Design of a 9-cell Cavity Test CryomDesign of a 9-cell Cavity Test Cryomodule for ILC in Chinaodule for ILC in China

IHEP-TIPC ILC Cryomodule R&D GroupIHEP-TIPC ILC Cryomodule R&D Group

Institute of High Energy Physics (IHEP), CASInstitute of High Energy Physics (IHEP), CASTechnical Institute of Physics and Chemistry (TIPC), CASTechnical Institute of Physics and Chemistry (TIPC), CAS

2007.11.62007.11.6

OutlineOutline

• Introduction to the ILC Cryomodule collaboration group

• Design of a 9-cell cavity test cryomodule (Structure, Flow diagram )

• Thermal and mechanical simulation

• Collaboration work with KEK STF

IHEP-TIPC ILC Cryomodule R&D groupIHEP-TIPC ILC Cryomodule R&D group

IHEP高杰 (Gao Jie) 研究员孙毅 (Sun Yi) 副研究员徐庆金 (Xu Qingjin) 博士翟纪元 (Zhai Jiyuan) 助研李春华 (Li Chunhua) 工程师候治龙 (Hou Zilong) 工程师

TIPC刘立强 (Liu Liqiang) 研究员熊联友 (Xiong Lianyou) 副研究员陆文海 (Lu Wenhai) 高级实验师宗占国 (Zong Zhanguo) 博士生赵同宪 (Zhao Tongxian) 博士生

Monthly regular meeting

Group leader: Prof. Jie Gao

Work AssignmentWork Assignment

Structure design ：徐庆金，刘立强，熊联友，陆文海，孙毅，宗占国，翟纪元，葛眀启，李春华，赵同宪，高杰。

Fluid and temperature field simulation ：徐庆金，赵同宪，熊联友，刘立强

Mechanical and thermal stress simulation ： 候治龙，徐庆金，宗占国，李春华

Design of tuner ：徐庆金，葛眀启，候治龙，李春华

Design of the Input coupler ：翟纪元，葛眀启，徐庆金，李春华

Fabrication techniques ：陆文海，宗占国，李春华，徐庆金

3D engineering drawing ：李春华，赵同宪

Cost estimation：熊联友，陆文海，孙毅

Design of a 9-cell cavity test cryomodule - StDesign of a 9-cell cavity test cryomodule - Structureructure

Structure of the China test cryomodule

Design of a 9-cell cavity test cryomodule - FloDesign of a 9-cell cavity test cryomodule - Flow diagram w diagram

Right: T-S diagram of the 2K heliumLower: Flow diagram of the cryomodule

Thermal and mechanical simulationThermal and mechanical simulation

Upper: Vertical displacement at the room temp.Upper right: Axial displacement at the room temp.Lower right: Transverse displacement at the room temp.

Thermal and mechanical simulationThermal and mechanical simulation

Upper: Vertical displacement at 2K.Upper right: Axial displacement at 2K.Lower right: Transverse displacement at 2K.

Thermal and mechanical simulationThermal and mechanical simulation

Temperature distribution and thermal displacement of the 5K shield with the helium flow 0.08 g/s

Thermal and mechanical simulationThermal and mechanical simulation

Upper: Stress distribution of the support post at the room temp.Upper right: Horizontal displacement at the room temp.Lower right: Vertical displacement at the room temp.

Thermal and mechanical simulationThermal and mechanical simulation

Stress distribution of the support post after cool down

Static temperature distribution of the support post

Vertical displacement of the support post after cool down

Horizontal displacement of the support post after cool down

Heat load estimationHeat load estimation

Heat source Static (W) Dynamic (W)

70K 5K 2K 70K 5K 2K

Radiation 4 0.15 / / / /

Supports 3 0.4 0.05 / / /

Input coupler

7.2 1.2 0.04 3 0.2 0.03

Cavity 0.5 0.2 0.1 / / 0.8

Instrumentation cable

1 0.3 0.2 / / /

other 1 0.3 0.2 / / 0.2

Summary 16.7 2.55 0.6 3 0.2 1.03

To be continuedTo be continued

• Engineering design of the test cryomodule

• 9-cell cavity tuner design

• Fabrication techniques of the cryomodule

• Budget application

• Fabrication

• ……

Collaboration work with KEK STFCollaboration work with KEK STF

35MV Power Coupler Simulation35MV Power Coupler Simulation

Simulation model of the 35MV power coupler

35MV Power Coupler Simulation35MV Power Coupler Simulation

Temperature distribution of the 35MV power coupler

35MV Power Coupler Simulation35MV Power Coupler Simulation

Temperature distribution of the 35MV power coupler

Heat load: 2K - 0.04 W; 5K - 1.2 W; 80K - 7.2WHalf Cross section of thermal anchors: 2K - 0.07 W; 5K - 1.3 W; 80K - 6.8W

45MV Power Coupler Simulation45MV Power Coupler Simulation

Simulation model of the 45MV power coupler

45MV Power Coupler Simulation45MV Power Coupler Simulation

Temperature distribution of the 45MV power coupler

45MV Power Coupler Simulation45MV Power Coupler Simulation

Temperature distribution of the 45MV power coupler

Heat load: SS316L thickness 0.7mm: 2K - 0.06 W; 5K - 3.5 W; 80K - -2.0W SS316L thickness 1.5mm: 2K - 0.064 W; 5K - 3.6 W; 80K - -2.1W

STF 5K shield simulationSTF 5K shield simulation

Simulation model of the STF 5K shield

STF 5K shield simulationSTF 5K shield simulation

Mass flow rate of helium: 1 g/s Maximum temp. difference: Mass flow rate of helium: 1 g/s Maximum temp. difference: 0.91K Hel Helium inlet temperature: 5.0 K Hot spot temp. (coupler port): 5.91Kium inlet temperature: 5.0 K Hot spot temp. (coupler port): 5.91KHelium outlet temperature: 5.25 KHelium outlet temperature: 5.25 K

Temperature distribution of the STF 5K shield (1 coupler)

STF 80K shield simulationSTF 80K shield simulation

Simulation model of the STF 80K shield

Mass flow rate of nitrogen: 1 g/s Maximum temp. difference: 11.05K Mass flow rate of nitrogen: 1 g/s Maximum temp. difference: 11.05K Nitrogen inlet temperature: 80 K Hot spot temp. (shield end): 91.05K Nitrogen inlet temperature: 80 K Hot spot temp. (shield end): 91.05K Nitrogen outlet temperature: 86.8 KNitrogen outlet temperature: 86.8 K

Temperature distribution of the STF 80K shield (1 coupler)

STF 80K shield simulationSTF 80K shield simulation

Collaboration work with KEK STFCollaboration work with KEK STF

Vacuum barrier design of the STF Cryomodule

Length: 2K – 650mm(t1.5); 5K – 600mm(t0.8); 80K – 300mm(t0.8)Heat load: 2K – 0.05W; 5K – 1.69W; 80K – 8.18W; Outer surface temp. – 286.8K. (Natural convection coefficient: 4W/m2 K )

Velocity distribution of the air out of the connection pipe

Temperature distribution of the vacuum isolation structure

Thank you!