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| THPMA010 | Structures of Quadrupole Magnet Core | quadrupole, pick-up, controls, vacuum | 640 | ||
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In general, there are two different quadrupole core designs: two pieces (up half and low half cores) and four pieces (four quarter halves). Both structures work on those quadrupole magnets in different accelerators around the world. There is no certain rule about which design is good for what machine, it is most likely defends on the engineer’s favor and the coil size. There is advantage and disadvantage for both structures. However, the disadvantage of four pieces design is rather visible. It is the goal of this paper to study those advantages and disadvantages of two types of core structure from manufacturer’s point of view and the perturbations of the magnet field.
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* Iron Dominated Electromagnets |
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| THPMA014 | Mechanical Stability of Open-type Quadrupole Magnets for a 2.5 GeV SRS (Indus-2) | quadrupole, multipole, vacuum, dipole | 646 | ||
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The open type Quadrupole magnets (Max. gradient: 16 T/m) for 2.5 GeV Indus-2 are made in C-configuration in which both of outer vertical sections of the steel are removed to take out the emerging synchrotron beam lines, in the region immediately adjacent to main dipole magnets of the ring. This induces engineering complexity relating to mechanical stability that critically controls the deviations in magnetic centre and field quality. To meet the stringent field quality requirements, the mechanical structure, which is precisely holding the magnet poles, is designed for minimum deflection at maximum gradient. The magnet is simulated with coupled field Emag-structural analysis, using ANSYS. The measurement of magnetic centre shift in prototype magnet assemblies with maximum excitation current is within 15 microns. The magnetic measurement results show that the higher order multipoles are low and not changing with excitation current. The optimized open-type Quadrupole magnet design is implemented in series production of all 32 magnets. The mechanical assembly accuracies and stability of series magnets with excitation are discussed in this paper.
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