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Study of Surface Field Enhancements due to Fine Structures

TUPS086. Using CST-MWS (RF). Using CST-EMS (E-Static). Rectangular Waveguide with f cutoff (TE10) = 10 GHz A small groove at the center of the E-plane Port mode computation of TE10 Hexahedral meshing with PBA Computation based on the FIT. Two parallel PEC plates with a small groove

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Study of Surface Field Enhancements due to Fine Structures

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  1. TUPS086 Using CST-MWS (RF) Using CST-EMS (E-Static) • Rectangular Waveguide with fcutoff(TE10)= 10 GHz • A small groove at the center of the E-plane • Port mode computation of TE10 • Hexahedral meshing with PBA • Computation based on the FIT • Two parallel PEC plates with a small groove • Potential difference: 1.0V • Hexahedral meshing with PBA • Computation based on the FIT (adopted) Study of Surface Field Enhancementsdue to Fine Structures ~ ~ = ~ 1000[V/m] (PEC) Tetsuo ABE High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan (PEC) (Vac) Floating Random Walk (FRW) Introduction High-gradient radio-frequency (RF) accelerating structures are linchpins of high-energy accelerators to search for new physics in particle physics. However, fine surface defects in the structures, such as burrs from machining and undulations due to crystal structures, could increase surface fields and/or surface heating, and trigger breakdown of the accelerating structures, leading to deterioration of accelerator performance. As is well known, projection tips, or similar fine structures, can dramatically increase local surface fields. On the other hand, how much is field enhancement at fine concave structures? Such structures could be made at bonding planes, e.g. of quadrant-type X-band accelerating structures for CLIC. This is a problem presented in this paper, and surface-field enhancement factors are numerically calculated with three different methods: RF- and electrostatic-field simulations based on the Finite Integration Technique (FIT) and floating random walk (FRW). This algorithm is implemented in a computer program for GPGPU written in Fortran 2003 / CUDA Fortran. • Conclusions • Field enhancements due to small grooves with round chamfers • have been computed by using CST-MWS/EMS and FRW. • - At least 20% enhancement for R=50mm round chamfers. • - Increases to 40% enhancement • as the D size increases to 25mm. • - Agreements among the three methods. • It has been demonstrated in this study that the FRW method gives high-precision calculations of local fields, and it is practical and promising because of its suitability for GPGPU computing. • This FRW method is applicable to any structure. Benchmark Test 1.0mm Schematic Diagram of FRW

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