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Identifying Vacuum Problems and Recovery from Vacuum Failures

Workshop “Vacuum systems of Synchrotron Light Sources“ organized by MAX-LAB & ALBA Barcelona, 12-13 th September 2005. Identifying Vacuum Problems and Recovery from Vacuum Failures. Identifying Vacuum Problems And Recovery from Vacuum Failures.

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Identifying Vacuum Problems and Recovery from Vacuum Failures

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  1. Workshop“Vacuum systems of Synchrotron Light Sources“ organized by MAX-LAB & ALBABarcelona, 12-13th September 2005 Identifying Vacuum Problems and Recovery from Vacuum Failures

  2. Identifying Vacuum Problems And Recovery from Vacuum Failures Workshop “Vacuum systems of Synchrotron Light Sources“Barcelona, 12-13th September 2005 Daniela Schmied IDENTIFICATION OF VACUUM PROBLEMS • VACUUM FAILURES • ON STANDARD VACUUM CHAMBERS • identification using standard vacuum diagnostics • leaks (corrosion, erosion) • faulty chamber parts (RF-liner) • contaminations • VACUUM FAILURES • ON HIGHLY CONDUCTANCE LIMITED VACUUM CHAMBERS • identification using vacuum diagnostic insufficient • low gap chambers • NEG peel-off • In-vacuum undulators • vacuum problem related to machine operation pressure rise , lifetime accidents, high radiation levels

  3. Identifying Vacuum Problems And Recovery from Vacuum Failures Workshop “Vacuum systems of Synchrotron Light Sources“Barcelona, 12-13th September 2005 Daniela Schmied VACUUM FAILURE – AIR LEAK Initially simple observation of vacuum application. Visible only once the IMG reached 10-8mbar range – higher on the leaking spot. Mainly standby interventions to fix leak temporary. Development of survey tool based of the observation of normalized pressure changes related to standard vacuum conditions ( filling modes, gap positions) Extremely sensitive tool to identify leaks ( corrosion ) at a very early state and which allows to schedule intervention to during MDT.

  4. Identifying Vacuum Problems And Recovery from Vacuum Failures Workshop “Vacuum systems of Synchrotron Light Sources“Barcelona, 12-13th September 2005 Daniela Schmied VACUUM FAILURE – AIR LEAK Pen C13-6

  5. Identifying Vacuum Problems And Recovery from Vacuum Failures Workshop “Vacuum systems of Synchrotron Light Sources“Barcelona, 12-13th September 2005 Daniela Schmied IP9 PEN6 IP8 CROTCH2 CROTCH 1 PEN5

  6. Identifying Vacuum Problems And Recovery from Vacuum Failures Workshop “Vacuum systems of Synchrotron Light Sources“Barcelona, 12-13th September 2005 Daniela Schmied VACUUM FAILURE – AIR LEAK HOW TO DISTINGUISH A LEAK FROM A HUMIDITY PROBLEM ? mbar H2O % leak humidity

  7. Identifying Vacuum Problems And Recovery from Vacuum Failures Workshop “Vacuum systems of Synchrotron Light Sources“Barcelona, 12-13th September 2005 Daniela Schmied VACUUM FAILURE – WATER LEAK CELL15 CELL16 CV4 C15-2 CV11 CROTCH2 CV2 CV2 CV11 C16-1 CROTCH1 CROTCH2 CV4 CROTCH1 C15-1 C17-1 C14-7

  8. Identifying Vacuum Problems And Recovery from Vacuum Failures Workshop “Vacuum systems of Synchrotron Light Sources“Barcelona, 12-13th September 2005 Daniela Schmied VACUUM FAILURE – WATER LEAK Failure of D1 crotch absorber • Residual gas analysis performed in each section: • Other than water • also many hydrocarbons present in nearly all sections. • Accident report: • ID 15: straight section needs to be baked • Cell 15: first Dipole chamber needs to be replaced, • cell needs to be baked • ID 16: NEG-coated Aluminum chamber ( 10mm) • …What will be the behavior of the water saturated NEG layer? … • swap of NEG-coated Aluminum chamber ( 10mm) between ID6 and ID16 Cell 16: cell needs to be baked

  9. Identifying Vacuum Problems And Recovery from Vacuum Failures Workshop “Vacuum systems of Synchrotron Light Sources“Barcelona,12- 13th September 2005 Daniela Schmied VACUUM FAILURE – WATER LEAK

  10. Identifying Vacuum Problems And Recovery from Vacuum Failures Workshop “Vacuum systems of Synchrotron Light Sources“Barcelona,12-13th September 2005 Daniela Schmied VACUUM FAILURE – WATER LEAK • Re-installation of ID16 ID6 made it possible to quantify the behavior of the H2O saturated NEG layer. • Bremsstrahlungs measurements performed by the RP-group/P.Berkvens indicated: • No damaging effect of the water • Lost of beam condition memory effect – no difference to totally new installed chamber P.Berkvens

  11. Identifying Vacuum Problems And Recovery from Vacuum Failures Workshop “Vacuum systems of Synchrotron Light Sources“Barcelona, 12-13th September 2005 Daniela Schmied Pressure measurements on highly conductance limited ID chamber uncoated ID Al chamber 10mm Pre-conditioned ID SS chamber 10mm

  12. Identifying Vacuum Problems And Recovery from Vacuum Failures Workshop “Vacuum systems of Synchrotron Light Sources“Barcelona, 12-13th September 2005 Daniela Schmied Pressure measurements on highly conductance limited ID chamber SS-chamber Al-chamber Integrated Dose [Ah]

  13. Identifying Vacuum Problems And Recovery from Vacuum Failures Workshop “Vacuum systems of Synchrotron Light Sources“Barcelona, 12-13th September 2005 Daniela Schmied Pressure measurements on highly conductance limited ID chamber Installation of a pre-conditioned NEG coated Al chamber • Radiation levels on beam line too high • Decision to swap ID6 with ID19 during MDT Radiation levels remains unchanged after swap – suspecting now up/downstream chambers Decision to re-bake ID section properly Problem solved!?

  14. Identifying Vacuum Problems And Recovery from Vacuum Failures Workshop “Vacuum systems of Synchrotron Light Sources“Barcelona, 12-13th September 2005 Daniela Schmied CONCLUSION: • How to qualify vacuum in highly conductance limited chambers? • How to qualify the SR vacuum? in order to distinguish between different interventions at the same time for better understanding to respond questions like: insitu bake out: yes/no Thanks to the Vacuum group, especially to I.Parat, M. Hahn, R. Kersevan, JM.Chaize and G.Naylor for some interesting discussions and ideas.

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