Cavity + He Vessel interface MI

Introduce Cavity interface with He Vessel FPC interface with cavity HOM Coupler interface with cavity

3D Model

3D Model

Cavity interface with He Vessel Design Requirements Minimize Microphonics Fluctuations (dF/dP) Reduce Lorenz Force Detuning (LFD) Reduce Bellows Diameter All Stiffening Rings at 100mm Radius PIP-II 650MHz Cavity

C. Grimm | Mechanical Design of HB 650 Cavities Design Issues MC Endgroup Endgroup Electron-Beam Welding Sequence 11/9/2015 C. Grimm | Mechanical Design of HB 650 Cavities

C. Grimm | Mechanical Design of HB 650 Cavities Design Issues FP Endgroup Endgroup Electron-Beam Welding Sequence 11/9/2015 C. Grimm | Mechanical Design of HB 650 Cavities

C. Grimm | Mechanical Design of HB 650 Cavities Design Issues MC Endgroup FP Endgroup Dumbbell Assembly Endgroup to Dumbbell Electron-Beam Welding 11/9/2015 C. Grimm | Mechanical Design of HB 650 Cavities

C. Grimm | Mechanical Design of HB 650 Cavities Design Issues Cavity is Ready Degassing/Annealing Process at Minimum of T = 600 C Titanium Transition Titanium Bellows After Degassing/Annealing the Titanium Transition and Titanium Bellows are Electron-Beam Welded to the Endgroups 11/9/2015 C. Grimm | Mechanical Design of HB 650 Cavities

C. Grimm | Mechanical Design of HB 650 Cavities Design Issues EBW Direction EBW Direction EBW Direction Close-Up of Titanium to Nb-Ti Electron-Beam Welding 11/9/2015 C. Grimm | Mechanical Design of HB 650 Cavities

C. Grimm | Mechanical Design of HB 650 Cavities Design Issues Titanium Helium Tank Titanium Transition Ring Dressing the Bare Cavity with a Helium Vessel 11/9/2015 C. Grimm | Mechanical Design of HB 650 Cavities

C. Grimm | Mechanical Design of HB 650 Cavities Design Issues TIG Weld #1 TIG Weld #2 TIG Weld #3 Glovebox TIG Welding 11/9/2015 C. Grimm | Mechanical Design of HB 650 Cavities

High beta 650 MHz dressed cavity Internal magnetic shield Magnetic shield end cap 2/16/2016 Slava Yakovlev, PIP II linac: challenges, issues and status

3D Model

Beam pipe length decrease from 300mm to 200mm Design NEW tuner 3D Model： Beam pipe length decrease from 300mm to 200mm Design NEW tuner Main Coupler interface and position HOM Coupler interface and position