Ms. Chriselle G. Galapon Nagata Profile

Chriselle G. Galapon Nagata

at National Solar Observatory

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Author

Publications (5)

Proceedings Article | 29 August 2022 Presentation + Paper

The National Science Foundation’s Daniel K. Inouye Solar Telescope: status and first results

Thomas Rimmele, Mark Warner, Roberto Casini, Jeffery Kuhn, Haosheng Lin, Friedrich Wöger, Alexandra Tritschler, Alisdair Davey, Alfred de Wijn, Andre Fehlmann, David Harrington, Sarah Jaeggli, Thomas Schad, Tetsu Anan, Christian Beck, Heather Marshall, Paul Jeffers, Andrew Beard, David Berst, Eric Cross, Bryan Cummings, Colleen Donneley, Arthur Eigenbrot, Andrew Ferayorni, Christopher Foster, Chriselle Ann Galapon, Bret Goodrich, Brian Gregory, Stephanie Guzman, Stephen Guzzo, John Hubbard, Erik Johansson, Luke Johnson, Mary Liang, Brialyn Onodera, Myles Puentes, Lukas Rimmele, Erik Starman, Stacey Sueoka, Richard Summers, Aimee Szabo, Louis Szabo, Timothy Williams, Charles White

Proceedings Volume 12182, 121820Z (2022) https://doi.org/10.1117/12.2644469

KEYWORDS: Adaptive optics, Solar telescopes, Telescopes, Mirrors, Visible radiation, Solar processes, Magnetism, Sun, Polarization, Polarimetry

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Proceedings Article | 29 August 2022 Poster + Paper

Daniel K. Inouye Solar Telescope's heat stop

N. Chriselle, Lukas Rimmele, Scott Gregory, Paul Jeffers

Proceedings Volume 12184, 121842H (2022) https://doi.org/10.1117/12.2629498

KEYWORDS: Reflectors, Telescopes, Heat flux, Control systems, Thermal analysis, Temperature sensors, Mirrors, Cooling systems, Safety, Solar telescopes

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Proceedings Article | 13 December 2020 Poster

DKIST's Coude environmental system

Chriselle Galapon, Charles White

Proceedings Volume 11445, 1144576 (2020) https://doi.org/10.1117/12.2562640

KEYWORDS: Cameras, Humidity, Control systems, Solar telescopes, Adaptive optics, Telescopes, Wavefront distortions, Optical instrument design, Curtains, Particles

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Proceedings Article | 13 December 2020 Poster + Paper

Developing an install plan for the DKIST carousel cooling system

Brialyn Onodera, James Hoag, Chriselle Galapon Nagata

Proceedings Volume 11445, 1144541 (2020) https://doi.org/10.1117/12.2560893

KEYWORDS: Cooling systems, Solar telescopes, Cladding, Mirrors, Sun, Telescopes, Control systems, Solar radiation, Camera shutters

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Proceedings Article | 9 August 2016 Paper

Cooling a solar telescope enclosure: plate coil thermal analysis

Michael Gorman, Chriselle Galapon, Guillermo Montijo, LeEllen Phelps, Gaizka Murga

Proceedings Volume 9911, 99111U (2016) https://doi.org/10.1117/12.2232160

KEYWORDS: Solar telescopes, Observatories, Telescopes, Thermal analysis, Systems modeling, Solar radiation models, Cooling systems, Data modeling, Solar radiation, MATLAB

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The climate of Haleakalā requires the observatories to actively adapt to changing conditions in order to produce the best possible images. Observatories need to be maintained at a temperature closely matching ambient or the images become blurred and unusable. The Daniel K. Inouye Solar Telescope is a unique telescope as it will be active during the day as opposed to the other night-time stellar observatories. This means that it will not only need to constantly match the ever-changing temperature during the day, but also during the night so as not to sub-cool and affect the view field of other telescopes while they are in use.

To accomplish this task, plate coil heat exchanger panels will be installed on the DKIST enclosure that are designed to keep the temperature at ambient temperature +0°C/-4°C. To verify the feasibility of this and to validate the design models, a test rig has been installed at the summit of Haleakalā. The project’s purpose is to confirm that the plate coil panels are capable of maintaining this temperature throughout all seasons and involved collecting data sets of various variables including pressures, temperatures, coolant flows, solar radiations and wind velocities during typical operating hours. Using MATLAB, a script was written to observe the plate coil’s thermal performance. The plate coil did not perform as expected, achieving a surface temperature that was generally 2ºC above ambient temperature. This isn’t to say that the plate coil does not work, but the small chiller used for the experiment was undersized resulting in coolant pumped through the plate coil that was not supplied at a low enough temperature. Calculated heat depositions were about 23% lower than that used as the basis of the design for the hillers to be used on the full system, a reasonable agreement given the fact that many simplifying assumptions were used in the models. These were not carried over into the testing.

The test rig performance showing a 23% margin provides a high degree of confidence for the performance of the full system when it is installed. If time allows, additional testing could be done that includes additional incident angles and times of day. This would allow a more complete analysis. If additional testing were to be performed, it’s recommended to use a larger chiller capable of reaching lower temperatures. The test rig design could also be optimized in order to bring the plate coil up to its maximum efficiency. In the future, the script could be rewritten in a different computer language, so that the data could be solved for quicker. Further analysis could also include different types of coolants.

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