The XENON1T is shielded from ambient radioactivity by a large water tank that is equipped as a muon veto. The tank has a diameter of 10 meters and is 10 meters high. It is constructed from top to bottom and went up in the Gran Sasso underground laboratory within less than a month:
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- Construction of the XENON1T water tank: The floor in Hall B is prepared with self-leveling concrete. Image: Roberto Corrieri/XENON.
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- Construction of the XENON1T water tank: The roof of the tank is built first. Image: Roberto Corrieri/XENON.
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- Construction of the XENON1T water tank: The safety rail and stiffeners on top of the water tank are welded in place. Image: Roberto Corrieri/XENON.
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- Construction of the XENON1T water tank: The first ring is welded below the roof. Image: Roberto Corrieri/XENON.
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- Construction of the XENON1T water tank: As the large crane lifts the roof up, the second ring is welded on. Image: Roberto Corrieri/XENON.
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- Construction of the XENON1T water tank: Ways to go… Ring 3 is welded. Image: Roberto Corrieri/XENON.
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- Construction of the XENON1T water tank: Ring 4… Due to its corrosion resistance and its low radioactivity, the whole tank is made from specially selected stainless steel. Image: Roberto Corrieri/XENON.
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- Construction of the XENON1T water tank: The last ring is welded on. Image: Roberto Corrieri/XENON.
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- Construction of the XENON1T water tank: After welding the shell to the floor, the water tank is completed. Image: Roberto Corrieri/XENON.