Functional requirements and busbar layout for WP 3
Functional requirements and busbar layout for WP 3 E. Todesco, R. Principe With the help of many colleagues, among them L. Bottura, H. Prin, S. Hopkins, J. Fleiter, A. Ballarino, M. Zerlauth, F. Rodriguez Mateos, Z. Charifoulline, R. Denz, A. Verweij, D. Wollmann logo area Busbar review – 14 April 2021
CONTENTS § Functional requirements and history of the circuit layout § Busbar layout § Reference document: EDMS 2029211 – version in approval since end of March, with feedbacks given by all stakeholders - Felix asked to have it released after the feedback of the review logo area -2
STRUCTURE § WP 3 organigram: EDMS 1865349 § R. Principe leads all activities related to WP 3 busbars § § § Cable procuremement with MSC-SCD J. Fleiter Integration with MSC-LMF H. Prin Protection with MPE-PE A. Verweij Detection with MPE-EP R. Denz Document about sharing of responsabilites for protection EDMS 2521131 – still iterating on some aspects, but not related to the busbar work project of this review logo area -3
FUNCTIONAL REQUIREMENTS § Functional requirements established in EDMS 2029211 since 2018 (thanks to L. Bottura): more relevant parameters § 5 K temperature margin § 100 K maximum hotspot temperature § Voltage requirements as in the magnet (see related EDMS documents) logo area -4
HISTORY OF CIRCUITS § In the LHC MQXA and MQXB are in series with a «trim» on MQXB, allowing adjusting the operational current from MQXA to MQXB § Two different designs for MQXA (7 k. A) and MQXB (12 k. A) § In HL-LHC the four magnets have the same nominal current § First version had two separate circuits, Q 1/Q 3 and Q 2 a Q 2 b § Due to a request from WP 2, bringing also some cost saving, it has been decided to go with one circuit in an early stage of the project logo area -5
HISTORY OF CIRCUITS § All discussions took place in the dedicated forum MCF Magnet Circuit Forum § In 2019 -2020 it has been decided to include diodes at 1. 9 K in the present layout (ECR EDMS 1832082) § Considerable advantage of decoupling the SC link § The option of having D 1 and D 2 in series was discarded: too complex and risky with respect to the moderate saving on power converter cost logo area -6
PRESENT CIRCUIT LAYOUT § Summarizing, one side of IP has the following circuits § One main 18 k. A of Q 1/Q 2/Q 3 plus trims § Six 2 k. A of MCBXFB/A (three nested correctors, H and V independent) § One 13 k. A of MBXF (aka D 1) § One 13 k. A of MBRD (aka D 2, two apertures in series) § Four 400 A of MCBRD (aka D 2 corrector, independent H and V and independent double apertures) logo area -7
CONTENTS § Functional requirements and history of the circuit layout § Busbar layout § Reference document: EDMS 2029211 logo area -8
TRIPLET CIRCUIT § The most complex § 2 main 18 k. A negative positive § 2 trims (plus one non connected but allowing a separate diode on Q 2 a/Q 2 b) § Protection strategy for the busbar § If the busbar quenches, the whole string of magnets are quenched via CLIQ and QH (time constant order of 0. 4 s) logo area -9
TRIPLET CIRCUIT § Nb-Ti leads § Double Rutherford cable, 34 strand, 1. 065 mm diameter, 1. 65 Cu/no. Cu § Manufactured by CERN § Internal busbars § § § Same as Nb-Ti leads, both in Q 1/Q 3 and in Q 2 a/Q 2 b Manufactured by US-AUP – protection discussed in M. Baldini, et al IEEE TAS 30 (2020) Round busbar § § § 34 strands, 1. 065 mm diameter, 1. 65 Cu/no. Cu around a Cu core of 10. 9 mm diameter To be manufactured in the industry Positive and negative of the main circuit are twisted logo area - 10
MCBXFB 2 k. A CIRCUITS § Six circuits (2 per magnet, 3 magnets) § Positive and negative current shall be possible § Protection strategy for the busbar § If the busbar quenches, the dump resistor is activated (time constant order of 1. 7 s) § Magnet leads § The same Nb-Ti cable of the magnet (18 strands, 0. 48 mm diameter, 1. 75 Cu/No_Cu) plus a 1. 5 mm thick slab of Cu same width of the cable § Round busbar § § 21 strands, 0. 825 mm diameter, 1. 95 Cu/no_Cu around a Cu core of 4. 9 mm diameter To be manufactured in the industry Assembled in bundles of 4 (two positive and two negative) twisted Goes through the N 2 line (tube welded outside the cold mass) and gets spliced in the interconnections logo area - 11
