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Vacuum Systems of Synchrotron Light Sources Workshop

Join the workshop in Barcelona to learn about identifying and recovering from vacuum problems in synchrotron light sources. Explore vacuum diagnostics, leaks, contaminants, and more. Dive deep into air and water leak detection and recovery methods, with expert insights from Daniela Schmied. Discover techniques to distinguish leaks from humidity issues, and understand the impact of water leaks on equipment. Enhance your knowledge of vacuum systems maintenance and operations for optimal functioning.

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Vacuum Systems of Synchrotron Light Sources Workshop

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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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