Abstracts Brochure - CERN

WEPLS107
WEPLS108
WEPLS109
28-Jun-06 16:00 - 18:00 WEPLS — Poster Session
magnet production is shared between CERN and industry. This sharing is simplified due to the modular construction,
common to all twin-aperture correctors. We report on the present state of the production, and discuss some critical
details of the fabrication.
Comparative Study of Inter-strand Coupling Current Models for Accelerator Magnets
"Inter-Strand Coupling Currents" (ISCCs) contribute to field errors and losses in Rutherford-type superconducting
cables R. deinMaria, the time B. Auchmann, S. Russenschuck (CERN)
− transient regime. The field change induces eddy currents in loops formed by the superconducting
twisted strands and the resistive matrix. In the ROXIE program two models are implemented to simulate ISCCs in
a magnet cross-section: A network model uses an electric circuit to represent the geometry of the twisted strands
and their resistive contacts; an analytical model simplifies the network equations to determine an equivalent cable
magnetization from an average field sweep over the cable. The implementation of the models in ROXIE allows to
combine them with models for "Persistent Currents" and "Inter-Filament Coupling Currents". The non-linear iron
yoke can be taken into account as well. The predictions of different ISCC models with regard to losses and field
errors are compared for two design versions of the LHC main dipole. We find that as far as field quality is concerned,
the models perform equally well. As for losses, however, the analytical model cannot capture the complexity of the
problem and computes lower losses than the network model.
High Field Solenoid Magnets for Muon Cooling
R.P. Johnson, M. Alsharo’a, S.A. Kahn, M. Kuchnir, D.J. Newsham
(Muons, Inc) R.C. Gupta, R. Palmer, E. Willen (BNL)
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Magnets made with high-temperature superconducting
(HTS) coils operating at low temperatures
have the potential to produce extremely
high fields for use in beam lines and
accelerators. The specific application of interest that we are proposing is to use a very high field (of the order of
50 Tesla) solenoid to provide a very small beta region for the final stages of cooling for a muon collider. With the
commercial availability of HTS tape based on BSCCO technology with high current carrying capacity at 4.2 K, very
high field solenoid magnets should be possible. In this paper we will evaluate the technical issues associated with
building this magnet. In particular we will address how to mitigate the high Lorentz stresses associated with this
high field magnet.
Test Results of Fermilab-built Quadrupoles for the LHC Interaction Regions
M.J. Lamm, R. Bossert, J. DiMarco, SF. Feher, A. Hocker, J.S. Kerby,
A. Nobrega, I. Novitski, R. Rabehl, P. Schlabach, J. Strait, C. Sylvester,
M. Tartaglia, J. Tompkins, G. Velev, A.V. Zlobin (Fermilab)
The US-LHC Accelerator Project has recently
completed the manufacturing and testing of
the Q2 optical elements for the LHC interaction
region final focus. Each Q2 element consists
of two identical quadrupoles (MQXB)
with a dipole orbit corrector (MQXB). The Fermilab designed MQXB has a 70 mm aperture and a peak operating
gradient of 215 T/m. This paper summarizes the test results for the MQXB program with emphasis on quench
performance and alignment studies.