Development of a 10 T Nb3Sn “Twin Aperture” Model Dipole Magnet for the CERN LHC

Kate, H. Ten; Daum, C.; Klundert, L.J.M. van de; Bode, H.; Hoogland, W.; Elen, J.D.; Overbeeke, F. van; Perin, R.

doi:10.1007/978-94-009-0769-0_10

Cited by 5 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the MSUT program the optimisation has not been carried out due to time constraints. More details of the electromagnetic and mechanical design of the MSUT magnet are described elsewhere [6], [7], [8].…”

mentioning

confidence: 99%

Application of Nb/sub 3/Sn superconductors in high-field accelerator magnets

Ouden

Wessel

Krooshoop

et al. 1997

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

-Last year a record central field of 11 T at first excitation at 4.4 K has been achieved with the experimental LHC model dipole magnet MSUT by utilising a high J , powderin-tube Nb3Sn conductor. This is the first real breakthrough towards fields well above 10 T at 4 K. The clear influence of magnetisation and coupling currents on the field quality, the quench behaviour and the temperature development in the coils has been measured and is discussed. For application in highfield accelerator magnets (10-15 T dipoles, 300-400 T/m quadrupoles) these experimental results clearly reveal the potential, the present limitations and the necessary improvements of Nb,Sn technology with respect to strand, cable and coil design and manufacturing. A brief review of developments in this field is presented. The focus is on accelerator dipole magnets but the key issues for quadrupole magnets are quite similar On strand and cable level the key issues comprise the reduction of I,. due to cabling (Silament damage), transverse stress sensitivity of .Ic, the istill existing controversy of a high J,. versus filament size, heat resistant and thermally conductive electrical insulation, control of the interstrand crossing and adjacent resistances R,. and R,, in relation to the thermal and electrical stability and the low normal zone propagation.To illustrate the present status and the potential of Nb3Sn accelerator magnets, the experimental results of the successful program to realise a 1 meter 11 T single aperture Nb$n dipole magnet MSUT are discussed. In this program the emphasis has been put on the main challenge, namely to increase the field strength by exploiting the high J, of the powder-in-tube Nb3Sn conductor [4] and developing Nb3Sn dedicated design and manufacturing concepts. I. INTRODUCTION 11. MSUT SYSTIEM CHARACTERISTICS The development of accelerator magnets (dipoles and quadrupoles) is focused on high-field strength c.q. high current density, field quality (normalised higher order muItipoles < I 0-4), reliable operation (mechanical and thermal stability) and high quality large scale production. The present practical field limit for NbTi magnets operating at 2 K amounts to about 8.5 T. The relation between design and manufacturing parameters and the quench behaviour (location, ageing and thermal cycling effects, thermal or mechanical limitations) is not well understood yet [ I], which impedes large scale production. The amplitude and the time dependent behaviour of the undesired higher order multipoles as well as the ramp rate sensitivity can be described quite well by modelling the interstrand coupling currents and the boundary induced coupling currents [2]. The necessary control of these currents and the consequences for cable stability is still under investigation [3].To attain a field of 10-15 T presently only Nb3Sn conductors, operating at 4.4 K, are available in satisfactory quality and quantity. Apart Srom the general issues concerning highfield accelerator magnets mentioned above, typical Nb3Sn related diffic...

show abstract

mentioning

confidence: 99%

Application of Nb/sub 3/Sn superconductors in high-field accelerator magnets

Ouden

Wessel

Krooshoop

et al. 1997

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

show abstract

“…The management of thermal contractions and dilatations (from 1.9 K during magnet operation to 650º C during coil reaction) of the different magnet components is one of the main challenges of the Nb3Sn technology; they scale with the magnet length. One-meter-long models were built since the 90's [25,26]. In 2008, LARP successfully proved the technology up to 3.4-m-long coils [27].…”

Section: B Lengthmentioning

confidence: 99%

Progress on HL-LHC Nb₃Sn Magnets

Todesco

Annarella

Ambrosio

et al. 2018

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

The HL-LHC project aims at allowing to increase the collisions in the Large Hadron Collider by a factor ten in the decade 2025-2035. One essential element are the superconducting magnets around the interaction region points, where large aperture magnets will be installed to allow to further reduce the beam size in the interaction point. The core of this upgrade is the Nb3Sn triplet, made of 150 mm aperture quadrupoles of in the range of 7-8 m. The project is being shared between CERN and US Accelerator Upgrade Program, based on the same design, and on two strand technologies. The project is ending the short model phase, and entering the prototype construction. We will report on the main results of the short model program, including quench performance and field quality. A second important element is the 11 T dipole that replacing a standard dipole makes space for additional collimators. The magnet is also ending the model development and entering the prototype phase. A critical point in the design of this magnet is the large current density, allowing increasing the field from 8 to 11 T with the same coil cross-section as in the LHC dipoles. This is also the first two-in-one Nb3Sn magnet developed so far. We will report the main results on the test and the critical aspects.

show abstract