Note: Carbon fiber composite arrow shaft as cryogenic structural support material.

Area of Science:

• Materials Science
• Cryogenics
• Mechanical Engineering

Background:

• Cryogenic environments require materials with excellent thermal insulation and structural integrity.
• Traditional materials may not meet the demanding requirements of advanced cooling systems.
• Carbon fiber composites offer a unique combination of properties suitable for extreme conditions.

Purpose of the Study:

• To evaluate the suitability of carbon fiber archery arrow shafts as structural supports in cryogenic environments.
• To measure key thermophysical and mechanical properties of the carbon fiber shafts.
• To assess the performance of a support structure built from these shafts in an adiabatic demagnetization refrigerator.

Main Methods:

• Measurement of thermal conductivity from 0.1 K to 1 K.
• Measurement of electrical resistivity at 0.2 K.
• Measurement of bending stiffness at room temperature.
• Machining of shafts to reduce thermal conductance.
• Construction of a support structure for an adiabatic demagnetization refrigerator.

Main Results:

• Low thermal conductivity, comparable to established cryogenic insulators.
• Electrical resistivity of 0.044 Ω cm at 0.2 K.
• Bending stiffness of 243 N m² at room temperature.
• Machining successfully reduced thermal resistivity and maintained stiffness.
• The support structure resulted in a calculated low heat load.

Conclusions:

• Carbon fiber archery arrow shafts are highly effective thermal insulators.
• Their structural rigidity and low thermal conductance make them suitable for cryogenic support structures.
• These shafts offer an outstanding solution for minimizing heat load in adiabatic demagnetization refrigerators.