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Typical NC in Warm Modules Following X-ray campaign

Typical NC in Warm Modules Following X-ray campaign. V. Baglin (21/8/12 ). CERN TE-VSC, Geneva. X-ray campaign. Started in January 2011 – to be finished at next TS 1800 X-rays taken 95NC (~ 5 %)

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Typical NC in Warm Modules Following X-ray campaign

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  1. Typical NC in Warm Modules Following X-ray campaign V. Baglin (21/8/12) CERN TE-VSC, Geneva LRFF - 21st August 2012

  2. X-ray campaign • Started in January 2011 – to be finished at next TS • 1800 X-rays taken • 95NC (~ 5 %) • 58 vacuum sector concerned out of 190 at room temperature (88 sectors at cryogenic temperature)

  3. Example of documentation

  4. Reparation campaign • Started during winter technical stop 2011– 2012 : • A5L1.B, A4L2.C, A4R2.C, IP5.X, A4L8.C, A4R8.C repaired • Remains 52 vacuum sector • To be continued during LS1 : • All vacuum sector to be open for activities other than VSC will be repaired • Currently ~ 110 vacuum sectors are foreseen to be opened • Remains 18 vacuum sectors not opened • i.e 29 NC which need to be classified “use as is / repair “ • according to X-ray • according to pressure activity in the vicinity • according to impedance simulation • according to impedance measurement

  5. Typical NC • Spring out • Deformation • Zero length overlap • Is this acceptable impedance wise ?

  6. Typical NC • Spring out • Deformation • Aperture restriction • beam is passing trough since years • Is this acceptable impedance wise ?

  7. Typical NC • Spring out • RF fingers blocked • Overlap acceptable • Is this acceptable impedance wise ?

  8. Typical NC • Spring in place • 1 RF finger out • Overlap acceptable • Is this acceptable impedance wise ?

  9. Typical NC • Spring in place • some RF fingers out • Overlap acceptable • Is this acceptable impedance wise ?

  10. Typical NC • Spring out • RF fingers blocked • Overlap acceptable • Is this acceptable impedance wise ? • Triggered a BD of fill 2978 • Increase vacuum interlock => use as is for beam vacuum performances

  11. Conclusions • X ray campaign of warm module is (almost) finished ! • 95 NC disseminated in 58 vacuum sectors (30 % of total vacsec) • 66 NC will be repaired (70 % of total NC) • 29 NC are actually foreseen not to be repaired in 18 vacuum sectors • The repair of all NC would imply 15 % more activities in the tunnel =>not acceptable • A sorting must be done by LRFF to: • Propose the repair of critical VM • Minimise the number of interventions

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