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Description
The Einstein Probe Satellite is a mission of the Chinese Academy of Sciences to explore all-sky transient X-ray sources and constantly various X-ray sources, which is planned for launch around end of 2022[1]. It will carry a Wide-field X-ray Telescope (WXT) with a large instantaneous FoV and a Follow-up X-ray Telescope (FXT) with a large effective area and a narrow field-of-view. It is dedicated to time-domain astronomy to monitor the sky in the soft X-ray band (0.5–4 keV). For the WXT, it is a key issue to remove the effect of electrons with the energy below 1 Mev out of the beam.
A Permanent Magnet Diverter (PMD) was designed and fabricated to accommodate the WXT and separate the background electrons from the x-ray detecting system by re-directing the electrons. In order to minimize the magnetic flux leakage and the magnetic moment, a design of toroidal magnetic field was considered through arranging the neodymium iron boron permanent magnet blocks appropriately, which could also help reduce the length of electrons deflecting paths when passing the magnetic field. The total weight was also taken into considerations to optimize the structure of PMD. The eigenfrequency, magnetic field shift, deformations and stresses due to the steady accelerations, vibration, shock and temperature change were analyzed, and the motion of electrons in the PMD was tracked and compared for different energies to help improve the structure of PMD. The design, fabrication, and test of the PMD will be presented detailed in the paper.
