Core Technology Developments
Vacuum
Paper Title Page
MOTB01
 Advanced Computational Methods for Vacuum Technology With Application to Synchrotron Radiation Light Sources  
 
  • R. Kersevan
    CERN, Geneva, Switzerland
  
  Following the progress in the design and improvement of their performances, the new generations of light sources have come to a point where diffraction-limited x-ray beams are a reality. This evolutionary trend has required a parallel evolution of the design of their vacuum systems, and the application of cross-disciplinary discoveries in the field of materials, surface treatments, thin-films, pumping technology, and more. This 2 ½ hour tutorial will follow the following program: ▪ Basics of gas dynamics: outgassing, conductance, pumping speed. ▪ Basics of synchrotron radiation (SR), with examples relevant to vacuum design. ▪ SR-induced desorption. ▪ Computational methods for vacuum: a review. ▪ Practical examples of analysis, simulation, and design of key components of light sources. ▪ Summary and conclusions.  
slides icon Slides MOTB01 [49.623 MB]  
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TUPE19 Application of a NEG Coated Chamber at the Canadian Light Source 205
 
  • S.Y. Chen, D. Bertwistle, K. Kei, C. Murray, T.M. Pedersen
    CLS, Saskatoon, Saskatchewan, Canada
  
  In the Fall of 2015 a 4800 mm long NEG coated chamber was installed in the Canadian Light Source in cell 9 straight section. The chamber will occupy to majority of the straight length. The chambers vacuum has been monitored for +1 year and no obvious issues has been found. The chamber body is 10 mm thick and the aperture is an ellipse with a 8 mm height and a 65 mm width. A design feature of the chamber is a lack of support in-between the ends of the chamber. The lack of support space is due to the double elliptically polarizing undulator (54 mm, and 180 mm period). This proceeding details the following: a.The structure design and Finite Element Analysis for the deflection and strength; b.Heat loads and cooling calculation; c.Supports design; d.Deflection and correction with the supports; e.Current strips installation f.Activation;  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE19  
About • paper received ※ 15 September 2016       paper accepted ※ 23 September 2016       issue date ※ 22 June 2017  
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TUPE20
 Noble Gases Flow Management in the European XFEL Project UHV Photon Transport System  
 
  • J.R. Villanueva Guerrero
    XFEL. EU, Hamburg, Germany
  
  The European XFEL facility in Hamburg is based on a linear accelerator and three Free-Electron-Laser beam-lines covering the energy range from 250 eV to 24 keV. It will provide 2700 pulses in trains of 600 microsecond duration at a repetition rate of 10 Hz. For the photon beam diagnostics, several gas-based devices have been developed and placed in the beam transport system. They operate with different noble gases (Xe, Ne, Ar) with pressures up to 1·10-4 mbar. Having a windowless beam-line, and a limited capability for noble gases that can be provided by the distributed array of ion pumps sustaining the UHV environment, a turbo-molecular based differential pumping section has been developed. This modular system is able to minimize the gas flow to the rest of the beam transport system, also offering a large optical clear aperture between pumping stages, and enabling the required installation and alignment flexibility in all the tunnel locations (up to 10), including variations as floor and ceiling-mounted versions. An overview of the vacuum system analysis, validation procedures, and structural and alignment concept, as well as installation status is reported.  
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WECA01
 Low-Cost, High-Performance Non-Evaporable Getter (NEG) Pumps Using NEG Pills  
 
  • K. Mase, T. Kikuchi
    KEK, Tsukuba, Japan
  • H. Kodama, S. Ohno, M. Tanaka
    Yokohama National University, Yokohama, Japan
  • K.K. Okudaira, M. Tanaka
    Chiba University, Chiba, Japan
  
  Non-evaporable getter (NEG) pumps are widely used for maintaining a clean ultra-high vacuum (UHV) of ≤10-8 Pa because of their high pumping speeds for hydrogen and active gases in the UHV region. In addition, they are oil free, evaporation free, sputtering free, sublimation free, magnetic field free, vibration free, economical, compact, lightweight, and energy saving. In the present paper, we report a new NEG pump which is composed of commercial 60 NEG pills (Dia.10 mm × t3 mm; 70 wt% Zr, 24.6 wt% V, and 5.4 wt% Fe), titanium parts, a DN 40 conflat flange, and a tantalum heater. The NEG pills are vertically and radially aligned around the heater to maximize the effective area for pumping. After activation at 400 °C for 30 min, the pumping speeds of the NEG pump were measured with the orifice method. Pumping speeds of 140-130, 200-140, 190-130, and 35-17 L/s were estimated for H2, CO, CO2, and N2 gasses, respectively, in a pumped-quantity range of 0.01-0.1 Pa·L. Since the NEG pump is composed of a heating unit and a NEG module, the pumping speeds can be improved by increasing the number of NEG modules. These NEG pumps are favourable alternatives to sputtering ion pumps.  
slides icon Slides WECA01 [3.077 MB]  
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