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Carbon nanotube fibers are a promising alternative to traditional materials used in accelerator beam diagnostics due to their high thermal conductivity, mechanical strength, and radiation resistance. A novel large-diameter carbon nanotube (CNT) fiber has been recently fabricated and produced based upon vacuum annealing purification. We have optimized the fabrication process to produce continuous CNT fibers (100 m) with consistent diameter (100 μm, ±5%) and enhanced tensile strength (1.8 GPa), specifically tailored for high-intensity accelerator applications. Extensive bench tests and thermal endurance evaluations were carried out at IHEP to verify the fiber’s performance under simulated beam operating conditions. The CNTF-based multi-wire scanners were subsequently developed and installed in the China Spallation Neutron Source (CSNS), enabling stable profiling of long-pulse H⁻ beams (80 MeV, 15 mA, ~600 μs). Beam test results indicate that the large-diameter CNT fibers deliver stable, reliable profile measurements with higher signal output than conventional carbon fibers. This paper details the fabrication strategy, mechanical and thermal property tests, beam test results, and the experience of successful implementation at CSNS.
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