Progress and R/D challenges for FCC-ee SRF

Abstract 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 budg...
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Autor*in:	Venturini Delsolaro, W. [verfasserIn] Garlasche, M. Peauger, F. Rosaz, G. Karpov, I. Zhang, L. Valente Feliciano, A. M. Udongwo, S. A. Bianchi, A. Bellini, G. Ferrera, L. M. A. Pereira Carlos, C. Vega Cid, L. Leith, S. Proslier, T. Gorgi Zadeh, S. Timmins, M. Therasse, M. Koettig, T. Atieh, S. Brunner, O. Gerigk, F.

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	Future Circular Collider RF superconductivity Accelerating cavity

Anmerkung:	© The Author(s) 2023

Übergeordnetes Werk:	Enthalten in: EPJ Techniques and Instrumentation - Berlin : SpringerOpen, 2014, 10(2023), 1 vom: 16. März
Übergeordnetes Werk:	volume:10 ; year:2023 ; number:1 ; day:16 ; month:03

Links:	Volltext

DOI / URN:	10.1140/epjti/s40485-023-00094-5

Katalog-ID:	SPR04971645X

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allfields	10.1140/epjti/s40485-023-00094-5 doi (DE-627)SPR04971645X (SPR)s40485-023-00094-5-e DE-627 ger DE-627 rakwb eng Venturini Delsolaro, W. verfasserin aut Progress and R/D challenges for FCC-ee SRF 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2023 Abstract 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. A global solution was elaborated for the FCC Conceptual Design Report (Abada in Eur Phys J Spec Top 228):261–623, 2019), and is referred here as the baseline. Recently, further studies have led to a new optimized baseline, still based on traditional elliptical cavities. In parallel, a novel concept, named the Slotted Waveguide ELLiptical (SWELL), was proposed with the potential of greatly simplified logistics and reduced costs. Under several aspects, all these changes call for enhanced performance of the RF systems. A vigorous R&D program has therefore continued since the publication of the CDR, with the aim of pushing the performance and demonstrating the feasibility of a more advanced baseline and, more recently, of the SWELL option. The progress and challenges of this ambitious program were presented in the dedicated SRF sessions at FCC week 2022 (FCC week 2022 website, 2022, https://indico.cern.ch/event/1064327/timetable/) and are summarized in this paper. Future Circular Collider (dpeaa)DE-He213 RF superconductivity (dpeaa)DE-He213 Accelerating cavity (dpeaa)DE-He213 Garlasche, M. aut Peauger, F. aut Rosaz, G. aut Karpov, I. aut Zhang, L. aut Valente Feliciano, A. M. aut Udongwo, S. A. aut Bianchi, A. aut Bellini, G. aut Ferrera, L. M. A. aut Pereira Carlos, C. aut Vega Cid, L. aut Leith, S. aut Proslier, T. aut Gorgi Zadeh, S. aut Timmins, M. aut Therasse, M. aut Koettig, T. aut Atieh, S. aut Brunner, O. aut Gerigk, F. aut Enthalten in EPJ Techniques and Instrumentation Berlin : SpringerOpen, 2014 10(2023), 1 vom: 16. März (DE-627)785702423 (DE-600)2769516-5 2195-7045 nnns volume:10 year:2023 number:1 day:16 month:03 https://dx.doi.org/10.1140/epjti/s40485-023-00094-5 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 10 2023 1 16 03
spelling	10.1140/epjti/s40485-023-00094-5 doi (DE-627)SPR04971645X (SPR)s40485-023-00094-5-e DE-627 ger DE-627 rakwb eng Venturini Delsolaro, W. verfasserin aut Progress and R/D challenges for FCC-ee SRF 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2023 Abstract 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. A global solution was elaborated for the FCC Conceptual Design Report (Abada in Eur Phys J Spec Top 228):261–623, 2019), and is referred here as the baseline. Recently, further studies have led to a new optimized baseline, still based on traditional elliptical cavities. In parallel, a novel concept, named the Slotted Waveguide ELLiptical (SWELL), was proposed with the potential of greatly simplified logistics and reduced costs. Under several aspects, all these changes call for enhanced performance of the RF systems. A vigorous R&D program has therefore continued since the publication of the CDR, with the aim of pushing the performance and demonstrating the feasibility of a more advanced baseline and, more recently, of the SWELL option. The progress and challenges of this ambitious program were presented in the dedicated SRF sessions at FCC week 2022 (FCC week 2022 website, 