Update on 201-MHz RF Cavity Construction (Plan) for MICE

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Presentation transcript:

Update on 201-MHz RF Cavity Construction (Plan) for MICE Derun Li and S. Virostek Center for Beam Physics Lawrence Berkeley National Laboratory MICE-20th Collaboration Meeting RAL, UK February 10 – 13, 2008

Outline MICE Cavity Design Summary Based on the design of 201-MHz cavity for MUCOOL Cavity body Ports for power coupler, vacuum and probes RF power loop coupler and ceramic RF window Curved Beryllium window Tuners Interface and integration with RFCC module Summary Status and fabrication plan Techniques developed for MUCOOL cavity Spinning, port extruding, curved Be windows, RF couplers

MICE Cooling Channel Eight 201-MHz RF cavities LH2 absorbers Courtesy of S. Q. Yang, Oxford Univ.

MICE RF Cavity Eight 201-MHz cavities + with materials for two more spares Baseline design: 201-MHz for MUCOOL, but Cavity body profile needs to be modified Resonant frequency Better estimation of spring back after spinning Port extruding Port interface is different from the MUCOOL cavity RF coupler and ceramic window Same as the MUCOOL cavity with Toshiba ceramic windows for SNS Curved Beryllium windows Modified design to better control silver alloy flow during the brazing Tuners and interface with RFCC module Post-processing: Water cooling pipes, cleaning (EP & water rinsing), low power measurement, tuning, assembly and shipping

Cavity Design Parameters The cavity design parameters Frequency: 201.25 MHz β = 0.87 Shunt impedance (VT2/P): ~ 22 MΩ/m Quality factor (Q0): ~ 53,500 Be window radius and thickness: 21-cm and 0.38-mm Nominal parameters for cooling channels in a muon collider or a neutrino factory and MICE ~ 16 MV/m (~ 8 MV/m) peak accelerating field Peak input RF power ~ 4.6 MW (~ 1 MW) per cavity (85% of Q0, 3 filling) Average power dissipation per cavity ~ 8.4 kW (~ 1 kW at 1 Hz repetition rate and 1 ms pulse length) Average power dissipation per Be window ~ 100 watts (~ 12 watts)

MUCOOL Cavity Review Design and engineering at LBNL Half shells spun at Acme in Minnesota Parts made in Univ. of Mississippi and LBNL E-beam welding & port-pulling, cleaning and EP at J-Lab, NASA Coupler tests at SNS, Oak Ridge National Lab Final assembly and high power tests at MTA, FNAL (March-2006) and reached 16-MV/m without external magnetic field

The Cavity Body Profile Low peak surface field and easy fabrication Spherical section at the equator to ease addition of ports (± ~ 6o) Elliptical-like (two circles) nose to reduce peak surface field Stiffener ring 2o tilt angle 6-mm Cu sheet permits spinning technique and mechanical tuners similar to SCRF ones De-mountable pre-curved Be windows pointing in the same direction to terminate RF fields at the iris Bolted Be window E-beam joints Low peak surface field and easy fabrication

Cavity Body MUCOOL cavity frequency is slightly lower than 200-MHz (as long as within bandwidth of RF source) Mechanical (fixed) tuners available and tested MICE cavities Target frequency is 201.250-MHz One RF source (tube) powers more than one cavity Each cavity will be made (spinning) to frequency very close to 201-MHz by modifying the mold used for spinning Frequency shifts by ports and curved Be windows Conceptual tuner designs (fine tuning)

Ports Extruding and Flanges Development of the technique Local annealing of ports Cavity ports being extruded (pulled) Vacuum leak! Extruded port Port flange e-beam weld Finished cavity port

Fabrication of the Coupler Loop coupler The coupling can be adjusted by rotating the loop Water cooling line goes around the loop RF ceramic windows from Toshiba Company RF window

RF Coupling Loop Design Prototype coupling loop design uses standard off-the-shelf copper co-ax Parts to be joined by torch brazing Coupling loop has integrated cooling Two SNS style RF windows mfg. by Toshiba received (no cost!) Bellows connection required on MICE for thermal and dimensional reasons Need to integrate with MICE layout MUCOOL MICE

Curved Be Windows We have made two windows available so far 21-cm and 0.38-mm thick Good braze (between annular frames and foil) Achieved ~ 95 % of the designed profile Thin Ti-N coatings The windows were HP tested at MTA, Fermilab 42-cm

Beryllium Window Update Improved design for better brazing Be foil

Tuners for MICE Cavities Four 201-MHz cavities in each RFCC module; one tuner assembly on each cavity. 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

Tuner Section View Tuner actuator Pivot point (likely air) Dual bellows feedthrough Fixed (bolted) connection Ball contact only

MUCOOL Cavity Tuners

Integration to RFCC Module RF couplers, vacuum, RF probes, tuners, water cooling pipes Vacuum weld on interior

Post-Processing Cavity cleaning and assembly Low power RF measurements and shipping

Summary Status Design and Fabrication Plan Cavity design modifications Cavity body profile Modified Be window designs Tuners and interface with RFCC module Apply successful techniques developed from MUCOOL cavity R&D Spinning, port extruding and post-processing Re-qualify venders (spinning, e-beam welding, port extruding and post-processing) with our supervision US vendors: NIOWAVE, … HIT in China Brush-Wellman for Be windows Toshiba for ceramic RF windows Design and Fabrication Plan Design review ~ May 2008 Schedule has been developed (~ by early 2010)