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JLab Update

This report summarizes the optical inspection findings from the TB9NR001 cavity conducted on July 20, 2010. The first inspection revealed a significant number of dust particles on the as-received surface, which were efficiently removed through USC and BCP treatments. The second inspection identified numerous pits near the equator, where the USC and BCP approach was found ineffective compared to prior observations. Notably, pit density was found to be significantly higher than in earlier cavities, and a large defect was noted on the RF surface of cell #4.

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JLab Update

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  1. JLab Update RG ILC Cavity Group Meeting July 20, 2010

  2. TB9NR001 optical inspection and tracking • 1st inspection as received • 2nd inspection after USC + BCP 10um

  3. Equator_NR001_E1_Z161mm_146Degrees0170 Lots of dust particles observed on as-received surface. Efficient removal of them by USC + BCP 10 um evident TB9NR001

  4. Equator_NR001_E1_Z171mm_353Degrees0085 Lots of pits observed near equator EBW on as-received surface USC + BCP 10 um ineffective in removing these defects Consistent with previous observations at JLab What is new: pit density significantly higher than early cavities TB9NR001

  5. A Very Large Defect on RF Surface of TB9NR001 Cell#4 (51mm, 175Degree), near equator EBW As received After BCP 10 um

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