2022, https://indico.cern.ch/event/1064327/timetable/) and are summarized in this paper. Future Circular Collider (dpeaa)DE-He213 RF superconductivity (dpeaa)DE-He213 Accelerating cavity (dpeaa)DE-He213 Garlasche, M. aut Peauger, F. aut Rosaz, G. aut Karpov, I. aut Zhang, L. aut Valente Feliciano, A. M. aut Udongwo, S. A. aut Bianchi, A. aut Bellini, G. aut Ferrera, L. M. A. aut Pereira Carlos, C. aut Vega Cid, L. aut Leith, S. aut Proslier, T. aut Gorgi Zadeh, S. aut Timmins, M. aut Therasse, M. aut Koettig, T. aut Atieh, S. aut Brunner, O. aut Gerigk, F. aut Enthalten in EPJ Techniques and Instrumentation Berlin : SpringerOpen, 2014 10(2023), 1 vom: 16. März (DE-627)785702423 (DE-600)2769516-5 2195-7045 nnns volume:10 year:2023 number:1 day:16 month:03 https://dx.doi.org/10.1140/epjti/s40485-023-00094-5 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 10 2023 1 16 03
allfields_unstemmed	10.1140/epjti/s40485-023-00094-5 doi (DE-627)SPR04971645X (SPR)s40485-023-00094-5-e DE-627 ger DE-627 rakwb eng Venturini Delsolaro, W. verfasserin aut Progress and R/D challenges for FCC-ee SRF 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2023 Abstract 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. A global solution was elaborated for the FCC Conceptual Design Report (Abada in Eur Phys J Spec Top 228):261–623, 2019), and is referred here as the baseline. Recently, further studies have led to a new optimized baseline, still based on traditional elliptical cavities. In parallel, a novel concept, named the Slotted Waveguide ELLiptical (SWELL), was proposed with the potential of greatly simplified logistics and reduced costs. Under several aspects, all these changes call for enhanced performance of the RF systems. A vigorous R&D program has therefore continued since the publication of the CDR, with the aim of pushing the performance and demonstrating the feasibility of a more advanced baseline and, more recently, of the SWELL option. The progress and challenges of this ambitious program were presented in the dedicated SRF sessions at FCC week 2022 (FCC week 2022 website, 2022, https://indico.cern.ch/event/1064327/timetable/) and are summarized in this paper. Future Circular Collider (dpeaa)DE-He213 RF superconductivity (dpeaa)DE-He213 Accelerating cavity (dpeaa)DE-He213 Garlasche, M. aut Peauger, F. aut Rosaz, G. aut Karpov, I. aut Zhang, L. aut Valente Feliciano, A. M. aut Udongwo, S. A. aut Bianchi, A. aut Bellini, G. aut Ferrera, L. M. A. aut Pereira Carlos, C. aut Vega Cid, L. aut Leith, S. aut Proslier, T. aut Gorgi Zadeh, S. aut Timmins, M. aut Therasse, M. aut Koettig, T. aut Atieh, S. aut Brunner, O. aut Gerigk, F. aut Enthalten in EPJ Techniques and Instrumentation Berlin : SpringerOpen, 2014 10(2023), 1 vom: 16. März (DE-627)785702423 (DE-600)2769516-5 2195-7045 nnns volume:10 year:2023 number:1 day:16 month:03 https://dx.doi.org/10.1140/epjti/s40485-023-00094-5 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 10 2023 1 16 03
allfieldsGer	10.1140/epjti/s40485-023-00094-5 doi (DE-627)SPR04971645X (SPR)s40485-023-00094-5-e DE-627 ger DE-627 rakwb eng Venturini Delsolaro, W. verfasserin aut Progress and R/D challenges for FCC-ee SRF 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2023 Abstract 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. A global solution was elaborated for the FCC Conceptual Design Report (Abada in Eur Phys J Spec Top 228):261–623, 2019), and is referred here as the baseline. Recently, further studies have led to a new optimized baseline, still based on traditional elliptical cavities. In parallel, a novel concept, named the Slotted Waveguide ELLiptical (SWELL), was proposed with the potential of greatly simplified logistics and reduced costs. Under several aspects, all these changes call for enhanced performance of the RF systems. A vigorous R&D program has therefore continued since the publication of the CDR, with the aim of pushing the performance and demonstrating the feasibility of a more advanced baseline and, more recently, of the SWELL option. The progress and challenges of this ambitious program were presented in the dedicated SRF sessions at FCC week 2022 (FCC week 2022 website, 2022, https://indico.cern.ch/event/1064327/timetable/) and are summarized in this paper. Future Circular Collider (dpeaa)DE-He213 RF superconductivity (dpeaa)DE-He213 Accelerating cavity (dpeaa)DE-He213 Garlasche, M. aut Peauger, F. aut Rosaz, G. aut Karpov, I. aut Zhang, L. aut Valente Feliciano, A. M. aut Udongwo, S. A. aut Bianchi, A. aut Bellini, G. aut Ferrera, L. M. A. aut Pereira Carlos, C. aut Vega Cid, L. aut Leith, S. aut Proslier, T. aut Gorgi Zadeh, S. aut Timmins, M. aut Therasse, M. aut Koettig, T. aut Atieh, S. aut Brunner, O. aut Gerigk, F. aut Enthalten in EPJ Techniques and Instrumentation Berlin : SpringerOpen, 2014 10(2023), 1 vom: 16. März (DE-627)785702423 (DE-600)2769516-5 2195-7045 nnns volume:10 year:2023 number:1 day:16 month:03 https://dx.doi.org/10.1140/epjti/s40485-023-00094-5 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 10 2023 1 16 03
allfieldsSound	10.1140/epjti/s40485-023-00094-5 doi (DE-627)SPR04971645X (SPR)s40485-023-00094-5-e DE-627 ger DE-627 rakwb eng Venturini Delsolaro, W. verfasserin aut Progress and R/D challenges for FCC-ee SRF 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s) 2023 Abstract 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. A global solution was elaborated for the FCC Conceptual Design Report (Abada in Eur Phys J Spec Top 228):261–623, 2019), and is referred here as the baseline. Recently, further studies have led to a new optimized baseline, still based on traditional elliptical cavities. In parallel, a novel concept, named the Slotted Waveguide ELLiptical (SWELL), was proposed with the potential of greatly simplified logistics and reduced costs. Under several aspects, all these changes call for enhanced performance of the RF systems. A vigorous R&D program has therefore continued since the publication of the CDR, with the aim of pushing the performance and demonstrating the feasibility of a more advanced baseline and, more recently, of the SWELL option. The progress and challenges of this ambitious program were presented in the dedicated SRF sessions at FCC week 2022 (FCC week 2022 website, 2022, https://indico.cern.ch/event/1064327/timetable/) and are summarized in this paper. Future Circular Collider (dpeaa)DE-He213 RF superconductivity (dpeaa)DE-He213 Accelerating cavity (dpeaa)DE-He213 Garlasche, M. aut Peauger, F. aut Rosaz, G. aut Karpov, I. aut Zhang, L. aut Valente Feliciano, A. M. aut Udongwo, S. A. aut Bianchi, A. aut Bellini, G. aut Ferrera, L. M. A. aut Pereira Carlos, C. aut Vega Cid, L. aut Leith, S. aut Proslier, T. aut Gorgi Zadeh, S. aut Timmins, M. aut Therasse, M. aut Koettig, T. aut Atieh, S. aut Brunner, O. aut Gerigk, F. aut Enthalten in EPJ Techniques and Instrumentation Berlin : SpringerOpen, 2014 10(2023), 1 vom: 16. März (DE-627)785702423 (DE-600)2769516-5 2195-7045 nnns volume:10 year:2023 number:1 day:16 month:03 https://dx.doi.org/10.1140/epjti/s40485-023-00094-5 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 10 2023 1 16 03
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spellingShingle	Venturini Delsolaro, W. misc Future Circular Collider misc RF superconductivity misc Accelerating cavity Progress and R/D challenges for FCC-ee SRF
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topic_title	Progress and R/D challenges for FCC-ee SRF Future Circular Collider (dpeaa)DE-He213 RF superconductivity (dpeaa)DE-He213 Accelerating cavity (dpeaa)DE-He213
topic	misc Future Circular Collider misc RF superconductivity misc Accelerating cavity
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title_sort	progress and r/d challenges for fcc-ee srf
title_auth	Progress and R/D challenges for FCC-ee SRF
abstract	Abstract 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. A global solution was elaborated for the FCC Conceptual Design Report (Abada in Eur Phys J Spec Top 228):261–623, 2019), and is referred here as the baseline. Recently, further studies have led to a new optimized baseline, still based on traditional elliptical cavities. In parallel, a novel concept, named the Slotted Waveguide ELLiptical (SWELL), was proposed with the potential of greatly simplified logistics and reduced costs. Under several aspects, all these changes call for enhanced performance of the RF systems. A vigorous R&D program has therefore continued since the publication of the CDR, with the aim of pushing the performance and demonstrating the feasibility of a more advanced baseline and, more recently, of the SWELL option. The progress and challenges of this ambitious program were presented in the dedicated SRF sessions at FCC week 2022 (FCC week 2022 website, 2022, https://indico.cern.ch/event/1064327/timetable/) and are summarized in this paper. © The Author(s) 2023
