TTC 2026 Meeting, CEA-CNRS-Université Paris Saclay, 9-12 June 2026, Gif sur Yvette, France

9 juin 2026, 08:00 → 12 juin 2026, 18:00 Europe/Paris

Ecole Centrale Supelec

Catherine MADEC (CEA), David Longuevergne (IJCLab)

In line with TTC spirit, the registration at this event is free of charge. However, the social dinner will be at your expense. 

TTC_2026.pdf

mar. 9 juin

08:30 → 09:00 Registrations

09:00 → 09:30 Opening & Welcome

Présidents de session: Catherine MADEC (CEA), David Longuevergne (IJCLab)

09:30 → 10:30 Plenary session: Plenary 1

Président de session: Robert Laxdal (Triumf)

09:30 SRF activities at CEA and IJCLAB (TBD)

Orateur: TBD

10:00 European Strategy for SRF development

Orateur: Dr Peter McIntosh (UKRI-STFC)

10:30 → 11:00 Coffee break

11:00 → 12:35 WG-1: Latest Activities on High-G and High-Q Performances: session 1 - Surface Processing Toward Project Realization

Présidents de session: Daniel Bafia (FNAL), Jinfang Chen (SARI), Lea Steder (DESY)

11:00 Summary of Remote High Q/High Gradient Working Group

Orateur: Dr Akira Miyazaki (CNRS/IN2P3/IJCLab)

11:05 Recent result of 2-step baking at KEK

Orateur: Eric Viklund (KEK)

11:23 Recent progress of SHINE high-Q cavities

Orateur: Yue Zong (SARI)

11:41 Status and Results of Mid-Temperature Baking for PIP-II LB 650 MHz Cavities

Orateur: Jacopo Bernardini (Fermilab)

11:59 Results from mid-T bake applied to 1.5 GHz C75 5-cell cavities for CEBAF

Orateur: Pashupati Dhakal (Jlab)

12:17 Surface treatment platform construction and preliminary experiment for S3FEL

Orateur: Shaohua Peng (IASF)

11:00 → 12:35 WG-3: R&D for Mass production and Quality assurance for accelerator modules: Session 1 - Experience of current projects : EU-XFEL, LCLS-II-HE, FRIB, RAON, ESS, SHINE, CiADS, S3FEL, PIP-II, Hi-Lumi

Présidents de session: Laura Monaco (INFN), Mattia Parise (Fermilab), Takeshi Dohmae (KEK)

11:00 Experience of current projects : EU-XFEL, LCLS-II-HE, FRIB, RAON, ESS, SHINE, CiADS, S3FEL, PIP-II, Hi-Lumi

1.Achieved Yield vs. Design Specs: What were the final yield rates for your project’s cavities, high-power couplers, and cryomodule components, and how did the achieved performance compare to the original design specifications?
2.Performance Transfer & Margins: What was the observed performance degradation from the Vertical Test (VT) to the final cryomodule (CM) operation, and what rationale was used to define the design margins necessary to account for this "VT-to-CM" transfer?
3.Industrialization & Repeatability:Which specific cryomodule assembly tools, cleanroom assembly tools, or standardized procedures were most critical for ensuring repeatability and maintaining high throughput during the production phase?
4.Supply Chain & Material Quality: How did material selection and vendor-specific quality assurance impact your production timeline, and did you encounter significant performance variations tied to different niobium batches or suppliers?
5.Logistics & Transportation: What were the primary technical difficulties encountered during the transportation of finished cryomodule components, and what specific monitoring criteria (e.g., vacuum, shocks, alignment) were used to validate the hardware's integrity upon arrival?
6.Spare Parts Strategy: What was the ratio of spare parts (cavities, couplers, etc,) required versus the total installed count, and was this "buffer" sufficient to cover the actual non-conforming parts during production?

Orateurs: Detlef Reschke (DESY), James Maniscalco (SLAC), Laura Popielarski (MSU), Youngkwon Kim (IBS), Paolo Pierini (ESS), Jinfang Chen (SARI), Jiang Tiancai (IMP), Han Li (IASF), Mattia Parise (Fermilab), Leonardo Ristori (CERN), Jacopo Bernardini (Fermilab)

11:50 Open Discussion

12:35 → 14:00 Lunch break

14:00 → 15:30 WG-1: Latest Activities on High-G and High-Q Performances: session 2 - Surface Processing R&D

Présidents de session: Daniel Bafia (FNAL), Jinfang Chen (SARI), Lea Steder (DESY)

14:00 Recent progress in high-frequency pulse electropolishing of niobium and SRF cavity in ionic liquid

Orateur: Qingwei Chu (IMP)

