Cavity Cool Down and Cavity Support N Nigam

Cavity Cool Down and Cavity Support N. Nigam 650 MHz High Beta CM Prototype PDR 11 December 2019 In partnership with: India/DAE Italy/INFN UK/STFC France/CEA/Irfu, CNRS/IN 2 P 3

Contents • • Charge 1 a, 1 b & 1 c Introduction Cooldown simulation for Support post & Cavity C-clamp design Conclusion 12/11/2019

Introduction Charge 1 a, 1 b & 1 c • The prototype High Beta 650 MHz cryomodule will have four β=0. 9 cavities and two β=0. 92 cavities. • Cooldown simulation for both the type of cavity have been performed for thermal contraction. • All the interface have been considered during simulation. • On the basis of simulation design requirement for different bellows in p. CM have been written. • A design report was prepared with Teamcenter Number ED 0010081. • Cavity support using C-clam (During cooldown & Transportation) 0. 92 cavities 12/11/2019 0. 9 cavities

Description of the model Charge 1 a, 1 b & 1 c 24 Nos. 06 Nos. 12 Nos. Cavities & cavity support have been modeled independently. Any mismatch will be taken care by C-clamp. 12/11/2019

Cool down of the cavity support Charge 1 a, 1 b & 1 c • G-11 Support post designed by T. Nicol with Teamcenter Number ED 0009950. “ 650 MHz Cryomodule Support Post Shrink Fit Analysis”. • During simulation SS & Ti cavity support have been considered. Simulation model with Boundary condition and loading 12/11/2019 Temp. distribution (output of thermal analysis) Structural simulation model with Boundary condition and loading

Cool down of the cavity support Charge 1 a, 1 b & 1 c Based on the simulation & Also advantage of having better Magnetic hygiene , Ti cavity support was proposed 12/11/2019

Cool down of the cavity • Cooldown simulation for both the cavity was performed from Room temp. to 2 K. • Thermal contraction was evaluated. Results for β 0. 9 cavity 12/11/2019 Charge 1 a, 1 b & 1 c

Cool down of the cavity Charge 1 a, 1 b & 1 c Results for β 0. 9 cavity Similar Thermal contractions were evaluated for β=0. 92 cavity w. r. t. to Strongback 12/11/2019

C_Clamp Charge 1 a, 1 b & 1 c • The C-Clamp placed on support structure must have following feature q q Fine adjustment of position alignment during string assembly Locking feature during transportation. Accommodate thermal contraction of dressed cavity during cooldown. Maintain cavity position during operation. Left Hand Side C-Clamp 2 Nos. per cavity 12/11/2019 Right Hand Side C-Clamp 2 Nos. per cavity

C_Clamp Charge 1 a, 1 b & 1 c • The C-Clamp placed on support structure must have following feature q q Fine adjustment of position alignment during string assembly Locking feature during transportation. Accommodate thermal contraction of dressed cavity during cooldown. Maintain cavity position during operation. A wire welded to the bearing support will prevent the bearing to fall during the transportation even if some screws got loosed 12/11/2019 During transportation a cap will be put on the Belleville assemblies to lock the movement. These caps will be removed through access port after transportation

C_Clamp Charge 1 a, 1 b & 1 c Access port are available on both side of the vacuum vessel 12/11/2019

Conclusion Charge 1 a, 1 b & 1 c • Thermal contraction of both the cavity in cryomodule have been simulated & design report was prepared with Teamcenter Number ED 0010081 – Displacement is acceptable • C clamp (interface between dressed cavity & cavity support) can secure position during transportation & operation. A design report have been prepared for C clamp with Teamcenter number ED 0011241. 12/11/2019

End 12/11/2019