Implementation at Modane Grenoble - Summary of Copper Sphere Design and Fabrication Tests

This article provides an overview of the implementation at Modane Grenoble on June 11th, 2019, focusing on the design and fabrication tests of a copper sphere. It covers technical data, fabrication processes, material certificates, operation details, and installation status. The copper sphere features specific dimensions, material specifications, and testing procedures to ensure its functionality. The associated images visually depict the different stages of the sphere construction and testing, including lead shielding design elements.

• Modane Grenoble
• Copper Sphere Design
• Fabrication Tests
• Lead Shielding
• Technical Data

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1. NEWS-G Implementation at Modane Grenoble June 11th, 2019 Michel ZAMPAOLO Modane Underground Laboratory (Laboratoire souterrain de Modane France) June 11th-2019 1

2. Outline Copper sphere Technical data Tests during and after fabrication Status of lead shielding Shop test assembly Possible improvements June 11th-2019 2

3. Copper sphere design One flange made of copper plated stainless steel (plating by explosion) Copper nozzle machined from C10100 bar 2 hemispheres spinned from sheets of copper June 11th-2019 3

4. Copper sphere technical data Inside diameter of the sphere : 1350 mm Total height: 1650mm Diameter of the nozzle : 60mm- CF flange 63- 316 SS Grade of copper: C10100 as per ASTM B152 Producer of the copper: Aurubis (Germany) Wall thicknesses: from 9 to 15 mm Operating pressure: vacuum to 1 bar g Pressure test: minimum 2 bar g Vacuum test : helium June 11th-2019 4

5. Copper sphere fabrication tests Material certificates Ultrasonic test of the cladding by Nobel clad Report of the thicknesses after spinning Hydraulic pressure test : - with demineralised water - pressure : 4 bar g - duration: 20min minimum Vacuum test : - at few 10-6 mbar abs - with helium leak detector - leak rate: 10-9 mbar.l/s - vacuum losses, valve closed: less than 2.10-8 mbar/s Dimensional report: - sensor location: at less than 10mm from the center of the sphere June 11th-2019 5

6. Copper sphere operation June 11th-2019 6

7. Copper sphere installation Present satus of the sphere in LSM: no shielding; glove box is connected. External etching to be done before the full final assembly June 11th-2019 7

8. Copper sphere design June 11th-2019 8

9. Lead shielding design 6 main pieces of lead shielding 22cm very low activity lead 3cm roman lead SS enclosure12mm June 11th-2019 9

10. Lead shop test assembly The lead is poured in the SS and is integral with it. Roman lead is bolted on the low activity lead. Each one of the 6 sets is machined 1-Full assembly of lead pieces at the foundery workshop in June 2019 2-Shop test assembly in Underground lab in Modane: lead + sphere in June and July: - checking of the clearance between sphere and lead: 9 to 16mm - leakage test of the SS envelop with N2at 5mbar: less than 2l/min. June 11th-2019 10

11. Machining of lead shielding Lead pieces have been machined in a workshop at 100 km from Modane June 11th-2019 11

12. Lead shop test assembly at the Founderies - Assembly of south hemisphere of lead Checking of inside surface of lead with a wooden frame simulating the copper sphere Positionning of the tool for centerlining the sphere- centring pins. - - Delivery schedule: - South next week - North last week of june June 11th-2019 12

13. Lead shop test assembly at the Founderies June 11th-2019 13

14. Handling Example of adjusment of length of chains for handling half equator June 11th-2019 14

15. Centering of the copper sphere Tool for tuning of the sphere inside the lead June 11th-2019 15

16. Final assembly in Modane lab in July 2019 June 11th-2019 16

17. HDPE for final assembly June 11th-2019 17

18. Circular water tank 3mx3m June 11th-2019 18

19. Improvements for the future Have a straight part of the dished ends: 30 to 50mm. Postpone the machining of the hemispheres to the time of the assembly by welding Raw copper specification: get a higher annealing of the material Add a feeding pump in the etching loop Think about all the testings to be done before assembly of different parts of the sphere. Reduce the cosmic ray exposure time. Machining of the inside surface of lead for cleanliness June 11th-2019 19

20. Thank you for your attention June 11th-2019 20