The accurate estimation of the quaternion vector is critical for ultimate user heading estimation, since it may directly affect the acceleration signal extraction in the horizontal plane and the ultimate global walking direction extraction by PCA.
The ion source adopted two-stage source acceleration, delayed extraction and dynamic pulse focusing technique.
This is because the multi-feature fusion location algorithm using multi-feature extraction acceleration and different dimensions of feature fusion estimation moving trajectory of the target object not only reduces the processing time but also the computational complexity and the positioning method, so that the positioning acceleration effect is very obvious.
Mass analyses were performed in the linear mode with delayed, positive ion delayed extraction (acceleration voltage: 20 kV) on an AXIMA Confidence (Shimadzu Europe, Duisburg, Germany) mass spectrometer equipped with a nitrogen laser (λ = 337 nm).
A four-grid accelerator, which separates the extraction and acceleration of the ion beam, is used in this design to generate the high-energy ion beam from 10 keV to 60 keV at a working pressure of 10−4 Torr.
The SINGle Aperture SINgle GAP (SINGAP) accelerator for ITER neutral beam injector foresees four grids for the extraction and acceleration of negative ions, instead of the seven grids of the Multi-Aperture Multi-Grid (MAMuG) reference configuration.
Fig. 6 a Schematic representation of the ion trap with the extraction and acceleration electrodes labeled E1-E5.
Ion extraction and acceleration potentials are applied by fast high-voltage switches (Behlke HTS 61-01-HB-C) with a 10-90 % rise time of ∼ 70 ns.
The analysis process was proved to be useful for adjusting the GG aperture displacement and ion source parameters (acceleration gap length gacc, extraction voltage Vext, etc).
In order to extend the pulse length of such high power density beams, the extraction and acceleration geometries were tuned to match the beam optics to high power density by increasing the transmission at the extractor and the acceleration electric field at the first acceleration gap.
