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Status of new RE cavities from Cornell

Status of new RE cavities from Cornell. Takayuki SAEKI (KEK) Ge Mingqi (IHEP) Giulia LANZA (LNL-INFN) 10 April 2006. New RE Cavities from Cornell. Taking a picture of inner surface Before/after each CBP. RE-LR1-3 (looks like annealed). RE-LR1-4 (looks like not-annealed). RE-LR1-3(1).

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Status of new RE cavities from Cornell

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  1. Status of new RE cavitiesfrom Cornell Takayuki SAEKI (KEK) Ge Mingqi (IHEP) Giulia LANZA (LNL-INFN) 10 April 2006

  2. New RE Cavities from Cornell Taking a picture of inner surface Before/after each CBP. RE-LR1-3 (looks like annealed) RE-LR1-4 (looks like not-annealed)

  3. RE-LR1-3(1) Before CBP Equator EBW part (inner surface) After 1st CBP After 2nd CBP Not good EBW

  4. RE-LR1-3(2) After 7th CBP Equator EBW part (inner surface) After 3rd CBP After 12th CBP

  5. RE-LR1-4 (1) Before CBP Equator EBW part (inner surface) After 1st CBP After 2nd CBP Very good EBW

  6. RE-LR1-4 (2) Before CBP Equator EBW part (inner surface) At the start/end of EBW. After 1st CBP After 2nd CBP There is a pit…

  7. RE-LR1-4 (3) After 7th CBP Equator EBW part (inner surface) At the start/end of EBW. After 3rd CBP After 13th CBP Still there is a pit… The pit was removed.

  8. RE-LR1-4 (4) Before CBP Iris part (inner surface) After 1st CBP After 2nd CBP Some grinding…

  9. RE-LR-4 (5) After 7th CBP Iris part (inner surface) After 3rd CBP Grinded part. After 13th CBP

  10. Thickness measurement for new RE cavities from Cornell 14 13 15 12 16 11 17 18 10 19 9 20 8 21 7 22 6 23 24 5 1 2 3 26 27 28 25 4 Numbering of the measurement points RE shape cross-section

  11. RE-LR1-3 Weight measurement Before CBP: 4195.4 g After 1st CBP: 4176.7 g After 2nd CBP: 4157.5 g After 3rd CBP: 4143.5 g After 7th CBP: 4064.4 g After 12th CBP: 3991.7g D-weight = 203.7 g Removed weight 1st CBP: 18.7 g 2nd CBP: 19.2 g 3rd CBP: 14.0 g 4th-7th CBP: 79.1 g 8th-12th CBP: 72.7 g Error is large. Depending on outer surface of cavity,

  12. RE-LR1-4 Weight measurement Before CBP: 4020.5 g After 1st CBP: 3999.5 g After 2nd CBP: 3978.5 g After 3rd CBP: 3962.0 g After 7th CBP: 3884.0 g After 13th CBP: 3789.7 g D-weight = 230.8 g Removed weight 1st CBP: 21.0 g 2nd CBP: 21.0 g 3rd CBP: 16.5 g 4th-7th CBP: 78.0 g 8th-13th CBP: 94.3 g

  13. LR1-3 and LR1-4 after light-CP (10 um) 5 April 2006 LR1-3 and LR1-4 were degassed / annealed at 750 0C for 3 hours on 7 April 2006.

  14. RE LR1-4 10 April 2006 Only LR1-4 will be shipped back to Cornell Univ. soon.

  15. Summary • Two new RE-cavities were delivered from Cornell. (RE-LR1-3 and RE-LR1-4) • RE-LR1-3 (looks like annealed) EBW around equator is good, except a pit at the start/end position of EBW. Some grinding at the iris part. • RE-LR1-4 (looks like not-annealed) EBW around equator is not good. • Removal thickness was measured before/after each CBP. ~30 um / CBP(4 hours, rough-stone). • Weight measurement was done. ~20 g / CBP (4 hours, rough stone). • 12 times CBP’s for LR1-3 (9:rough-stone, 3:fine-stone). 13 times CBP’s for LR1-4 (10: rough-stone, 3:fine-stone). • Final weight of cavities. LR1-3 : 3991.7 g (Removed 203.7 g) LR1-4 : 3789.7 g (Removed 230.8 g) • LR1-3 and LR1-4 were Chemical Polished (CP) by 10 um and degassed (annealed) at 750 0C for 3 hours. • LR1-4 will be shipped back to Cornell Univ. soon.

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