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Efficient water-cooled Bitter-type electromagnet for Zeeman slowing in cold-atom experiments
1Centre for Quantum Technologies, National University of Singapore, Singapore 117543, Singapore.
Abstract:
We describe the design, construction, and characterization of a Bitter-type electromagnet that produces a spatially-dependent magnetic field used for Zeeman slowing in cold-atom experiments. The coil consists of stacked copper arcs separated by PTFE spacers of varying thicknesses, generating a near-optimal field profile using a single power supply. With an electrical resistance of 26.5(3) mΩ and self-inductance of 19.1(1) μH, our design achieves a fast electrical switching time of τ ≈ 100 μs in a compact, 30-cm-long package. Water circulating helically through holes in the copper and channels in the spacers ensures efficient thermal management, limiting the temperature rise to ∼5° C over 36 s of continuous operation at 200 A.
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