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Study of MgB 2 Thin Films on Nb by Pulse Laser Deposition

Study of MgB 2 Thin Films on Nb by Pulse Laser Deposition. S.Mitsunobu, S.Inagaki, H.Nakanishi, M.Wake and M.Fukutomi* KEK,NIMR*. Scope of talk Introduction Forming method Mgb2 thin film PLD equipment Precursor annealing RF Measurement of the MgB2 thin film and Nb

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Study of MgB 2 Thin Films on Nb by Pulse Laser Deposition

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  1. Study of MgB2 Thin Films on Nb by Pulse Laser Deposition S.Mitsunobu, S.Inagaki, H.Nakanishi, M.Wake and M.Fukutomi* KEK,NIMR*

  2. Scope of talk Introduction Forming method Mgb2 thin film PLD equipment Precursor annealing RF Measurement of the MgB2 thin film and Nb Measurement of photo electron from the MgB2 thin film and Nb Summary

  3. INTRODUCTION The large efforts have been concentrated on Nb cavities for International Linear Collider (ILC). The maximum accelerating field gradient of Nb cavities is limited about 50 MV/m due to Hcsh. MgB2 have higher Tc than Nb and expected to have higher Hcsh. Thin films of MgB2 on Nb is useful to increase future ILC energy upgrading. At KEK, the preliminary test of thin films on Nb by Pulse Laser Deposition(PLD) method have been started and initially the direct deposition of MgB2 film on Nb was studied.

  4. Conceptual Drawing of Pulse Laser Deposition

  5. Laser system of PLD

  6. Vacuum Chamber of PLD

  7. Substrate MgB2 Target

  8. PLD Processing

  9. Heating 620oC in 1atom Ar

  10. MgB2 film directly formed on Nb of 2.5mm thick

  11. Heating 620oC

  12. Q measurement system

  13. Cu Cold test cavity

  14. Q measurement system

  15. Photo electron measurement by PLD system

  16. Nb MgB2 film on Nb Relative Intensity of Photo electron by 284nm laser wave length

  17. Summery • MgB2 precursor films formed on Nb by PLD. • The precursor film annealed at 620oC. • Cold RF measurement have been done. • The film partially superconducting. • Preliminary, photo electrons were measured for Nb and MgB2. Some damaging of MgB2 surface was induced by defocused laser beam. • More study will be continued.

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