Disk-damped versus Quadrant-damped from engineering view point

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Presentation transcript:

Disk-damped versus Quadrant-damped from engineering view point 2nd International Collaboration Meeting on X-Band Accelerating Structure 080513 KEK Y.Higashi

Contents of engineering view point (still under studying/rough estimation) Engineering requirements Comparison of fabrication procedure Comparison of machining Material shaping characteristics Geometrical characteristics RF measurement/Tuning Summary

Engineering requirements @ 2a,2b +/- 1micron (needs rf tuning) @ Bookshelf < 100mradian @ Roughness < 1 micron including grain boundary step @ Corner shape complete round @ Out gas small amount @ Vacuum level < 10-9 Torr @ Cooling system

Comparison of fabrication procedure Quadrant type Disk type Making perpendicular shape Rough/medium milling *Annealing (500deg.C) Etching Assemble of four quadrants rf tuning Set into the vacuum vessel *500deg.C baking Instauration In-situ baking Slicing from bar Rough/medium machining Annealing (500deg.C) Final tuning Final milling rf inspection each other Etching Bonding (cooling pipes, coupler) rf tuning H2 firing / 500deg.C baking Instauration In-situ baking * If CuZr material is impossible?

Comparison of machining Quadrant type Disk type Diamond tuning machine/ tool Environmental Temp. control (+/- 0.5 deg.C) 3D Milling machine (tool positioning resolution 0.01 micron/ WC/diamond tool) CMM (0.01 micro resolution) Chucking tool for turning/milling Disks stacking tool (precise V-block) Bonding/Brazing jig 3-5D milling machine ball end mill tool with precise profile (1 micron tool positioning accuracy) CMM (1 micron accuracy) Alignment tool/ jig Fixture of quadrants Quadrants assembly tool (optical microscope, CMM….)

Material shaping characteristics Ball end milling Diamond Tuning (mainly Quadrant) (mainly Disk) Poor tool position Tezel point (No velocity) Ball end mill tool Cavity iris Damage layer ~ 1-2 micron Mechanical/thermal stress Eliminate Tezel point Simultaneous 4~5 axis control machine Diamond tool Can be controlled dimensions by feed forward technique Tool wear control Damage layer 0.1 micron

Geometrical characteristics Quadrant Disk Asymmetric shape Cylindrical symmetric shape Deformation due to milling Deformation due to tuning/milling >> But Depend on annealing A point to be considered Deformation due to stress by pulse heating? Hard stress by milling

RF measurement/Tuning 　 Quadrant Disk Only play after assembly Can be inspect each cell

Summary @ Precise fabrication of Quadrant and Disk type structure already performed. @ Precise integration techniques of quadrant structure still under studying. Most important thing is breakdown characteristics Will be discuss at tomorrow session