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Title |
Other Keywords |
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| WEPKF003 |
Design of the End Magnets for the IFUSP Main Microtron
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microtron, booster, electron, linac |
1591 |
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- M.L. Lopes, A.A. Malafronte, M.N. Martins, J. Takahashi
USP/LAL, Bairro Butantan
- K.-H. Kaiser
IKP, Mainz
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The Instituto de Física da Universidade de São Paulo (IFUSP) is building a two-stage 31 MeV continuous wave (cw) racetrack microtron. In this work we describe the characteristics of the end magnets for the IFUSP main microtron. The magnets are part of the main acceleration stage, which raises the energy from 4.9 to 31 MeV. We are studying the possibility of increasing the energy up to 38 MeV, so the magnets should have approximately 2x1 m2 region of useful field. The dipoles have a 0.1410 T magnetic field and 1 part in 1000 homogeneity without correcting devices. Using a 2D magnetic field code (FEMM), we illustrate the use of homogenizing gaps with different forms and non parallel pole faces to achieve the necessary homogeneity. The use of clamps to produce reverse fields to reduce the vertical defocusing strength on the beam is also described. In order to calculate the beam trajectories and to evaluate the magnetic field homogeneity within the useful region, a 3D magnetic field software (TOSCA) was used.
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| WEPKF009 |
A Scaling Law for Predicting Snap-back in Superconducting Accelerator Magnets
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sextupole, dipole, injection, multipole |
1609 |
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- T. Pieloni, L. Bottura, S. Sanfilippo
CERN, Geneva
- G. Ambrosio, P. Bauer
Fermilab, Batavia, Illinois
- M. Haverkamp
METROLAB, Plan-les-Ouates
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The decay of the sextupole component in the bending dipoles during injection and the subsequent snap-back at particle acceleration are issues of common concern, albeit at different levels of criticality, for all superconducting colliders built (Tevatron, HERA, RHIC) or in construction (LHC) to date. The main difficulty is the correction of the relatively large and fast sextupole change during snap-back. Motivated by the above considerations, we have conducted an extended study of sextupole snap-back on two different magnet families, the Tevatron and the LHC bending dipoles, using the same measurement method. We show in this paper that it is possible to generalise all the results obtained by using a simple, exponential scaling law. Furthermore, we show that for magnets of the same family the parameters of the scaling law correlate linearly. This finding could be exploited during accelerator operation to produce accurate forecast of the snap-back correction based solely on beam-based measurements.
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| WEPKF063 |
Comparison of Three Designs of Wide Aperture Dipole for SIS300 Ring
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dipole |
1747 |
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- L. Tkachenko, I. Bogdanov, S. Kozub, A. Shcherbakov, I. Slabodchikov, V. Sytnik, V. Zubko
IHEP Protvino, Protvino, Moscow Region
- J. Kaugerts, G. Moritz
GSI, Darmstadt
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The GSI Fast-Pulsed Synchrotron Project is found now under development. The last stage of this machine is the SIS300 ring, which will use superconducting dipoles with 100-mm aperture, 6-T magnetic field amplitude and 1-T/s field ramp rate. This dipole has to posses minimal heat losses both in the coil and in the iron yoke. This article considers three designs of such dipole. The main distinction of these designs is the different thickness of stainless steel collars, which are supported the coil. The collars in the first design hold all forces arisen in the magnet. The second design needs collars only for assembly of the coil and cooling down of the magnet. An iron yoke in this design will withstand ponderomotive forces. The third design has no collars and the iron yoke will hold all forces, including preload, forces originated during cooling down and ponderomotive forces. The different mechanical, magnetic and thermal characteristics are presented and comparative analysis of these designs is carried out.
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| WEPKF065 |
Study of Thermal Stability and Quench Process of HTS Dipole
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dipole, superconductivity, simulation, superconducting-magnet |
1753 |
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- V. Zubko, I. Bogdanov, S. Kozub, A. Shcherbakov, L. Tkachenko
IHEP Protvino, Protvino, Moscow Region
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The dipole with a coil made from HTS composite on a Bi2223 basis and placed in the ferromagnetic yoke has been developed and produced in IHEP. A designed magnetic field of the dipole in 20-mm aperture is 1 T at temperature of liquid nitrogen. The numerical analysis of factors, having influence on thermal stability of the magnet, as well as the computer simulations of dipole heating during quench was carried out. An anisotropy of voltage-current characteristics of HTS tapes in a magnetic field is taken into account in calculations of quench process. The measured results of voltage-current characteristics during powering and quench of the coil are in a good agreement with the numerical calculations
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| WEPKF070 |
Design Issues for the Superconducting Magnet that goes around the Liquid Hydrogen Absorber for the Muon Ionization Cooling Experiment (MICE)
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vacuum, focusing, superconducting-magnet, radiation |
1765 |
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- M.A. Green, G. Barr, J. Cobb, W. Lau, R.S. Senanayake, H. Witte, S.Q. Yang
OXFORDphysics, Oxford, Oxon
- E. Baynham, T.W. Bradshaw, P. Drumm, Y. Ivanyushenkov, J. Rochford
CCLRC/RAL, Chilton, Didcot, Oxon
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This report describes the design issues that are associated with a superconducting focusing solenoid that goes around a liquid hydrogen absorber for the Muon Ionization Cooling Experiment (MICE) proposed for the Rutherford Appleton Laboratory. The solenoid consists of two superconducting coils that may operated at the same polarity or at opposite polarities. As a result, the coils and their support structure must be designed to carry a 300 ton inter-coil force that is forcing the coils apart along their axis. The basic design parameters for the focusing magnet are discussed. The magnet and its cryostat are designed so that the absorber can be assembled and tested before installation into the pre-tested focusing solenoid. A safety requirements for MICE dictate that the insulating vacuum for the superconducting magnet be separated from the insulating vacuum for the absorber and that both vacuum be separated from the experiment vacuum and the vacuum within adjacent RF cavities. The safety issues associated with the arrangement of the various vacuums in the MICE focusing modules are presented. The effect of magnet operation and magnet quench on the liquid hydrogen absorber is also discussed.
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