TTC2025 Meeting, IRIS/IBS, Daejeon, Korea

8 Apr 2025, 08:00 → 11 Apr 2025, 19:30 Asia/Seoul

Auditorium (Science Culture Center (2F))

Yeonsei Chung (IRIS/IBS)

The mission of the TESLA Technology Collaboration (TTC) is to advance superconducting RF (SRF) accelerator R & D and related accelerator studies across the broad diversity of scientific applications, and to keep open and provide a bridge for communication and sharing of ideas, developments, and testing across associated projects.

To this end the Collaboration supports and encourages free and open exchange of scientific and technical knowledge, expertise, engineering designs, and equipment.

We cordially welcome you to join the TTC meeting, hosted by the Institute for Rare Isotope Science (IRIS/IBS), and to be held at the Science Culture Center (map) in Daejeon, Korea on April 8-11, 2025.

Program at a glance

Day-Time Table.png

Incheon_to_Daejeon_Bus_Guide.pdf

RAON-SiteTour_Friday.pdf

TTC2025 Poster.pdf

TTC2025-Photogallery.zip

Venue(IBS)_maps.PNG

Venue_interior_map.pdf

Tuesday 8 April

08:00 → 09:00 Registration

Coffee and simple refreshments are available

09:00 → 09:30 Opening

Convener: Yeonsei Chung (IBS) (IRIS/IBS)

Opening-TTC2025-YeonseiChung.pptx

09:00 Opening Talk

Speaker: Yeonsei Chung (IBS) (IRIS/IBS)

Opening-TTC2025-YeonseiChung.pdf

Opening-TTC2025-YeonseiChung.pptx

09:10 Welcome by IRIS director

Speaker: Seung-woo Hong (IBS) (IRIS/IBS)

09:20 Introduction and update from the last TTC Meeting

Speaker: Eiji Kako (KEK) (KEK)

3 Kako Introduction Talk in TTC2025 at IBS 2025 April 08.pptx

09:30 → 10:30 Plenary Talk

Convener: Sergey Belomestnykh (FNAL) (Fermilab)

09:30 Status of RAON operational experience

Speaker: Yeonsei Chung (IBS) (IRIS/IBS)

TTC-IBS-Plenary-yschung.pdf

TTC-IBS-Plenary-yschung.pptx

10:00 First Operational Experience of PPU at SNS

Speaker: Sang-Ho Kim (ORNL) (ORNL)

5 First operation experience of PPU at SNS.pptx

10:30 → 11:00 Group Photo (#1) & Coffee Break

11:00 → 12:30 WG-1

Conveners: Peng Sha (IHEP), Marc Wenskat (DESY), Pashupati Dhakal (JLAB).

Convener: Peng Sha (IHEP), Marc Wenskat (DESY), Pashupati Dhakal (JLAB).

11:00 Mid-T baked and N-doped cavities performance for SHINE

Speaker: Yue Zong (SARI) (Shanghai Advanced Research Institute, Chinese Academy of Sciences)

WG1-Yue Zong-Mid-T baked and N-doped cavities performance for SHINE.pptx

11:30 Test results of N-doping cavities for DALS

Speaker: Weimin Yue (IASF) (IASF)

Test results of N-doping cavities for DALS-v2.pdf

Test results of N-doping cavities for DALS-v2.pptx

12:00 Recent progress on two-step baking activities at KEK

Speaker: Ryo Katayama (KEK) (KEK)

TTC_meeting_2025_Apr_8_ver7.pdf

11:00 → 12:30 WG-3

Conveners: Michiru Nishiwaki (KEK), Julien Branlard (DESY), Ryan Porter (SLAC)

Convener: Michiru Nishiwaki (KEK), Julien Branlard (DESY), Ryan Porter (SLAC)

11:00 Operational experience with high-Qext cavities at CEBAF

Speaker: Rama Bichmanchi (JLAB)

01- Operational Experience with high Qext Cavities at JLAB.pptx

11:30 R&D for high Q-ext operation for the EuXFEL upgrade

Speaker: Christian Schmidt (DESY)

02 - 2025-04 - TTC_WG3_CSchmidt.pptx

12:00 Experience with microphonics in the LCLS superconducting linac

Speaker: Sebastian Aderhold (SLAC)

03 - TTC25_WG3_Aderhold.pptx

12:30 → 14:00 Lunch

14:00 → 15:30 WG-1

Conveners: Peng Sha (IHEP), Marc Wenskat (DESY), Pashupati Dhakal (JLAB).

