Manufacturing of high (10 tesla) twin aperture superconducting dipole magnet for LHC

Borne, Jeck; Bouichou, D.; Leroy, D.; Thomi, W.

doi:10.1109/20.119876

Cited by 6 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the construction of an accelerator magnet the tapeinsulated NbTi/Cu windings are assembled under pressures ranging from 70-100 MPa [24][25][26][27], and then ''cured'' by heating for 2-8 h [25,26,28,29] at temperatures of 130 °C [24], 140 °C [28], 150 °C [29], 160 °C [25], 170 °C [26], or 185 °C [25]. 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].…”

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

View full text Add to dashboard Cite

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

View full text Add to dashboard Cite

“…In the construction of an accelerator magnet the tapeinsulated NbTi/Cu windings are assembled under pressures ranging from 70-100 MPa [22][23][24][25], and then 'cured' by heating for 2-8 hours [23][24][25][26][27] at temperatures of 130 [22], 140 [26], 150 [27], 160 [23], 170 [24], or 185 • C [25]. 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].…”

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.

View full text Add to dashboard Cite

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.

show abstract

“…In the construction of a typical accelerator magnet the NbTi/Cu windings are first partially potted under pressures ranging from 70 to 100 MPa [42][43][44][45], after being wrapped in kapton-and B-stage epoxy-impregnated tapes. The windings are assembled under pressure and the epoxy is then 'cured' by HT for 2-8 h [43,44,46,47] at temperatures of 130 [42], 140 [46], 150 [47], 160 [43], 170 [44], or 185°C [45]. In the case of RHIC, with an all-kapton insulation and a polyamide adhesive, a molding cure cycle to 220°C is required [48].…”

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

View full text Add to dashboard Cite

Manufacturing of high (10 tesla) twin aperture superconducting dipole magnet for LHC

Cited by 6 publications

References 0 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

Contact Info

Product

Resources

About