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Compact magnetic shields protect sensitive beam current transformers from stray fields in particle accelerators. These effective shields are crucial for accurate measurements in facilities like IFMIF-EVEDA and FAIR.

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Area of Science:

  • Particle Accelerator Physics
  • Electromagnetism
  • Materials Science

Background:

  • Beam current transformers (BCTs) are susceptible to saturation from stray magnetic fields generated by solenoids, quadrupoles, and RFQ structures.
  • Accurate beam current measurements are vital for accelerator operation and research.
  • Limited space in accelerator beamlines necessitates compact shielding solutions.

Purpose of the Study:

  • To develop and describe compact, effective magnetic shielding for BCTs in particle accelerator environments.
  • To ensure BCTs maintain functionality and accuracy despite high external stray fields.
  • To present measurement data validating the shielding performance.

Main Methods:

  • Design and fabrication of concatenated magnetic shields tailored for specific accelerator components (IFMIF-EVEDA LIPAc LEBT/MEBT, FAIR Proton Linac).
  • Analysis of magnetic field distribution and shielding material properties.
  • Experimental validation of shield effectiveness through measurements on the SILHI source.

Main Results:

  • The developed compact concatenated magnetic shields effectively protect ACCT Current Transformers from radial external fields exceeding 37 mT.
  • Shielding performance was validated through measurements at Saclay.
  • The shields are designed to fit within the constrained space along the beam pipe.

Conclusions:

  • Compact, effective magnetic shielding is achievable and essential for protecting beam current transformers in high-stray-field accelerator environments.
  • The described shielding techniques are applicable to various accelerator projects, including IFMIF-EVEDA and FAIR.
  • Understanding field distribution and material properties is key to designing successful magnetic shields.