Abstracts Brochure - CERN

WEPLS073
WEPLS074
WEPLS075
28-Jun-06 16:00 - 18:00 WEPLS — Poster Session
estimated by the beam optics for COD correction, etc. The measured multi-pole components for these magnets, and
so on, will be also reported.
A Super Strong Adjustable Permanent Magnet Quadrupole for the Final Focus in a Linear
Collider
Y. Iwashita, T. Mihara (Kyoto ICR) M. Kumada (NIRS) C.M. Spencer
(SLAC)
354
An adjustable permanent magnet quadrupole
has been fabricated to demonstrate its
feasibility for use in the final focus of a linear
collider. The supposed requirements for
such a final focus lens are the tight stabilities of its integrated field gradient and magnetic center, plus it must have
adjustable strength. The high temperature coefficient of the permanent magnet material NEOMAX is compensated
by use of the MS-1 Fe-Ni alloy. The magnet has two concentric rings of NEOMAX. The replacement of the inner ring
with a smaller diameter one is planned in order to reach the highest gradient with the current configuration of the
quadrupole system; the system has to be scaled down in size to fit in a real linear collider final focus system. A precise
magnetic field measurement system is also under fabrication that will be able to measure the magnetic center to a
fraction of a micron.
SESAME Magnets System
In this paper the SESAME storage ring mag-
S. Varnasseri (SESAME)
net system is described. The storage ring
consists of 16 bending magnets with a maximum
field of 1.455 T and vertical gradient of 2.79 T/m, 32 focusing quadrupoles with a maximum gradient of 16.92
T/m, 32 defocusing quadrupoles with a maximum gradient of 10.23 T/m, 32 focusing sextupoles with a maximum
differential gradient of 200 T/m2 and 32 defocusing sextupoles with the maximum differential gradient of 300 T/m2.
The horizontal/vertical correctors will be embedded inside focusing/defocusing sextupoles. For the quadrupole and
sextupole, a design similar to ANKA has been adopted. The magnetic and electrical design of dipoles and correctors,
field profile and higher order multipoles optimization will be presented.
Simulation Study on Fringe Field Effects for BSNS
The Rapid Cycling Synchrotron (RCS) of the
Y. Chen (IHEP Beijing)
Beijing Spallation Neutron Source (BSNS)
employs a series of large aperture magnets.
These magnets have much extended fringe field at the ends, and the interference between the fringe field of neighbor
magnets induce unavoidable effects on the beam dynamics. These fringe field effects are quantified studied
by 3D simulations. The impact to the beam dynamics is discussed. The simulation code used in the simulation is
OPERA3D/TOSCA.