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Super-Kamiokande Refurbishment 2018

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The pictures of Super-Kamiokande refurbish work is updated.

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Photos

1. The 2.8m x 4.2m heavy stainless steel cover was replaced with a tentative lighter cover using a crane before the refurbishment work began.

2. When the cover is taken off, the white reflection sheet can be seen. The water is just beneath the sheet. People enter the tank from this opening.

3. May 31st, 2018, the data collection of Super-Kamiokande was stopped for the refurbishment work.

4. A Shinto ceremony was held to pray for the safety and success of the refurbishment.

5. The water surface is visible under the white reflection sheet

6. The water in Super-Kamiokande is drained from the bottom of the tank.

7. The drained water is pumped up 40m and discharged through the side-ditch in the mine.

8. The pure water system that has continuously circulated and filtered water for 12 years was switched to inner circulation.

9. When the water level is lowered about 2m from the top, the photomultiplier tubes (PMTs) in the outer detector become visible.

10. When the PMTs in the outer detector are removed, the back of the PMTs in the inner detector can be seen.

11. The PMTs in the inner detector are removed using the crane.

12. Three PMTs in the inner detector are fixed as a set.

13. The workers are entering the tank with a green gondola lift.

14. Once the 24 PMTs at the entrance were removed, the inside of the tank was finally visible. The blue dots are from light being reflected off of the bottom PMTs.

15. The view inside the tank when the water level is lowered about 4m from the top.

16. People work inside the tank on boats or floating platforms.

17. Inspecting new PMTs and assembling the PMT covers.

18. Connecting the cables of PMTs installed in the outer detector.

19. Measurement of magnetic field in the inner detector.

20. The floating platforms are more stable than the boats, and facilitate work in the tank.

21. Replacement work of outer detector PMTs.

22. Applying waterproofing agents at welding joints of the stainless steel panels.

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