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Rowe A.

PaperTitlePage
TUP49ECR Plasma Cleaning: An In-situ Processing Technique for RF Cavities243
 
  • G. Wu, H. Jiang, T. Khabiboulline, I. Pechenezhskiy, T. Koeth, J. Reid, W. Muranyi, B. Tennis, E. Harms, Y. Terechkine, H. Edwards, D. Mitchell, A. Rowe, C. Boffo, C. Cooper, L. Cooley, R. Schuessler
    Fermilab
  • W. -D. Moeller
    DESY Hamburg
  • C. Antoine
    CEA-Saclay
  • A. Romanenko
    Cornell University
 
 A condition for Electron Cyclotron Resonance (ECR) can be established inside a fully assembled RF cavity without the need for removing high-power couplers. As such, plasma generated by this process can be used as a final cleaning step, or as an alternative cleaning step in place of other techniques. We will describe the current effort to study plasma cleaning by ECR in a 3.9GHz cavity. 
TUP70Optimization of BCP Processing of Elliptical NB SRF Cavities308
 
  • C. Cooper, G. Galasso, A. Rowe
    Fermilab
  • C. Boffo
    Babcock Noell GmbH
 
 At present, electropolishing (EP) is considered a key technology in fabricating Nb SRF cavities performing at or above 35 MV/m. Nevertheless buffer chemical polishing (BCP) is still a cheaper, simpler and effective processing technique for single grain high gradient and polycrystalline lower gradient cavities. BCP has also been adopted to chemically process the third harmonic 3.9 GHz cavities, operating at or above 14 MV/m, being fabricated at Fermilab [1]. The dimensions and the shape of these cavities pose the problem of uneven material removal between iris and equator of the cells. This paper describes the thermal-fluid finite element model adopted to simulate the process, the experimental flow visualization tests performed to verify the simulation and a novel device fabricated to solve the problem. 
WEP14Commissioning and early operating experience with the Fermilab horizontal test facility469
 
  • R. Carcagno, B. Chase, E. Harms, A. Hocker, P. Prieto, J. Reid, A. Rowe, J. Theilacker, M. Votava
    Fermilab
 
 Fermilab has constructed a facility for testing dressed superconducting radiofrequency (RF) cavities at 1.8 K with high-power pulsed RF. This test stand was designed to test both 9-cell 1.3 GHz TESLA-style cavities and 9- cell 3.9 GHz cavities being built by Fermilab for DESY's TTF-FLASH facility. An overview of the test stand and a description of its initial commissioning is described here. 
WEP41Status of 3.9 GHz superconducting RF cavity technology at Fermilab575
 
  • E. Harms, T. Arkan, L. Bellantoni, H. Carter, H. Edwards, M. Foley, I. Gonin, T. Khabiboulline, D. Mitchell, D. Olis, A. Rowe, N. Solyak
    Fermilab
 
 Fermilab is involved in an effort to assemble 3.9 GHz superconducting RF cavities into a four cavity cryomodule for use at the DESY TTF/FLASH facility as a third harmonic structure. The design gradient of the cavities is 14 MV/m. This effort involves design, fabrication, intermediate testing, assembly, and eventual delivery of the cryomodule. We report on all facets of this enterprise from design through future plans. Included will be test results of single 9-cell cavities, lessons learned, and current status. 
WEP47BCP system for the ANL-FNAL SCPF592
 
  • A. Rowe, D. Assell, L. Elementi, T. Hamerla, S. Reeves, T. Thode
    Fermilab
 
 FNAL has undertaken an effort to design, develop, commission and operate a system that efficiently polishes the interior and exterior surfaces of superconducting radiofrequency (SRF) cavities using buffered chemical polish. This system was designed for the Joint Superconducting Cavity Processing Facility (SCPF) at ANL for use during the GDE S0/S1 ILC cavity testing programs. The demands of the S0/S1 programs required the development of a pre-industrial type polishing system that ensures operator safety as well as procedure reliability and repeatability. The BCP System design methodology and technical details are presented, including a discussion on the control system design and philosophy. The BCP System's safety features, ancillary hardware, and operational scope are also described.