Design, Production and First Commissioning Results of the Electrical Feedboxes of the LHC

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The Large Hadron Collider (LHC) now under commissioning at CERN is a 26.7 km collider based on several thousand high-field superconducting magnets, the majority of which operating in superfluid helium below 2 K and some isolated magnets operating in normal helium at 4.5 K. Four superconducting links (DSLs) of about 76 m in length and one of about 517 m in length, were designed, constructed and installed over a three year period. Their purpose is to transport current over long distances whenever underground LHC space constraints prevents to put power converters, current feed boxes and magnets in each others' proximity. The four 76 m long DSLs transport current between current feed boxes and several of the isolated magnets, whereas the 517 m long DSL transports current between two current feed boxes. The links are comprised of cryogenic, vacuum-insulated, transfer lines housing one or more superconducting cables. The operating temperatures are about 5 K for the DSL part that houses the cable and about 60 K for the heat shield. Their commissioning and performance results at first operational experience in the beginning of 2008 are discussed.

“…They serve as superconducting current transmission lines between current feed boxes (DFBs) [4] and accelerator magnets. DC currents are in the range of 120 A to 6000 A.…”

Section: Functional Descriptionmentioning

confidence: 99%

Commissioning and First Operation of Superconducting Links at the Large Hadron Collider (Lhc)

Weelderen¹,

Goiffon²,

Perin³

et al. 2010

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“…The schematic cryogenic layout of sector 4-5, showing the position of the cryogenic devices is shown in FIGURE 2. The LSSs always start and end with a cryogenic electrical feedbox called DFBA [3,4] that powers the arc section and also provides the mechanical and cryogenic termination to the arc. At the DFBAs the beam tubes emerge from the continuous cryostat of the arc and pass then through superconducting magnets that are installed between stretches of room temperature sections and operate in saturated liquid helium at 4.5 K. These magnets are named sequentially according to their position relative to the IP and are referred to as standalone magnets (SAM).…”

Section: Cryogenic Devices In the Lsssmentioning

confidence: 99%

“…At the DFBAs the beam tubes emerge from the continuous cryostat of the arc and pass then through superconducting magnets that are installed between stretches of room temperature sections and operate in saturated liquid helium at 4.5 K. These magnets are named sequentially according to their position relative to the IP and are referred to as standalone magnets (SAM). These magnets are powered either by local feedboxes called DFBMs [3,4] (in most LSSs) or remotely, when this first configuration is not possible (only in IP 1 and 5), through superconducting links (DSL) [3,5] of a length of 76 m. The links are themselves powered by special feedboxes: the DFBLs [3,4]. A superconducting link of a length of 517 m is also installed in IR3 where space does not allow the local installation of the power supplies for corrector magnets circuits.…”

Section: Cryogenic Devices In the Lsssmentioning

confidence: 99%

Commissioning of the Cryogenics of the LHC Long Straight Sections

Perin¹,

Casas‐Cubillos²,

Claudet³

et al. 2010

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The LHC is made of eight circular arcs interspaced with eight Long Straight Sections (LSS). Most powering interfaces to the LHC are located in these sections where the particle beams are focused and shaped for collision, cleaning and acceleration. The LSSs are constituted of several unique cryogenic devices and systems like electrical feed-boxes, standalone superconducting magnets, superconducting links, RF cavities and final focusing superconducting magnets. This paper presents the cryogenic commissioning and the main results obtained during the first operation of the LHC Long Straight Sections.

“…The electrical feed boxes [5] containing the current leads were successfully commissioned. An extensive program of liquid level gauges in-situ calibration was required to correctly and precisely control the level.…”

Section: Current Lead Coolingmentioning

confidence: 99%

Validation and Performance of the LHC Cryogenic System Through Commissioning of the First Sector

Serio¹,

Bouillot²,

Casas‐Cubillos³

et al. 2008

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The cryogenic system [1] for the Large Hadron Collider accelerator is presently in its final phase of commissioning at nominal operating conditions. The refrigeration capacity for the LHC is produced using eight large cryogenic plants and eight 1.8 K refrigeration units installed on five cryogenic islands. Machine cryogenic equipment is installed in a 26.7-km circumference ring deep underground tunnel and are maintained at their nominal operating conditions via a distribution system consisting of transfer lines, cold interconnection boxes at each cryogenic island and a cryogenic distribution line.The functional analysis of the whole system during all operating conditions was established and validated during the first sector commissioning in order to maximize the system availability. Analysis, operating modes, main failure scenarios, results and performance of the cryogenic system are presented. ABSTRACTThe cryogenic system [1] for the Large Hadron Collider accelerator is presently in its final phase of commissioning at nominal operating conditions. The refrigeration capacity for the LHC is produced using eight large cryogenic plants and eight 1.8 K refrigeration units installed on five cryogenic islands. Machine cryogenic equipment is installed in a 26.7-km circumference ring deep underground tunnel and are maintained at their nominal operating conditions via a distribution system consisting of transfer lines, cold interconnection boxes at each cryogenic island and a cryogenic distribution line.The functional analysis of the whole system during all operating conditions was established and validated during the first sector commissioning in order to maximize the system availability. Analysis, operating modes, main failure scenarios, results and performance of the cryogenic system are presented.