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論文

Engineering design of the RF input coupler for the IFMIF prototype RFQ linac

前原 直; Palmieri, A.*; Mereu, P.*; 市川 雅浩; 高橋 博樹; Comunian, M.*; 鈴木 寛光; Pisent, A.*; 杉本 昌義

Fusion Engineering and Design, 88(9-10), p.2740 - 2743, 2013/10

 被引用回数:3 パーセンタイル:25.83(Nuclear Science & Technology)

For the IFMIF/EVEDA RFQ linac, engineering design of the RF input coupler is carried out. The RF input coupler with a cooling port ($$L$$ = $$lambda$$/4), based on a 6 1/8 inch co-axial waveguide, is designed for the CW operation, and cooling channels are installed into the inside of loop antenna, the outer-conductor and the inner-conductor around RF window. For the loop size, RF coupling factors on beam loading are evaluated with based on the measured S$$_{11}$$ parameter and Q value on Aluminum RFQ module. In order to fulfill the acceptance Q$$_{0}$$ value of 9000 for the RFQ, the insertion depth of L = 45 mm is chosen. For this loop antenna size, magnetic field strength around the loop and surface loss density on the loop are evaluated, it is found to satisfy with the RF coupler acceptance values.

論文

Coupling factor evaluation of the RF input coupler for the IFMIF/EVEDA RFQ linac

前原 直; 市川 雅浩; Palmieri, A.*

Proceedings of 3rd International Particle Accelerator Conference (IPAC '12) (Internet), p.3287 - 3289, 2012/09

In the design of prototype RFQ linac for the IFMIF/EVEDA Project, a 175 MHz RFQ, which has a longitudinal length of 9.78 m, was proposed to accelerate deuteron beam up to 5 MeV. The operation frequency of 175 MHz was selected to accelerate a large current of 125 mA in CW mode. The overall driving RF power of 1.28 MW by 8 RF input couplers has to be injected to the RFQ cavity. As a part of the validation of the coupler design, the beta factor (coupling coefficient) was measured on Aluminum RFQ at INFN Legnaro with on-purpose, real-scale dummy aluminum couplers for the installed depths of L = 27, 40, 45, 48 and 73 mm. In this article, measurement and calculation results performed with the 3D code HFSS for coupling factor evaluation will be presented in details.

論文

The Accelerator prototype of the IFMIF/EVEDA project

Mosnier, A.*; Beauvais, P. Y.*; Branas, B.*; Comunian, M.*; Facco, A.*; Garin, P.*; Gobin, R.*; Gournay, J. F.*; Heidinger, R.*; Ibarra, A.*; et al.

Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.588 - 590, 2010/05

The objectives of the IFMIF/EVEDA project are to produce the detailed design of the entire IFMIF facility, as well as to build and test a number of prototypes, including a high-intensity CW deuteron accelerator (125 mA @ 9 MeV). Most of the accelerator components (injector, RFQ, superconducting RF-linac, transport line and beam dump, RF systems, local control systems, beam instrumentation) are designed and provided by European institutions (CEA/Saclay, CIEMAT, INFN/LNL, SCK-CEN), while the RFQ couplers, the supervision of the control system and the building including utilities constructed at Rokkasho BA site are provided by JAEA. The coordination between Europe and Japan is ensured by an international project team, located in Rokkasho, where the accelerator will be installed and commissioned. The design and R&D activities are presented, as well as the schedule of the prototype accelerator.

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