Caption: UK astronomer Bill Dent works at the Atacama Large Millimeter/submillimeter Array , the world?s highest observatory, based in Chile’s Chajnantor Plateau. Pictures of Bill Dent working in Santiago. Pictures of ALMA taken by Rachael Pells for World Focus feature.
It’s a unique set-up: Alma is an international project and several countries competed to host the observatory, but Chile was selected precisely for this dry and isolated location. Thanks to the altitude, the humidity at Chajnantor typically rests at just five per cent , hypoxia and heart disease. Alma has strict safety rules in place, and each year employees must undertake a medical exam to test things like blood pressure, nutrition, and cardiovascular health.
A group of Alma 12-m antennas observing the night sky – observations in this study were made using the 12-m antennas Those working at the top site must spend the first day of their shift pattern acclimatising at the OSF level, Mr Dent explains. On the second day, they can work above 3,000m for a maximum of three hours, building up to six hours at a time at 5,050m by the end of the week. After one week, they take a break, and it is forbidden to sleep at the high altitude site.
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