Participants to the meeting:

Marco Breschi (UNIBO), PierLuigi Ribani (UNIBO), Claudia Salierno (UNIBO),??(UNIBO), Martina Biondi (UNIBO),Herbert De Gersem (TU Darmstadt), Dominik Moll (TU Darmstadt), Luca Bottura (CERN), Fulvio Boattini (CERN)

Fulvio presented the status of the simulations of dipole magnets performed so far by MAP, UNIBO and CERN. Energy loss in iron and conductors seems to be coherent among different calculations.

Fulvio presented his idea of having dipoles with multiple conductors but no returns at magnets' ends. The number of parallel conductors in each dipole will depend upon the number of series and parallel connected power converters. In the presentation an example is reported with eight series and eight parallels. This would allow having perfectly balanced circuits and equal current distributions in the circuits. The current continuity among different magnets is assured by the connection of the power converter bricks.

Marco commented the results obtained in the simulations performed by UNIBO where higher losses in the conductors where obtained due to the simplifying hypothesis of having concentrated copper conductors.

Fulvio reminded the importance of having parametric representations of the different models as many modifications from other technologies are to be expected. In addition simpler models will be developed and used in a global (RF-Lattice-Magnets-Power Converters) loop.

Herbert presented the new PHD student Dominik, who will work on the transient modeling of the muon accelerator resistive magnets.

Dominik will work on 2D and 3D transient simulations with the goal of refining losses computations (thanks to the 3D representation) and refining the study of the interactions between the powering system and the magnets. From the transient analysis results, Dominik will be able to provide equivalent models of the magnets, that can include the effect of eddy currents during the transients and can be used for circuital simulation. 

Actions:

As first step for Dominik, we agreed to present preliminary results of losses computation on a model provided by UNIBO where comparisons of the results can be done in order to set a common starting point. The meeting should possibly be held before the end of the year.

The characteristic of such model have been given by Marco already and are attached to this indico link.