Status of the Activities on the $\hbox{Nb}_{3} \hbox{Sn}$ Dipole SMC and of the Design of the RMC

The design, fabrication, and tests of the new generation of superconducting magnets for the High Luminosity upgrade of the Large Hadron Collider (HL-LHC) require the support of an adequate sensing technology able to assure the integrity of the strainsensitive and brittle superconducting cables through the whole service life of the magnet: assembly up to 150 MPa, cool down to 1.9 K, and powering up to about 16 kA. A precise temperature monitoring is also needed, in order to guarantee the safe working condition of the superconducting cables in the power transmission lines (SC-Link) designed to feed the magnet over long distance. Fiber Bragg Grating-based temperature and strain monitoring systems have been implemented in the first SC-Link prototype and in two subscale dipole magnets and tested in the cryogenic test facility at CERN, at 30 K, 77 K, and 1.9 K.

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“…The schematic of the SMC structure is shown in Fig. 4 [13], [14] (RMC magnet takes over the same design).…”

Section: Fbgs Based Strain Monitoring For Superconducting Magnetsmentioning

confidence: 99%

Fiber Bragg Grating Cryosensors for Superconducting Accelerator Magnets

et al. 2014

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“…The two magnets take over the same design principles with a structure scale -up for RMC where bigger cable can be tested [7]. They are used as test benches for testing the Nb 3 Sn cables in the same working conditions of the magnets presently working in the LHC.…”

Section: Fiber Bragg Grating Sensors Integration and Set Upmentioning

confidence: 99%

Fiber optic cryogenic sensors for superconducting magnets and superconducting power transmission lines at CERN

et al. 2014

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The design, fabrication and tests of a new generation of superconducting magnets for the upgrade of the LHC require the support of an adequate, robust and reliable sensing technology. The use of Fiber Optic Sensors is becoming particularly challenging for applications in extreme harsh environments such as ultra-low temperatures, high electromagnetic fields and strong mechanical stresses offering perspectives for the development of technological innovations in several applied disciplines.

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“…N 2013 and 2014, two 40-strand Rod Restack Process (RRP) Rutherford cables, foreseen to be the conductor of the 11-T dipole for the LHC High Luminosity upgrade [1], have been tested at CERN in the one meter long Short Model Coil (SMC) magnet [2][3][4][5]. The RRP conductors differ in terms of insulation scheme (3*76 µm S2 or 76 µm S2 + 152 µm Mica) and heat treatment process [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…The RRP conductors differ in terms of insulation scheme (3*76 µm S2 or 76 µm S2 + 152 µm Mica) and heat treatment process [5][6][7]. It has been modified to improve the conductor stability by increasing the RRR from 90 to 130.…”

Section: Introductionmentioning

confidence: 99%

“…It has been modified to improve the conductor stability by increasing the RRR from 90 to 130. The conductor short sample limit (I ss ) slightly decreased by 1.2% [4,5]. Their performance and study of the thermodynamic behavior of impregnated Nb 3 Sn conductor during a quench is of particular interest for the design and the protection of future larger scale magnets [1].…”

Section: Introductionmentioning

confidence: 99%

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Quench Analysis of High-Current-Density Nb<sub>3</sub>Sn Conductors in Racetrack Coil Configuration

Bajas

Bajko

Bordini

et al. 2015

IEEE Trans. Appl. Supercond.

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The luminosity upgrade of the Large Hadron Collider (HL-LHC) requires the development of new type of superconducting cables based on advanced Nb3Sn strands. In the framework of the FP7 European project EUCARD the cables foreseen for the HL-LHC project have been tested recently in a simplified racetrack coil configuration, the so-called Short Model Coil (SMC). In 2013 to 2014, two SMCs wound with 40-strand (RRP 108/127) cables, with different heat treatment processes, reached during training at 1.9 K a current and peak magnetic field of 15.9 kA, 13.9T,and 14.3 kA, 12.7 Trespectively. Using the measured signals from the voltage taps, the behavior of the quenches is analyzed in terms of transverse and longitudinal propagation velocity and hot spot temperature. These measurements are compared with both analytical and numerical calculations from adiabatic models.The coherence of the results from the presented independent methods helps in estimating the relevance of the material properties and the adiabatic assumption for impregnated Nb3Sn conductor modelling.

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Status of the Activities on the $\hbox{Nb}_{3} \hbox{Sn}$ Dipole SMC and of the Design of the RMC

Cited by 16 publications

References 6 publications

Fiber Bragg Grating Cryosensors for Superconducting Accelerator Magnets

Fiber Bragg Grating Cryosensors for Superconducting Accelerator Magnets

Fiber optic cryogenic sensors for superconducting magnets and superconducting power transmission lines at CERN

Quench Analysis of High-Current-Density Nb<sub>3</sub>Sn Conductors in Racetrack Coil Configuration

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