Oxygen content analysis EN Division-Metallurgy and Metrology Domaine / Field: CLIC Date: 18/05/2015 N° EDMS / EDMS Nr.: 1511281 Requérant / Customer: N. Catalan BE-RF Liste de distribution / Distribution list: CLIC-PROD Oxygen content analysis Données expérimentales / Experimental data: Sample: Oxygen content analysis of 4 different samples. Sulphur content analysis in one sample (sample nr 4). The experimental analysis was carried out by Evans Analytical Group SAS (EAG, France) at their facilities in 94, chemin de la Peyrette 31170 Tournefeuille - FRANCE Equipment : LECO TC436 model for the oxygen content analysis EMIA820V for the sulphur content analysis. Redaction / Written by: E. RODRIGUEZ CASTRO – BE/RF-LRF Approuvé par / Accepted by: F. LEAUX - EN/MME-MM Expériences / Testing by: Superviseur / Supervisor: EN Division-Materials and Metrology CERN/EN/MME-MM/EDMS 1511281

Background Previous studies EDMS nr. 1507789 show some features that only appear in 12 mm discs surface (sample 2, as presented in slide nr.2). One hypothesis about the appearance of these features is a hydrogen illness phenomenon which would occur during heat treatment in H2 atmosphere if oxygen content is higher than 5 ppm as requested in “Technical Specification N° 2001 – Ed. 7 – 11.10.2006” (EDMS 790779). Moreover, it was discovered that the various batches of Cu-OFE did not come from the same supplier. Four samples were sent to Evans Analytical Group (EAG) for oxygen content analysis. In addition one of the samples (sample 4) was requested also for the sulphur content.

S150 Ø 48mm for analysis of oxygen and sulphur Samples S150 Ø 48mm for analysis of oxygen and sulphur Waveguide From Ø 85mm bar nr 98 Ø 12mm Sample 1 Sample 2 Sample 3 Sample 4

Conclusions Sample 1, 2 and 4 are below 5ppm of oxygen. Sample 2 have less than 5 ppm of oxygen  observed features have no relation with oxygen content. Sample 3 is 22 ppm of oxygen what is more than 4 time the upper limit. In sample 4 the S content was also measured being within tolerance.