Effect of vane length in radial direction in magnetron
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Explanation:
capable to produce 80 kW of CW microwave power with a power conversion efficiency about 85-90%. In other work, performed by Sun-Shin Jung with colleagues [Jung et al., 2004], the analogous 3D model of the 10-vane double-strapped magnetron operating with frequency 882 MHz at voltage 6 kV, magnetic field 0.14 tesla, and anode current 0.88 A is shown of being to capable to produce 4 kW of CW microwave power with a power conversion efficiency of 75%. The following activity in this specific area of computational researches (simulations of strapped CW magnetrons operation) is connected with 3D PIC simulations of 10-vane double-strapped oven magnetron operating at frequency 2.45 GHz with output CW microwave power about 1 kW [Luginsland at al., 2004, Kim at al., 2004a , Kim at al., 2004b, Neculaes at al., 2005, Kim at al., 2007]. In this paper we present results of the 3D PIC simulations of the high-power 10-vanes double-strapped magnetron, geometrical dimensions and operational parameters of which are close to that of the CWM-75/100L California Tube Labs magnetron [Meredith, 1998]. Simulations are done by using 3D ICEPIC code developed and maintained by the Air Force Research Laboratory (AFRL/RDHE). Results of the simulations as well as developed computer model of a strapped CW magnetron can be used to analyze, modernize, and redesign any identical CW strapped magnetrons, some of which are shown in Table I. ICEPIC (Improved Concurrent Electromagnetic Particle-in-Cell) HPC (High Performance Computing) software was designed and developed at the High Power Microwave Division, AFRL’s Directed Energy Directorate for exploring various types of equipment and methods for generating High-Power Microwaves (HPM), as well as developing and testing antennas to transmit this energy to targets [Sivak and Luneke, 2007]. The code simulates from first principles (Maxwell’s equations and Lorentz force low) both electromagnetic and charged-particle dynamics of any MVED and capable of being operated on parallel architectures with shared or distributed memory. It was originally created as a 3D Cartesian geometry PIC code, but has since been extended to compute simulations in 3D cylindrical geometry as well. Detailed description of the code can be found elsewhere [Blahovec, et al., 2000]. The simulation model of the 10-vane double-strapped magnetron reflects the typical design and construction of a high- power non-relativistic strapped CW magnetron developed by John Twisleton [Twisleton, 1964]. The main parts of the simulation model are: cathode, anode block with 10 vanes, “double-ring-strapping” system, input and output ports, and electrodes connecting vanes of the anode block with output ports. The most important geometrical dimensions of the simulation model are (Figures 1 and 2) [Wynn, et al., 2004]: anode diameter 2.92 cm (1.15”), radial vane length 4.64 cm (1.25”), vane thickness 1.15 cm (0.45”), cathode diameter 1.27 cm (0.5”), and cathode length 4.83 cm (1.9”). The simulation model is built within the 3D Cartesian geometry utilizing 1.0 x 1.0 x 1.0 mm 3 perfect cubic cells, which are adequate for most design works [Greenwood, 2005]. The 0.5 x 0.5 x 0.5 mm 3 cubic cells are advisable however [Greenwood, 2005] for finalizing design of the simulation model in the case if it will be used by the industrial magnetron manufacturers for designing following generations of the CW industrial heating high-power magnetrons. The cathode has two end caps (Figure 1 (right)) preventing emitted electrons from leaking out the interaction space; the width and the radius of each cap are 0.20 cm and 1.17 cm, respectively. The anode block consists of 10 vanes (Figure 1 (left)). All vanes have two grooves, one on each side of the anode block. The “double-ring- strapping” sy
Explanation:
The most important geometrical dimensions of the simulation model are ( Figures 1 and ... Each strap has the width of 0.1 cm (in radial direction) and the height of 0.5 cm ...