Author: Zha, H.
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TUPTY054 RF Design of the CLIC Structure Prototype Optimized for Manufacturing from Two Halves 2147
 
  • H. Zha, A. Grudiev
    CERN, Geneva, Switzerland
  • V.A. Dolgashev
    SLAC, Menlo Park, California, USA
 
  We present the RF design of a 12GHz Compact Linear Collider (CLIC) main linac accelerating structure prototype. The structure is made from two longitudinally symmetric halves. The main manufacturing process of each half is precision milling. The structure uses the same iris dimensions as the CLIC-G structure but the cell shape is optimized for milling. The geometry is optimized to reduce the surface electric and magnetic fields and the modified Poynting vector. This design can potentially reduce fabrication cost.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPTY054  
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TUPTY055 Optimization of the RF Design of the CLIC Main Linac Accelerating Structure 2150
 
  • H. Zha, A. Grudiev
    CERN, Geneva, Switzerland
 
  We present a new optimized design of the accelerating structure for the main linac of CLIC (Compact Linear Collider). The new structure has lower surface magnetic fields and a significantly smaller transverse size compared to the baseline design described in the CLIC Concept Design Report (CDR). This new design should reach higher accelerating gradients and have a reduced manufacturing cost. The details of the RF design procedure and the obtained results are presented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPTY055  
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TUPTY056 Beam-Based Measurements of Long Range Transverse Wakefields in CLIC Main Linac Accelerating Structure 2153
 
  • H. Zha, A. Grudiev, A. Latina, D. Schulte, A. Solodko, W. Wuensch
    CERN, Geneva, Switzerland
  • E. Adli
    University of Oslo, Oslo, Norway
  • G. De Michele
    EPFL, Lausanne, Switzerland
  • G. De Michele
    PSI, Villigen PSI, Switzerland
  • N. Lipkowitz, G. Yocky
    SLAC, Menlo Park, California, USA
 
  The baseline design of CLIC (Compact Linear Collider) uses X-band accelerating structures in the main linac. Every accelerating structure cell has four waveguides, terminated with individual RF loads, to damp the unwanted long-range transverse wakefields, in order to maintain beam stability in multi-bunch operation. In order to experimentally verify the calculated suppression of the wakefields, a prototype structure has been built and installed in FACET test facility at SLAC. The results of the measurements of the wakefields in the prototype structure by means of positron and electron bunches are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPTY056  
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WEPHA025 Design of a Variable X-band RF Power Splitter 3167
 
  • H. Zha, A. Grudiev, D. Gudkov, I. Syratchev
    CERN, Geneva, Switzerland
 
  The design of a two output ports, high power X-Band RF splitter with arbitrary split ratio is presented. This ratio is adjusted by mechanical changing the position a special RF short circuit piston. The piston is mounted on a step-motor providing the precise movement. Special measures were taken in the design to decrease the maximum electrical field on the cooper surface, as well as to maximise the bandwidth of the device. This splitter will be tested in the high power X-band test stand at CERN.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPHA025  
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