Author: Sugimoto, M.
Paper Title Page
THPIK032 Installation and Low Power Test of IFMIF-EVEDA RFQ at Rokkasho Site 4162
 
  • E. Fagotti, L. Antoniazzi, A. Baldo, A. Battistello, L. Bellan, P. Bottin, M. Comunian, A. Conte, L. Ferrari, M.G. Giacchini, F. Grespan, M. Montis, A. Palmieri, A. Pisent, D. Scarpa
    INFN/LNL, Legnaro (PD), Italy
  • D. Agguiaro, A.G. Colombo
    INFN- Sez. di Padova, Padova, Italy
  • F. Borotto Dalla Vecchia, G. Dughera, G. Giraudo, P. Mereu, R. Panero
    INFN-Torino, Torino, Italy
  • P. Cara, R. Heidinger
    Fusion for Energy, Garching, Germany
  • M. Furini, C. Gessi
    INFN-Bologna, Bologna, Italy
  • D. Gex
    F4E, Germany
  • R. Ichimiya, Y. Ikeda, A. Kasugai, K. Kondo, S. O'hira, K. Sakamoto, T. Shinya, M. Sugimoto
    QST, Aomori, Japan
  • J. Knaster, A. Marqueta, G. Pruneri, F. Scantamburlo
    IFMIF/EVEDA, Rokkasho, Japan
  
  The IFMIF-EVEDA RFQ is composed of 18 modules for a total length of 9.8 m and is designed to accelerate the 125 mA D+ beam up to 5 MeV at the frequency of 175 MHz. The RFQ is subdivided into three Super-Modules of six modules each. The Super-Modules were shipped to Rokkasho (Japan) at the beginning of 2016, pre-assembled 3 m far from the final location and tuned to reach target field flatness requirements. Just after conclusion of injector commissioning, the tuned RFQ was disassembled, moved and reassembled in the final location. After confirmation that field flatness was not affected by this movement, high power couplers were installed and tuned and all the structure was baked. Assembling, tuning and coupling results will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK032  
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THPIK035 Rf Properties of a 175 MHz High-Q Load Circuit 4169
 
  • S. Maebara, M. Sugimoto
    QST, Aomori, Japan
  
  For an RF input coupler test, a 175MHz high-Q load circuit based on a 6 1/8 in. co-axial waveguide was developed. This circuit consists of the RF input coupler, a trombone-type phase shifter and a stub tuner. The coupler with a loop antenna and the stub tuner are located in edges of the circuit, the loop antenna and the tuner work for a short plate. When RF input power is injected into the circuit, a high-voltage standing wave is excited by adjusting the tuner. The power of standing wave required for the tests is also accumulated due to its low resistive loss. At the operation frequency of 175 MHz, the resistive loss of 0.046ohm is measured and an equivalent RF power of 200 kW is accumulated by the RF input power of 740 W. In this circuit, the bandwidth is narrow to be ±5 kHz in S11 parameter of less -20 dB, but the equivalent RF power of 200 kW-14 sec CW could be achieved after sufficient RF aging. Using this high-Q load circuit, all the fabricated 9 couplers were successfully tested for RF contact defects, unnecessary low-Q value and extraordinary outgassing. This article describes these RF properties in detail.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK035  
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