Can silica and ammonium sulfate be used in combination?
The requirements of the magnetic field are achieved by the selection of permanent magnetic material and the design of magnetic circuit. A magnetic field is formed in the discharge space. Permanent magnets or electromagnets can be used. Although electromagnets are tunable, we use permanent magnets in view of the size and convenience of the space usage of the ion source.
The magnetic energy provided by the permanent magnetic material is W=1/2 (BH) V, and the V in the formula is the volume of the permanent magnet. In order to obtain the required magnetic energy with the minimum magnetic volume V, the maximum (BH) product should be made so that the permanent magnetic material working on the demagnetization curve should be at its operating point (BdHd) = (BH) max. This point can be obtained by the hysteresis loop of the permanent magnet in the figure method. At this point, there should be Bd/, Hd=, Br/, Hc. Among them, Bd is working point, magnetic induction intensity, Hd is working point, magnetic field is strong, aromatic, Br is residual magnetism of permanent magnetic material, Hc is coercive force.
The ion source used in a vacuum, poor radiation efficiency, charged particles and the gas itself in ion source discharge bombarding electrode will produce large amounts of heat, therefore, the permanent magnet material of high temperature selection requirements, according to the technological requirements, hope high temperature above 350 degrees C to work.