Convener: Peng Sha (IHEP), Marc Wenskat (DESY), Pashupati Dhakal (JLAB)

14:00 In-situ HRTEM Monitoring of Oxide Layer Decomposition on Niobium during Medium-Temperature Baking: Preliminary Results and Challenges

Speaker: Didi Luo (IMP)

Didi Luo_TTC_20250408_final.pptx

14:30 Sample study in the mid-T bake regime

Speaker: Philipp Kolb (TRIUMF)

SampleStudies at TRIUMF.pptx

15:00 Recent High-Q/High-G activities at IHEP

Speaker: Peng Sha (IHEP)

3 Recent High-QHigh-G activities at IHEP.pptx

14:00 → 15:30 WG-3

Conveners: Michiru Nishiwaki (KEK), Julien Branlard (DESY), Ryan Porter (SLAC)

Convener: Michiru Nishiwaki (KEK), Julien Branlard (DESY), Ryan Porter (SLAC)

14:00 RF commissioning of the ESS linac

Speaker: Paolo Pierini (ESS)

04 - ESS_RFCommissioning.pptx

14:30 Performance Achieved on PIP-II Pre-Series High-Beta Cavities at STFC

Speaker: Alan Wheelhouse (STFC)

TTC2025_PIP-II_Pre-Series_Cavities_Talk_(AWheelhouse).pptx

15:00 Open Discussion

Speaker: Julien Branlard (DESY)

06 - TTC2025-J.Branlard-Qextdiscussion.pptx

2024_01_29 - XM50.1-C2 quench with camera.mp4

15:30 → 16:00 Coffee Break

16:00 → 17:30 WG-1

Conveners: Peng Sha (IHEP), Marc Wenskat (DESY), Pashupati Dhakal (JLAB).

Convener: Peng Sha (IHEP), Marc Wenskat (DESY), Pashupati Dhakal (JLAB)

16:00 Developments of Nb₃Sn cavities and conduction-cooled cryostat at PKU

Speaker: JianKui Hao (PKU)

1 Hao_Nb3Sn_conduction_cryostat_PKU.pdf

1 Hao_Nb3Sn_conduction_cryostat_PKU.pptx

16:30 Pathway to tune sputtered Nb3Sn properties with Zr

Speaker: Malvika Tripathi (FNAL)

TTC2025_MT_Nb3Sn_with_Zr_inclusion_final.pptx

17:00 NbTiN coating of 6 GHz copper cavity

Speaker: Alan Wheelhouse (STFC)

TTC2025_NbTiN_Coating_6GHzCopperCavities_(AWheelhouse).pptx

16:00 → 17:30 WG-3

Conveners: Michiru Nishiwaki (KEK), Julien Branlard (DESY), Ryan Porter (SLAC)

Convener: Michiru Nishiwaki (KEK), Julien Branlard (DESY), Ryan Porter (SLAC)

16:00 Operation of the BEPCII SRF system

Speaker: Jianping Dai (IHEP)

20250408-TTC-dai.pptx

16:30 HEPS 500 MHz cryomodule experience

Speaker: Hongjuan Zheng (IHEP)

08 - HEPS 500 MHz cryomodule experience.pptx

17:00 Operational Issues of the SRF Modules at TPS

Speaker: Zong-Kai Liu (NSRRC)

09 - ZK-TTC25-0408.pptx

17:30 → 18:00 Break

18:00 → 19:00 CB Meeting

Convener: Eiji Kako (KEK) (KEK)

Wednesday 9 April

09:00 → 10:30 Plenary Talk

Convener: Eiji Kako (KEK) (KEK)

09:00 Latest Results and Status of SHINE Cryomodules

Speaker: Jinfang Chen (SARI) (SARI)

1 TTC2025 - SHINE Cryomodules - Jinfang Chen (SARI).pptx

09:30 Novel fabrication techniques for SRF components

Speaker: Simon Barriere (CERN) (CERN)

2 TTC2025_Novel_Fabrication_Techniques_SBMG.pptx

10:00 Overview of high efficiency RF power sources: Klystron, SSA, tubes with wide frequency range

Speaker: Zusheng Zhou (IHEP) (IHEP)

Overview of high efficiency RF power source.pptx

10:30 → 11:00 Coffee Break

11:00 → 12:30 WG-1

Conveners: Peng Sha (IHEP), Marc Wenskat (DESY), Pashupati Dhakal (JLAB).

