DFBX boxes - electrical and cryogenic distribution boxes for the superconducting magnets in the LHC straight sections

Zbasnik, J.; Corradi, Carol A.; Gourlay, S.A.; Green, M.A.; Hafalia, A.Q.; Kajiyama, Y.; Knolls, Michael J.; LaMantia, Roberto F.; Rasson, J.; Reavill, D.; Turner, W. C.

doi:10.1109/tasc.2003.812943

Cited by 6 publications

(10 citation statements)

References 1 publication

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“…The current leads are gas cooled devices designed to transfer high currents with limited transmission of heat to the 4.5 K liquid helium in which the busbars are immersed [1]. The types of DFBs and the types of current leads and their respective number for each type of DFB are listed in Table 1.…”

Section: Cryogenic Electrical Feedboxesmentioning

confidence: 99%

“…Most magnets are installed in 8 continuous strings of magnets in the arc regions of LHC, but a certain number of superconducting magnets are also required between the arcs, in the long straight sections and in the final focusing regions of the LHC (inner triplets), close to the main experimental areas. CERN will supply 16 cryogenic electrical feedboxes (DFBAs) for the arcs and 28 feedboxes for the long straight sections (DFBMs and DFBLs) while the 8 feedboxes for the inner triplets (DFBXs) will be supplied in the framework of the US-LHC collaboration and are described by Zbasnik et al [1].…”

Section: Introductionmentioning

confidence: 99%

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Conceptual design of the Cryogenic Electrical Feedboxes and the Superconducting Links of LHC

Goiffon

Lyngaa

Metral

et al. 2005

Proceedings of the Twentieth International Cryogenic Engineering Conference (ICEC20)

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Powering the superconducting magnets of the LHC arcs and long straight sections is performed with more than 1000 electrical terminals supplying currents ranging from 120 A to 13'000 A and distributed in 44 cryogenic electrical feedboxes (DFB). Where space in the LHC tunnel is sufficient, the magnets are powered by locally installed cryogenic electrical feedboxes. Where there is no space for a DFB, the current will be supplied to the magnets by superconducting links (DSL) connecting the DFBs to the magnets on distances varying from 76 m to 510 m. Conceptual design of the Cryogenic Electrical Feedboxes and the Superconducting Links of LHCGoiffon T. , Lyngaa J., Metral L., Perin A. , Trilhe P., van Weelderen R. AT Department, CERN, CH-1211 Geneva 23Powering the superconducting magnets of the LHC arcs and long straight sections is performed with more than 1000 electrical terminals supplying currents ranging from 120 A to 13'000 A and distributed in 44 cryogenic electrical feedboxes (DFB). Where space in the LHC tunnel is sufficient, the magnets are powered by locally installed cryogenic electrical feedboxes. Where there is no space for a DFB, the current will be supplied to the magnets by superconducting links (DSL) connecting the DFBs to the magnets on distances varying from 76 m to 510 m.

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Section: Cryogenic Electrical Feedboxesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Conceptual design of the Cryogenic Electrical Feedboxes and the Superconducting Links of LHC

Goiffon

Lyngaa

Metral

et al. 2005

Proceedings of the Twentieth International Cryogenic Engineering Conference (ICEC20)

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“…The 600 A and 120 A circuits of the inner triplet magnets of the Large Hadron Collider are powered by resistive gas cooled current leads [1,2].The gas flow through theses leads is controlled by an indirect temperature measurement which induce severe limitations in the operating parameters of these circuits, in particular during the current variation phases. In addition to these limitations, the temperature sensors used for the regulation are located in a difficult to access and irradiated area.…”

Section: Introductionmentioning

confidence: 99%

Upgrade of the gas flow control system of the resistive current leads of the LHC inner triplet magnets: Simulation and experimental validation

Perin¹,

Almeida²,

Casas‐Cubillos³

et al. 2014

AIP Conference Proceedings

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Abstract. The 600 A and 120 A circuits of the inner triplet magnets of the Large Hadron Collider are powered by resistive gas cooled current leads. The current solution for controlling the gas flow of these leads has shown severe operability limitations. In order to allow a more precise and more reliable control of the cooling gas flow, new flowmeters will be installed during the first long shutdown of the LHC. Because of the high level of radiation in the area next to the current leads, the flowmeters will be installed in shielded areas located up to 50 m away from the current leads. The control valves being located next to the current leads, this configuration leads to long piping between the valves and the flowmeters. In order to determine its dynamic behaviour, the proposed system was simulated with a numerical model and validated with experimental measurements performed on a dedicated test bench.

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“…The superconducting magnets of the Large Hadron Collider (LHC) are powered by more than 1400 gas cooled current leads installed in cryogenic electrical feedboxes installed around the accelerator [1,2]. TABLE 1 lists the types and the number of current leads found in the LHC [3,4,5].…”

Section: Introductionmentioning

confidence: 99%

Operational experience and consolidations for the current lead control valves of the large hadron collider

Perin¹,

Brodzinski²,

Pirotte³

et al. 2012

AIP Conference Proceedings

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The Large Hadron Collider superconducting magnets are powered by more than 1400 gas cooled current leads ranging from 120 A to 13000 A. The gas flow required by the leads is controlled by solenoid proportional valves with dimensions from DN 1.8 mm to DN 10 mm. During the first months of operation, signs of premature wear were found in the active parts of the valves. This created major problems for the functioning of the current leads threatening the availability of the LHC. Following the detection of the problems, a series of measures were implemented to keep the LHC running, to launch a development program to solve the premature wear problem and to prepare for a global consolidation of the gas flow control system. This article describes first the difficulties encountered and the measures taken to ensure a continuous operation of the LHC during the first year of operation. The development of new friction free valves is then presented along with the consolidation program and the test equipment developed to validate the upgraded valves prior to their installation into the LHC.

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DFBX boxes - electrical and cryogenic distribution boxes for the superconducting magnets in the LHC straight sections

Cited by 6 publications

References 1 publication

Conceptual design of the Cryogenic Electrical Feedboxes and the Superconducting Links of LHC

Conceptual design of the Cryogenic Electrical Feedboxes and the Superconducting Links of LHC

Upgrade of the gas flow control system of the resistive current leads of the LHC inner triplet magnets: Simulation and experimental validation

Operational experience and consolidations for the current lead control valves of the large hadron collider

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