DC and AC Electrical Characterization of Stacks of HTS Tapes

Ginocchio, S.; Ballarino, A.; Perini, E.; Zannella, S.

doi:10.1109/tasc.2007.899137

Cited by 7 publications

(3 citation statements)

References 3 publications

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Section: B Hts Partmentioning

confidence: 52%

HTS Current Leads: Performance Overview in Different Operating Modes

Ballarino

2007

IEEE Trans. Appl. Supercond.

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Abstract-High Temperature Superconducting (HTS) current leads have become, in the last few years, a valid choice for the powering of superconducting magnet systems. After the construction and test of more than a thousand of HTS leads for the Large Hadron Collider, with a consequent improved confidence in the long-term and large scale operation of these devices, it is being envisaged to equip several other large superconducting magnet systems with this type of lead. The approach used in the optimization and design of such leads must take into account the requirements of the electrical and cryogenic systems as well as the local environment. The paper summarizes the results of the analysis made on HTS current leads, with special attention to the optimization process to be followed in different scenarios that include both DC and pulsed operation. Case studies are also presented and discussed. The calculation of the optimum performance in the various operating conditions was made assuming a lead design of the type used for LHC.

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Section: B Hts Partmentioning

confidence: 52%

HTS Current Leads: Performance Overview in Different Operating Modes

Ballarino

2007

IEEE Trans. Appl. Supercond.

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“…Hysteresis losses in the superconductor can be calculated by simplifying the superconducting geometry of the Bi-2223 tapes in the stack with a single core ellipse and by applying the Norris formula [14]. This assumption is in good agreement with losses measured on LHC stacks [15]. In the leads, the HTS operates at For the eddy current losses in the silver-gold matrix, the dependence of the resistivity on the temperature -it decreases by a factor of about 2.5 from 77 K down to 4.2 K -would mean they have some impact at higher frequencies (about 100 mW for the GSI HTS module operating at 50 Hz).…”

Section: Hts Sectionmentioning

confidence: 54%

Large-capacity current leads

Ballarino

2008

Physica C: Superconductivity

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Feeding superconducting magnets with reliable low-loss devices is a key issue for any cryo-electrical system. Conventional or HTS current leads can be used, and cooling methods, materials, and geometries can be chosen to optimize the thermo-electrical performance of the system. The LHC magnets are powered via more than 3000 current leads transporting altogether about 3 MA of current. With thousands of leads, the LHC lead project represents today the largest project of its kind ever undertaken. Following a review of the LHC lead project, an overview of the choices that can be made for the optimization of large capacity current leads is presented. Examples are given of other leads for large scale magnet systems for which the use of HTS is being envisaged.

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“…The I c reduction due to self-field effect on tape stacks is well known [16], [17]. By means of a proper rearrangement of each stacked tape, self-field effects can be reduced; in this sense, it is important to minimize the perpendicular component of the field in the final assembly [16]. In order to get an estimate of the self-field occurring in our HTS CICC cable, we used a 2D magnetostatic model where the cable current is uniformly …”

Section: Resultsmentioning

confidence: 99%

Characterization of the Critical Current Capabilities of Commercial REBCO Coated Conductors for an HTS Cable-in-Conduit Conductor

Marzi

Celentano

Augieri

et al. 2015

IEEE Trans. Appl. Supercond.

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In 2013, the Superconductivity Laboratory at ENEA (the Italian National Agency for New Technologies, Energy, and Economica Developments) started a project aimed at using second generation (2G) High-Temperature Superconductors (HTS) tapes for the manufacture of a cable-in-conduit conductor. The considered layouts are based on a number of HTS tapes, which are arranged as five layered structures of twisted tapes wound on a helically slotted core with an external round jacket, and the conductor is designed to target 20 kA at operating conditions (T = 5 K, B = 15 T; or T = 77 K, self-field). With the commercialization of 2G HTS tapes, several options are now available on the market that can meet the ENEA cable specifications. Thus, for a sound design of the ENEA cable, a measurement campaign was launched aiming to determine the critical current, i.e., I c , of commercial tapes as a function of an external applied field (up to 12 T) at different temperatures (in the 5-77 K range). Transport measurements were performed at 77 K in the high-field region, whereas the low-field and low-temperature critical currents have been determined from magnetization loops measured with a vibrating sample magnetometer system. Within a COMSOL Multiphysics environment, a 2-D finite-element method (FEM) magnetostatic model has been developed, in which a uniform I c distribution is assumed in the HTS stacks. Both the experimental and FEM results are discussed in terms of cable performance, showing that current commercial tapes can already meet the ENEA cable specifications at T = 5 K, B = 15 T.Index Terms-Cable-in-conduit-conductor (CICC), High temperature superconductor (HTS) coated conductor, superconducting cable, transport properties, 2D FEM magnetostatic model.

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DC and AC Electrical Characterization of Stacks of HTS Tapes

Cited by 7 publications

References 3 publications

HTS Current Leads: Performance Overview in Different Operating Modes

HTS Current Leads: Performance Overview in Different Operating Modes

Large-capacity current leads

Characterization of the Critical Current Capabilities of Commercial REBCO Coated Conductors for an HTS Cable-in-Conduit Conductor

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