1. T5.2: Harmonization - Material and Component Reference
Round table
T5.2: Harmonization - Material and Component Reference
Mohammed Fouaidy
CNRS/IN2P3/IPN Orsay

2. Main Goal of Task 5.2 What is stated in the AMICI proposal?
“Establish a common knowledge, background and use among Technological Infrastructures and related laboratories and industries in relation to material and components involved in accelerator and large superconducting magnets. “
Motivations for developing a dedicated database.
Accelerator performances are determined by: 1) The design and engineering of the machine, 2) Material and/or component choice and specifications.
Data and characteristics properties of material and components, when available, are not easy to find in literature. Some of these are transmitted via private communications.
Lack of data on materials and components suited for use and reliable operation in the specific accelerator environment (e.g. radiation, cryogenic temperature…).
Main objective:
Create a common reference database for materials and components used in accelerators (accelerating structures, magnets, diagnostics, ancillaries…) and start to fill it with relevant data.

3. An example: components of ESS spoke cryomodule
Vacuum vessel (SS)
Feedthrough
Thermal shield (Al or Cu)
Gate-valve
Supporting rods (Epoxy glass)
Cold magnetic shield (µ-metal, permalloy, cryoperm, cryophy,….)
Waveguide
Power coupler

4. Cryogenic test of prototype ESS spoke crymodule
Cryomodule housing two fully equipped Double Nb spoke cavities
Jumper
Cold box
Cold tuner,
Magnetic shielding,
Power couple,
Instrumentation
Heat exchanger
JT valves
Tubing, bellows, connections
MLI
Instrumentation

5. Mechanical behavior under pressure
From design by institute to industrial fabrication
Design and computation using Industrial codes
Material:
Cavity: High purity Nb RRR~300
Helium tank: Ti
Flanges: SS or Ti
Bellows: Ti
Industry know how:
Deep drawing
EBW
Brazing
Mechanical behavior under pressure
H field
Material data needed for design and fabrication:
Structural (grain size), mechanical properties (E, v, Strain vs stress curve)
Superconducting, electrical (RRR), thermal properties (Conductivity),…

6. RF Power coupler Industrial know how: Inner conductor:
High RF power (Kystrons, IOT,..)
RF components (WG, loads, ..)
Vacuum brazing (RF window)
Surface treatment (Copper plating: inner& outer conductors, TiN deposit: Al2O3 window )
Mechanical fabrication and assembly
Instrumentation: vacuum, light, electron activity
Inner conductor:
OFHC copper
e- pick-up
Alumina
disc
Outer conductor
Vacuum gauge

7. Fast Active Cold Tuning System
Slow and coarse tuner
Function: slow and long range (~2mm, 500 kHz) resonant frequency adjustment during cool down from RT to K.
Actuator: Stepping motor&planetary gear box
Fast and fine tuner
Function: Fast active compensation of short range (~4µm, 1kHz) Lorentz detuning during cavity operation.
Actuator: Piezoelectric actuator

8. Database content Material properties 2. COMPONENT Some examples:
Thermal properties (conductivity, specific heat,…)
Mechanical properties
Magnetic properties
Electrical properties
Radiation hardness
Some could be parameters-dependent (e.g Tdependent)…
2. COMPONENT
Ancillaries, as used to implement accelerator systems
Cables,
RF feedthrough, HV feedthrough
Screws, bolts
Gaskets
Sensors/ Electronics
Temperature sensors
Piezoelectric actuators

9. Need of strong collaboration between institutes and industry
Reliability studies, lifetime tests, specific data (cryogenic temp., radiation)
Component design and fabrication
Design and computation using Industrial codes
Sharing knowledge and expertise to be efficient and succeed
Actuators characterization in superconducting accelerator environment (low temperature, radiation (X rays, neutrons) ,…)
Steeping motor lifetime tests
Characterization of Cu and TiN at institutes (Dedicated facilities: cryogenic tests, SIMS,…)