MCBXFB 2 k. A CIRCUITS § Six circuits (2 per magnet, 3 magnets) § Positive and negative current shall be possible § Protection strategy for the busbar § If the busbar quenches, the dump resistor is activated (time constant order of 1. 7 s) § Magnet leads § The same Nb-Ti cable of the magnet (18 strands, 0. 48 mm diameter, 1. 75 Cu/No_Cu) plus a 1. 5 mm thick slab of Cu same width of the cable § Round busbar § § 21 strands, 0. 825 mm diameter, 1. 95 Cu/no_Cu around a Cu core of 4. 9 mm diameter To be manufactured in the industry Assembled in bundles of 4 (two positive and two negative) twisted Goes through the N 2 line (tube welded outside the cold mass) and gets spliced in the interconnections logo area - 12
MCBXFB 2 k. A CIRCUITS § Six circuits (2 per magnet, 3 magnets) § Positive and negative current shall be possible § Protection strategy for the busbar § If the busbar quenches, the dump resistor is activated (time constant order of 1. 7 s) § Magnet leads § The same Nb-Ti cable of the magnet (18 strands, 0. 48 mm diameter, 1. 75 Cu/No_Cu) plus a 1. 5 mm thick slab of Cu same width of the cable § Round busbar § § 21 strands, 0. 825 mm diameter, 1. 95 Cu/no_Cu around a Cu core of 4. 9 mm diameter To be manufactured in the industry Assembled in bundles of 4 (two positive and two negative) twisted Goes through the N 2 line (tube welded outside the cold mass) and gets spliced in the interconnections logo area - 13
D 1 13 k. A CIRCUITS § One circuit § Protection strategy for the busbar § If the busbar quenches, the magnet is quenched via the quench heaters (time constant order of 0. 35 s) § Flat busbar – Magnet lead § Two cables of the magnet § Round busbar § The same of the 18 k. A (to standardize the plug) logo area - 14
D 2 13 k. A CIRCUITS § One circuit § Protection strategy for the busbar § If the busbar quenches, the magnet is quenched via the quench heaters (time constant order of 0. 35 s) § Round busbar § The same of the 18 k. A (to standardize the plug) logo area - 15
D 2 CORRECTOR 400 A CIRCUITS § Four circuits § Protection strategy for the busbar § If the busbar quenches, the 1. 4 W dump resistor is activated (time constant order of 0. 7 s) § Round busbar § The same of LHC 600 A busbars logo area - 16
PROCUREMENT AND TIMELINE § Procurement § Internal 18 k. A busbar: US-AUP § All magnet leads: MSC-SCD § Round busbar: procurement by MSC-SCD via industry – DR signed, this review is intended to give the go/no go for the tender – this tender is on the critical path of the string § The final validation of the busbar baseline will be done via the string § Prototype N 1 and N 2 lines, prototye DCM will be needed in the second half of 2022 for the string § For the DCM plug, for integration studies, and for splices, prototype cables already available § 18 k. A and 2 k. A round cable should be available by January 2022 for the N lines and for the DCM logo area - 17
CRITICAL PATHS § Specifications well established since 2018 § Layout has been established since 2019, with minor modifications in 2020 § A set of values for thresholds were established beginning of 2021 (see talk by R. Denz) § Validation of the protection scheme is in the final phase § Preliminary ok was given in MCF, iteration on parameters shall provide the ok for the round busbar tender (see talk by A. Verweij) § The plan for the busbar production and qualification has been prepared (see talk by J. Fleiter) § Splice work is well advanced (see talk by R. Principe) § A feedback will be needed by the protection team to discard the hypothesis of quench stoppers (ongoing work, see talk by A. Verweij) § Integration and support of the cables in the N lines is being finalized (see talk by H. Prin) logo area - 18
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