SiD Workshop Magnet DBD STATUS SLAC January 17, 2013 Wes Craddock.

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Presentation transcript:

SiD Workshop Magnet DBD STATUS SLAC January 17, 2013 Wes Craddock

Cross Section Showing Volumes

RECENT CHANGES A 3D MAGNETIC FIELD MODEL WAS COMPLETELY REVISED AND NOW HAS SUFFICIENT CONVERGENCE 3D ANALYSIS PICTURES AND RESULTS PRESENTED IN THE DBD ARE REASONABLE PREVIOUS DBD RESULTS FOR PHYSICS ANALYSIS WOULD NOT BE ADEQUATE. NEW RESULTS WOULD BE ADEQUATE THE NEW MODELING INCLUDE BARREL/DOOR SPACER PLATES BUT NOT THE CRYOSTAT AND CHIMNEY PENETRATIONS AXIAL AND VERTICAL DECENTERING FORCES ARE NOW CALCULATED

ALL 3D ANALYSIS USE EDGE ELEMENT FORMULATION. THIS REDUCES THE VECTOR POTENTIAL DOF FROM 3 TO 1. ANALYIS STARTED (DBD RESULTS) WITH 1 MILLION, MOSTLY HEXAHEDRA (Brick) ELEMENTS using a 8 GB memory PC. REFINEMENT CONTINUED WITH A 64 GB memory PC UP TO A MODEL SIZE OF 4.5 MILLION HEXAHEDRA ELEMENTS (12 million nodes) WITHOUT SUFFICIENT CONVERGENCE. PROBLEM APPEARS TO BE CREATION OF PYRAMID (degenerate hexahedra) ELEMENTS in high field and gradient volumes that transition from hexahedra to tetrahedra. THE 167 VOLUMES WERE REMESHED WITH PRIMARILY TETRAHEDRA ELEMENTS ( 6.4 M elements and 9 M nodes) WITH SATISFACTORY RESULTS. Solution time = 24 hours (still out of core). 3D ANSYS MAGNETIC ANALYSIS DEVELOPMENT

3D MAGNETIC AXIAL SPRING CONSTANT = 1870 kN/cm 2D MAGNETIC AXIAL SPRING CONSTANT = 1830 kN/cm 3D MAGNETIC VERTICAL SPRING CONSTANT = 278 kN/cm 2D MAGNETIC VERTICAL SPRING CONSTANT = 380 kN/cm 3D ANSYS MAGNETIC RESULTS cont.

Previous 1 million hexahedra mesh model

4.5 Million Elements & 12 Million Nodes (Hexahedra Mesh)

6.4 Million Elements & 9 Million Nodes (Tetrahedra Mesh)

B Field Showing Barrel/Door Gap Plates

CONCLUSIONS A PARAMETERIZED 3D MAGNETIC FIELD MODEL WAS CREATED THAT SHOULD BE SUFFICIENT FOR ENGINEERING DESIGN. This model could be easily adapted for any SiD/DID type of magnet. WOULD HAVE BEEN NICE FOR DBD: BH Curves for actual iron. Additional iron plates for required fringe field reduction. Refinement in the DID region for peak field on the DID conductor. Chimney penetrations for localized fringe fields. Input magnet force results into solenoid, DID and iron plate stress and deflection ANSYS analysis. Magnetic energy calculation. Will be available with ANSYS 15 (towards end of 2013). FUTURE ANALYSIS WAY BEYOND THE DBD: A full 3D model for horizontal decentering forces. Transient analysis to predict DID quenching of solenoid.