PAC09 - List of Authors (Neuvéglise, D.)

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Neuvéglise, D.

Paper	Title	Page
FR5REP095	An Alternative Design for the RACCAM Magnet with Distributed Conductors	5002
	D. Neuvéglise SIGMAPHI S.A., Vannes F. Méot CEA, Gif-sur-Yvette
	Funding: ANR contract nb : NT05-1₄1853 This paper presents an alternative design of the magnet for the RACCAM project. The aim of this collaboration is to study and build a prototype of a scaling spiral FFAG as a possible medical machine for hadron therapy. The magnet was first designed with a variable gap to produce the desired field law B=B₀(r/r₀)^k. The key feature in the “scaling” behavior of the magnet is in getting the fringe field extent to be proportional to the radius. Although the fringe field is increasing with gap dimension, we have obtained quit constant tunes in both horizontal and vertical by using a variable chamfer. An alternative magnet design was then proposed with parallel gap and distributed conductors on the pole to create the required field variation. This solution requires about 40 conductors along the pole and much more power than the gap shaping solution. We expect a much better tune constancy even without variable chamfer. We can think about an “hybrid” magnet with parallel gap at small radii and gap shaping afterward. Such a solution could take advantages of both solutions.

Paper

Title

Page

FR5REP095

An Alternative Design for the RACCAM Magnet with Distributed Conductors

5002

D. Neuvéglise
SIGMAPHI S.A., Vannes
F. Méot
CEA, Gif-sur-Yvette

Funding: ANR contract nb : NT05-1₄1853

This paper presents an alternative design of the magnet for the RACCAM project. The aim of this collaboration is to study and build a prototype of a scaling spiral FFAG as a possible medical machine for hadron therapy. The magnet was first designed with a variable gap to produce the desired field law B=B₀(r/r₀)^k. The key feature in the “scaling” behavior of the magnet is in getting the fringe field extent to be proportional to the radius. Although the fringe field is increasing with gap dimension, we have obtained quit constant tunes in both horizontal and vertical by using a variable chamfer. An alternative magnet design was then proposed with parallel gap and distributed conductors on the pole to create the required field variation. This solution requires about 40 conductors along the pole and much more power than the gap shaping solution. We expect a much better tune constancy even without variable chamfer. We can think about an “hybrid” magnet with parallel gap at small radii and gap shaping afterward. Such a solution could take advantages of both solutions.