14:18 Enhancement of medium-temperature treated cavities for high-Q and high gradient

Orateur: Julia Goedecke (DESY)

14:36 Frequency shift measurements as indicator for SRF performance

Orateur: Marc Wenskat (DESY)

14:54 Crystalline ZrO2 Capping Layer with Atomically-Sharp Oxide-Superconductor Interface

Orateur: Nathan Sitarman (Cornell)

15:12 Progress in understanding magnetic-flux-entry in coated Nb using β-detected NMR

Orateur: Ryan McFadden (Triumf)

14:00 → 14:45 WG-3: R&D for Mass production and Quality assurance for accelerator modules: Session 2a - Pressure Vessel Code in Accelerator Projects

Présidents de session: Laura Monaco (INFN), Mattia Parise (Fermilab), Takeshi Dohmae (KEK)

14:00 Experience in EU projects (Eu-FEL 3.9GHz, ESS, PIP-II)

Orateur: Daniele Sertore (INFN)

14:10 How to build proper cryogenic lines to fulfil PED requirements

Orateur: Henry Przybilski (ESS)

14:15 Experience China (SHINE)

Orateur: Yawei Huang (ShanghaiTech University)

14:25 Experience Japan (KEK)

Orateur: Takeshi Dohmae (KEK)

14:35 Open Discussion

"QUESTIONS FOR LABS
1) What is the request for material? How to use new material under high pressure condition (and cryogenic temperature)?
2) What kind of pressure test required? And how much is the pressure?
3) How to harmonize each regions (how industries comply to foreign pressure vessel codes)?
4) Which kind welding test requested?
5) Which kind of mechanical test required?
6) How to built proper cryogenic lines to fulfil PED requirements?"

14:45 → 15:30 WG-3: R&D for Mass production and Quality assurance for accelerator modules: Session 2b - Mass Production and QA/QC: HOM & bellows

Présidents de session: Laura Monaco (INFN), Mattia Parise (Fermilab), Takeshi Dohmae (KEK)

14:45 Production of material for HOM housing for TESLA cavity and Ti bellows for cavity jacket

Orateur: Takeshi Dohmae (KEK)

14:57 Fabrication Challenges and Process Optimization of HOM Absorber for the S3FEL

Orateur: Huizhong Pang (IASF)

15:09 Challenges with production of HOM Couplers for Hi-Lumi

Orateur: Naeem Huque (JLab)

15:21 Open Discussion

15:30 → 16:00 Coffee break

16:00 → 17:30 WG-1: Latest Activities on High-G and High-Q Performances: session 3 - Theory + Sample studies

Présidents de session: Daniel Bafia (FNAL), Jinfang Chen (SARI), Lea Steder (DESY)

16:00 New insights in the multilayer theory of superconducting RF cavities OR Progress on the Microscopic Theory of Inhomogeneous Disordered Superconductors

Orateur: Carlos Redondo-Herrero (IJCLab)

16:18 Microwave Response of Superconductors with Paramagnetic Impurities

Orateur: Mehdi Zrea (LSU)

16:36 Correlating Nb-SRF Surface Processing with Evolution of Surface Electronic States

Orateur: Malvika Tripathi (Fermilab)

16:54 Investigating Impurity-Based Treatments in SRF Cavities through Coupled RF and Materials Characterization

Orateur: Hannah Hu (Fermilab)

17:12 Electropolishing-induced topographic defects in niobium: insights and implications for superconducting radio frequency applications

Orateur: Eric Lechner (Jlab)

16:00 → 17:30 WG-3: R&D for Mass production and Quality assurance for accelerator modules: Session 3 - Mass Production and QA/QC: FPC & CM

Présidents de session: Laura Monaco (INFN), Mattia Parise (Fermilab), Takeshi Dohmae (KEK)

16:00 Development of SHINE 3.9 GHz fundamental power couplers

Orateur: Zhenyu Ma (SARI)

16:12 Issues and mitigation methods with FPC during 1.3GHz Cryomodule assembly

Orateur: Han Li (IASF)

16:24 Fundamental Power coupler for ESS, experience from series production and conditioning

Orateur: Thibault Hamelin (CEA)

16:36 Fabrication Status and Addressing Ceramic Yield Challenges

Orateur: Tommaso Aiazzi (Fermilab)

16:48 Standardization of the PIP-II cavity string assembly procedure and quality assurancey

Orateur: Mattia Parise (Fermilab)

17:00 Initial CM operation performances on test and commissioning

Orateur: Cecilia Maiano (ESS)

17:12 2K static heat load performance for SHINE cryomodules

Orateur: Yawei Huang (ShanghaiTech University)

