Overall RFCC Module Mechanical Design

1. Overall RFCC Module Mechanical Design RFCC Module Preliminary Design Review June 4, 2008 Allan DeMello Lawrence Berkeley National Lab

2. The RFCC Module • Vacuum vessel fabrication • Mechanical attachment of the coupling coil to the vacuum vessel • RFCC module support stand • Cavity cooling system MICE RF and Coupling Coil Module PDR - Overall RFCC Module Mechanical Design Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Page 2

3. Vacuum Vessel Fabrication • Vacuum vessel material must be non-magnetic and strong therefore 304 stainless steel will be used throughout • The vacuum vessel will be fabricated by rolling stainless steel sheets into cylinders • Two identical vessel halves will be fabricated with all ports and feedthroughs Main 1400mm rolled tube Bellows flange Smaller diameter rolled tube MICE RF and Coupling Coil Module PDR - Overall RFCC Module Mechanical Design Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Page 3

4. Cross Sectional View of Half the Vacuum Vessel Smaller diameter cylinder welded to main vessel tube to provide clearance for the coupling coil MICE RF and Coupling Coil Module PDR - Overall RFCC Module Mechanical Design Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Page 4

5. The Two Halves Joined(coupling coil not shown) • Central under-cut provides clearance for the coupling coil MICE RF and Coupling Coil Module PDR - Overall RFCC Module Mechanical Design Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Page 5

6. Assembly of the Vacuum Vessel into The Coupling Coil MICE RF and Coupling Coil Module PDR - Overall RFCC Module Mechanical Design Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Page 6

7. Cross Sectional View with the Coupling Coil Gap between the vacuum vessel and the coupling coil provides clearance for assembly Vessel welded around the inside after coupling coil and the second vessel half are in place MICE RF and Coupling Coil Module PDR - Overall RFCC Module Mechanical Design Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Page 7

8. Coupling Coil Gussets • Sixteen special gussets are welded between the coupling coil magnet’s thermal isolation system towers (2 per tower) and the magnet housing MICE RF and Coupling Coil Module PDR - Overall RFCC Module Mechanical Design Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Page 8

9. LBNL Will Weld Gussets from CC to Vacuum Vessel • LBNL will weld in additional gussets that fit between the coupling coil and the vacuum vessel • These gussets will fix the coupling coil to the vacuum vessel MICE RF and Coupling Coil Module PDR - Overall RFCC Module Mechanical Design Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Page 9

10. RFCC Module Support Stand • Because a short stand will be used for shipping and for moving the RFCC into the experiment hall the permanent support stand is bolted onto the vacuum vessel (not welded) MICE RF and Coupling Coil Module PDR - Overall RFCC Module Mechanical Design Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Page 10

11. RFCC Attachment to Support Stand • The vacuum vessel is bolted to a saddle made up of small plates welded to the support stand • Stainless steel bars are welded onto the vacuum vessel for attaching bolted gusset plates Bolted gussets mounting bars MICE RF and Coupling Coil Module PDR - Overall RFCC Module Mechanical Design Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Page 11

12. RFCC Support Stand • RFCC support stand must withstand a longitudinal force of 50 tons transferred from the coupling coil • Bolted gussets and cross bracing provide shear strength in the axial direction (analysis will be done to confirm this stand design) MICE RF and Coupling Coil Module PDR - Overall RFCC Module Mechanical Design Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Page 12

13. Water Feedthroughs • Water flow into and out of the cavity cooling lines will be provided by special feedthroughs • Water connection to the cavity will be made with connectors outside of the vacuum vessel • Possible conversion (at a later date) to liquid nitrogen cooling will necessitate changes to the water cooling feedthrough system • Feedthrough design will be adaptable to accommodate LN MICE RF and Coupling Coil Module PDR - Overall RFCC Module Mechanical Design Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Page 13

14. Liquid Nitrogen Cooling Considerations • Suspension of cavities on struts provides low heat leak from cavity to vacuum vessel • Beryllium window FEA thermal analysis will need to be performed with new parameters • The cavity frequency will be shifted (approximately 600 kHz) therefore tuning system modifications will be needed • Insulators will need to be added to the RF couplers • Coaxial LN feedthrough tubes will be needed to insulate the connection outside of vacuum Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008

15. Module Assembly Sequence 1 Beryllium windows are installed onto the cavities Bare cavity Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008

16. Module Assembly Sequence 2 Assembly of the tuners onto the cavities (w/o actuators) Install struts onto the cavity Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008

17. Module Assembly Sequence 3 • Slide the inner cavity into vacuum vessel using spacer/alignment blocks for support • Shim cavity to align tuner and coupler vacuum feedthroughs with tuner mounts and cavity ports • After adjusting their lengths secure the struts to the vacuum vessel mounting blocks Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008

18. Module Assembly Sequence 4 Install tuner actuators Install RF couplers Install vacuum couplers Install cooling water feedthroughs Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008

19. Module Assembly Sequence 5 Repeat the same process for the outer cavity and for the cavities on the other side of coupling coil Install vacuum valves and pumps Two cavities are installed from each end of vacuum vessel Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008

20. Overall RFCC Module Design Summary • Engineering 3D CAD model of the vacuum vessel mechanical design is nearing completion • Standard machining and manufacturing method will be used • A plan for attaching the coupling coil and the vacuum vessel together has been developed • Conceptual design of the support stand has been started (analysis will need to be performed) • A method for assembling the cavities into the vacuum vessel has been formulated • Cavity water cooling feedthrough system is still in the early stages of development MICE RF and Coupling Coil Module PDR - Overall RFCC Module Mechanical Design Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Allan DeMello - Lawrence Berkeley National Lab - June 4, 2008 Page 20