Speaker
Description
Residual magnetization of ferromagnetic coldmass components located near superconducting RF (SRF) cavities poses a significant threat to cavity performance, especially when a magnetic source, such as a focusing lens, is in close proximity. Previous work evaluated several passive mitigation techniques, including the use of local magnetic shields, and quantified both the residual fields induced by the focusing lenses and their detrimental impact on SRF cavity performance. Building on those findings, this paper presents the development and preliminary validation of an active demagnetization procedure to mitigate such effects. Using a dedicated magnet test stand equipped with a superconducting magnet, comprising a solenoid and four dipole correctors, and multiple fluxgate sensors, we explored demagnetization cycles with varying amplitudes and polarities. Initial results demonstrate a measurable reduction in remanent magnetic fields after the application of bidirectional ramp cycles. These findings pave the way for implementing robust in-situ demagnetization procedures as a complementary approach to passive magnetic hygiene and material selection strategies.
Funding Agency
WORK SUPPORTED BY FERMI RESEARCH ALLIANCE, LLC UNDER
CONTRACT NO. DEAC02- 07CH11359 WITH THE UNITED
STATES DEPARTMENT OF ENERGY, OFFICE OF SCIENCE, OFFICE
OF HIGH ENERGY PHYSICS.
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