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X-band accelerator structures meeting the Next Linear Collider (NLC) designrequirements have been found to suffer vacuum surface damage caused by radiofrequency (RF) breakdown, when processed to high electric-field gradients.Improved understanding of these breakdown events is desirable for thedevelopment of structure designs, fabrication procedures, and processingtechniques that minimize structure damage. RF reflected wave analysis andacoustic sensor pickup have provided breakdowns localization in RF structures.Particle contaminations found following clean autopsy of four RF-processedtravelling wave structures, have been catalogued and analyzed. Their influenceon RF breakdown, as well as that of several other material-based properties,will be discussed.Comment: 21 pages, 8 figures, 4 tables, Submitted to JVST A as a proceeding of  the 50th AVS conference (Baltimore, MD, 2-7 Nov 2003

Surface analysis of oxygen free electrolytic-copper X-band accelerating structures and possible correlation to radio frequency breakdown events