05/12/2011O. Napoly1 TESLA Technology Collaboration JLab, 5-8 November 2012 O.Napoly, CEA-Saclay TTC Chairman Introduction and update since last meeting

The TTC meeting is hosted in Newport News, by the Thomas Jefferson National Accelerator Facility. Many thanks to: Charles Reece, JLab for chairing the meeting and the LOC. Many thanks to: Fulvia Pilat, John Mammosser, Robert Rimmer and Andrew Hutton for making it possible. 05/12/2011O. Napoly2

TTC Members 05/12/2011O. Napoly3

TTC Members 05/12/2011O. Napoly4 New MoU’s signed since last meeting TTC membership consists of 55 Institutes, from 14 countries and 2 International Organisations thanks to Katrin Lando (DESY) for her administrative support The TTC Web Page has been upgraded to includeWeb Page SRF accelerators in Europe SRF facilities at FNAL and CEA It should be completed…

TTC committees new membership TTC Deputy Chair: Camille Ginsburg TTC Executive Committee: Fulvia Pilat, Hans Weise, Akira Yamamoto Technical Board Chair: Nobu Toge Deputy-Chair: Wolf-Dietrich Möller Thank you for accepting to share the responsability. 05/12/2011O. Napoly5

New Scientific Developments Since the last TTC meeting in December 2011 Two major discoveries… 05/12/2011O. Napoly6 the discovery of the Higgs boson, m h 0  126 GeV the measurement the Neutrino mixing angle,  13  9°

New Scientific Developments The discovery of the Higgs Boson, at the LHC and the TeVatron 05/12/2011O. Napoly7 Higgs, Brout, Englert h 0  Z 0 Z 0 * m h 0 ~126 GeV

New Scientific Development n°1 Like the major past scientific findings, the discovery of the Higgs boson brings Perspective to Mankind: our world obeys U(2)-symmetric laws of dynamics, despite the so-far unresolved U(1) symmetry. 05/12/2011O. Napoly8 ‘U(2) rotation’ symmetric Higgs Lagrangian. ‘U(2) rotation’ asymmetric low- energy state. courtesy P. Oddone

The Current Accelerator Facility The LHC uses SCRF Technology derived from LEP2 05/12/2011O. Napoly9 cf E. Ciapala at TTC Beijing 8 SC cavities/beam – total 16, in 4 cryomodules at IR4 2 MV nominal per cavity, 5.5 MV/m nominal gradient Low R/Q: 44  Variable power coupler, High Power handling 11,000 < Q ext < 200,000 One klystron per cavity, rating 330 kW Cryostat section Main Coupler Port HOM Port Bare cavity

New Development n°1 leads to … Elucidating the Higgs mechanism of spontaneous electroweak symmetry breaking (i.e. from which grape is made the bottle ?) may bring the key to the Grand Unification (SU(5), O(10),…). 05/12/2011O. Napoly10 The answer will come from one decade of LHC runs, or from an e+e- collider.

… New Accelerator Directions To elucidate the Higgs mechanism of spontaneous symmetry breaking, all three main contenders use extremely demanding SCRF technology: High Luminosity LHC: main RF and RF crab cavities with high accuracy of RF control A circular Higgs Factory collider: 10 to 20 GV of CW SCRF A linear Higgs Factory collider, the ILC: 250 GV of pulsed SCRF duty cycle (~ 0.5 %) 05/12/2011O. Napoly11

New Development n°2 leads to… The Measurement of the Neutrino mass mixing angle  13 05/12/2011O. Napoly12 This is a major step towards uncovering the Neutrino mass hierarchy and CP violation in the Lepton sector  discovery

… New Accelerator Directions A long baseline experiment pointing a SuperBeam on a Megaton detector is the next step: a powerful multi-MW multi-GeV SCRF proton linac (Project X, SPL, … ) is the most favourable solution. 05/12/2011O. Napoly13

My Idea of the TTC The TESLA Technology Collaboration is at the same time: 1. a “forum” of discussions and exchanges on Superconducting Radio Frequency (SCRF) systems cutting edge developments, from the R&D level to running accelerator aspects and, in return, 2.a “think tank” capable of providing top level and experienced advices and expertise to SCRF accelerator projects, from the design phase to the operation stages, including optimisation and upgrades. The TTC “forum” culminates during the TTC meetings whose success is guaranteed by the excellence of the presentations, intellectual debates and technical findings that it convenes, by free will, from the members of the TTC institutes. The TTC “think tank” is a unique body comprising most of the major accelerator centres and accelerator science institutes in the world, addressing a broad range of applications in scientific fundamental research. 05/12/2011O. Napoly14

