Industrial development and engineering of a 1 meter twin-aperture superconducting dipole magnet for LHC

Israel, H.J.; Boschman, H.; Dubbeldam, Rosemary

doi:10.1109/20.119875

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…Alternatively, for the relativistic heavy ion collider (RHIC), with an all-kapton insulation and a polyamide adhesive, a molding cure cycle to 220 °C has been recommended [30]. The windings are then transferred to another fixture and locked or ''collared'' into place under room-temperature pressures (pre-stresses) of 40 MPa [24,28,31], 60 MPa [32], 70-90 MPa [28], or 70-125 MPa [26,29]. The duration (t), temperature (T), and pressure (P) of these processes influence the ICR and hence the per-cycle coupling losses.…”

Section: Preparation and Measurement Conditionsmentioning

confidence: 99%

AC loss in cored, stabrite-coated, superconducting cables in response to external compaction and variation of core thickness and width

et al. 2001

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Section: Preparation and Measurement Conditionsmentioning

confidence: 99%

AC loss in cored, stabrite-coated, superconducting cables in response to external compaction and variation of core thickness and width

et al. 2001

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“…Alternatively, for the Relativistic Heavy Ion Collider (RHIC), with an allkapton insulation and a polyamide adhesive, a moulding cure cycle to 225 • C has been developed [28]. The windings are then transferred to another fixture and locked or 'collared' into place under room-temperature pressures (pre-stresses) of 40 [22,26,29], 60 [30], 70-90 MPa [26], or 70-125 MPa [24,27]. The duration (t), temperature (T ), and pressure (P ) of these processes influence the ICR and hence the percycle coupling losses.…”

Section: Cable Sample Preparation and Measurement Techniquesmentioning

confidence: 99%

Ac loss and interstrand contact resistance in bare and coated NbTi/Cu Rutherford cables with cores

Sumption

Collings

Scanlan

et al. 2001

Supercond. Sci. Technol.

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Ac loss due to coupling currents in a Rutherford cable can be controlled by increasing the interstrand contact resistance through adjusting the level of native oxidation of the strand, coating it, or by inserting a ribbon-like core into the cable itself. In an investigation of coupling loss, magnetic and calorimetric measurements were performed on: (i) a 'reference pair' of bare and stabrite-coated uncored Rutherford cables; (ii) a series of stabrite-coated cables with cores of titanium, stainless steel, and kapton ribbon; and (iii) a series of bare-Cu cables with fixed overall thickness but with cores of successively increasing thickness. Measurements were made both with and without the release of uniaxial pressure between 'curing' and measurement and, in the former case, after reapplication of in-cryostat ('cold') pressure. The total ac loss was measured as a function of the ramp rate of a magnetic field applied in either the face-on (FO, perpendicular to the cable's broad face) or edge-on (EO) orientations. From the coupling-current loss components, standard formulae enabled the interstrand contact resistances R ⊥ (crossover) and R (side-by-side) to be determined. These were combined, for the purpose of discussion, into an effective FO-measured contact resistance, R ⊥,eff (R ⊥ , R ). It was noted that under the pressure-release measurement condition: (i) although the inclusion of a core (of any of the three materials) generally brings about a strong suppression of the FO loss, its presence at fixed cable outer dimensions causes an increase in the EO loss presumably as a result of increased side-by-side contact; (ii) increases in the core thickness, again at fixed cable size, resulted in still further increases in the side-by-side contact, and concurrent small reductions in the existing large R ⊥,eff (R ⊥ , R ). Although previously reported results had confirmed that the insertion of a core into a stabrite cable removed the cold-pressure sensitivity of its R ⊥,eff -a highly desirable outcome-it was noted that the cored-enhanced R ⊥,eff s were then much larger than the 20 or so µ called for by dipole magnet designers. With a view to correcting this problem a series of cables with reduced-width cores was proposed for future fabrication and measurement.

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“…In the case of RHIC, with an all-kapton insulation and a polyamide adhesive, a molding cure cycle to 220°C is required [48]. The windings are then transferred to another fixture and locked or 'collared' into place under room-temperature pressures (prestresses) of 40 [42,46,49], 60 [50], 70-90 MPa [46], or 70-125 MPa [44,47]. The duration (t), temperature (T), and pressure (P) of these processes influence the ICR and hence the per-cycle coupling losses.…”

Section: Typical Pressurization and Heat Treatment (Curing) Protocolsmentioning

confidence: 99%

Influence of strand surface condition on interstrand contact resistance and coupling loss in NbTi-wound Rutherford cables

Sumption¹,

Collings²,

Scanlan³

et al. 1999

Cryogenics

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Industrial development and engineering of a 1 meter twin-aperture superconducting dipole magnet for LHC

Cited by 5 publications

References 3 publications

AC loss in cored, stabrite-coated, superconducting cables in response to external compaction and variation of core thickness and width

AC loss in cored, stabrite-coated, superconducting cables in response to external compaction and variation of core thickness and width

Ac loss and interstrand contact resistance in bare and coated NbTi/Cu Rutherford cables with cores

Influence of strand surface condition on interstrand contact resistance and coupling loss in NbTi-wound Rutherford cables

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