Author: Bustinduy, I.
Paper Title Page
TUPVA120 Design and Fabrication of ESS-Bilbao RFQ Linac 2373
 
  • J.L. Muñoz, I. Bustinduy, I. Rueda, D. de Cos
    ESS Bilbao, Zamudio, Spain
 
  The RFQ accelerator for ESS-Bilbao is presented. This device will complete ESS-Bilbao injection chain after the ion source and LEBT. Design, carried out by ESS-Bilbao team, was finished in 2015. Machining has started in 2016. The RFQ is a 4-vane structure, aimed to accelerate protons from 45 keV to 3.0 MeV and operating at 352.2 MHz. It has a total length of about 3.1 meters, divided in 4 segments. Segments themselves are formed by 2 major and 2 minor vanes, assembled together by using polymeric vacuum gaskets instead of brazing or other welding system. In this paper the design is presented, including the beam dynamics, RF cavity design, field flatness and frequency tuning. Cooling and thermo-mechanical design is also described. Mechanical design, including vacuum strategy and test models, is also briefly described (there is a dedicated poster on this). The first segment fabrication is scheduled to finish before the end of 2016, so vacuum and low power RF tests results would also be included in the presented paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA120  
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THPIK082 Quadrupole Magnet Design for the ESS MEBT 4276
 
  • D. Fernandez-Cañoto, I. Bustinduy, G. Harper, J.L. Muñoz, I. Rueda, S. Varnasseri
    ESS Bilbao, Zamudio, Spain
 
  Funding: Consortium ESS Bilbao
ESS Bilbao is responsible for the design and fabrication of the ESS MEBT as an In-Kind contribution. The MEBT includes a focusing lattice with 11 quadrupole magnets with different operational gradients, but fabricated from the same model to simplify manufacturing and save costs. The magnet is designed with a 20.5 mm aperture radius to generate focusing fields of up to 2.74 T and also includes two additional steering coil systems assembled around yoke return arms to produce vertical and horizontal dipole fields up to 20 G·m. The magnet model, which fabrication starts in 2017, is here introduced. Magnetic, thermoelectric and dimensional studies are performed and results compared to specifications. Suitable transfer functions for magnet operation and magnetic fields for a doublet system with a BCM magnetically shielded placed between the two magnets are presented.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK082  
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THPIK083 Mechanical Fabrication of ESS-Bilbao RFQ 4279
 
  • J.L. Muñoz, I. Bustinduy, J. Martin, A. Ortega, I. Rueda, A. Zugazaga
    ESS Bilbao, Zamudio, Spain
  • M.A. Carrera, A. Garbayo
    AVS, Elgoibar, Spain
 
  The fabrication of the first segment of ESS-Bilbao's RFQ has started in 2016. The segment, of about 800 mm in length, is an assembly of 4 elements: two major vanes and two minor ones. The assembly will be done by making use of carefully-designed vacuum polymeric gaskets instead of brazing. Electron beam welding has been used during fabrication of the vanes. Apart from conventional CAD systems, a home-made tool for vane modulation solid generation has been successfully used. Machining process from copper blocks to final elements is described in detail. Also, the software tools created to assess the quality of the vanes by analyzing the metrology measurements, particularly of the modulation, are described in the paper. In order to test and validate the chosen vacuum strategy, an aluminum model using the same gaskets as the final model was built and tested. Results will also be presented. The fabrication of the first segment is expected to end up in early 2017, so assembly, segment alignment and vacuum tests with the real device will also be included in the paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK083  
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