Author: Wuensch, W.
Paper Title Page
MOPLR048 Fabrication and Testing of a Novel S-Band Backward Travelling Wave Accelerating Structure for Proton Therapy Linacs 237
SPWR023   use link to see paper's listing under its alternate paper code  
 
  • S. Benedetti, T. Argyropoulos, C. Blanch Gutiérrez, N. Catalán Lasheras, A. Degiovanni, D. Esperante Pereira, M. Garlaschè, J. Giner Navarro, A. Grudiev, G. McMonagle, A. Solodko, M.A. Timmins, R. Wegner, B.J. Woolley, W. Wuensch
    CERN, Geneva, Switzerland
  • D. Esperante Pereira
    IFIC, Valencia, Spain
 
  Compact and more affordable, facilities for proton therapy are now entering the market of commercial medical accelerators. At CERN, a joint collaboration between CLIC and TERA Foundation led to the design, fabrication and testing of a high gradient accelerating structure prototype, capable of halving the length of state-of-art light ion therapy linacs. This paper focuses on the mechanical design, fabrication and testing of a first prototype. CLIC standardized bead-pull measurement setup was used, leading to a quick and successful tuning of the prototype. The high power tests will soon start in order to prove that the structure can withstand a very high accelerating gradient while suffering no more than 10-6 breakdown per pulse per meter (bpp/m), resulting in less than one breakdown per treatment session.  
poster icon Poster MOPLR048 [2.804 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR048  
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MOPLR066 ProBE: Proton Boosting Extension for Imaging and Therapy 283
 
  • S. Pitman, R. Apsimon, G. Burt
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • A.F. Green, H.L. Owen
    UMAN, Manchester, United Kingdom
  • A. Grudiev, A. Solodko, W. Wuensch
    CERN, Geneva, Switzerland
 
  Funding: This work was funded by STFC and IPS
Proton beam therapy has been shown to be a promising alternative to traditional radiotherapy, especially for paedi- atric malignancies and radio-resistant tumours. Allowing a highly precise tumour irradiation, it is currently limited by range verification. Several imaging modalities can be utilised for treatment planning, but typically X-ray CT is used. CT scans require conversion from Hounsfield units to estimate the proton stopping power (PSP) of the tissue be- ing treated, and this produces inaccuracy. Proton CT (pCT) measures PSP and is thought to allow an improvement of the treatment accuracy. The Christie Hospital will use a 250 MeV cyclotron for proton therapy, in this paper a pulsed linac upgrade is proposed, to provide 350 MeV protons for pCT within the facility. Space contraints require a compact, high gradient (HG) solution that is reliable and affordable.
 
poster icon Poster MOPLR066 [0.610 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR066  
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TU2A04 High-Gradient RF Development and Applications 368
 
  • W. Wuensch
    CERN, Geneva, Switzerland
 
  Significant progress has been made by the CLIC collaboration to understand the phenomena which limit gradient in normal-conducting accelerating structures and to increase achievable gradient in excess of 100 MV/m. Scientific and technological highlights from the CLIC high-gradient program are presented along with on-going developments and future plans. The talk will also give an overview of the range of applications that potentially benefit from high-frequency and high-gradient accelerating technology.  
slides icon Slides TU2A04 [14.317 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TU2A04  
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TUPLR047 Commissioning of XBox-3: A Very High Capacity X-band Test Stand 568
 
  • N. Catalán Lasheras, C.F. Eymin, J. Giner Navarro, G. McMonagle, S.F. Rey, A. Solodko, I. Syratchev, B.J. Woolley, W. Wuensch
    CERN, Geneva, Switzerland
  • T. Argyropoulos, D. Esperante Pereira
    IFIC, Valencia, Spain
  • M. Volpi
    The University of Melbourne, Melbourne, Victoria, Australia
 
  The Compact Linear Collider (CLIC) beam-based acceleration baseline uses high-gradient travelling wave accelerating structures at a frequency of 12 GHz. In order to prove the performance of these structures at high peak power and short pulse width RF, two klystron-based test facilities have been put in operation in the last years. The third X-band testing facility at CERN (Xbox3) has recently been commissioned and has tripled the number of testing slots available. Xbox3 uses a novel way of combining relatively low peak power (6 MW) but high average power klystron units whose power is steered to feed four testing slots with RF to the required power with a repetition rate of up to 400 Hz. Besides the repetition rate, peak power, pulse length and pulse shape can be customized to fit the test requirements. This novel way of combining pulsed RF high power can eventually be used for many other applications where multiple test slots are required.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR047  
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THPLR003 Fabrication and High-Gradient Testing of an Accelerating Structure Made From Milled Halves 845
 
  • W. Wuensch, T. Argyropoulos, N. Catalán Lasheras, D. Esperante Pereira, J. Giner Navarro, A. Grudiev, G. McMonagle, I. Syratchev, B.J. Woolley, H. Zha
    CERN, Geneva, Switzerland
  • T. Argyropoulos, D. Esperante Pereira, J. Giner Navarro
    IFIC, Valencia, Spain
  • G.B. Bowden, V.A. Dolgashev, A.A. Haase
    SLAC, Menlo Park, California, USA
  • P.J. Giansiracusa, T.G. Lucas, M. Volpi
    The University of Melbourne, Melbourne, Victoria, Australia
  • R. Rajamaki
    Aalto University, School of Science and Technology, Aalto, Finland
  • X.F.D. Stragier
    TUE, Eindhoven, The Netherlands
 
  Accelerating structures made from parts which follow symmetry planes offer many potential advantages over traditional disk-based structures: more options for joining (from bonding to welding), following this more options for material state (heat treated or not) and potentially lower cost since structures can be made from fewer parts. An X-band structure made from milled halves, and with a standard benchmarked CLIC test structure design has been fabricated and high-gradient tested in the range of 100 MV/m.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR003  
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