abstractGer	Abstract 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. A global solution was elaborated for the FCC Conceptual Design Report (Abada in Eur Phys J Spec Top 228):261–623, 2019), and is referred here as the baseline. Recently, further studies have led to a new optimized baseline, still based on traditional elliptical cavities. In parallel, a novel concept, named the Slotted Waveguide ELLiptical (SWELL), was proposed with the potential of greatly simplified logistics and reduced costs. Under several aspects, all these changes call for enhanced performance of the RF systems. A vigorous R&D program has therefore continued since the publication of the CDR, with the aim of pushing the performance and demonstrating the feasibility of a more advanced baseline and, more recently, of the SWELL option. The progress and challenges of this ambitious program were presented in the dedicated SRF sessions at FCC week 2022 (FCC week 2022 website, 2022, https://indico.cern.ch/event/1064327/timetable/) and are summarized in this paper. © The Author(s) 2023
abstract_unstemmed	Abstract 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. A global solution was elaborated for the FCC Conceptual Design Report (Abada in Eur Phys J Spec Top 228):261–623, 2019), and is referred here as the baseline. Recently, further studies have led to a new optimized baseline, still based on traditional elliptical cavities. In parallel, a novel concept, named the Slotted Waveguide ELLiptical (SWELL), was proposed with the potential of greatly simplified logistics and reduced costs. Under several aspects, all these changes call for enhanced performance of the RF systems. A vigorous R&D program has therefore continued since the publication of the CDR, with the aim of pushing the performance and demonstrating the feasibility of a more advanced baseline and, more recently, of the SWELL option. The progress and challenges of this ambitious program were presented in the dedicated SRF sessions at FCC week 2022 (FCC week 2022 website, 2022, https://indico.cern.ch/event/1064327/timetable/) and are summarized in this paper. © The Author(s) 2023
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This inverse scaling results naturally from a fixed budget for the synchrotron radiation, which the SRF cavities need to compensate. A global solution was elaborated for the FCC Conceptual Design Report (Abada in Eur Phys J Spec Top 228):261–623, 2019), and is referred here as the baseline. Recently, further studies have led to a new optimized baseline, still based on traditional elliptical cavities. In parallel, a novel concept, named the Slotted Waveguide ELLiptical (SWELL), was proposed with the potential of greatly simplified logistics and reduced costs. Under several aspects, all these changes call for enhanced performance of the RF systems. A vigorous R&D program has therefore continued since the publication of the CDR, with the aim of pushing the performance and demonstrating the feasibility of a more advanced baseline and, more recently, of the SWELL option. The progress and challenges of this ambitious program were presented in the dedicated SRF sessions at FCC week 2022 (FCC week 2022 website, 2022, https://indico.cern.ch/event/1064327/timetable/) and are summarized in this paper.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Future Circular Collider</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">RF superconductivity</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Accelerating cavity</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Garlasche, M.</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Peauger, F.</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Rosaz, G.</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Karpov, I.</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Zhang, L.</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Valente Feliciano, A. 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