Abstract
Combined function magnets with dipole and quadrupole components were designed and built for the Extremely Brilliant Source. These magnets are low power consumption single sided off-axis quadrupoles. The field of the magnets was optimized for particles with a curved trajectory and within an elliptical good field region. A specific moving stretched wire magnetic measurement method was developed for measuring the magnetic length of the magnets, the radius of curvature of the poles and the field multipoles. The effect of the curvature of the magnets on the field multipoles was investigated.
Highlights
The European Synchrotron Radiation Facility (ESRF), located in Grenoble, France, is a 6 GeV light source. It is engaged in an ambitious upgrade program: the Extremely Brilliant Source (EBS)
The magnetic fields of the dipole quadrupoles (DQs) magnets were computed with Radia, a 3D magnetostatic code developed at the ESRF [19,20]
It comes from a change of the EBS lattice: the gradient of the dipole quadrupole in the final lattice is 0.9% higher than the gradient used to design the magnet while the field was kept constant
Summary
The European Synchrotron Radiation Facility (ESRF), located in Grenoble, France, is a 6 GeV light source. The EBS dipole-quadrupole magnets have a unique feature of being asymmetric (Fig. 1): they generate a field gradient on the side of the quadrupole where the electrons travel, and almost no field on the other side. They produce a strong field and a weak gradient. Such magnets were built for several accelerators including light sources [7,8,9,10,11,12,13]. The lattices of most of these light sources include combined function magnets with strong quadrupole components, similar to the EBS ones. Considering the field and gap of the DQ2 magnet of the EBS, i.e., B ≈ 0.4 T and g ≈ 25 mm, the corresponding gradient is 16 T=m, far from the 31 T=m DQ2 specification. The concept of a single sided quadrupole will be introduced and the magnetic models and the optimization process will be described
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