회사 소식 Reliability in Fusion Experiments: Macor® Material Performance Under Radiation and Vacuum Conditions

In nuclear fusion research (such as the ITER project or Tokamak devices) and high-energy accelerator experiments, components must not only withstand Ultra-High Vacuum (UHV) but also maintain integrity under intense ionizing radiation and neutron bombardment. Traditional polymer insulators embrittle and outgas rapidly under radiation, while conventional technical ceramics present prohibitive machining challenges. Macor® Machinable Glass Ceramic, with its inorganic non-metallic composition, has emerged as a reliable choice for critical structural and insulating components in these extreme physics experiments.

1. Radiation Stability: Withstanding High-Energy Particle Bombardment

In nuclear physics environments, material degradation primarily manifests through lattice displacement and chemical bond cleavage.

• Resistance to Degradation: As an entirely inorganic silicate-based material, Macor® lacks the organic long-chains susceptible to radiation-induced scission. Under high cumulative radiation doses, it retains its mechanical strength and dielectric properties, unlike engineering plastics (e.g., PEEK) which suffer from dimensional shrinkage or catastrophic property loss.

• Low Induced Radioactivity: The controlled chemical composition of Macor® minimizes the likelihood of generating long-lived induced radioactivity after exposure, facilitating safer maintenance and decommissioning of experimental diagnostic tools.

2. Synergistic Vacuum and Electrical Reliability

Fusion experiments demand extreme purity within the vacuum vessel. Macor®’s specific parameters ensure experimental data accuracy and system safety:

• Zero Porosity (0%): Guarantees no outgassing even at $10^{-9}$ Torr, preserving the purity of the plasma and preventing contamination of sensitive optics.

• Dielectric Strength (45 kV/mm): Prevents high-voltage breakdown in compact diagnostic sensor heads where spacing is minimal.

• Thermal Endurance: Withstands continuous operation at 800°C and peaks up to 1000°C, managing the intense thermal loads generated near fusion reaction zones.

• Machining Precision: Allows for tolerances of ±0.013 mm, enabling labs to modify complex detector mounts in-house for immediate deployment.

3. Typical Applications in Fusion Devices

Macor® is frequently utilized in core areas of experimental physics due to its balanced profile:

• Diagnostic Sensor Mounts: Used to secure Magnetic Probes and Langmuir Probes; its non-magnetic nature ensures the authenticity of magnetic field measurements without distortion.

• RF Heating System Insulators: Acts as a low-loss dielectric support in RF launchers, maintaining structural rigidity under high-frequency electromagnetic fields.

• Thermal Shield Supports: Provides a thermal insulation barrier between cryogenic superconducting magnets and high-temperature plasma regions, leveraging its low thermal conductivity (1.46 W/m·K) to minimize heat ingress.

4. Selection Guide: Why Research Institutions Prioritize Macor®?

For high-energy physics institutions in Europe and globally, the core value of Macor® lies in "Uncertainty Management":

• Rapid Iteration: Experimental designs in research are fluid. Macor® permits researchers to machine parts directly in the lab workshop using standard lathes or mills, compressing the lead time for new components from weeks (for outsourced technical ceramics) to hours.

• Parametric Consistency: Manufactured to exacting standards, Macor® offers highly consistent Coefficient of Thermal Expansion ($12.3 times 10^{-6}/°C$) and electrical properties across batches—a critical requirement for projects involving precise modeling and calibration.