17:24 Open Discussion

17:30 → 18:00 Break

18:00 → 19:00 Satellites: CB meeting

mer. 10 juin

09:00 → 10:30 Plenary session: Plenary 2

Président de session: Jie Gao (IHEP)

09:00 SRF Systems for the EIC Project

Orateur: Joseph Matalevich (JLab)

09:30 Development, commissioning and high-current CW operation of 166.6 MHz HOM-damped SRF modules at HEPS

Orateur: Dr Zhang Pei (IHEP)

10:00 Commissioning and current Status of HELIAC Project at GSI

Orateur: Dr Maksym Miski-Oglu (GSI)

10:30 → 11:00 Coffee break

11:00 → 12:30 WG-1: Latest Activities on High-G and High-Q Performances: session 4 - Sample studies

Présidents de session: Daniel Bafia (FNAL), Jinfang Chen (SARI), Lea Steder (DESY)

11:00 Enhanced RF Performances in 1.3 GHz Nb Cavities via Mid-T Baking: Insights from Correlative Sample Studies

Orateur: Zhaoxi Chen (ShanghaiTech University)

11:18 The Origin of Medium-Temperature Baking Efficacy: Formation and Role of an Ordered Oxide Template

Orateur: Didi Luo (IMP)

11:36 Manipulation of Nb carbide during Mid-T bake : Impact of baking configuration and plasma treatment

Orateur: Chahinez Boutelaa

11:54 Field of first vortex penetration of inhomogeneous materials: Predictions via Ginzburg-Landau theory and comparison to magnetometry measurements

Orateur: Lucas Wallace (University of Victoria)

12:12 Studying the effect of metallographic polishing on trapped magnetic flux with CRAFT

Orateur: Alex Cierpka (HZB)

11:00 → 12:30 WG-3: R&D for Mass production and Quality assurance for accelerator modules: Session 4 - Mass Production and QA/QC: CM & CAV

Présidents de session: Laura Monaco (INFN), Mattia Parise (Fermilab), Takeshi Dohmae (KEK)

11:00 Production and Quality Lessons from Large Cryomodule Projects at Jefferson Lab

Orateur: Naeem Huque (JLab)

11:12 QC experience of CM component fabrication, vendor challenges

Orateur: Jacopo Bernardini (Fermilab)

11:24 RF Testing and Performance Analysis of Low Beta Superconducting Cavities for HIAF Facility

Orateur: Wei Shihui (IMP)

11:36 Development of SRF Cavities for S3FEL

Orateur: Yuchao Fang (IASF)

11:48 PIP-II cavity qualification challenges (both SSR and elliptical)

Orateurs: Jacopo Bernardini (Fermilab), Mattia Parise (Fermilab)

12:00 Production of RFD crab cavities for LHC Luminosity upgrade

Orateur: Leonardo Ristori (CERN)

12:12 Progress about CSNS-II superconducting cavities

Orateur: Wenzhong Zhou (IHEP)

12:24 Open Discussion

12:30 → 14:00 Lunch break

14:00 → 15:30 WG-2: Effective operation of aging machines for performance and reliability: Session 1 - Performance degradation and component failures in operation

Présidents de session: Enrico Cenni (CEA IRFU), Tiancai Jiang (IMP), Zhongyuan Yao (Triumf)

14:00 LHC SRF cavities: operational experience

Orateur: Katarzyna Turaj (CERN)

14:15 What we learned from the six-year operation of SRILAC

Orateur: Naruhiko Sakamoto (Riken)

14:30 Operational Status of the RAON Low Energy Linac

Orateur: Youngkwon Kim (IBS)

14:45 Typical operation issue and relevant experience of CAFE/CAFE2 SRF linac

Orateur: Andong Wu (IMP)

15:00 Performance degradation and component failures of SC cavity system in SuperKEKB operation

Orateur: Takafumi Okada

14:00 → 15:30 WG-4: R&D challenges for future advanced projects: Session 1- Field emission prevention and additive manufacturing

Présidents de session: Cristian Pira (INFN LNL), Laura Popielarski (MSU), Teng Tan (IMP)

14:00 Now and future automatic clean assembly of SRF cavity

Orateur: Hao GUO (IMP)

14:12 SRF Robotic Assembly Development at Fermilab

Orateur: Colin Narug (Fermilab)

14:24 Development of a cobot-assisted HPR system for complex geometries

Orateur: Nicolas Gandolfo (IJCLab)

14:36 COBOT operations and development at CEA

Orateur: Julien Drant (CEA IRFU)

14:48 Robotic assembly for field emission free systems

Orateur: Roger Ruber (JLab)

