1. Cavity + He Vessel interfaceMI

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

3. 3D Model

4. 3D Model

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

12. 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

13. 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

14. 3D Model

15. 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