TH2A —  Plenary Session 10   (20-Sep-18   11:00—12:30)
Chair: S. Choroba, DESY, Hamburg, Germany
Paper Title Page
TH2A01 Nitrogen Infusion R&D for CW Operation at DESY 652
  • M. Wenskat, A.D. Dangwal Pandey, B. Foster, T.F. Keller, D. Reschke, J. Schaffran, S. Sievers, N. Walker, H. Weise
    DESY, Hamburg, Germany
  • C. Bate, G.D.L. Semione, A. Stierle
    University of Hamburg, Hamburg, Germany
  • B. Foster
    University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
  • B. Foster
    Oxford University, Physics Department, Oxford, Oxon, United Kingdom
  The European XFEL cw upgrade requires cavities with reduced surface resistance (high Q-values) for high duty-cycle while maintaining high accelerating gradient for short-pulse operation. To improve on European XFEL performance, a recently discovered treatment is investigated: The so called Nitrogen-infusion. The recent test results of the cavity based R&D and the progress of the relevant infrastructure is presented. The aim of this approach is to establish a stable, reproducible recipe and to identify all key parameters for this process. In parallel, advanced surface analyses, such as SEM/EDX, TEM, XPS, XRR, GIXRD and TOF-SIMS, of samples after in-situ treatment, cut-outs of cavities and samples treated together with cavities are done. The aim of this approach is to understand the underlying processes of the material evolution, resulting in the improved performance. Results of these analyses, their implications for the cavity R&D, and next steps are presented.  
slides icon Slides TH2A01 [4.597 MB]  
DOI • reference for this paper ※  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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Spoke Cavity Development and Beam Commissioning of 10 MeV Spoke-based Proton Linac  
  • H.F.S. Feisi, W.M. Pan
    IHEP, Bejing, People’s Republic of China
  10 MeV superconducting proton linac based on Spoke cavity was developed and CW 2 mA beam commisioning was successfully conducted at IHEP. This invited talk should present key technology deveopment of Spoke cavities with different beta values, beam commissioning results, technical challenge and lessons to learn as well.  
slides icon Slides TH2A02 [5.792 MB]  
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Intense Beam Generation with 2.45GHz Ion Sources for High Current Linacs  
  • S.X. Peng
    PKU, Beijing, People’s Republic of China
  The constant need for higher beam intensity of single charged ion beams is a strong motivation to investigate 2.45GHz electron cyclotron resonance (ECR) ion source. It has been chosen by many constructed and constructing facilities such as LEDA, IFMIF, SPIRAL2, SARAF, FAIR, ESS, PKUNIFTY, CADS as H+/D+ beam generator. In this paper, a review of its present status will be given. The key issues for a 2.45GHz ECR ion source development will be described. The permanent magnet ECR build by Peking University (PKU) will be displayed as an example.  
slides icon Slides TH2A03 [12.603 MB]  
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