Measurement Principle
For the magnetic field measurement, the PWI has a Search Coil Magnetometer (SCM) [Kasaba et al. 2020a; Yagitani et al., 2020] at the end of the coilable MAST (MAST-SC) (Fig. 5e), deployed at a length of ∼4.6 m from the side panel to minimize the magnetic field contamination radiated by the spacecraft. The SCM is a compound system consisting of two low-frequency search coil sensors (LF-SC) and a dual-band search coil sensor (DB-SC). The LF-SC consists of two orthogonal search coils (α and β) in the spacecraft spin plane, and detects the magnetic fields in the frequency range from 0.1 Hz to 20 kHz. The DB-SC is a single-axis search-coil set along the spacecraft’s spin axis, and has two coils with different numbers of turns wound around the same core. With this design, the DB-SC can cover two frequency ranges: from 0.1 Hz to 20 kHz as LF-SC using DB-SC(L) and from 2.5 kHz to 640 kHz using DB-SC(H). The cooperation of these search coils allows for a wide frequency coverage from 0.1 Hz to 20 kHz for 3-axis measurements and up to 640 kHz for one-axis measurements along Z (parallel to the spacecraft’s spin axis). The signals from these sensors are received by the SC-preamp (SC-PA) (Fig. 5d) installed on the lower deck inside of the spacecraft, right next to the MAST-SC. The signals from the SC-PA are sent to the EWO over a range from 0.1 Hz to 20 kHz from the LF-SC and DB-SC(L) in 3-axis and to the SORBET over a range from 2.5 to 640 kHz from DB-SC(H) in 1-axis.
Members
- Co-Principal Investigator
- Satoshi Yagitagi (Kanazawa University, Japan)
- Lead Co-Investigator
- Fouad Sahraoui (LPP, France)