ATF Extraction Septa Magnetic Modeling with ANSYS

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Presentation transcript:

ATF Extraction Septa Magnetic Modeling with ANSYS John Amann - ILC Mechanical Engineering 3/27/07

Motivation….. Vertical emittance growth observed at ATF post extraction vs. damping ring. Orbit unknown in extraction channel from kicker to exit of extraction septa due to kicker noise interference with BPMs. No existing magnetic models/measurements available, may be held by manufacturer as proprietary.

Why Use ANSYS? Efficient and accurate model generation using SolidEdge. Powerful and flexible meshing capabilities. Current sources can be modeled in a number of ways from primitives to circuit fed conductors. Static, harmonic, and transient analysis. Results can be used for mechanical, thermal analysis.

Progress Report…. Received drawings of extraction septa A, B, C from Mark Woodley. Received drawings of beam pipes and beam line layout from Tauchi-san at ATF2 meeting at SLAC. Unfortunately no details of conductor connections at magnet ends, will need this to accurately model end effects in 3D. Drawings held by manufacturer. Created SolidEdge 3D model of extraction septum A. Created preliminary 2D ANSYS static magnetic model of extraction septum A.

Preview of 2D Static Analysis Cooling Channel Beam Axis Cu Conductor Steel Yoke

Next Steps… Complete models for extraction septa B and C. Compare ANSYS results with analytical calculations and Poisson results. B-H curve for steel yoke, as of now model uses relative permeability. Develop 3D magnetic modeling capabilities and model end effects when details of conductor become available. Get the data out to those who wish to do beam dynamics and tracking studies. Model a real existing magnet which has magnetic measurements available to check agreement with ANSYS.

Questions for End Users of ANSYS Magnetic Models ANSYS yields B and H vector components. Coordinates as of now are referenced to beam centered at (0,0). What resolution is needed? What about file format? Multipole content? What have I forgotten?