Convener: Peng Sha (IHEP), Marc Wenskat (DESY), Pashupati Dhakal (JLAB)

11:00 Ongoing Development of Single-Spoke Resonator Type 1 Superconducting Cavities at RAON

Speaker: Heetae Kim (IBS)

47.Ongoing Development of SSR1_TTC25(WG-1 Wed 11AM)_Heetae Kim final.pdf

11:30 ITN activities in Europe

Speaker: Laura Monaco (INFN)

2 2025-04-09 -ITN in Europe_Monaco.pdf

2 2025-04-09 -ITN in Europe_Monaco.pptx

12:00 VT results on fine-grain and medium-grain 1-cell cavities in the KU/KAT and KEK collaboration

Speaker: Jongmo Hwang (KU)

3 20250409 TTC 2025_V2.pptx

11:00 → 12:30 WG-3

Conveners: Michiru Nishiwaki (KEK), Julien Branlard (DESY), Ryan Porter (SLAC)

Convener: Michiru Nishiwaki (KEK), Julien Branlard (DESY), Ryan Porter (SLAC)

11:00 Operational Experience of SRF Module in SuperKEKB with 1 A Beam Current

Speaker: Michiru Nishiwaki (KEK)

TTC2025-nishiwaki.pdf

11:30 High Current Cryomodules for Ampere Class Electron Storage Rings

Speaker: Jiquan Guo (JLAB)

High Current Cryomodules for Ampere Class Electron Storage.pptx

12:00 Open Discussion

Speaker: Michiru Nishiwaki (KEK)

EuXFEL_HOM_overheating.pptx

OpenDiscussion_HighCurrent.pptx

12:30 → 14:00 Lunch

14:00 → 15:30 WG-2

Convener: Sebastian Aderhold (SLAC), Kensei Umemori (KEK), Stephane Berry (CEA)

14:00 Field Emission activities at INFN-LASA

Speaker: M. Bertucci (INFN-LASA)

WG-2 Field emission activities at INFN-LASA.pptx

14:15 Xray measurements at CEA for ESS cavities

Speaker: Henry Przybilski (ESS)

Instrumentation for field emission analysis on ESS cryomodules_PP_EC_CM.pptx

14:30 Observation of the Field Emission Phenomena with RIKEN SRILAC

Speaker: N. Sakamoto (RIKEN)

TTC2025-SRILAC-sakamoto.pptx

14:45 Particle migration and transport mechanisms

Speaker: A. Mahon (TRIUMF)

AMahon_TTC2025.pdf

15:00 Particle migration and material statistics in CEBAF

Speaker: A.-M. Valente (Jefferson Lab)

5 TTC25_Daejeaon_AMVF.pdf

15:15 Discussion

14:00 → 15:30 WG-4

Convener: Hongtao Hou (SARI), Crispin Contreras (Fermilab), Alan Wheelhouse (STSF)

14:00 Design of a 3rd-harmonic superconducting cavity for HALF

Speaker: Ye-Long Wei (USTC)

01 - YL Wei - Design of a 3rd-harmonic superconducting cavity for HALF-20250409.pptx

14:20 R&D of 3rd harmonic cavity for TPS Operation

Speaker: Ming-Chyuan Lin (NSRRC)

02 - MC Lin - TTC2025.pptx

14:40 The stand-alone cryomodule of 3rd harmonic cavity for synchtotron light source

Speaker: Jun-Ho Han (KAT)

TTC meeting 2025_Junho Han (WG4-Wed 1440) (1).pdf

15:00 Experience with the 3.9GHz cryomodules in the LCLS SC linac

Speaker: Sebastian Aderhold (SLAC)

TTC25_WG4_Aderhold.pptx

15:20 Discussion

Discussion_3rd CM.pptx

15:30 → 16:00 Coffee Break

16:00 → 17:30 WG-2

Convener: Sebastian Aderhold (SLAC), Kensei Umemori (KEK), Stephane Berry (CEA)

16:00 Ozone-gas processing as an in-situ cleaning technique for cryomodules

Speaker: R. Ruber (Jefferson Lab)

20250409 TTC2025 Ozone Processing.pdf

16:15 Mitigating field emission in SSR2 cryomodules for PIP-II

Speaker: M. Parise (Fermilab)

TTC 2025 - Mitigating field emission in SSR2 cryomodules for PIP-II - Mattia.pdf

16:30 Clean room protocols and robotic techniques

Speaker: S. Berry (CEA)

2025 04_TTC_Daejeon_BERRY-final.pptx

16:45 Clean room protocols and robotic techniques for PIP-II

Speaker: C. Narug (Fermilab)

Clean Room Protocols and Robotic Techniques for PIP-II.pptx

17:00 Plasma processing on SSR cavities

Speaker: Mattia Parise (FNAL)

TTC2025_PlasmaSSR_v2.pdf

17:15 Plasma processing (SNS)

Speaker: Sang-Ho Kim (ORNL)

