Author: Piquet, O.
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MOOCA02 RFQ Developments at CEA-IRFU 42
  • O. Piquet
    CEA/DSM/IRFU, France
  Vane RFQs are particularly well suited to high intensity proton acceleration, since they offer minimal RF power losses and best accelerating field accuracy. Cea-Irfu is involved in several developments of 4 vane RFQs namely IPHI, Spiral2, Linac4 and ESS. This paper gives an overview of the design flow and tools developed at Irfu in order to design, tune, condition and commission RFQs. SPIRAL2 RFQ will be mainly used to illustrate this design flow. This CW RFQ requires 180 kW to achieve the nominal accelerating voltage. It can accelerate a 5 mA proton or deuteron beam (A/Q=1 and 2) or a 1 mA ion beam with up to A/Q=3 at 0.75 MeV/A. Conditioning and commissioning of this RFQ are actually in progress.  
slides icon Slides MOOCA02 [3.712 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOOCA02  
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MOPOY054 Status of the ESS RFQ 974
  • D. Chirpaz-Cerbat, A. Albéri, A.C. Chauveau, M. Lacroix, N. Misiara, G. Perreu, O. Piquet, H. Przybilski, N. Sellami
    CEA/IRFU, Gif-sur-Yvette, France
  • N. Berton, G. Bourdelle, M. Desmons, A.C. France, V.M. Hennion, P.-A. Leroy, B. Pottin
    CEA/DSM/IRFU, France
  The ESS Radio-Frequency Quadrupole (RFQ) is a 4-vanes resonant cavity designed at the frequency of 352.21 MHz. It must accelerate and bunch a 70mA proton beams from 75keV to 3.62MeV with a 4% duty cycle. The RFQ design has already been done, and documented in other papers. This one will present the global status of the RFQ, with technical solutions cho-sen for the main components (for fabrication and op-eration) and the present status of the RFQ fabrication.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY054  
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THPMB039 Voltage Error Studies in the ESS RFQ 3320
  • A. Ponton, Y.I. Levinsen, E. Sargsyan
    ESS, Lund, Sweden
  • A.C. France, O. Piquet, B. Pottin
    CEA/IRFU, Gif-sur-Yvette, France
  During the fabrication of an RFQ, deviation from the perfect geometry will occur during assembling, brazing and machining the different parts. These geometrical defects will impact the theoretical inter-vane voltage, given by the beam dynamics, by altering the quadrupolar component as well as adding dipolar terms in the voltage function. Tuners can correct partially the effect of the manufacturing. The study summarizes the effects of the voltage errors on the beam quality in the case of the ESS RFQ with a harmonic analysis of the voltage function. We discuss the acceptable level of voltage errors and associated mechanical tolerances.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB039  
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