| Paper |
Title |
Other Keywords |
Page |
| TUPP105 |
Theoretical Field Analysis for Superferric Accelerator Magnets Using Elliptic Multipoles and its Advantages
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multipole, dipole, synchrotron, simulation |
1773 |
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- P. Schnizer, E. S. Fischer
GSI, Darmstadt
- P. G. Akishin
JINR, Dubna, Moscow Region
- B. Schnizer
TUG/ITP, Graz
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FAIR will build a set of accelerators and storage rings at GSI Darmstadt. Nearly all of them transport beams of elliptical shape (SIS 100, CR, NESR, RESR, SuperFRS). Magnetic field calculations as well as magnetic measurements provide precise field information, which is used to improve the properties of machine using numerical simulations. We had developed elliptical multipoles fulfilling the Laplace equation which enable us to describe the field within the whole aperture consistently. Now the representation of these has been simplified considerably as compared to earlier ones. Meanwhile we found analytical expressions to derive circular multipoles directly from the elliptic multipoles. We illustrate the advantage of this data representation on SIS 100 magnet data and show how a concise set of harmonics can be derived from rotating coil measurements.
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| WEPC138 |
Transient Electromagnetic Analysis and Thermal Design on the Magnet of 3-GeV Synchrotron
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synchrotron, proton, quadrupole, linac |
2332 |
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- M. Abe, S. Tounos
Hitachi, Ltd., Power & Industrial Systems R&D Laboratory, Ibaraki-ken
- T. Adachi
KEK, Ibaraki
- Y. Chida
Hitachi Ltd., Ibaraki-ken
- K. Nakamura, T. Watanabe
Hitachi. Ltd., Hitachi Works, Hitachi-shi
- T. Takayanagi
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- N. Tani
JAEA/LINAC, Ibaraki-ken
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J-PARC 3GeV synchrotron is operated at 25Hz alternatively, which can generate eddy currents and heat. They can disturb continuous operations. We prepared a design technique to analyze them and manage the temperature rises of the magnets. Eddy current and hysteresis heat generations were calculated with 3D models then temperature rises were evaluated with natural convection cooling from surfaces. The technique was applied on the dipole, quadrupole and bump magnets. Slits on intense eddy current position can decrease the heat generation, however deep slits can disturb magnetic field distribution. Their depth and positions were optimized for the temperature rise reduction. So far, the synchrotron operation is fair with reasonable temperature rises.
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| WEPD006 |
Conceptual Design of Superferric Magnets for PS2
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cryogenics, dipole, quadrupole, injection |
2410 |
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- L. Bottura, G. De Rijk, M. Karppinen, G. Kirby, R. Maccaferri, C. Maglioni, V. Parma, L. Rossi, W. Scandale, L. Serio, D. Tommasini
CERN, Geneva
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We analyze feasibility and cost of a superferric magnet design for the PS2, the novel 50 GeV ring that should replace the PS in the CERN injector chain. Specifically, we provide the conceptual design of dipole and quadrupoles, including considerations on cryogenics and powering. The magnets have warm iron yoke, and cryostated superconducting coils embedded in the magnet, which reduces AC loss at cryogenic temperature. The superconductor has large operating margin to endure beam loss and operating loads over a long period of time. Although conservative, and without any critical dependence on novel technology developments, this superconducting option appears to be attractive as a low-power alternative to the normal-conducting magnets that are the present baseline for the PS2 design. In addition it provides flexibility in the selection of flat-top duration at no additional cost.
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| WEPD022 |
High Field Superconductor for Muon Cooling
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collider, superconducting-magnet, beam-cooling, emittance |
2455 |
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- J. Schwartz
NHMFL, Tallahassee, Florida
- R. P. Johnson, S. A. Kahn, M. Kuchnir
Muons, Inc, Batavia
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High temperature superconductors (HTS) have been shown to carry significant current density in the presence of extremely high magnetic fields when operated at low temperature. The successful design of magnets needed for high energy physics applications using such high field superconductor (HFS) depends critically on the detailed wire or tape parameters which are still under development and not yet well-defined. In the project reported here, we are developing HFS for accelerator use by concentrating on the design of an innovative magnet that will have a useful role in muon beam cooling. Measurements of available materials and a conceptual design of a high field solenoid using YBCO HFS conductor are being analyzed with the goal of providing useful guidance to superconductor manufacturers for materials well suited to accelerator applications.
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