SRF2023 - Classification: SRF Applications / Other new applications

Paper	Title	Page
WEIXA06	Recent Advances in Metallographic Polishing for SRF Application	646
	O. Hryhorenko JLab, Newport News, Virginia, USA C.Z. Antoine, F. Éozénou, Th. Proslier Université Paris-Saclay, CEA, Gif-sur-Yvette, France T. Dohmae KEK, Ibaraki, Japan S. Keckert, J. Knobloch, O. Kugeler HZB, Berlin, Germany D. Longuevergne Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
	Funding: ENSAR-2 under grant agreement N° 654002. IFAST under Grant Agreement No 101004730. The U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177. This talk is an overview of the metallographic polishing R&D program covering Niobium and Copper substrates treatment for thin film coating as an alternative fabrication pathway for 1.3 GHz elliptical cavities. The presented research is the result of a collaborative effort between IJCLab, CEA/Irfu, HZB, and KEK in order to develop innovative surface processing and cavity fabrication protocols capable of meeting stringent requirements for SRF surfaces, including the reduction of safety risks and ecological footprint, enhancing reliability, improving the surface roughness, and potentially allowing cost reduction. The research findings will be disclosed.
	Slides WEIXA06 [7.469 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-SRF2023-WEIXA06
About •	Received ※ 16 June 2023 — Revised ※ 27 June 2023 — Accepted ※ 28 June 2023 — Issue date ※ 14 July 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THIXA03	Cryocooler Application for Accelerator and Development Status of Powerful Cryocooler at SHI Ltd.	968
	T. Ikeda, S. Sasazaki SHI, Tokyo, Japan
	Advances in recent Nb₃Sn cavity development makes possible to operate the cavities with Qo ~ 1xE10 at 4.3 K and to design SRF accelerator in which the cavities are cooled directly with small mechanical cryocoolers instead of using liquid helium. Conduction-cooling with cryocoolers greatly simplify the overall design and also contribute for cost saving of an SRF accelerator, making the SRF technology feasible for industrial accelerators. However, in the case of using current cryocooler systems (like Gifford-McMahon cryocooler, Pulse-Tube cryocooler, etc.) for the conduction-cooling, since the cooling capacity per unit is small, multiple units will be used in combination depending on the required cooling capacity, it will cause problems in terms of power consumption (efficiency), footprint, and maintenance costs. Therefore, SHI have been developing a large-capacity and high-efficiency 4KGM-JT (Gifford-McMahon-Joule-Thomson) cryocooler system in the 10 W class at 4.2 K. This contribution will report the overview of this cryocooler system and its status of development.
	Slides THIXA03 [1.638 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-SRF2023-THIXA03
About •	Received ※ 20 June 2023 — Revised ※ 25 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 04 July 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THIXA06	Dark Matter and Gravitational Waves Experiments with SRF Cavities
	B. Giaccone, A. Grassellino, S. Posen, A.S. Romanenko Fermilab, Batavia, Illinois, USA
	Funding: This material is based upon work supported by the U.S. DOE, SC, National QIS Research Centers, Superconducting Quantum Materials and Systems Center (SQMS) under contract n. DE-AC02-07CH11359 Recent efforts have shown that the SRF technology developed for accelerators can be successfully applied to new applications, including quantum computing, dark matter searches and beyond the standard model physics. The ultra-high quality factor of SRF cavities can allow to achieve unprecedented sensitivity in fields outside of the usual accelerator applications, for examples in dark photon and axion searches (both as dark matter candidates and lab-produced particles). Applications of SRF cavities for gravitational waves searches are also being investigated. The SQMS Physics and Sensing thrust is leveraging SRF cavities and QIS to search for new particles and BSM physics. This talk will highlight experiments where SRF cavities have already set experimental bounds on new physics.
	Slides THIXA06 [5.984 MB]
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THIXA07	Compact, High-Power Superconducting Electron Linear Accelerators for Environmental and Industrial Applications: Projects and Status
	J.C.T. Thangaraj, R. Dhuley, C.J. Edwards, I.V. Gonin, S. Kazakov, T.N. Khabiboulline, T.K. Kroc, T.H. Nicol, W. Pellico, A. Saini, V.P. Yakovlev Fermilab, Batavia, Illinois, USA
	We have developed and demonstrated a novel superconducting accelerator technology ¿ conduction cooling - that eliminates the need for liquid Helium, thus dramatically simplifying the infrastructure needed to access SRF technology for industrial applications. Our machine combines R&D breakthroughs in high-temperature SRF cavities (Nb₃Sn), cost-effective radio-frequency sources, modern technology cryo-coolers, and high-average current electron guns. We will describe currently active conduction-cooled accelerator projects at 650 MHz and 1.3 GHz. We will also present the experimental results on the conduction cooling of SRF cavities and briefly discuss results from other labs. Our compact linac is designed to generate electron beam energies up to 10 MeV in continuous-wave operation. Our detailed thermal, RF, and beam transport simulations show that a single accelerator module can deliver average beam power as high as 250 kW. We can reach up to 1 MW by combining several modules. Compact and light enough to mount on mobile platforms, our machine will enable applications such as treating contaminants in water, innovative pavement construction, and X-ray medical device sterilization.
	Slides THIXA07 [3.113 MB]
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FRIXA01	Achievement of the ILC Milestone by Beam Operation of STF-2 Accelerator at KEK
	Y. Yamamoto KEK, Ibaraki, Japan
	The STF-2 accelerator with fourteen 9-cell superconducting cavities at KEK has achieved many milestones for the International Linear Collider (ILC) project since 2019. The main achievements are the beam acceleration at 33 MV/m with nine cavities, the max. beam energy of 384 MeV, the beam power of 6 kW, the beam operation with 5.8 mA per bunch (21.5 ¿A as the beam intensity), the beam emittance of 5 mm mrad, the Low-Level RF control to compensate with heavy beam loading, etc. On the other hand, in these cool-down tests, the performance of cavities has changed including the radiation level. In this talk, these achievements and experiences in the STF-2 accelerator will be presented.
	Slides FRIXA01 [6.612 MB]
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Paper