15:00 Cu substrate by Additive Manufacturing

Orateur: Fabien Eozenou (CEA Saclay, IRFU/DACM)

15:12 1.3 GHz cavities substrate production by Wire Additive Manufacturing

Orateur: Oscar Azzolini (INFN LNL)

15:24 Discussion

15:30 → 16:00 Coffee break

15:55 → 17:30 WG-2: Effective operation of aging machines for performance and reliability: Session 2 - Performance degradation and component failures in operation

Présidents de session: Enrico Cenni (CEA IRFU), Tiancai Jiang (IMP), Zhongyuan Yao (Triumf)

16:00 Cavity performance over the operational lifetime of the LCLS superconducting linac

Orateur: Sebastian Aderhold

16:15 Particulate lofting and migration under exposure of low energy electron beam

Orateur: Aveen Mahon (Triumf)

16:30 Particles measurement of beam line gate valves

Orateur: Stéphane Berry (CEA)

16:45 Field emission experience: from module tests in test stand to first and second commissioning in ESS linac

Orateur: Cecilia Maiano (ESS)

17:00 Gas induced Q degradation in ISAC-II operation

Orateur: Zhongyuan Yao (Triumf)

17:15 Cavity performance evolution from vertical test to on-line commissioning at SHINE

Orateur: Jinfang Chen (SARI)

16:00 → 17:30 WG-4: R&D challenges for future advanced projects: Session 2 - Couplers and Tuners

Présidents de session: Cristian Pira (INFN LNL), Laura Popielarski (MSU), Teng Tan (IMP)

16:00 Development and high-power operation of the FPC for HEPS 166.6 MHz srf cavities

Orateur: Tongming Huang (IHEP)

16:12 Achievement of CW 100 kW Class Power Transmission by an L-band High-Power Input Coupler for SRF Accelerators.

Orateur: Pragya Nama (KEK)

16:24 Compact on-axis coaxial HOM damper for SRF cavities

Orateur: Andrei Lunin (Fermilab)

16:36 Characterization of Cryogenic Beamline Absorber Materials for High-Current SRF Accelerators

Orateur: Axel Perez Ruiz (IJCLab)

16:48 ALD Coating for Multipacting Mitigation in ICONE Couplers

Orateur: Yasmine Kalboussi (CEA)

17:00 Improvement of CW ERL Performance of TESLA-type Cavities by Fast Reactive Tuner and Coated HOM-Antennas

Orateur: Timo Stengler (University of Mainz)

17:12 latest findings on the development of the Ferroelectric Fast Reactive Tuner within the ISAS collaboration

Orateur: Nicholas Shipman (HZB)

17:24 Discussion

17:30 → 18:00 Break

18:00 → 19:00 Satellites: TB meeting

jeu. 11 juin

09:00 → 10:30 Plenary session: Plenary 3

Président de session: Sebastian Aderhold

09:00 LCLS-II-HE upgrade status/Recent Status of LCLS-II operation experience

Orateur: Dr James Maniscalco (SLAC)

09:30 RF commissioning of HIAF's iLINAC

Orateur: Dr Feng Qiu (IMP)

10:00 Experience with recommissioning of the European XFEL after Long Installation and Maintenance Period

Orateur: Dr Mateusz Wiencek (DESY)

10:30 → 11:00 Coffee break

11:00 → 12:30 WG-2: Effective operation of aging machines for performance and reliability: Session 3 - FE mitigation and plasma processing

Présidents de session: Enrico Cenni (CEA IRFU), Tiancai Jiang (IMP), Zhongyuan Yao (Triumf)

11:00 Plasma processing of elliptical cavities at INFN - LASA

Orateur: Elisa DelCore (INFN)

11:15 Towards Plasma Processing in SPIRAL2 SRF Cavities

Orateur: Martin Devaux (Ganil)

11:30 Plasma processing development at CSNS-II

Orateur: Cong Zhang (IHEP)

11:45 Plasma process for several types of cavities in CiADS

Orateur: Andong Wu (IMP)

12:00 In-situ plasma processing, pulse conditioning, helium pulse processing, and thermocycling on low-beta cavities at the ATLAS

Orateur: Megan McIntyre (ANL)

12:15 Development of in-situ plasma processing procedures with the fundamental passband on 1.3GHz multi-cell SRF cavities at TRIUMF

Orateur: Will Stokes (Triumf)

11:00 → 12:30 WG-4: R&D challenges for future advanced projects: MATERIALS 1, Surface Engineering, Nb/Cu

Présidents de session: Cristian Pira (INFN LNL), Laura Popielarski (MSU), Teng Tan (IMP)

