Current dependence of harmonic field coefficients of 5-cm-aperture, 15-m-long SSC dipole magnet prototypes

Zhao, Y.; Akhmetov, A.A.; Anerella, M.; Bossert, R.; Bush, T.; Capone, D. W.; Carson, J.; Coombes, R.; Cottingham, J.; Delchamps, S.; Devred, A.; Marco, J.; Ganetis, G.; Garber, M.; Goodzeit, C.; Ghosh, A.; Gourlay, S.A.; Greene, A.; Gupta, R.; Hanft, R.; Jain, A.; Kahn, S.; Kelly, E.; Koska, W.; Kuchnir, M.; Kuźmiński, J.; Lamm, M.J.; Mantsch, P.; Mazur, Péter; Morgan, G.; Muratore, J.; Nah, Wansoo; Ogitsu, T.; Orris, D.; Ozelis, J.; Peterson, T.; Pewitt, E.G.; Prodell, A.; Puglisi, M.; Radusewicz, P.; Rehak, M.; Rohrer, E.P.; Royet, J.; Sampson, W.; Sanger, P.; Scanlan, R.M.; Schermer, R.; Shutt, R.; Stiening, R.; Strait, J.; Taylor, C.; Thomas, R.; Thompson, P.; Tompkins, J.; Turner, John R.; Wake, M.; Wanderer, P.; Willen, E.; Yu, Yang; Zbasnik, J.; Zheng, H.

doi:10.1109/77.233794

Cited by 9 publications

(4 citation statements)

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“…The superconducting magnets, operated in superfluid helium and forming the main part of the LHC ring, will need to be cycled in accordance to maintain the bending and focussing strength required. In particular, the main arc dipole magnets will receive the beam at the injection field of 0.54 T, and will follow its acceleration up to the nominal operating field of 8.36 T. From the experience on other superconducting accelerator magnets (Tevatron 2 , HERA 3 , RHIC 4 and SSC 5 ), and from measurements of the field quality of LHC dipole prototypes, we expect that the field quality in the ring at the low field levels needed at injection will be dominated by the contribution of the magnetization of the superconducting filaments 6 . The LHC performance will be determined by field quality at injection, hence much attention has been paid till now to the prediction and measurement of magnetization effects 7,8 .…”

Section: Introductionmentioning

confidence: 99%

Cable Magnetization Effects in the LHC Main Dipole Magnets

Bottura

Schneider

Walckiers

et al. 1998

Advances in Cryogenic Engineering

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Several short (1 m) and long (10 m) dipole models have been tested within the scope of the on-going R&D programme for LHC at CERN. We report here the results of measurements of field quality, focussing on the contribution of persistent current magnetization. We show that measurements of the dependence of allowed harmonics on magnetic field at 1.8 K can be computed with reasonable accuracy. The calculation is based on a model of the filament magnetization adjusted to fit available strand data. Low field measurements of the first allowed harmonics, sextupole and decapole, correlate satisfactorily with the filament diameter and the scaling obtained from the simulation program.Presented at CEC-ICMC'97, Portland, July 29 -August 1st, 1997 ABSTRACTSeveral short (1 m) and long (10 m) dipole models have been tested within the scope of the on-going R&D programme for LHC at CERN. We report here the results of measurements of field quality, focussing on the contribution of persistent current magnetization. We show that measurements of the dependence of allowed harmonics on magnetic field at 1.8 K can be computed with reasonable accuracy. The calculation is based on a model of the filament magnetization adjusted to fit available strand data. Low field measurements of the first allowed harmonics, sextupole and decapole, correlate satisfactorily with the filament diameter and the scaling obtained from the simulation program.

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Section: Introductionmentioning

confidence: 99%

Cable Magnetization Effects in the LHC Main Dipole Magnets

Bottura

Schneider

Walckiers

et al. 1998

Advances in Cryogenic Engineering

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“…Five of these were built by staff from the Magnet Systems Division of the Westinghouse Electric Corporation as backups for the SSC Accelerator Systems String Test (ASST). The / construction and performance of these magnets have been reported previously [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Partial lifetime test of an SSC Collider dipole

et al. 1994

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“…From Ampere's theorem, the field, B';kj(x + iy), generated by a given current-line is -56- Hence, within the coil aperture, Bt may be written where Rref is the reference radius introduced in Eq. (2), and A,,t and Bn,t are the geometric components of the (2n+l)-pole fields given by Equation (14) shows that An,t and Bn,t varies linearly as a function of It.…”

Section: Computing the Transport-current Fieldmentioning

confidence: 99%