Results on 9 Cell ILC and 9 Cell Re Entrant Cavities.

Favale, A. J. ; Crawford, A. C. ; Cole, M. D. ; Rathke, J. ; Padamee, H.

Technical Information Center Oak Ridge Tennessee

关键词: Accelerators;    Cavity resonators;    Electropolishing;    Magnetic fields;    Linear colliders;   

RP-ID  :  DE2008921980

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

We have recently upgraded our chemical treatment facility, high pressure rinsing system and low temperature RF test set-up to prepare and test 9-cell cavities for ILC. After removal of 120 um by BCP we reached 26 MV/m accelerating field limited by the high-field Q-slope. There was no quench and no field emission, showing that our facilities are well qualified. We have also extended our vertical electropolishing system to 9-cell cavities. Previously we successfully used vertical electropolishing for one-cell cavities of the re-entrant shape to reach 47 MV/m accelerating. Test results on 9-cell electropolished cavities will be presented. AES has manufactured the first 9-cell cavity with re-entrant cell shapes. The surface magnetic field is 10% lower than for the standard TESLA-shape cavity. Half-cells were electropolished 100 um before welding. We will report on the first 9-cell re-entrant cavity.