Title

Page

Recent Advances in Metallographic Polishing for SRF Application

646

O. Hryhorenko
JLab, Newport News, Virginia, USA
C.Z. Antoine, F. Éozénou, Th. Proslier
Université Paris-Saclay, CEA, Gif-sur-Yvette, France
T. Dohmae
KEK, Ibaraki, Japan
S. Keckert, J. Knobloch, O. Kugeler
HZB, Berlin, Germany
D. Longuevergne
Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France

Funding: ENSAR-2 under grant agreement N° 654002. IFAST under Grant Agreement No 101004730. The U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177.
This talk is an overview of the metallographic polishing R&D program covering Niobium and Copper substrates treatment for thin film coating as an alternative fabrication pathway for 1.3 GHz elliptical cavities. The presented research is the result of a collaborative effort between IJCLab, CEA/Irfu, HZB, and KEK in order to develop innovative surface processing and cavity fabrication protocols capable of meeting stringent requirements for SRF surfaces, including the reduction of safety risks and ecological footprint, enhancing reliability, improving the surface roughness, and potentially allowing cost reduction. The research findings will be disclosed.

Slides WEIXA06 [7.469 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-SRF2023-WEIXA06

About •

Received ※ 16 June 2023 — Revised ※ 27 June 2023 — Accepted ※ 28 June 2023 — Issue date ※ 14 July 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THIXA03

Cryocooler Application for Accelerator and Development Status of Powerful Cryocooler at SHI Ltd.

