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1.
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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2.
Influence of vacuum chamber port terminations on beam coupling impedances / Flisgen, Thomas (Berlin FBI) ; Gorgi Zadeh, Shahnam (CERN) ; Gjonaj, Erion (Darmstadt, Tech. U.)
Vacuum chambers of particle accelerators are typically equipped with radio-frequency couplers. The couplers are employed to excite modes for particle acceleration, to extract the energy of higher-order modes, or for diagnostic purposes. [...]
2023 - 9 p. - Published in : Phys. Rev. Accel. Beams 26 (2023) 014601 Fulltext: PDF;
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3.
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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4.
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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5.
Impedance minimization of the CERN Super Proton Synchrotron cavities using the generalized coupled $S$-parameter method / Gorgi Zadeh, Shahnam (Rostock U.) ; Gjonaj, Erion (Darmstadt, Tech. U.) ; Flisgen, Thomas (Berlin FBI) ; Krämer, Patrick (CERN) ; Völlinger, Christine (CERN) ; van Rienen, Ursula (Rostock U.)
In the context of the Large Hadron Collider (LHC) injector upgrade, components with high contribution to the beam coupling impedance of the injector chain have to be identified and optimized to ensure the delivery of high-intensity proton beams to the LHC. The Super Proton Synchrotron (SPS) is the last accelerator in the LHC injector chain. [...]
2022 - 11 p. - Published in : Phys. Rev. Accel. Beams 25 (2022) 082001 Fulltext: PDF;
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6.
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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7.
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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8.
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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9.
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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