1. Welcome & Introduction
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Hans Weise, DESY
February 5th, 2019

2. The mission of the TESLA Technology Collaboration
The mission of the TESLA Technology Collaboration is
to advance SRF technology 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.
The TTC organizes regular collaboration meetings where new developments are reported, recent findings are discussed and technical issues are concluded. This time, TTC meeting is hosted by TRIUMF on February

3. The list of work packages chosen in the Scientific Program Committee includes: WG-1; Performance limitation in operational facilities Multipacting, Field emission, RF stability WG-2; Cold test diagnostics and novel processing methods WG-3; Progress on the development in high Q and high gradient WG-4; Cryomodule design – issues and solutions Hot topic session: How do we safely transport cryomodules around the world? Rob KIEFL (UBC/TRIUMF) muSR and beta-NMR - probing the superconducting state Anton BARTY (CFEL/DESY) First Science from XFEL

4. The actual TTC Meeting was prepared in an enthusiastic way and with great care… (13 SPC Video Meetings!!!)
Bob Laxdal (TRIUMF), TTC Co-chair and LOC-chair, and his team including Katrin Lando / DESY and the TTC Meeting Scientific Program Committee chaired by Eiji Kako (KEK) & Wolf-Dietrich Moeller (DESY)
SPC
WP Leaders
Hans Weise (DESY), TTC-chair
Bob Laxdal (TRIUMF)
Eiji Kako (KEK)
Wolf-Dietrich Moeller (DESY)
Sergey Belomestnykh (FNAL)
Akira Yamamoto (KEK/CERN)
Paolo Pierini (ESS)
Rong-Li Geng (Jefferson Lab) Julien Branlard (DESY)
Yuan He (IMP)
Martina Martinello (FNAL) Oliver Kugeler (Helmholtz Zentrum Berlin)
Alex Romanenko (FNAL)
Marc Wenskat (DESY)
Kensei Umemori (KEK)
Tom Nicol (FNAL)
Naruhiko Sakamoto (RIKEN)
Stephane Berry (CEA-Saclay)
Tom Peterson (SLAC)
Genfa Wu (FNAL)
Felix Schlander (ESS)
THANK YOU!!!

5. Number of TTC Meeting Participants
MILANO
RIKEN
143 participants
22% from industry
TRIUMF
109 participants
4% from industry

6. WG-1; Performance limitation in operational facilities
Rong-Li Geng (Jefferson Lab) Julien Branlard (DESY) Yuan He (IMP)
Multipacting, Field emission, RF stability
The scope of this working group is to discuss the known performance limitations of operational facilities including both elliptical and non-elliptical variants – the operational experience can include longer term operation of test facilities. The range of discussion should include:
Cavity Performance experience – safe limits
Multipacting issues – limitations and mitigations
Field emission
Trapped flux - considering local sources (active magnets) and cooldown dynamics
voltage and phase stability – microphonics, LFD, Vector sum (pulsed and cw) • 4K vs 2K operation

7. WG-2; Cold test diagnostics and novel processing methods
Martina Martinello (FNAL) Oliver Kugeler (Helmholtz Zentrum Berlin)
This working group is asked to consider two main topics. The first topic is to discuss the various cold test diagnostics both installed in vertical and horizontal test facilities but also in working cryomodules. A second topic is to discuss new ideas in the field of cavity processing. The range of discussion should include:
Magnetic field measurement and mapping
Temperature measurement and mapping
2nd sound quench identification
Field emission radiation monitors
Coupler protection o In module diagnostics
Green surface polishing
Vertical EP
Plasma processing (TEM mode cavities, CMs)
Use of robotic engineering and assembly

8. WG-3; Progress on the development in high Q and high gradient
Alex Romanenko (FNAL) Marc Wenskat (DESY) Kensei Umemori (KEK)
Bulk Niobium is at present the most common material for superconducting RF cavities in accelerator applications. Over the last several years new heat treatments including doping have been used to reach unprecedented performance of Niobium cavities in terms of High Q and/or High Gradient. Most of the work has concentrated on cavities operating at 1.3GHz driven by cw applications like LCLS-II and future pulsed operation like the ILC. The scope of this working group is to discuss the most recent results with respect to pushing niobium towards Higher Q and Higher Gradient. Discussions should include:
Progress on technical performance of various heat treatments with and without doping to deliver high Q and/or high gradient performance
Progress on understanding the underlying mechanisms at work in the various treatments including sample analysis and theory
New results at other cavity frequencies that could shed light on the core understanding

9. WG-4; Cryomodule designs – issues and solutions
Tom Nicol (FNAL) Naruhiko Sakamoto (RIKEN) Stephane Berry (CEA-Saclay)
Many challenging projects are on the go or planned requiring both elliptical and non-elliptical cavity technology. To face the requirements of each application several different cryomodule approaches have been developed or are being proposed. They include long TESLA style pipe, top-loading box, pipe with strongback, pipe with space frame, bottom up box, side load box. The aim of this working group is to address the issues and difficulties for the various cryomodule designs. Topics for consideration are:
Assembly
Alignment
Cw vs pulsed operation
Microphonics
Module transport
Production and operational costs
Cryogenic design

10. Hot Topic; How do we safely transport cryomodules around the world?
Tom Peterson (SLAC) Genfa Wu (FNAL) Felix Schlander (ESS)
Modern projects are relying more and more on having cryomodules assembled in one facility and having them shipped either across the country or even between continents to the final accelerator installation. The recent negative experience in transporting a LCLS-II cryomodule from FNAL to SLAC has raised cryomodule transportation as a major concern for LCLS-II but also for other projects that need to consider inter-facility transport. The mandate of the Hot Topic is to open a discussion on the topic of cryomodule transport considering the following topics:
Community experience to date
Lessons learned from LCLS-II
Cryomodule design considerations
Shipping container design and considerations
Means of shipping – land, air, sea

11. https://indico.desy.de/indico/event/21337/timetable

12. The mission of the TESLA Technology Collaboration
The TESLA Technology Collaboration supports and encourages free and open exchange of scientific and technical knowledge, expertise, engineering designs, and equipment. Therefore:
We see exchange between many projects, in all phases
Scientific exchange is of utmost importance
This time we are missing countries due to non-scientific reasons
We profit from shared IP of many collaborators
we like IP sharing more than IP protection BUT
industry needs the right to protect their little tricks
IP should be respected in the sense that knowledge transfer is nice and a great goal but should always be done in mutual agreement
we like knowledge transfer as part of collaborative work