ILC-HIGRADE CAVITIES AS A TOOL OF QUALITY CONTROL FOR EUROPEAN XFEL A. Navitski 1 , E. Elsen 1 , B. Foster 1, 2 , J. Iversen 1 , R. Laasch 2 , A. Matheisen 1 , D. Reschke 1 , 1 1 2 1 1 DESY, Hamburg, Germany, 2 University of Hamburg, Hamburg, Germany Abstract Part of the quality control (QC) and quality assurance (QA) scheme applied for achievement of the designed parameters of the European XFEL cavities is presented. Results of the first tests of QC cavities from the “ILC- HiGrade program” as well as examples of a feedback to the cavity fabrication during the ramping up phase is presented. INTRODUCTION In order to ensure an achievement of the designed parameters of the European XFEL (EXFEL) [1] cavities, the production foresees an extensive quality control (QC) and quality assurance (QA) scheme. An additional quality control tool is given within the “ILC-HiGrade program” [2]. Details of the program and results of the first QC cavities tests as well as examples of feedback to the cavity fabrication during the ramping up phase are presented and discussed. EUROPEAN ILC-HIGRADE PROGRAM The EXFEL cavity order includes an additional 24 cavities as part of the European ILC-HiGrade programme. Initially, these cavities serve as quality-control (QC) samples extracted from the serial production of EXFEL cavities on average once per month. An overview flow scheme of the QC cavity preparation is given in Fig. 1. The first few cavities have been already delivered and passed first cold RF tests. After this normal acceptance test, the cavities are taken out of the production flow and released for further R&D. The QC and QA have to Figure 1: Flow scheme for the “ILC-HiGrade” cavity quality assurance. J. Schaffran , X. Singer , W. Singer , L. Steder , Y. Tamashevich , M. Wenskat 1 1 MOP043 Proceedings of SRF2013, Paris, France ISBN 978-3-95450-143-4 212 Copyright c ○ 2013 by the respective authors 09 Cavity preparation and production K. Technical R&D - Large scale fabrication