Computer Science – Performance
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5489..986g&link_type=abstract
Ground-based Telescopes. Edited by Oschmann, Jacobus M., Jr. Proceedings of the SPIE, Volume 5489, pp. 986-996 (2004).
Computer Science
Performance
Scientific paper
In 2002 the method of thermal control within the HET enclosure was dramatically changed by the installation of 300 square meters of ventilated area to the stationary walls below the rotating dome. During the month of July 2003 a nightly study of the airflow was undertaken at the HET. While dome seeing has shown substantial improvement, this study revealed a number of counter intuitive flow modes which indicate that additional seeing improvements can be achieved by selective ventilation of the HET dome above the ring-wall. Additional study of dome seeing revealed substantial sub-cooling of the dome skin. Measurements of the skin temperature of the un-insulated dome revealed night-time cooling of local ambient air by as much as 3.6° C. An investigation of coating alternatives resulted in the application of aluminum foil tape, which reduced the temperature drop to 0.3° C. Presently, the performance of the HET (as low as EE50=0.8 arc-seconds) is not thought to be limited by dome seeing.
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