WG1: Performance Degradation and Cures (L. Lilje, J. Mammosser, H. Sakai)
The general aim of WG1 is to gather and analyze the recorded degradations (or improvements) between vertical cavity tests and cryomodule performance for major accelerator projects (both high and low beta). Also gather data on any further degradation (or improvement) in the beam line and over time. What are the dominant limiting aspects - field emission, quench, Q-degradation, administrative limits, something else? What measures have been tried to cure the degradations, and how successful are these attempts? What efforts are underway or recommended to minimize contamination during cryomodule assembly and during connection to the beam line, such as particle-free vacuum components next to cold linac sections. For their TTC summary talk on the last day, co-chairs should pull together and summarize the key experiences and observations in these areas, as well as some of the needed developments. Please do not make your summary talk a collection of slides from the presentations in the WG, but rather organize and synthesize your talk along the lines of common experiences and needed developments.
WG2: Protons and Ions Accelerators (G. Devanz, R. Laxdal, P. Michelato)
Major initiatives are well underway for ion accelerators for nuclear astrophysics, such as FRIB, RAON and others. With the success of SNS, high intensity proton accelerator projects are progressing, such as ESS, PIP-II, IndianSNS, along with ADS ambitions, such as CADS and IADS. The aim of WG2 is to address the major on-going issues for each type of accelerator, how these issues are being addressed, as well as the needed developments. Demonstrated and needed advances in couplers and tuners for both accelerator classes should be included. Please avoid presentations that give project status summaries - more suited to other conferences. Please do not make your WG summary talk on the last day a collection of slides from the presentations in the WG, but rather organize your talk along the lines of important accomplished SRF advances and needed developments.
WG3: High current and CW accelerators (S. Belomestnykh, J. Hao, E. Jensen)
With growing interest in a future Higgs factory e+ e- collider - either via the ILC path or the FCC-ee path - co-chairs should identify the key issues for SRF for such accelerators, and encourage short presentations that address these issues. Similarly SRF for CW light sources such as ERLs have seen significant advances, so that major issues for this topic should be addressed. Include storage rings light sources issues as appropriate. Demonstrated and needed advances in couplers and tuners for both accelerator classes should be included. For their TTC summary talk on the last day, co-chairs should pull together and summarize the key developments in these areas, and the remaining necessary developments. Please do not make your summary talk a collection of slides from the presentations in the WG, but rather organize your talk along the lines of important accomplished advances and needed developments.
WG 4: The Performance Frontier (S. Aull, A. Grassellino, K. Umemori)
Three working groups have been active under the TTC umbrella: High Q for cryogenic cost reduction for CW accelerators at medium gradients, High Gradients with Nb and Nb3Sn, and Thin film Nb-Cu for cost reduction. Please include on-going efforts on composite Nb-Cu. Explorations at these frontiers will benefit medium-term and far-term future accelerators under discussion. Co-chairs should encourage presentations that will lead to a summary of on-going efforts underway for the three active WGs. Breakthroughs in these areas should get special attention. In your final summary please make an assessment of the probability of success for improved understanding, and highlight results for high Q, gradients > 50 MV/m and successful elimination of the Q-slope in Nb-Cu. Please do not make your summary talk a collection of slides from the presentations in the WG, but rather organize your talk along the lines of accomplished advances and needed developments.