11:00 Reduced BCS Resistance and Stable Medium-Field Operation from Nb3Al-Nb S'S Multilayer

Orateur: Nathan Sitaraman (Cornell)

11:12 ALD interlayer to suppress thermoelectric currents

Orateur: Ivana Curci (CEA)

11:24 ALD R&D at University Hamburg

Orateur: Marc Wenskat (DESY)

11:36 High-energy pulsed magnetron re-sputtering/sputtering apparatus for Nb-Cu 1.3 GHz RF cavities

Orateur: Peng Dong (ShanghaiTech University)

11:48 From 1.3 GHz to 400 MHz Nb/Cu Cavities: Challenges and Optimisation Strategies

Orateur: Caroline Hain (CERN)

12:00 Recent results of Nb/Cu coating cavity under KEK/CERN collaboration

Orateur: Walter Venturini (CERN)

12:12 Recent Progress in Nb and Nb3Sn on Cu coatings for SRF applications at JLab

Orateur: Anne-Marie Valente-Feliciano (Jefferson Lab)

12:24 Discussion

12:30 → 14:00 Lunch break

14:00 → 15:30 WG-2: Effective operation of aging machines for performance and reliability: Session 4 - FE mitigation, FE diagnose, activation and root causes

Présidents de session: Enrico Cenni (CEA IRFU), Tiancai Jiang (IMP), Zhongyuan Yao (Triumf)

14:00 Advancing In-Situ Plasma Processing for SRF Cavities at Fermilab

Orateur: Bianca Giaccone (Fermilab)

14:15 Ozone processing and comparison with plasma processing

Orateur: Roger Ruber (JLab)

14:30 Field Emission Diagnostics and Magnetic Heating Effects in Superconducting Cavities

Orateur: Heetae Kim (IBS)

14:45 Analysis of Parasatic emissions phenoma during cryomodule operation

Orateur: Guillaume Devanz (CEA)

15:00 Field emission analysis in SRF cavities for PIP-II using GEANT4

Orateur: Sajini Wijethunga (Fermilab)

15:15 Surface-Driven Field Emission Mechanisms and Mitigation in SRF Cavities

Orateur: TongTong Zhu (IMP)

14:00 → 15:30 WG-4: R&D challenges for future advanced projects: MATERIALS 2, Nb3Sn

Présidents de session: Cristian Pira (INFN LNL), Laura Popielarski (MSU), Teng Tan (IMP)

14:00 Recent Progress in Nb3Sn on Cu coatings for SRF cavities at LNL

Orateur: Matteo Lazzari (INFN LNL)

14:12 Recent Progress in Nb3Sn on Cu coatings for SRF cavities at UKRI

Orateur: Reza Valizadeh (STFC/UKRI)

14:24 Towards Nb3Sn coated copper cavities for energy efficient SRF application

Orateur: Marton Major (Darmstadt Technical University)

14:36 Optimization of Bronze-Route Nb3Sn Films on Copper Substrates for Quadrupole Resonator Testing

Orateur: Ming Lu (HZB)

14:48 An Integrated Approach to Nb₃Sn Cavities: Bronze-Route Fabrication and Laser Post-Treatment

Orateur: Teng Tan (IMP)

15:00 Challenges to the vapor diffusion Nb3Sn coatings: A Material Science Analysis

Orateur: Nikki Tagdulang (Fermilab)

15:12 Discussion

15:30 → 16:00 Coffee break

16:00 → 17:30 Hot topics: Developing SRF towards Turn-Key Industrial Systems

Président de session: Anne-Marie Valente-Feliciano (Jefferson Lab)

16:00 Technical Frontier

16:25 Engineering path for reliability

16:50 Strategic democratization

17:30 → 19:30 Break

19:30 → 21:30 Social dinner

ven. 12 juin

09:00 → 10:30 Seminar

Président de session: Catherine MADEC (CEA)

09:00 Einstein Telescope, pushing the outer limits of gravitational waves detection

Orateur: Angélique Lartaux (IJCLab)

09:45 Superconductivity and Cryogenics in Space : An active magnetic shield to protect astronauts for interstellar travels

Orateur: Bertrand Baudouy (CEA)

10:30 → 11:00 Coffee break

11:00 → 13:00 Plenary session: Summary

Président de session: Sergey Belomestnykh (Fermilab)

11:00 Summary WG1

11:20 Summary WG2

11:40 Summary WG3

12:00 Summary WG4

12:20 TB/CB Report

12:40 Closing

Orateurs: Catherine MADEC (CEA), David Longuevergne (IJCLab)

13:00 → 14:30 Lunch break

14:30 → 16:30 Lab Tour