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KEK Photon Factory is developing a Nb_3 Sn superconducting multipole wiggler (SC-MPW) for a next generation light source ring. The test coil unit has three round Nb_3 Sn coils and works as a three-pole wiggler. Nb_3 Sn superconductivity is strain sensitive, and training of resin impregnated Nb_3 Sn magnets could be limited by wire motion or cracks of the resin. Thus, it is important to monitor strain variation during cooling and excitation processes. Following the Unit 1 [1], we conducted an excitation test of the Unit 2 at the current density of 378 A/mm². In this test, one of the purposes is to validate a new strain measurement system that was first introduced into the Unit 2. Multiple strain gauges were attached to the magnet for monitoring strain variation. The strain measurement points were determined by ANSYS-FEM simulation. We also compared the simulation results with the measured values to assess our FEM model. In the future, we plan to conduct excitation tests at the target current density of 1000 A/mm², In the test, the strain-monitoring system will be implemented to the quench detection. We will report on the test results of the Unit 2 and progress of the next excitation test.
[1] C. Mitsuda, et al.: Proc. IPACʼ25, Taipei, Taiwan Aug.(2025) p.1851-1854
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