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Progress on the MICE 201 MHz Cavity Design

Progress on the MICE 201 MHz Cavity Design. Steve Virostek Lawrence Berkeley National Lab.  automatic tuners  cavity suspension  cavity installation. RF Working Group Meeting @ Fermilab August 22, 2007. RF Cavity & Coupling Coil Modules in MICE. RFCC Modules.

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Progress on the MICE 201 MHz Cavity Design

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  1. Progress on the MICE 201 MHz Cavity Design Steve Virostek Lawrence Berkeley National Lab  automatic tuners cavity suspension cavity installation RF Working Group Meeting @ Fermilab August 22, 2007

  2. RF Cavity & Coupling Coil Modules in MICE RFCC Modules Steve Virostek - Lawrence Berkeley National Lab

  3. Updated RFCC Module 3D CAD Model Steve Virostek - Lawrence Berkeley National Lab

  4. Updated RFCC Module 3D CAD Model Cavity suspension Automatic tuners 201 MHz RF cavity Steve Virostek - Lawrence Berkeley National Lab

  5. Cavity End View with Tuners and Struts • Six tuners per cavity provide individual frequency adjustment • Tuning automatically achieved through a feedback loop • Six struts per cavity provide a kinematic mounting system • Struts fix cavity position without over-constraint Steve Virostek - Lawrence Berkeley National Lab

  6. Cavity Tuner Design Features • Tuners are spaced evenly every 60º around cavity • Layout is offset by 15º from vertical to avoid conflict with cavity ports • Tuners touch cavity and apply loads only at the stiffener rings • Tuners operate in “push” mode only (i.e. squeezing) Steve Virostek - Lawrence Berkeley National Lab

  7. Four Cavity Layout in Vacuum Vessel • Clocking of tuner position between adjacent cavities avoids interference • Actuators offset from cavity center plane due to width of coupling coil • Soft connection only (bellows) between tuner/actuators and vacuum vessel shell Steve Virostek - Lawrence Berkeley National Lab

  8. Cavity Tuner Section View Tuner actuator (likely air) Pivot point Dual bellows feedthrough Fixed (bolted) connection Ball contact only Steve Virostek - Lawrence Berkeley National Lab

  9. Tuner component Details Actuator & bellows assembly Fixed arm Pivoting arm Forces are transmitted to the stiffener ring by means of “push/pull” loads applied to the tuner lever arms by the actuator assembly Steve Virostek - Lawrence Berkeley National Lab

  10. Cavity Tuning Parameters • The following parameters are based on a finite element analysis of the cavity shell. Tuning range is limited by material yield stress. • Overall cavity stiffness: 6120 N/mm • Tuning sensitivity: +115 kHz/mm • Tuning range: 0 to -460 kHz (0 to -4 mm) • Number of tuners: 6 • Maximum ring load/tuner: 4.1 kN • Max actuator press. (50 mm): 1.6 MPa (230 psi) Steve Virostek - Lawrence Berkeley National Lab

  11. Cavity Suspension System • Six strut system provides kinematic cavity support • Orthogonal layout of struts allows accurate cavity alignment and positioning • Kinematic mounts prevent high cavity stresses caused by thermal distortion and over-constraint Steve Virostek - Lawrence Berkeley National Lab

  12. Cavity Suspension System 1 vertical strut 3 axial struts 2 horizontal struts Steve Virostek - Lawrence Berkeley National Lab

  13. Strut End Connection Details The cavity end of the vertical and one of the horizontal struts are attached directly to the stiffener ring The cavity end of the axial and one of the horizontal struts are attached to the fixed leg of a tuner One end of the struts is attached to a fixed lug welded to the ID of the vacuum vessel Steve Virostek - Lawrence Berkeley National Lab

  14. Four Cavity Layout in Vacuum Vessel • Each cavity contains a dedicated set of suspension struts • No contact between pairs of close packed cavities • Struts designed to axially fix outside end of cavity pairs • Tuning deflections increase cavity gap Steve Virostek - Lawrence Berkeley National Lab

  15. Cavity Installation Sequence • Pre-assemble cavities with Be windows and tuners (w/o actuators) • Slide inner cavities into vacuum vessel using spacer/alignment blocks • Shim cavity to align tuner & coupler vacuum feedthus with tuner mounts and cavity ports • Install struts, tuner actuators and RF couplers • Repeat same process for outer cavities Steve Virostek - Lawrence Berkeley National Lab

  16. Upcoming Cavity Work • Integrate the latest coupling coil design with the RFCC module 3D CAD model • Develop final cavity detail fabrication drawings • Order OFHC copper cavity shell material • Re-qualify cavity shell spinning vendor • Complete the detailed design and component specification of the cavity tuner mechanisms • Build and test a prototype tuner system Steve Virostek - Lawrence Berkeley National Lab

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