🗊Презентация Positron Target Prototype – Current Status

Positron Target Prototype – Current Status Leo Jenner Jim Clarke, Ian Bailey Ken Davies, Andy Gallagher, Lei Zang

Overview Then Now Simulations First torque data Thermal Calibration Project plan Outstanding Issues

Eddy current modelling summary

Validation of Carmen model

Final Carmen models

The plan is still the same… Sweep in parameter space of B-Field, Rotation Speed and Immersion (1 T, 2000 rpm, 50 mm) Observation of kicks as spokes traverse field Measurement of eddy currents by torque and direct heating ( Lei ) Study of rotor-dynamics (LLNL: accelerometers)

Just waiting on: Final safety sign-off …Immersion calibration …Water and power re-connection to magnet …Cooling nozzle design and implementation I’ve still got one month…

Data taking begins shortly ! …hopefully… (I look forward to showing you around tomorrow!)

Hi Leo   The models use the Electra VL solver (not normal electra solver) the normal electra module solves for time varying electro magnetic fields the VL version models the effects of motion induced eddy currents, it does this by assigning an a velocity vector to the conducting material, it is assumed that the driving fields are stationary and the eddy are induced in the moving component, It also assumes that the geometry does not change with time,(for the wheel problem this means we cannot model the spokes). The CARMEN solver is a full transient solver it allows parts on the mesh to rotate it solves for eddy currents induced in a conducting media by time varying fields and by motion. The solution makes no assumptions about the problem symmetry.   hope this helps   cheers jim   James Rochford Science & Technology Facilities Council Cryogenics Group, Technology Rutherford Appleton Laboratory Harwell Science and Innovation Campus Building R65 G08 Chilton, Didcot OXON OX11 0QX