Plasma_Processing_SNS.pptx

16:00 → 17:30 WG-4

Convener: Hongtao Hou (SARI), Crispin Contreras (Fermilab), Alan Wheelhouse (STSF)

16:00 Progress and status of SHINE 3.9GHz cavities/cryomodule

Speaker: Xiao-Wei Wu (ZJLab)

WG4-Xiaowei Wu-Progress and status of SHINE 3.9GHz cavities and cryomodule.pdf

16:20 Progress and first operation with beam of SHINE 1.3GHz 9-cell Twin-FPC cryomodule

Speaker: Hong-Tao Hou (SARI)

02 - HHou - TTC2025-twin FPC CM at SHINE-Hou.pdf

16:40 SRF photocathode gun for BNL Coherent electron Cooling

Speaker: Binping Xiao (BNL)

SRF_gun_TTC2025.pptx

17:00 CW photoinjector for the future CW and HDC EuXFEL

Speaker: Elmar Vogel (DESY)

CW Photoinjector for the HDC EuXFEL @ TTC Meeting IRIS-IBS.pdf

17:20 Discussion

17:30 → 18:00 Break

18:00 → 19:00 TB Meeting

Convener: Hiroshi Sakai (KEK) (DESY)

Thursday 10 April

09:00 → 10:30 Plenary Talk

Convener: Jie Gao (IHEP) (Institute of High Energy Physics)

09:00 Overview of SRF Linac for IFMIF-DONES 5MW Accelerator Project

Speaker: Nicolas Bazin (CEA) (CEA)

TTC_2025_Bazin.pptx

09:30 Overview of fundamentals of LLRF control

Speaker: Curt Hovater (JLab) (JLab)

2 Fundamentals of LLRF Control [Autosaved].pptx

10:00 Recent progress of LLRF

Speaker: Rama Bachimanchi (JLab) (JLab)

3 TTC_Korea_2025_LLRF_Progress_RB.potx.pptx

10:30 → 11:00 Coffee Break

11:00 → 12:30 WG-2

Convener: Sebastian Aderhold (SLAC), Kensei Umemori (KEK), Stephane Berry (CEA)

11:00 RAON

Speaker: Y. Kim (IBS)

1 FE_at_RAON_ykkim_250410.pptx

11:15 EU XFEL

Speaker: J. Branlard

2 TTC2025-WG2_J.Branlard.pptx

11:30 LCLS-II

Speaker: R. Porter

3 WG2_FacilityComparison_SLAC.pptx

11:45 TRIUMF

Speaker: Z. Yao

TTC WG2 FE ZY.pdf

TTC WG2 FE ZY.pptx

12:00 RIKEN

Speaker: K. Ozeki

WG2_ozeki.pdf

12:15 Discussion

11:00 → 12:30 WG-4

Convener: Hongtao Hou (SARI), Crispin Contreras (Fermilab), Alan Wheelhouse (STSF)

11:00 Experience of Developing Highly Reliable Tuner Components (Piezo Actuators and Cold Stepper Motor Actuators) for SRF Linac.

Speaker: Crispin Contreras (Fermilab)

Crispin_Contreras_TTC2025.pptx

11:20 HOM Damper and FPC Design for BNL EIC 197MHZ CRAB Cavity

Speaker: Binping Xiao (BNL)

CCforEIC_TTC2025.pptx

11:40 HOM Couplers for HL-LHC Crab Cavities: Manufacturing Challenges and Recent Developments

Speaker: Simon Barrière (CERN)

HOM_Couplers_SB_WG4_TTC2025.pptx

12:00 HOM couplers performance and adjustment experience of SHINE 1.3GHz CMs

Speaker: Xiao-Yun Pu (SARI)

04 - SYPu - TTC202504-HOM couplers performance and adjustment experience of SHINE 1.3GHz CMs-Xiaoyun PU.pptx

12:20 Discussion

TTC2025_WG4_Discussion.pptx

12:30 → 14:00 Lunch

14:00 → 15:30 WG-2

Convener: Sebastian Aderhold (SLAC), Kensei Umemori (KEK), Stephane Berry (CEA)

14:00 JLAB

Speaker: R. Ruber

20250410 TTC2025 CEBAF Field Emission Experience (rs).pdf

14:15 KEK

Speaker: K. Umemori

TTC_WG2_umemori_v2.pdf

14:30 SNS

Speaker: S. Kim

Field_emission_SNS.pptx

14:45 Discussion

4 WG2_SlidePrompts.pptx

14:00 → 15:30 WG-4

Convener: Hongtao Hou (SARI), Crispin Contreras (Fermilab), Alan Wheelhouse (STSF)

