Preparations and characterizations for N2 doping/infusion - - PowerPoint PPT Presentation

▶
preparations and
SMART_READER_LITE
LIVE PREVIEW

Preparations and characterizations for N2 doping/infusion - - PowerPoint PPT Presentation

Apr 05, 2023 159 likes •278 views

TTC High Q High G Working Group, 2 nd May 2019 Preparations and characterizations for N2 doping/infusion capabilities at IPNO D. Longuevergne, M. Fouaidy, IPN Orsay VACUUM FURNACE Built by TAVVacuum Furnaces Spa and commissioned in 2016

slide-1
SLIDE 1

Preparations and characterizations for N2 doping/infusion capabilities at IPNO

  • D. Longuevergne, M. Fouaidy, IPN Orsay

TTC High Q – High G Working Group, 2nd May 2019

slide-2
SLIDE 2

VACUUM FURNACE

Built by TAVVacuum Furnaces Spa and commissioned in 2016

Routinely used for hydrogen degassing (650°C, 10h) of SPOKE resonators with Ti jacket

Dimensions : Max diameter : 700 mm. Max Length : 1600 mm

T emperature up to 1300°C (1°C – 10 °C per minutes). Homogeneity : +/- 5°C

Vacuum systems

Primary : Dry screw pump + roots

Secondary : cryogenic pump

Vacuum : 5E-7 – 1E-6 mbar Screw pump Roots pump Cryo pump Vacuum Valve RGA

N2 injection valve N2 injection line N2 injection line

Vacuum gauge

slide-3
SLIDE 3

VACUUM FURNACE

slide-4
SLIDE 4

N2 Injection line

 Air liquide ALPHAGAZ 2 (>99.9999%)  Stainless steel line

(Ethanol rinsed + 150°C baking for > 100h)

 Contamination measurement with RGA while injecting at

10-4 mbar in furnace

QUESTION : How does that look compared to other labs ?

slide-5
SLIDE 5

N2 Infusion on samples

 First infusion test done on Niobium samples (50 um BCP)

exposed directly in furnace (not in Niobium box)

 Cycle :

800°C during 2h under vacuum

Cooling down at 160°C under vacuum

160°C during 48h with 2.5e-2 mbar N2

Cooling down to 40°C under vacuum

T emperature

Secondary vacuum gauge Primary vacuum gauge

QUESTION : Any infusion done without caps ?

slide-6
SLIDE 6

SIMS characterization

 Compact SIMS from Hidden Analytical available at

IPNO (not TOF-SIMS)

Argon 5 keV at 300 nA

Oxygen 5 keV at 300 nA

 Sample analysis with Oxygen :

First nanometer : First minute

slide-7
SLIDE 7

SIMS characterization

First minute After 10 minutes

slide-8
SLIDE 8

SIMS characterization

 Dynamic SIMS : Oxygen beam

slide-9
SLIDE 9

SIMS characterization

 Dynamic SIMS : Argon beam

slide-10
SLIDE 10

SIMS characterization

 Dynamic SIMS : Argon beam

slide-11
SLIDE 11

CONCLUSION

 Injection line has been cleaned as possible

 Ethanol rinsing + 150°C vacuum baking  No significant pollution measured with RGA beside water and

Oxygen => Will install chemical filters

 SIMS analysis of Nb samples show that N2 infused samples

are not more polluted than BCP’d samples

 Resolution of our SIMS too low to measure N2, C and N profils.

 Next steps :

 Infusion of an elliptical cavity from CEA Saclay  TOF-SIMS measurements  Installation of a chemical filter to decrease water and oxgygen

content