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Field Period Assembly

Field Period Assembly. August 10, 2004. T. Brown. Agenda. Review MC/VV and MC/MC assembly clearances Describe the installation assembly concept Discuss alignment methods and issues Discuss instrumentation, position sensing and control requirements

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Field Period Assembly

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  1. Field Period Assembly August 10, 2004 T. Brown

  2. Agenda • Review MC/VV and MC/MC assembly clearances • Describe the installation assembly concept • Discuss alignment methods and issues • Discuss instrumentation, position sensing and control requirements • Discuss the need for mock-ups to practice the MC installation • Review the NCSX schedule to set the timeframe for releasing drawings/specs to vendors

  3. Review MC/VV and MC/MC assembly clearances

  4. A 1.76" (metal-to-metal) min clearance between MC’s and VV. VV insulation is 1.0” and VV/MC nominal tolerances are 0.06”.

  5. A .45” minimum clearance exists between the Type A’s as the two half period MC shells comes together.

  6. Overall installation assembly concept

  7. Local beam is added to pick up existing MC tapped holes

  8. CG location shown in plan view MC half period weight = 20,260 lbs

  9. Inboard and outboard gravity support point for the installation device. Installation device rotation connection point

  10. Z Y X Total Weight of alignment system 17,880 lbs (assumes steel construction) RY = 14° RX = 6° • Design uses: • structural steel components • worm gear screw jacs • Hilman Rollers DZ = 27” RZ = 14° DX = 10” DY = 75”

  11. Gantry crane supports the MC and moves it the final ¾” • When finished the alignment system is retracted and moved to the opposite side

  12. 249” (20.75’) Local roller device located on gantry crane

  13. 215” (17.9’) 249.2” (20.8’) VV base support stand. Local support and roller system for final movement of one MC half period. Modular coil assembly fixture support structure

  14. MC half period secured to the local roller system, maintaining the MC position

  15. 300 “ 227”

  16. Alignment methods and issues

  17. CG location VV weight = 3157 lbs

  18. 174.7” (14.6’) Proposed concept for the initial alignment of a support base for the vacuum vessel. The VV is supported off the floor (fixture not shown) to allow positioning / alignment of a support base.

  19. Aluminum plates 77 lb 115 lbs Alignment fixture Base alignment fixture allows 6-degrees of motion using slotted holes and spherical washers.

  20. Cone locator pin and bushing

  21. Cone locator pin and bushing on VV side and support stand side. VV and support stand pre-alignment should simplify the final positing of the VV.

  22. VV Support Arrangement VV rests on a base support and has a stability connection to the gantry frame

  23. Instrumentation, position sensing and control requirements – what’s involved? Can fiber optics or position sensors be used in tight locations to monitor clearances? What controls are needed on the servos? Is it cost effective for the assembly to be computer driven and position monitored?

  24. Current motion is based on a 200 step servo table to drive the six servo motors

  25. Some type of position sensing is needed to assure that collisions between the MC and VV are avoided.

  26. Need for mock-ups to practice the MC installation

  27. Finish winding 1st MC A, B &C Field period assembly practice runs using mock-ups Finish winding 2nd MC A, B &C Assembly of 1st half period NCSX MC / VV installation schedule requirements FY04 FY05 FY06 FY07 Starting pt. 3 mo Prepare bid package & award contract 9 mo Detail design & Fab assembly fixture 3 mo Note: this schedule is based on very preliminary MC fabrication estimates.

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