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Optimization of a 600 MHz Two-Cell Slotted Waveguide Elliptical Cavity for FCC-ee / Gorgi Zadeh, Shahnam (CERN) ; Brunner, Olivier (CERN) ; Peauger, Franck (CERN) ; Syratchev, Igor (CERN)
The radio-frequency (RF) system of the future circular lepton collider (FCC-ee) must cope with different machine parameters ranging from Ampere-class operation required for the Z-peak working point to the high-gradient operation for the tt̄threshold. The Superconducting Slotted Waveguide Elliptical cavity (SWELL) concept was recently proposed as an alternative to the challenging RF baseline design of the FCC-ee [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 1323-1326 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1323-1326

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(91)

Optimization of Two-Cell Cavities for the W and H Working Points of the FCC-ee Considering Higher-Order Mode Effects / Udongwo, Sosoho-Abasi (Rostock U.) ; Calaga, Rama (CERN) ; Gorgi Zadeh, Shahnam (Rostock U.) ; van Rienen, Ursula (Rostock U.)
The lepton collider of the future circular collider (FCC-ee) aims at conducting precision measurements on the Z, W, and H bosons and the top quark. The present RF baseline considers single-cell cavities at 400 MHz for the high current Z-pole working point, four-cell 400 MHz cavities for the W and H working points, and a hybrid RF system composed of four-cell 400 MHz and five-cell 800 MHz cavities for the high energy tt working point. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 2292-2295 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.2292-2295

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(88)

HOM damping options for the Z-pole operating scenario of FCC-ee / Gorgi Zadeh, Shahnam (U. Rostock) ; Calaga, Rama (CERN) ; Flisgen, Thomas (Berlin FBI) ; van Rienen, Ursula (U. Rostock)
The Z-pole option of FCC-ee is an Ampere class machine with a beam current of 1.39 A. Due to high HOM power and strong HOM damping requirements, the present baseline of FCC-ee considers a single-cell cavity at 400 MHz. [...]
CERN-ACC-2019-154.- 2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPRB006 Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPRB006

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(78)

FCC-ee Hybrid RF Scheme / Gorgi Zadeh, Shahnam (Rostock U.) ; Calaga, Rama (CERN) ; Gerigk, Frank (CERN) ; van Rienen, Ursula (Rostock U.)
For FCC-ee, the range of beam energies and beam currents is large between each mode of operation, all scaled to an available 50 MW maximum power per beam. The two limiting scenarios for the RF system design are at low energy (45 GeV) with high beam current (1.45 A) and the highest energy (182.5 GeV) with a radiation loss reaching 8.92 GeV per turn. [...]
CERN-ACC-2018-167.- 2018 - 3 p. - Published in : 10.18429/JACoW-IPAC2018-MOPMF036 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF036

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(71)

Accelerating cavity and higher order mode coupler design for the Future Circular Collider / Gorgi Zadeh, Shahnam
CERN-THESIS-2020-358 - http://purl.uni-rostock.de/rosdok/id00003023 : Universität Rostock , 2021-05-11.

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(68)

SWELL and Other SRF Split Cavity Development / Peauger, F (CERN) ; Brunner, O (CERN) ; Garlasche, M (CERN) ; Zadeh, S Gorgi (CERN) ; Koettig, T (CERN) ; Rosaz, G (CERN) ; Syratchev, I (CERN) ; Timmins, M (CERN) ; Therasse, M (CERN) ; Venturini Delsolaro, W (CERN) et al.
An innovative superconducting cavity topology has been recently proposed at CERN. It integrates longitudinal waveguide slots crossing perpendicularly the RF surface to damp transverse higher order modes. [...]
2022 - 5 p. - Published in : JACoW LINAC 2022 (2022) 300-304 Fulltext: PDF;
In : 31st Linear Accelerator Conference (LINAC22), Liverpool, UK, 28 Aug - 2 Sep 2022, pp.300-304

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(66)

HOM Coupler Design and Optimization for the FCC-ee W Working Point / Udongwo, Sosoho-Abasi (U. Rostock) ; Calaga, Rama (CERN) ; Gorgi Zadeh, Shahnam (CERN) ; van Rienen, Ursula (U. Rostock)
A 2-cell 400 MHz superconducting radio-frequency cavity with improved damping has been designed as an alternative to the baseline 4-cell cavity for the W working point of the future circular lepton collider (FCC-ee). For this cavity, the longitudinal higher-order modes’ (HOMs) impedance stay under the beam stability threshold value. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 1230-1233 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1230-1233

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Multipactor studies for the FCC–ee superconducting swell cavities / Plaçais, Adrien (LPSC, Grenoble) ; Bouly, Frédéric (LPSC, Grenoble) ; Gómez Martínez, Yolanda (LPSC, Grenoble) ; Meyer, Manon (LPSC, Grenoble) ; Faus-Golfe, Angeles (IJCLab, Orsay) ; Peauger, Franck (CERN) ; Gorgi Zadeh, Shahnam (CERN)
The Future Circular Collider (FCC) is a project of high performance particle collider. Several accelerating cavity technologies may equip it and are currently under study. [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) WEPA179 Fulltext: document - PDF; PDF small 4 - PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPA179

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Progress and R/D challenges for FCC-ee SRF / Venturini Delsolaro, W (CERN) ; Garlasche, M (CERN) ; Peauger, F (CERN) ; Rosaz, G (CERN) ; Karpov, I (CERN) ; Zhang, L (Beijing, Inst. High Energy Phys.) ; Valente Feliciano, A M (Jefferson Lab) ; Udongwo, S A (Rostock U.) ; Bianchi, A (CERN) ; Bellini, G (CERN) et al.
The FCC-ee machines present a huge challenge for the RF systems, which need to be adapted to very diverse beam conditions going from moderate energy and high current for the Z machine to high energy and low beam current for the ttbar. This inverse scaling results naturally from a fixed budget for the synchrotron radiation, which the SRF cavities need to compensate. [...]
2023 - 13 p. - Published in : EPJ Tech. Instrum. 10 (2023) 6 Fulltext: PDF;

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Degradation and Recovery of the LHC RF Cryomodule Performance Using the Helium Processing Technique / Turaj, Katarzyna (CERN) ; Brunner, Olivier (CERN) ; Butterworth, Andrew (CERN) ; Gerigk, Frank (CERN) ; Maesen, Pierre (CERN) ; Montesinos, Eric (CERN) ; Peauger, Franck (CERN) ; Therasse, Mathieu (CERN) ; Venturini Delsolaro, Walter (CERN)
The LHC RF cryomodule "Asia" suffered an accidental influx of about 0.5 l of tunnel air during the leak checks of the pumping manifolds. The resulting risk of particle contamination was difficult to assess, and could not be excluded with certainty. [...]
2022 - 5 p. - Published in : JACoW SRF 2021 (2022) 746-750 Fulltext: PDF;
In : 20th International Conference on RF Superconductivity (SRF 2021), Online, US, 28 Jun - 2 Jul 2021, pp.746-750

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