matthieu Cuq, Pierre Noire, Romain Pawlowski, Thierry Roux

Proceedings Volume 10706, 1070649 (2018) https://doi.org/10.1117/12.2311674

KEYWORDS: Calibration, Telescopes, Motion measurement, Temperature metrology, Metrology, Control systems, Laser metrology

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Proceedings Article | 6 July 2018 Paper

Tiltmeter evaluation of the LMT/GTM azimuth track following the earthquake of September 2017

David Smith, Kamal Souccar, Marcos Emir Moreno Nolasco

Proceedings Volume 10700, 107002O (2018) https://doi.org/10.1117/12.2311669

KEYWORDS: Telescopes, Earthquakes, Sensors, Data modeling, Mechanical engineering, Inspection

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Proceedings Article | 6 July 2018 Paper

Deformation measurements of the LMT/GTM receiver cabin

David Smith, David Gale, Maribel Lucero Álvarez, Carlos Tzile Torres, Marcos Emir Moreno Nolasco

Proceedings Volume 10700, 107002C (2018) https://doi.org/10.1117/12.2311665

KEYWORDS: Receivers, Mirrors, Telescopes, Motion measurement, Metrology, Laser metrology

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As the LMT/GTM has moved to final completion as a 50 m diameter telescope, the scientific and instrumentation teams have requested information concerning the actual motions between the reinforced M3 platform of the telescope and the receiver cabin floor. To provide some bounding information on these effects, the LMT/GTM engineering and metrology teams developed a test program to measure these effects by means of a laser tracker. Two sets of tests were performed. The first focused on the relative motions between the M3 platform, the M4 mirror, and the receiver cabin floor. The second was directed at measuring the effective stiffness of the floor under load.

In the first tests, a laser tracker was employed to measure groups of targets on the M3 platform, the M4 mirror, and the receiver cabin floor. The baseline distances were then compared continuously for several hours. In this test, the M4, which is supported directly from the M3 platform, was found to be more stable than the receiver cabin floor. In most cases, the errors were consistent with thermal variations in the structure. The most dramatic change was observed near sunset, with position drift rates of about 300 μm/hr. Later at night, the M4 position stabilized, but the receiver cabin still sometimes showed position variations of over 100 μm/hr. These results put a bound on the maximum allowable time between checking the pointing and focus of the telescope.

The second tests measured the stiffness of the receiver cabin floor by measuring the underside of the platform from the floor below while weights were placed at different locations in the testing area of the floor above. As expected, the largest deflections were measured when the load was placed at the center of the floor grating between the mid-span of the smallest floor structure I-beams, with a stiffness of 14 N/μm. The stiffness was about 10% higher (just under 16 N/μm) directly at the smaller I-beams near their mid-span. A more dramatic difference was measured for loads near a main structural cross beam. In that case, targets that connected to the beam itself were found to have a stiffness of nearly 34 N/μm, more than twice the mid-span stiffness. However, in that location, the stiffness for loads in the middle of the floor grating increased only to 17 N/μm, because the flexibility is dominated by the floor grating itself. Comparison of the unloaded condition of the structure after each test showed slow drifts of the relative positions of the platforms, consistent with the thermal drift hypothesis supported by the first tests.

This paper presents the tests and analysis, together with the detailed results of the receiver room motion and floor stiffness.

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