Domaine Field CLIC Requrant Customer N Catalan BERF

Domaine / Field: CLIC Requérant / Customer: N. Catalan BE-RF Date: N° EDMS / EDMS Nr. : 18/05/2015 1511281 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 TC 436 model for the oxygen content analysis • EMIA 820 V for the sulphur content analysis. Redaction / Written by: Approuvé par / Accepted by: E. RODRIGUEZ CASTRO – BE/RF-LRF F. LEAUX - EN/MME-MM Expériences / Testing by: Superviseur / Supervisor: E. RODRIGUEZ CASTRO – BE/RF-LRF F. LEAUX - EN/MME-MM 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 H 2 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.

Samples Waveguide From Ø 85 mm bar nr 98 Ø 12 mm Sample 1 Sample 2 Sample 3 S 150 Ø 48 mm for analysis of oxygen and sulphur Sample 4

Conclusions • Sample 1, 2 and 4 are below 5 ppm 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.