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Title: Preliminary Investigations of Eddy Current Effects on a Spinning Disk

Preliminary Investigations of Eddy Current Effects on a Spinning Disk The design of the positron source target for the International Linear Collider (ILC) envisions a Ti6Al4V wheel rotating in a large magnetic field (5-10 Tesla) being impacted by a photon beam to produce positrons. One of the many challenges for this system is determining how large a motor will be needed to spin the shaft. The wheel spinning in the magnetic field induces an eddy current in the wheel, which retards the spinning motion of the wheel. Earlier calculations by Mayhall [1] have shown that those eddy forces could be quite large, and resulted in the preliminary design being moved from a solid disk to a rim and spoke design, as shown in Figure 1. A series of experiments with a spinning metal disk were run at the Stanford Linear Accelerator Center (SLAC) to provide experimental validation of the Maxwell 3D simulations. This report will give a brief outline of the experimental setup and results. In addition, earlier work by Smythe [2] will be used to compare with the experimental results.
Authors: ; ;
Publication Date:
OSTI Identifier:OSTI ID: 893982
Report Number(s):UCRL-TR-224467
TRN: US0700039
DOE Contract Number:W-7405-ENG-48
Resource Type:Technical Report
Research Org:Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Sponsoring Org:USDOE
Country of Publication:United States
Language:English
Subject: 43 PARTICLE ACCELERATORS; DESIGN; EDDY CURRENTS; LINEAR COLLIDERS; MAGNETIC FIELDS; MOTORS; PHOTON BEAMS; POSITRON SOURCES; POSITRONS; SPIN; STANFORD LINEAR ACCELERATOR CENTER; TARGETS; VALIDATION; WHEELS