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MICE RFCC Module Update

Allan DeMello Lawrence Berkeley National Lab. MICE RFCC Module Update. MICE CM26 at Riverside California March 26, 2010. MICE RFCC Module Update Overview. RF Cavities RF Cavity Frequency Tuners Cavity RF Coupler RFCC Schedule. MICE RFCC Module RF Cavity Update.

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MICE RFCC Module Update

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  1. Allan DeMello Lawrence Berkeley National Lab MICE RFCC ModuleUpdate MICE CM26 at Riverside California March 26, 2010

  2. MICE RFCC Module Update Overview • RF Cavities • RF Cavity Frequency Tuners • Cavity RF Coupler • RFCC Schedule

  3. MICE RFCC ModuleRF Cavity Update

  4. RF Cavity Progress Summary • Fabrication of first 5 cavities by Applied Fusion finished in December 2009 • In February 2010 the contract was awarded to Applied Fusion for fabrication of the second 5 cavities • Physical measurement process has been started on the first 5 cavities • Cavity RF frequency measurements have begun

  5. RF Cavity Fabricator - Applied Fusion, Inc. • Contract for the second 5 cavities was awarded to Applied Fusion in February • Applied Fusion fabricated the complete RF cavity (minus spinning) Electron beam welding machine

  6. RF Cavity Shells • The second batch of spun cavity shells were delivered to Applied Fusion in February • They have started fabrication of the second group of 5 cavities

  7. RF Cavity Beryllium Windows • Cavity Be windows are being fabricated by Brush Wellman Inc. • LBNL has received three finished windows

  8. RF Cavity Be Window • Cavity Be window alignment to nose ring looks good • Some machining of the nose ring may be necessary to flatten mounting surface • Be window mounted to cavity with clamping ring

  9. RF Cavity Physical Inspection • Cavity being inspected • Cavity being lifted out • of shipping crate • Cavity mounted in fixture being lifted onto CMM

  10. RF Cavity Inside Profile Measurement • Special probe to measure the inside profile of the cavity • Cavity interior profile being measured with special probe • The profile will be used to verify cavity RF models

  11. RF Cavity Frequency Measurement • Cavities waiting for frequency measurement • Dr. Li measuring cavity frequency • The Be windows are installed to give an accurate measure of the frequency

  12. RF Cavity Progress Summary • Fabrication of first 5 cavities by Applied Fusion finished in December 2009 • In February 2010 the contract was awarded to Applied Fusion for fabrication of the second 5 cavities • Cavity physical measurement process started • Cavity RF frequency measurements have begun

  13. RF Cavity Future Work • The inside surface of each cavity needs to be electro-polished (done at LBNL) • Physical and frequency measurements on the remaining 5 cavities when they become available • Cavities must be “tuned” to each other for best center frequency (10 cavities) by plastic deformation if necessary (will be done at LBNL)

  14. MICE RFCC ModuleRFCavity Frequency Tuner Update

  15. RF Cavity Frequency Tuner Progress Summary • Tuner design is complete • ¼ scale model has been fabricated to test flexure concept • One full size tuner arm (for testing the system) has been fabricated • Aluminum test cylinder (1/6 of cavity) has been fabricated • Actuator mechanical components have been fabricated • Actuator bellows have been delivered to LBNL • Assembly of an actuator has begun at LBNL • Control system components have been delivered to LBNL

  16. RF Cavity Frequency Tuners • 24 Dynamic Cavity Frequency Tuners per Module • Tuner Actuator • Tuners operate in a bi-directional “push - pull” mode (±2mm) • Tuning automatically achieved through a frequency feedback loop

  17. RF Cavity Frequency Tuner Components • Tuner/actuators are thermally independent of the vacuum vessel • Dual – action actuator • Actuator is • screwed into • the tuner arm • Flexure • tuner arm • Fixed‏ • connection • Forces are transmitted to the stiffener ring by means of “push-pull” loads applied to the tuner lever arms by the dual action actuator assembly

  18. Actuator Design • Actuator design incorporates a sealed enclosure between vacuum and air. • Actuator is mounted to the tuner arm only • Bellows allows angular movement for actuator • Piston plates are joined at the perimeter • Piston plates incorporate hard stops

  19. Prototype Actuator Components Upper piston Center plate Lower piston Lower support • Actuator mechanical components have been fabricated and delivered to LBNL

  20. Prototype Actuator Components Upper bellow Lower bellow • Actuator design incorporates two bellows attached to the pistons and the center plate

  21. Tuner System Analysis • The Von Mises stress at the flexure is 29.7 kpsi • The input load by the air actuator is 800 lbs • The tuner arm displacement is 0.214” (~0.43” bi-directional) [movement exaggerated] • The cavity displacement is 1.05mm per side

  22. Tuner Flexure and Test Ring • Full size (3” thick) prototype tuner flexure with test ring • Threaded actuator mounting hole

  23. Emerson ER3000 electronic pressure controller • ± 0.1% accuracy (over 110 psi range) • 110 psi normal operating range (120 Max.) • Remote computer controlled • 16 required for two RFCC modules

  24. RF Cavity Tuner System Schematic

  25. RF Cavity Tuner System Components Controlled Leak Valve Pressure Sensor Regulator Electronic Pressure Controller Power Supply 5 Micron Filter Computer Interface

  26. RF Cavity Frequency Tuner Progress Summary • Tuner design is complete • ¼ scale model has been fabricated to test flexure concept • One full size tuner arm (for testing the system) has been fabricated • Aluminum test cylinder (1/6 of cavity) has been fabricated • Actuator mechanical components have been fabricated • Actuator bellows have been delivered to LBNL • Assembly of an actuator has begun at LBNL • Control system components have been delivered to LBNL

  27. RF Cavity Frequency Tuner Future Work • Complete the assembly of the prototype actuator • Assemble the complete actuation system • Test the single actuator/tuner and cylinder system • Work on the interfacing to the RAL computers • Order parts for 6 actuators (incorporating any refinements from the prototype) • Fabricate 5 more tuner flexures

  28. RF Cavity Frequency Tuner Future Work • Build a cavity suspension frame • Test of the RF tuning system with 6 tuners and actuators on a cavity • Actuators will be manifolded together • Frequency measurements will be taken to verify the frequency tuning range

  29. MICE RFCC ModuleCavity RF CouplerDesign Update

  30. Cavity RF Coupler • Section view of cavity RF coupler • Based on successful SNS design with a Toshiba window • Detailed fabrication drawings of the major components are complete

  31. Cavity RF Coupler • Assembly drawing of cavity RF coupler • Prototype of outer coax assembly will be made

  32. Cavity RF Coupler Design Summary • Detail drawings of major components are complete • Sources for fabrication materials (e.g. 4” outer coax tube) have been identified • Assembly method has been determined

  33. Cavity RF Coupler Future Work • 16 Toshiba windows (plus spares) need to be ordered soon because of long lead times • Myat RF couplers need to be purchased • Prototype of the outer coax will be fabricated to verify assembly method • Vendor selection process will be started

  34. Schedule Summary

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