Development of a model superconducting helical undulator for the ILC positron source.
The helical undulator for the proposed International Linear Collider (ILC) positron source requires high-permeability steel poles and superconducting coils to meet the ILC parameters. A short-model undulator with a period of 14 mm was designed, fabricated including high-permeability steel poles, and tested in LHe. The ends of the model were designed to wind the Nb{sub 3}Sn double helix without any conductor joints. After a few quenches in the first excitation test, the current density in the coil reached 1.28 kA/mm{sup 2}, which was approximately 90% of the estimated short-sample critical current density. The periodic on-axis fields were mapped at two azimuth angles. Excluding the end fields, the standard deviation of the field amplitudes and higher harmonic coefficients for the periodic field were less than 7 x 10{sup -3} and 5 x 10{sup -3}, respectively.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 972579
- Report Number(s):
- ANL/ASD/CP-59457
- Country of Publication:
- United States
- Language:
- ENGLISH
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