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Boffo, C.

Paper Title Page
MOPCH174 Optimization of the BCP Processing of Elliptical Nb SRF Cavities 469
 
  • C. Boffo, C. A. Cooper, A.M. Rowe
    Fermilab, Batavia, Illinois
  • G. Galasso
    University of Udine, Udine
 
  Bulk niobium (Nb) electropolished SRF cavities performing at or above 35 MV/m is an aggressive goal recently put forth by the International Linear Collider (ILC) collaboration. Buffered chemical polishing (BCP) is still the most cost effective and least complex processing technique known today to optimize the surface properties of high gradient single crystal and relatively low gradient polycrystalline SRF cavities. BCP will be the preferred chemical process in the production of the nine-cell third harmonic 3.9 GHz cavities at Fermilab. The internal shape of these cavities will result in uneven material removal rates between iris and equator of the cells. We will describe a thermal-fluid finite element model adopted to simulate the etching process, and thus revealing the issues at hand. Experimental work, such as flow visualization tests performed to verify the simulation, will also be discussed. Finally we are presenting results obtained with a novel device, which allows to homogenize the flow pattern and to resolve the problem.  
MOPCH179 Design of a New Electropolishing System for SRF Cavities 484
 
  • T. Tajima
    LANL, Los Alamos, New Mexico
  • C. Boffo
    Fermilab, Batavia, Illinois
  • M.P. Kelly
    ANL, Argonne, Illinois
  • J. Mammosser
    Jefferson Lab, Newport News, Virginia
 
  Electropolishing (EP) is considered the baseline surface treatment for Superconducting RF (SRF) cavities to achieve >35 MV/m accelerating gradient for the International Linear Collider (ILC). Based on the lessons learned at the forerunners such as KEK/Nomura, DESY and JLAB and on the recent studies, we have started a new design of the next EP system that will be installed in the US. This paper presents requirements, specifications, and the detail of the system design as well as the path forward towards the future industrialization.