Baseline Design of a 16 T $\cos \theta$ Bending Dipole for the Future Circular Collider

Valente, Riccardo; Bellomo, G.; Caiffi, B.; Fabbricatore, P.; Farinon, S.; Mariotto, Samuele; Pampaloni, Alessandra; Ricci, Alessandro; Sorbi, M.; Statera, M.

doi:10.1109/tasc.2019.2901604

Cited by 21 publications

(10 citation statements)

References 12 publications

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“…The degradation of the conductor performance due to stress is a parameter with a profound impact on the magnet design. In the frame of the European project EuroCirCol, four options are being studied for the dipoles of the FCC: cos-theta [13], block-type [14], common-coil [15] and canted cos-theta [16]. All present designs entail peak stresses in the 150-200 MPa range on the Nb3Sn Rutherford cables.…”

Section: Introductionmentioning

confidence: 99%

Determination of the electromechanical limits of high-performance Nb3Sn Rutherford cables under transverse stress from a single-wire experiment

Gamperle

Ferradas

Barth

et al. 2020

Phys. Rev. Research

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The development of high-field accelerator magnets capable of providing 16 T dipolar fields is an indispensable technological breakthrough needed for the 100 TeV energy-frontier targeted by the Future Circular Collider (FCC). As these magnets will be based on Nb3Sn Rutherford cables, the degradation of the conductor performance due to the large electro-magnetic stresses becomes a parameter with a profound impact on the magnet design. In this work, we investigated the stress dependence and the irreversible reduction of the critical current under compressive transverse load in high performance Powder-In-Tube (PIT) Nb3Sn wires. Tests were performed in magnetic fields ranging between 16 T and 19 T on wires that were resin-impregnated similarly to the wires in the Rutherford cables of accelerator magnets. The scope was to predict the degradation of the cable under stress from a single-wire experiment. Interestingly, the irreversible stress limit, irr, defined as the stress level corresponding to a permanent reduction of the critical current by 5% with respect to its initial value, was found to depend on the applied magnetic field. This observation allowed us to shed light on the mechanism dominating the irreversible reduction of the wire performance and to compare and reconcile our results with the irreversible limits measured on Rutherford cables, typically tested at fields below 12 T.

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Section: Introductionmentioning

confidence: 99%

Determination of the electromechanical limits of high-performance Nb3Sn Rutherford cables under transverse stress from a single-wire experiment

Gamperle

Ferradas

Barth

et al. 2020

Phys. Rev. Research

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“…Cos-theta [11], block type [12], common-coil [13], canted-cos theta (CCT) [14], [15] and cos-theta magnets with stress management [16] are being studied as design options for twinaperture dipole magnets accessing the 16 T field range. The electromagnetic design of the different design options is shown in Fig.…”

Section: Magnet Designmentioning

confidence: 99%

The 16 T Dipole Development Program for FCC and HE-LHC

Schoerling

Arbelaez

Auchmann

et al. 2019

IEEE Trans. Appl. Supercond.

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A future circular collider (FCC) with a center-ofmass energy of 100 TeV and a circumference of around 100 km, or an energy upgrade of the LHC (HE-LHC) to 27 TeV require bending magnets providing 16 T in a 50-mm aperture. Several development programs for these magnets, based on Nb 3 Sn technology, are being pursued in Europe and in the U.S. In these programs, cos-theta, block-type, common-coil, and canted-costheta magnets are ex-plored; first model magnets are under manufacture; limits on con-ductor stress levels are studied; and a conductor with enhanced characteristics is developed. This paper summarizes and discusses the status, plans, and preliminary results of these programs.

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“…These programs are tackling the main R&D issues in preparation for the large use of high-field Nb 3 Sn magnets in a particle accelerator, from conductor development to the training performance and design options. Block type (Felice et al 2019), common coil (Toral et al 2018), cos-theta (Valente et al 2018;Zlobin et al 2018), and canted cos-theta (Caspi et al 2017;Montenero et al 2019) are being studied as design options for twin-aperture dipole magnets accessing the 16 T field range. As a magnet's cost is heavily dependent on the amount of conductor used, for a large number of magnets the cos-theta and block coil options would be preferable because, for the same margin on the load line, they are more efficient than the other two options.…”

Section: Present Development Programsmentioning

confidence: 99%