Planning for the fabrication, calibration, and installation of the magnetic diagnostics for SPARC

Magnetic diagnostics are the foremost tool for understanding and controlling the magnetohydrodynamic equilibrium and stability of tokamak plasmas. Here we present the status of the plans for fabricating, calibrating, and installing the magnetic diagnostics that are being designed for the SPARC tokamak (see also Granetz et al. in this poster session). The SPARC magnetic diagnostics will include equilibrium magnetic field and flux sensors, plasma current sensors, low-m/n 3D sensor arrays, halo current sensors, and high-frequency Mirnov arrays. To emphasize sensor survivability and reliability given both the high-temperature and high-neutron-flux (but low-neutron-fluence) environment in SPARC and the limited opportunities for maintenance, most sensors will be fabricated from mineral insulated cable and joints in the leads will be minimized or avoided altogether. The status of the engineering design and the fabrication plans for the various SPARC magnetic sensors will be reported, along with the plans for both benchtop and in situ calibrations. Finally, the plans for sensor installation and as-built metrology during SPARC assembly will also be discussed.