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MOA3OR2
The Inductive Coupling of the Magnets in MICE and its
Effect on Quench Protection
M.A. Green, LBNL; H. Witte, Oxford University Physics
Department.
The quench protection methods that result in safe
quenching of the MICE focusing and coupling magnets are
discussed The inductive coupling of various MICE magnets
with the other magnets in the MICE is described. The
consequences of this coupling on magnet charging and
quenching are discussed. Calculations of the quenching of
a magnet due quench back from circulating currents
induced in the magnet mandrel due to quenching of an
adjacent magnet are discussed. The conclusion of this
report describes how the MICE magnet channel will react
when one or magnets in that channel are quenched.
MOA3OR3
Comparison of 2-D Magnetic and Mechanical Designs
of Selected Coil Configurations for the Next European
Dipole
F. Toral, S. Sanz, CIEMAT; A. Devred, CEA-
Saclay&CERN; P. Védrine, H. Felice, CEA-Saclay; J.
Rochford, P. Loveridge, RAL; P. Fessia, CERN.
Withdrawn.
MOA3OR4
Effect of Magnetic Instabilities in Superconductor on
Nb3Sn Accelerator Magnet Performance
V.V. Kashikhin, A. Zlobin, Fermilab.
The performance of some superconducting model magnets
built and tested at Fermilab and elsewhere based on the
high-Jc state-of-the-art Nb3Sn strands suffered from
electromagnetic instabilities in the coil. These instabilities
led to a poor magnet quench performance and a significant
degradation of the magnet quench current. Detailed
theoretical and experimental studies of possible causes of
the limited magnet quench performance allowed correlating
it with the properties of superconducting strands and
cables used in the magnets and the magnet design
parameters. This paper reviews the recent progress in
Nb3Sn strand and cable instability studies and analyzes
the effect of magnetic instabilities in superconducting
strands and cables on the quench performance and field
quality of accelerator magnets of different designs. The
results are compared with the magnet test data obtained at
Fermilab and elsewhere.
MOA3OR5
Conceptual Design of the 12.5 T Superconducting
EFDA Dipole
A. Portone, E. Salpietro, EFDA-CSU Garching; L. Bottura,
CERN; P. Bruzzone, EPFL-CRPP; W. Fietz, R. Heller,
FZK; J-M. Rifflet,; CEA-Saclay; J. Lucas, F. Toral,
CIEMAT; S. Raff, ITP FZK; P. Testoni, Electrical and
Electronics Eng. Dept., University of Cagliari.
Within the framework of the European Fusion Programme
a design activity has been started in late 2004 by the EFDA
Close Support Unit at Garching (FRG) to design a 12.5 T
superconducting dipole magnet. The final goal of this
activity is to define a “minimum cost” and “minimum risk”
dipole to be built within the next 3 years by European
industries. The newly built magnet shall be hosted in one of
the existing cryogenic laboratories in the EU to test, in
particular, the full size conductor samples that shall be
produced during the ITER magnets procurement. As a
result of this study - carried out in cooperation with several
European laboratories - different concepts have been
analysed and optimised. All designs are based on the use
of high current density Nb3Sn strands (~ 2000 A/mm2 at
12 T/4.2 K). It is assumed that these strands can be cabled
either as Cable In Conduit Conductors (CICC) or as
Rutherford-type Cables (RC) and then wound as planar
racetrack, non-planar (saddle) or cosq coils. The aim of this
paper is to provide an overview of this study activity with
particular emphasis to the optimisation steps followed in
the design of each magnet concept. Four different types
are described: a planar CICC/RC-based coil, a saddle
CICC-based coil and a cosq RC-based coil. Each design is
described together with the salient optimization steps that
include electromagnetic, structure mechanic and thermohydraulic
analyses as well as different manufacturing
constraints.
MOA3OR6
Permanent Cyclotron Magnet
E. Antokhin, M. Kumada, JST/NIRS; S. Wasaka, AEC; T.
Fujisawa, NIRS; Y. Iwashita, ICR Kyoto University; S.
Matsumoo, AEC/Dokkyo University; Y. Matsuda, Osaka
Pref. University; I. Bolshakova, R. Holyaka, V. Erashok,
MSL.
Magnet for circular accelerator can be made as copper
normal conducting electromagnet or superconducting
magnet. The application of permanent magnet to the
accelerator in the past, however, was only a storage ring of
anti-proton at Fermilab. Here in this article we will report on
a design, construction and field quality of a permanent
magnet for a cyclotron application which can be used as a
isotope production such as FDG in Positron Emission
Tomography, s well as an injector of a cascaded
accelerator complex. The design energy of the cyclotron is
10 MeV. Due to an ingenious configuration of magnetic
circuit structure, a field strength can be varied from a 2.3 T
maximum field to zero. The built in switching off capability
of the magnetic field can make a field distribution
adjustment to get isochronous field easier. In order to make
a field mapping of the cyclotron magnet further efficient, a
very accurate field mapper of 48 sensors were specially
developed where a complete mapping of the magnet can
be done in 3 hours. Interleaving of particle tracking and
field shimming was done extensively. Temperature
dependence was studied carefully. All of these details will
be presented in the article.
53 MT-19 2005, Genova