968

T. Ikeda, S. Sasazaki
SHI, Tokyo, Japan

Advances in recent Nb₃Sn cavity development makes possible to operate the cavities with Qo ~ 1xE10 at 4.3 K and to design SRF accelerator in which the cavities are cooled directly with small mechanical cryocoolers instead of using liquid helium. Conduction-cooling with cryocoolers greatly simplify the overall design and also contribute for cost saving of an SRF accelerator, making the SRF technology feasible for industrial accelerators. However, in the case of using current cryocooler systems (like Gifford-McMahon cryocooler, Pulse-Tube cryocooler, etc.) for the conduction-cooling, since the cooling capacity per unit is small, multiple units will be used in combination depending on the required cooling capacity, it will cause problems in terms of power consumption (efficiency), footprint, and maintenance costs. Therefore, SHI have been developing a large-capacity and high-efficiency 4KGM-JT (Gifford-McMahon-Joule-Thomson) cryocooler system in the 10 W class at 4.2 K. This contribution will report the overview of this cryocooler system and its status of development.

Slides THIXA03 [1.638 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-SRF2023-THIXA03

About •

Received ※ 20 June 2023 — Revised ※ 25 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 04 July 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THIXA06

Dark Matter and Gravitational Waves Experiments with SRF Cavities

B. Giaccone, A. Grassellino, S. Posen, A.S. Romanenko
Fermilab, Batavia, Illinois, USA

Funding: This material is based upon work supported by the U.S. DOE, SC, National QIS Research Centers, Superconducting Quantum Materials and Systems Center (SQMS) under contract n. DE-AC02-07CH11359
Recent efforts have shown that the SRF technology developed for accelerators can be successfully applied to new applications, including quantum computing, dark matter searches and beyond the standard model physics. The ultra-high quality factor of SRF cavities can allow to achieve unprecedented sensitivity in fields outside of the usual accelerator applications, for examples in dark photon and axion searches (both as dark matter candidates and lab-produced particles). Applications of SRF cavities for gravitational waves searches are also being investigated. The SQMS Physics and Sensing thrust is leveraging SRF cavities and QIS to search for new particles and BSM physics. This talk will highlight experiments where SRF cavities have already set experimental bounds on new physics.

Slides THIXA06 [5.984 MB]

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THIXA07

Compact, High-Power Superconducting Electron Linear Accelerators for Environmental and Industrial Applications: Projects and Status

J.C.T. Thangaraj, R. Dhuley, C.J. Edwards, I.V. Gonin, S. Kazakov, T.N. Khabiboulline, T.K. Kroc, T.H. Nicol, W. Pellico, A. Saini, V.P. Yakovlev
Fermilab, Batavia, Illinois, USA

We have developed and demonstrated a novel superconducting accelerator technology ¿ conduction cooling - that eliminates the need for liquid Helium, thus dramatically simplifying the infrastructure needed to access SRF technology for industrial applications. Our machine combines R&D breakthroughs in high-temperature SRF cavities (Nb₃Sn), cost-effective radio-frequency sources, modern technology cryo-coolers, and high-average current electron guns. We will describe currently active conduction-cooled accelerator projects at 650 MHz and 1.3 GHz. We will also present the experimental results on the conduction cooling of SRF cavities and briefly discuss results from other labs. Our compact linac is designed to generate electron beam energies up to 10 MeV in continuous-wave operation. Our detailed thermal, RF, and beam transport simulations show that a single accelerator module can deliver average beam power as high as 250 kW. We can reach up to 1 MW by combining several modules. Compact and light enough to mount on mobile platforms, our machine will enable applications such as treating contaminants in water, innovative pavement construction, and X-ray medical device sterilization.

Slides THIXA07 [3.113 MB]

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRIXA01

Achievement of the ILC Milestone by Beam Operation of STF-2 Accelerator at KEK

Y. Yamamoto
KEK, Ibaraki, Japan

The STF-2 accelerator with fourteen 9-cell superconducting cavities at KEK has achieved many milestones for the International Linear Collider (ILC) project since 2019. The main achievements are the beam acceleration at 33 MV/m with nine cavities, the max. beam energy of 384 MeV, the beam power of 6 kW, the beam operation with 5.8 mA per bunch (21.5 ¿A as the beam intensity), the beam emittance of 5 mm mrad, the Low-Level RF control to compensate with heavy beam loading, etc. On the other hand, in these cool-down tests, the performance of cavities has changed including the radiation level. In this talk, these achievements and experiences in the STF-2 accelerator will be presented.

Slides FRIXA01 [6.612 MB]

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)