Report of TTC-TB meeting at INFN-Milano 2018, February 09 Co-chairs Wolf-Dietrich Moeller (DESY) Eiji Kako (KEK) W.-D. Moeller (DESY) E. Kako (KEK) TTC-TB meeting at INFN-Milano, 2018' February 09

TTC-TB meeting at INFN-Milano, 2018' February 09 Outline Member list Report from SPC meeting for TTC at INFN-Milano Discussions Topics for in-depth discussion in the next TTC Proposal of WG-organization in the next TTC Others W.-D. Moeller (DESY) E. Kako (KEK) TTC-TB meeting at INFN-Milano, 2018' February 09

TTC-TB meeting at INFN-Milano, 2018' February 09 TTC-TB member list Co-chairs E. Kako (KEK) W.-D. Moeller (DESY) Cavity and couplers S. Bousson (CNRS-Orsay) S. Calatroni (CERN) G. Ciovati (Jlab) R.L. Geng (JLab) C. Ginsburg (FNAL) J. Hao (PKU) R. Laxdal (TRIUMF) D. Reschke (DESY) A. Romanenko (FNAL) K. Umemori (KEK) J.Y. Zhai (IHEP) RF and tuning M. Champion (SNS) A. Wheelhouse (STFC) F. Gerigk (CERN) Cryomodule and cryogenics C. Madec (CEA) H. Nakai (KEK) T. Peterson (FNAL) P. Pierini (INFN) Integration and operation H. Hayano (KEK) Sang-Ho Kim (SNS) M. Liepe (Cornell) S. Schreiber (DESY) Honoris causa J. Mammosser (SNS) C. Pagani (INFN) M. Ross (SLAC) H. Weise (DESY) A. Yamamoto (CERN/KEK) S. Belomestnykh (FNAL) Black = participant (17) Gray = absence (13) Total = 30 (EU=11, NA=12, Asia=7) W.-D. Moeller (DESY) E. Kako (KEK) TTC-TB meeting at INFN-Milano, 2018' February 09

SPC meeting for TTC at Milano Scientific Program Committee meeting by Vidyo Remote System ; (SPC members; Carlo, Hasan, Paolo, Wolf-Dietrich, Kako, Hans, Sergey, Akira) 1st SPC meeting, 2017’ August 29th (Tue) 2nd SPC meeting, 2017’ September 08th (Fri) 3rd SPC meeting, 2017’ September 22nd (Fri) 4th SPC meeting, 2017’ September 29th (Fri) 5th SPC meeting, 2017’ October 06th (Fri) 6th SPC meeting, 2017’ October 20th (Fri) 7th SPC meeting, 2017’ October 27th (Fri) 8th SPC meeting, 2017’ November 09th (THu) 1st /9th SPC meeting with WG conveners, 2017’ November 22nd (Wed) 2nd /10th SPC meeting with WG conveners, 2017’ December 01st (Fri) 3rd /11th SPC meeting with WG conveners, 2017’ December 15th (Fri) 4th /12th SPC meeting with WG conveners, 2018’ January 19th (Fri) 5th /13th SPC meeting with WG conveners, 2018’ February 01st (Thu) Thanks Carlo and INFN-team for strong leadership !! W.-D. Moeller (DESY) E. Kako (KEK) TTC-TB meeting at INFN-Milano, 2018' February 09

TTC-TB meeting at INFN-Milano, 2018' February 09 Suggested topics for in-depth discussion in TTC at MSU From a report of the previous TTC-TB meeting at MSU/FRIB. “where & when” of the next TTC meting is not decided. Somewhere in Europe, around 1 year later. 　Discussions to input: Commissioning and operational experience of SRF Accelerators LLRF for SRF systems including commissioning , operation, microphonics and interlock for quench protection Gas distribution and dislocation in the beam line vacuum for cold Linacs and consequences for performance degradation. Discussion of the Niobium specification together with manufacturer in respect of high Q developments and pressure vessel code Discussion of high pressure code for cavity and cryomodule design Topical meetings to be shown on the Web page and reports should be given: High Q, High gradient, Thin film W.-D. Moeller (DESY) E. Kako (KEK) TTC-TB meeting at INFN-Milano, 2018' February 09

WG-organization in TTC at Milano Two parallel sessions: 4 WGs WG1: CW Operation Challenges; Cavity, High-Q Genfa Wu (FNAL), Jiyuan Zhai (IHEP), Axel Neumann (HZB) WG2: CW Operation Challenges; Couplers, Tuners, Modules Yuriy Pischalnikov (FNAL), Yasuchika Yamamoto (KEK), Rocco Paparella (INFN) WG3: Commissioning Experience; LLRF, Micro-phonics Curt Hovater (JLab), Guirong Huang (IMP), Mathieu Omet (DESY) WG4: Pulsed Operation Challenges; High-G, (high-Q), High-P Anna Grassellino (FNAL), Kensei Umemori (KEK), Lea Steder (CEA) Hot-topic: Performance recovery; Cavity, Modules, Linacs Emmy Sharples (HZB), Hiroshi Sakai (KEK), Paolo Michelato (INFN) Thanks to WG conveners !! W.-D. Moeller (DESY) E. Kako (KEK) TTC-TB meeting at INFN-Milano, 2018' February 09

Schedule of TTC meeting at Milano 3.5 days 4 days W.-D. Moeller (DESY) E. Kako (KEK) TTC-TB meeting at INFN-Milano, 2018' February 09

Participants and WG-organization in TTC meeting Location Date Participants Parallel WGs INFN-Milano 2018, Feb. 178 2-para 4 WGs MSU 2017, Feb. 123 2-para. CEA-Saclay 2016, July 127 SLAC 2015, Dec. 130 KEK 2014, Dec. 108 6 WGs DESY 2014, Mar. 129 3-para. 9 WGs JLab 2012, Nov. 154 plenary IHEP 2011, Dec. 96 3 WGs W.-D. Moeller (DESY) E. Kako (KEK) TTC-TB meeting at INFN-Milano, 2018' February 09

TTC-TB meeting at INFN-Milano, 2018' February 09 Proposal of WG topics for in-depth discussion in the next TTC How do improve the present specification for bulk Niobium? What should be the specification for large grain Niobium? (in respect to pressure vessel code, how to design the machine to be able to use large grain Niobium ?) Collect and discuss information about the pressure vessel code from different projects and regions What are the performance limits for low beta resonators like: QWR, HWR and spoke cavities based on experience? What are the real performance limitations for cavities? Vertical test Module test Linac operation W.-D. Moeller (DESY) E. Kako (KEK) TTC-TB meeting at INFN-Milano, 2018' February 09

TTC-TB meeting at INFN-Milano, 2018' February 09 Proposal of WG topics for in-depth discussion in the next TTC Field emission measurements: How to measure? How to define limits? Commissioning and operational experience of SRF Accelerators (also small machines!) Follow up the development in high Q and high gradient. Gas distribution and dislocation in the beam line vacuum for cold Linacs and consequences for performance degradation. W.-D. Moeller (DESY) E. Kako (KEK) TTC-TB meeting at INFN-Milano, 2018' February 09

TTC-TB meeting at INFN-Milano, 2018' February 09 Proposal of WG-organization in the next TTC Program: First choose the discussion points (2-3) for the working groups than the speaker Presentation 2/3 and 1/3 discussion, (for more discussion time) W.-D. Moeller (DESY) E. Kako (KEK) TTC-TB meeting at INFN-Milano, 2018' February 09

Thank you for your attention. W.-D. Moeller (DESY) E. Kako (KEK) TTC-TB meeting at INFN-Milano, 2018' February 09