Microscopy inspection on various LINAC 2 cathodes

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Presentation transcript:

Microscopy inspection on various LINAC 2 cathodes EN Division-Metallurgy and Metrology Domaine / Field: LINAC2 Date: 31-10-2016 N° EDMS / EDMS Nr.: On-going Requérant / Customer: R. Scrivens Liste de distribution / Distribution list: C. Mastrostefano Microscopy inspection on various LINAC 2 cathodes Ana Teresa Pérez EN-MME-MM Equipment: Scanning Electron Microscope (SEM), field emission gun FEG Sigma (ZEISS) with InLens (Secondary Electron), Evan-Thornley Secondary Electron (SE2), and back-scattered electron (AsB) detectors for imaging. 50 mm2 X Max EDS detector (Oxford), INCA software. Digital microscope KEYENCE VHX 1000 Summary: Various specimens were under study but some of the questions remain unanswered. Key words: SEM, OM, LINAC2, ICP-EOS EN Division-Materials and Metrology CERN/EN/MME-MM

Broken source cathode (#1) March 2015 Optical microscopy Samples Received on Performed analysis Broken source cathode (#1) March 2015 Optical microscopy Scanning Electron Microscopy (SEM) Chemical analysis by Energy Dispersive Spectroscopy (EDX) Broken source cathode (#2) July 2015 Reference mesh and mesh on cathode from 1971 (#3) Cathode in operation from March – Sep. 16 (#4) Not broken! Sept. 2016

MESH STRUCTURE The mesh structure presented in all cases nickel (Ni), manganese (Mn), iron (Fe), carbon (C) and oxygen (O). However, a correct identification of some elements, especially Ti is problematic due to EDX artefacts Why Ti?  In the “PROCEDE DE FORMATION DE LA CATHODE A OXYDE DE LA SOURCE DUOPLASMATRON DU LINAC” July 1973, was included a X-ray diffractogram where Ti was present. Ti was not confirmed in used electrodes via EDX due to the Ti (Kα: 4.508) and Ba (Lα: 4.465) peak’s overlapping that might hinder a realistic analysis  External analysis was proposed: Elementary analysis by Inductively Coupled Plasma Optical Emission Spectrometry (ICP-EOS). Company: EAG (FR) SOI-1 SOI-2 SOI-1 SOI-2

PAINTING The painting was analysed and main components were Ni, barium (Ba) and strontium (Sr) corresponding with the expected elements of the mixture (15% BaCo3, 15% SrCo3 and 70% Ni in dust). Nevertheless, these elements seems to be heterogeneously distributed in the cathode surface:

CATHODE IN OPERATION FROM MARCH TO SEPT. 2016 (#4) Cathode analysis, but not dismounting from the support  The cathode will be remounted on a test bench for further heating

SOI-1 SOI-2 SOI-3 SOI-4 SOI-5

SEM observation AsB detector (Sigma) Grey region

SEM observation AsB detector (Sigma) Dark region

SUMMARY Various specimens were under study but some of the questions remain unanswered The mesh composition still not confirmed due to the EDX artefacts  ICP-EOS It seams that the mesh was melt in the cathode areas that appeared dark or broken Painting composition seems to be heterogeneous Study before installation (?) Study of the last electrode (in operation from March to September 2016): No major morphology variations were evident. The chemical analysis was not possible due to the sample size. Nevertheless, different SOI were localized and the images can be compared with future images/studies on the same cathode after heating.