Orateur
M.
Emmanuel Froidefond
(LPSC/IN2P3/CNRS)
Description
In the frame of the RACCAM project, the coil shaping magnet
design is studied. The
main advantages of that method are to allow to keep
horizontal tune constant and make
possible the variation of k.
A first simple model of conductors of infinite length and no
iron yoke gives a first
set of current intensities using Biot and Savart law. The
problem is then to solve
the linear system A.x-B=0. The matrix A generated is often
ill-conditionned and
requires a particular solving method based on matrix 1-norm
minimisation. It can give
satisfying results in 2d, but current intensities have to be
adjusted if the geometry
generates an ill-conditionned matrix A. With a 3d simulation
(not done yet) other
adjustments are nedeed to match the field law.
Pushing geometry investigations a bit further, one can
calculate the field generated
by a series of conductors of limited length, arc shaped and
distributed along a
spiral (the one which supports the edges of the magnet). If
arcs centers are located
at machine ring center, it appears clearly that the maximum
field of one conductor is
not always located inside the limits of the iron yoke. This
still have to be
confirmed with a 3d simulation.
Auteurs principaux
Dr
Bruno Autin
(CERN)
M.
Emmanuel Froidefond
(LPSC/IN2P3/CNRS)
