A. Perin

European Organization for Nuclear Research

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S. Claudet

European Organization for Nuclear Research

R. van Weelderen

European Organization for Nuclear Research

R. Flükiger

University of Geneva

B. Hensel

Friedrich-Alexander-Universität Erlangen-Nürnberg

G. Grasso

University of Catania

J.‐C. Grivel

Technical University of Denmark

G. Ferlin

European Organization for Nuclear Research

O. Pirotte

European Organization for Nuclear Research

J. Casas-Cubillos

European Organization for Nuclear Research

C. Scheuerlein

European Organization for Nuclear Research

Cooperative Institutions

European Organization for Nuclear Research

518

Fermi National Accelerator Laboratory

Centre National de la Recherche Scientifique

Brookhaven National Laboratory

Lawrence Berkeley National Laboratory

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Istituto Nazionale di Fisica Nucleare

Cockcroft Institute

University of Geneva

École Polytechnique Fédérale de Lausanne

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Study for cryogenic testing the Super-FRS magnets of FAIR in a new test facility at CERN

IOP Conference Series Materials Science and Engineering (2015)

J.H. Derking A. Perin V. Benda O. Pirotte

The Super-FRS magnets of the international Facility for Antiproton and Ion Research (FAIR) being built at GSI in Germany will be tested at a new cryogenic test facility currently under construction at CERN. During nominal operation the magnets will be cooled with liquid helium to 4.5 K. Over a period of three years in total 57 magnets will be tested of three different types. A study is performed to determine the cryogenic requirements for testing the Super-FRS magnets. The required operational parameters for the cool down, magnet test and warm up phases are determined and the results are discussed in this paper. For pre-cooling the magnets to 90 K with a rate of 1 K·h-1, a maximum cooling power of 5.6 kW is required. Cooling down the magnets further to 4.5 K and filling will be performed with LHe within 24 h. For warming up the magnets a maximum heater power of 14 kW is needed. It is concluded that the planned test facility currently under construction at CERN fulfills the cryogenic requirements for testing the Super-FRS magnets.

Cryogenics

10.1088/1757-899x/101/1/012104

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Consolidation of the LHC Superconducting Magnets and Circuits

IEEE Transactions on Applied Superconductivity (2016)

J. Ph. Tock S. Atieh D Bodart F. Bordry Nicolas Bourcey

The first Large Hadron Collider (LHC) Long Shutdown (LS1) started in February 2013. It was triggered by the need to consolidate the 13-kA splices between the superconducting magnets to allow the LHC to reach safely its design energy of 14 TeV center of mass. The Superconducting Magnets and Circuits Consolidation (SMACC) project has principally covered the consolidation of the 10170 13-kA splices but also other activities linked to the superconducting magnets such as the exchange of 18 main cryomagnets, the installation of the additional safety relief devices, the repair of known helium leaks, and other consolidation activities. All these works have been structured in a project, gathering about 280 persons. The opening of the interconnections started in April 2013 and consolidation works were completed by September 2014. This paper first describes the preparation phase with the building of the teams and the detailed planning of the operations. Then, this paper carried out is summarized, and the main results achieved are presented. Finally, it gives feedback from the worksite, namely lessons learnt and adaptations that were implemented, both from the technical and organizational points of view.

Consolidation

10.1109/tasc.2016.2528406

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Citations (7)

Correlation between the normal state resistivity and the critical current density of Ag sheathed Bi(2223) tapes

Physica C Superconductivity (1997)

G. Grasso F. Marti Y. Huang A. Perin R. Flükiger

10.1016/s0921-4534(97)01472-x

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Citations (23)

Formation and superconducting properties of the (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10-y phase in bulk samples with oxide additions and in alloyed Ag-sheathed tapes

J.‐C. Grivel G. Grasso A. Perin R. Flükiger

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Citations (3)

CONSOLIDATION OF THE LHC SUPERCONDUCTING CIRCUITS: A MAJOR STEP TOWARDS 14 TeV COLLISIONS

Conf. Proc. (2012)