14:00 HOM damper and FPC for the EIC electron storage ring (ESR) 591 MHz single cell cavity

Speaker: Jiquan Guo (JLAB)

01 - JGuo - HOM damper and FPC for the EIC ESR.pptx

14:20 RFD cryomodule build for SPS test

Speaker: Nik Templeton (STFC)

TTC2025 RFD-SPS Cryomodule.pptx

14:40 Preparations for Hi-Lumi RFD Cryomodule Assembly at TRIUMF

Speaker: Zhongyuan Yao (Triumf)

TTC WG4 RFD CM ZY.pdf

TTC WG4 RFD CM ZY.pptx

15:00 Frequency, Length, and Inner Surface Quality Control of Superconducting Cavities for Mass Production

Speaker: Zhi-Hui Mu (IHEP)

04 - Z H Mu- 2025TTC-Batch Production of 1.3 GHz TESLA Cavities at HERT.pptx

15:20 Discussion

15:30 → 16:00 Coffee Break

16:00 → 17:30 Hot Topics: Hazard Mitigation for SRF Accelerators and Cryogenics

Title: Hazard Mitigation for SRF Accelerators and Cryogenics

Convener: Akira Yamamoto (KEK & CERN) (KEK and CERN)

16:00 Introduction for "Hazard Mitigation for SRF Accelerators and Cryogenics"

Speaker: Akira Yamamoto (KEK & CERN) (KEK and CERN)

TTC-HT-Session, Introduction-250410a.pdf

TTC-HT-Session, Introduction-250410a.pptx

16:05 Consequences of big earth quake resulting in damages in accelerators and associated systems including cryogenics

Speaker: Yasuhiro Kondo (JAEA/J-PARC), Yasuhiro Makida (KEK/J-PARC) (J-PARC)

250313_ttc2025_earthquake_resulting_kondo.pptx

16:30 Helium management during emergency events for the LCLS superconducting linac at SLAC

Speaker: Sebastian Aderhold (SLAC), Eric Fauve (SLAC) (SLAC)

TTC25_HotTopic_SLAC_v3.pptx

16:55 Hazard mitigation and Helium conservation for future large-scale SRF-based Accelerator Cryogenics

Speaker: Kota Nakanishi (KEK), Boyan-Kaloyanov Naydenov (CERN) (KEK)

TTC_nakanishi - BN - ay.pptx

17:20 Discussion and Summary

Speakers: AKIRA YAMAMOTO (KEK and CERN), Akira Yamamoto (KEK & CERN)

15 TTC-HT-Session, Discussions-250410b.pdf

15 TTC-HT-Session, Discussions-250410b.pptx

17:30 → 18:00 Break

18:00 → 20:00 Dinner

Friday 11 April

08:00 → 09:00 BUS (IBS to IRIS-RAON Site); Departure Time at IBS Science Culture Center: 8:10-8:30 AM

Departure times: 8:10, 8:20, 8:30 am
- Late departure(option): 9:00, 10:00 am

09:00 → 10:30 Special Seminars

Convener: Myeun Kwon (IBS) (ibs)

09:00 Science with Rare Isotopes: Unlocking the Door to the Invisible World

Speaker: Prof. Seonho Choi (SNU) (Seoul National University)

09:45 Axion research activities in Korea

Speaker: Dr SungWoo Youn (IBS) (IBS-DMAG, IBS Dark Matter Axion Group)

TTC2025_YOUN.pptx

10:30 → 11:00 Group Photo (#2) & Coffee Break

11:00 → 12:30 Summary

Convener: Hans Weise (DESY) (DESY)

11:00 WG-1 Summary

Speaker: WG-1 conveners

Summary_WG1.pptx

11:15 WG-2 Summary

Speaker: WG-2 conveners

2025 04_TTC_Daejeon_WG-2_Summary_v2.pptx

11:30 WG-3 Summary

Speaker: WG-3 conveners

WG3 summary.pptx

11:45 WG-4 Summary

Speaker: WG-4 conveners

TTC2025_WG4_Summary_Talk.pptx

12:00 TTC Technical Board Report

Speaker: Hiroshi Sakai (KEK)

Summary TTC-TB meeting Apr 09_2025_PRESENTATION_final.pdf

12:15 TTC Collaboration Board Report

Speaker: Eiji Kako (KEK) (KEK)

CB report - Kako, Report of TTC CB meeting, 2025 April 11.pptx

12:30 → 13:00 Closing

Convener: LOC members (IBS) (IBS)

Opening-TTC2025-YeonseiChung(0409)_edit.pptx

13:00 → 14:00 Lunch: Lunch boxes will be provided

14:00 → 16:30 Site Tour