Priorities of TTC until /12/2011O. Napoly15 Performances of SCRF systems

Priorities of TTC : /12/2011O. Napoly16 Performances Applications of SCRF systems

A proposal for TTC Priorities /12/2011O. Napoly17 Performances ApplicationsEconomics of SCRF systems ‘ APE ’

TTC Jlab Meeting Scientific Program Programme Committee: Camille Ginsburg (FNAL), Olivier Napoly (CEA), Wolf-Dietrich Möller (DESY), Charles Reece (Jlab), Nobu Toge (KEK) WG1: ‘SRF systems and components for high-intensity or CW beam operation’ Conveners: Yuan He (IMP-CAS), Robert Laxdal (TRIUMF), Sébastien Bousson (IPN-Orsay) Several projects of high intensity hadron linear SCRF accelerators around the world are in operation, construction or design. They involve many forms of SRF cryomodules based on a variety of low, medium and high beta superconducting RF resonators designed to withstand long pulse or CW beam operation. Working Group n°1 should organize a review and a discussion about the recent designs and the recent developments, based on experimental results on cavity RF tests, problems and technical solutions for cavity fabrication, coupler and tuner limitations, cryomodule assembly and RF performance. WG-1 should also be opened to neighboring topics like experience in low-beta machine operation and upgrades, cold RF measurements and coupler test benches, or other CW applications. 05/12/2011O. Napoly, TTC Chair18

TTC Jlab Meeting Scientific Program WG2 conveners: ‘High gradient and high Q0 cavity developments’ Conveners: Yasuchika (Kirk) Yamamoto (KEK), Gigi Ciovati (JLab), Denis Kostin (DESY) The ability to establish high accelerating fields during long or CW pulses at affordable cooling power, is the root of the success of the accelerator SRF technology. Improving the performance of SCRF cavities is a longstanding and continuous objective of the TTC which encompasses understanding the physics of SRF surfaces, the design of RF resonators, the techniques for cavity fabrication and preparation, the surface investigation devices and the instrumentation at test facilities, etc… Working Group n°2 should aim at continuing this investigation by reviewing and discussing the current trends and experimental results obtained in the past year. WG-2 should also be opened to neighboring topics in the area of cavity performance and RF instrumentation. WG3 conveners: ‘Developments of specialized cavity systems’ Conveners: Eiji Kako (KEK), Mathias Liepe (Cornell University), Peter McIntosh (STFC) New applications of the SRF technology have led to the recent and innovative development of specialized cavity systems which still require design, R&D and prototyping work in order demonstrate their promises, notably SCRF guns, SRF systems for ERLs and, transverse deflecting cavities (crab cavities). WG-3 should aim at reviewing the progress in this innovative field of research by presenting the most recent design optimizations, R&D realizations and prototyping results. WG-3 should also be opened to neighboring topics presenting a similar character of innovation. 05/12/2011O. Napoly, TTC Chair19

TTC Jlab Meeting Scientific Program WG4 conveners: ‘Towards cost-effective SRF - in both construction and operation’ Conveners: Hitoshi Hayano (KEK), Joe Preble (JLab), Roland Garoby (CERN) Containing or reducing the cost of SRF technology is a key to its application to large accelerators, and even to small facilities. In the continuity of WG-3 at TTC 2011 in Beijing which discussed potential ways to reduce cryogenic power and cryogenics cost, Working Group n°4 should attempt to review and evaluate ways to moderate the cost of the superconducting RF accelerators, including the RF sources and cryogenics. This includes: a) the fabrication costs of SRF components, in small or large series b) the operation costs of the SC RF accelerating systems c) the potential for energy savings and energy recovery. WG-4 should also be opened to neighboring topics like industrialization, or the impact of pressure vessel directives. 05/12/2011O. Napoly, TTC Chair20

Technical Board Mission According to the MoU of TTC: “the Technical Board TB shall provide advice to the Collaboration on technical activities towards reaching the goals of the Collaboration Mission. To this end, the TB will: compile information on the technology activities in different technical areas, provide findings and recommendations to the CB.” These are very abstract goals. My proposal: the Technical Board attempts 1) to digest the findings, debates and technical needs from the meeting, 2) to highlight the most interesting paths of progress, within the APE triangle, 3) to propose developments or experimental tests to explore these paths. A long term topic suggested from this Meeting on : Clean-room assembly procedures as a key to cryomodule (counter-) performance 05/12/2011O. Napoly, TTC Chair21