Potential impedance reduction by REBCO-coated conductors as beam screen coating for the Future Circular Hadron Collider

Krkotić, Patrick; Tagdulang, Nikki; Calatroni, S.; O'Callaghan, J.M.; Pont, M.

doi:10.1209/0295-5075/acaac3

Cited by 5 publications

(5 citation statements)

References 18 publications

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“…Previous studies [26][27][28][29] done on REBCO-CC samples (of the same type and provider studied here) produced experimental evidence for compatibility from the RF and superconducting perspectives across the necessary temperatures, fields, and current densities. This makes them potential candidates that are currently being investigated for BS construction to be used in future accelerators [27].…”

Section: Introductionmentioning

confidence: 59%

Electron Beam Characterization of REBCO-Coated Conductors at Cryogenic Conditions

et al. 2023

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Particle accelerators with superconducting magnets operating at cryogenic temperatures use a beam screen (BS) liner that extracts heat generated by the circulating bunched charge particle beam before it can reach the magnets. The BS surface, commonly made of high–conductivity copper, provides a low impedance for beam stability reasons, low secondary electron yield (SEY) to mitigate the electron–cloud (EC) effect, and low electron–stimulated desorption yield (ESD) to limit the dynamic pressure rise due to EC. Rare–earth barium copper oxide (REBCO) high–temperature superconductors (HTSs) recently reached technical maturity, are produced as coated conductor tapes (REBCO–CCs), and will be considered for application in future colliders to decrease the BS impedance and enable operation at around 50 K, consequently relaxing the cryogenic requirements. Aside from HTS properties, industry–grade REBCO–CCs also need qualification for EC and dynamic vacuum compatibility under accelerator–like conditions. Hence, we report the SEY and ESD measured at cryogenic temperatures of 12 K under low–energy electron irradiation of 0–1.4 keV. We also verify the sample compositions and morphologies using the XPS, SEM, and EDS methods. The energy and dose dependencies of ESD are comparable to those of technical–grade metals and one sample reached SEYMAX = 1.2 after electron conditioning.

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Section: Introductionmentioning

confidence: 59%

Electron Beam Characterization of REBCO-Coated Conductors at Cryogenic Conditions

et al. 2023

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“…In particular, and differently from many other works, we put a strong focus on the analysis and improvement in the metrological characteristics. In fact, it is clear how materials characterization methods at microwave frequencies were an evolving field in the last years: these techniques had great success in the experimental investigation of the e.m. properties of matter [ 64 , 65 , 66 , 67 , 68 ], and nowadays, microwave measurements are instrumental both for the design and testing of devices and complex systems whose performances can be particularly sensitive to the so-measured quantities [ 24 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 ] and in metrology [ 77 , 78 , 79 ]. This is the general framework into which this work fits: it shows a novel configuration of a dielectric-loaded resonator, and its possible applications, with a thorough evaluation of the measurement uncertainty.…”

Section: Comparison With the State Of The Artmentioning

confidence: 99%

Design and Test of a New Dielectric-Loaded Resonator for the Accurate Characterization of Conductive and Dielectric Materials

Alimenti

Torokhtii

García

et al. 2023

Sensors

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The spread of additive manufacturing techniques in the prototyping and realization of high-frequency applications renewed the interest in the characterization of the electromagnetic properties of both dielectric and conductive materials, as well as the design of new versatile measurement techniques. In this framework, a new configuration of a dielectric-loaded resonator is presented. Its optimization, realization, and use are presented. A measurement repeatability of about one order of magnitude lower than the commonly found values (10−3 on the Q-factor and 15×10−6 on the resonance frequency, given in terms of the relative standard deviations of repeated measurements) was reached thanks to the design of a closed resonator in which the samples can be loaded without disassembling the whole measurement fixture. The uncertainty levels, the ease of use, and the versatility of the realized system make its use of potential interest in numerous scenarios.

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“…A hybrid structure made of HTS and Cu will be required to keep the magnetic field quality within specifications [3]. Extensive studies of its surface impedance at or close to the working conditions of the FCC-hh have been performed [4,5,6,7,8,9]. Recently the data obtained has been used to calculate the RW impedance of a round pipe fully coated with REBCO-CC [9].…”

Section: Introductionmentioning

confidence: 99%

“…Extensive studies of its surface impedance at or close to the working conditions of the FCC-hh have been performed [4,5,6,7,8,9]. Recently the data obtained has been used to calculate the RW impedance of a round pipe fully coated with REBCO-CC [9]. We present here an approach by calculating the beam impedance of a hybrid elliptical beam screen with varying contributions of REBCO-CC.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the impact of REBCO-coated conductors on the resistive wall impedance of the FCC-hh

Tagdulang,

Günzel,

Krkotić

et al. 2024

J. Phys.: Conf. Ser.

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The beam screen for the Future Circular hadron-hadron Collider (FCC-hh) has a baseline design based on a copper (Cu) coating. Calculations have indicated that the resistive wall impedance will be the major contributor to the beam impedance for the FCC-hh at both injection and collision and that Cu loss might be on the limit to ensure beam stability. To increase the safety margin, it is desirable to reduce the resistive wall impedance. In this contribution, we present an approach to reduce the beam impedance based on the reduction of the surface resistance of the beam screen coating by using High-Temperature Superconductors based on REBaCu3O7−x coated conductors (REBCO-CCs). These HTS-CCs have transition temperatures around 90 K, and critical current densities which are high enough even in the presence of a strong magnetic field, being therefore, good candidates to substitute Cu in the FCC-hh beam screen, which will be operating at around 50 K and under a magnetic field of 16 T. Using measured data of the surface impedance of REBCO-CCs, the beam impedance has been estimated for an elliptical beam screen with the same vertical dimension as that of the baseline design. A REBCO-CCs contribution dependence study to determine the optimum beam screen will be shown. Resistive wall impedance studies using an ellipse are a step forward towards determining the performance of the REBCO-CCs on the FCC-hh beam screen.

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Potential impedance reduction by REBCO-coated conductors as beam screen coating for the Future Circular Hadron Collider

Cited by 5 publications

References 18 publications

Electron Beam Characterization of REBCO-Coated Conductors at Cryogenic Conditions

Electron Beam Characterization of REBCO-Coated Conductors at Cryogenic Conditions

Design and Test of a New Dielectric-Loaded Resonator for the Accurate Characterization of Conductive and Dielectric Materials

Evaluation of the impact of REBCO-coated conductors on the resistive wall impedance of the FCC-hh

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