F. Bertinelli F. Bordry P. Fessia R. Ostojić A. Perin

Following the incident in one of the main dipole circuits of the Large Hadron Collider (LHC) in September 2008, a detailed analysis of all magnet circuits has been performed by a dedicated task force. This analysis has revealed critical issues in the design of the 13 kA splices between the superconducting dipole and quadrupole magnets. These splices have to be consolidated before increasing the beam energy above 4 TeV and operating the LHC at 6.5-7 TeV per beam. The design of the consolidated 13 kA splices is complete and has been reviewed by an international committee of experts. Also, all other types of superconducting circuits have been thoroughly screened for potential safety issues and several important recommendations were established. They were critically assessed and the resulting actions are presented. In addition to the work on the 13 kA splices, other interventions will be performed during the first long shut-down of the LHC to consolidate globally all superconducting circuits. The associated quality control has been defined. Schedule constraints, repair production rate, available space and resources are presented as well.

Superconducting Super Collider

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Citations (13)

Cryogenic Considerations for Cooling Superconducting Links and Application to the High Luminosity Upgrade of the Large Hadron Collider (LHC)

IEEE Transactions on Applied Superconductivity (2018)

D Berkowitz Zamora S. Claudet A. Perin

Powering superconducting (SC) magnets in particle accelerators remotely through SC links allow to install the power supplies, the current leads, and the ancillary equipment away from the limited space, high radiation areas next to the magnets. Accelerator facilities with SC magnets at 4.5 K always need a significant cryogenic infrastructure; integrating the SC links with the cryogenic system requires a variety of considerations besides the thermal performance of the link's cryostat. In this paper, we describe the main factors and possible choices for cooling SC links for some selected configurations of the cryogenic infrastructure, focussing on cooling schemes applicable to the high luminosity upgrade of the LHC. The study covers SC links using NbTi or higher temperature superconductors like MgB2, interfaces for supply and recovery of the cooling fluid, hardware constraints, and flow requirements for the current leads. We compare in a parametric study the different factors in terms of equivalent refrigeration power at 4.5 K, and also present the economic implications at the refrigerator level in terms of capital and operational costs.

Cryostat

Upgrade

Cryogenics

10.1109/tasc.2018.2809609

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

Elsevier eBooks (2005)

T. Goiffon J. Lyngaa L. Metral A. Perin P. Trilhe

Conceptual design

10.1016/b978-008044559-5/50254-4

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Citations (9)

Temperature Variation of jc and Characterization of Ag/Bi(2223) Tapes

Springer eBooks (1993)

R. Flükiger B. Hensel A. Pollini J.‐C. Grivel A. Perin

Characterization

10.1007/978-4-431-68305-6_3

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Citations (3)

Densification and texturing of long Bi,Pb(2223) bars by hot rolling

Institute of Physics Publishing eBooks (1995)

A. Perin E. Wałker R. Flükiger

Long bulk Bi,Pb(2223) bars of 0.4 mm thickness, without silver sheath were produced by a rolling process with rolls heated at >800°C. A newly developed rolling machine allowed the precise control of the deformation of Bi(2223) bars with no limitation in length. Already reacted Bi,Pb(2223) samples, which can not be deformed at room temperature, could be deformed at 824°C without cracking. The resulting bars reached a density of 5.5 g/cm³. Microstructural observations and X-ray diffraction measurements were performed, showing strong texture in the deformed bars. A critical current density of 1800 A/cm² was measured for samples deformed at 824°C. This process opens a new possibility in view of the fabrication of long(>1m) bars for high current leads.

Texture (cosmology)

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A new cryogenic test facility for large superconducting devices at CERN

IOP Conference Series Materials Science and Engineering (2015)

A. Perin J.H. Derking Luigi Serio L. Stewart V. Benda

To expand CERN testing capability to superconducting devices that cannot be installed in existing test facilities because of their size and/or mass, CERN is building a new cryogenic test facility for large and heavy devices. The first devices to be tested in the facility will be the S-FRS superconducting magnets for the FAIR project that is currently under construction at the GSI Research Center in Darmstadt, Germany. The facility will include a renovated cold box with 1.2 kW at 4.5 K equivalent power with its compression system, two independent 15 kW liquid nitrogen precooling and warm-up units, as well as a dedicated cryogenic distribution system providing cooling power to three independent test benches. The article presents the main input parameters and constraints used to define the cryogenic system and its infrastructure. The chosen layout and configuration of the facility is presented and the characteristics of the main components are described.

Cryogenics

10.1088/1757-899x/101/1/012185

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Citations (2)