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Workshop Vacuum systems of Synchrotron Light Sources organized by MAXLAB

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Development of survey tool based of the observation of normalized pressure ... in order to distinguish between different interventions at the same time ... – PowerPoint PPT presentation

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Title: Workshop Vacuum systems of Synchrotron Light Sources organized by MAXLAB


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

2
Workshop Vacuum systems of Synchrotron Light
SourcesBarcelona, 12-13th September 2005
Identifying Vacuum Problems And Recovery from
Vacuum Failures
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
Workshop Vacuum systems of Synchrotron Light
SourcesBarcelona, 12-13th September 2005
Identifying Vacuum Problems And Recovery from
Vacuum Failures
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
Workshop Vacuum systems of Synchrotron Light
SourcesBarcelona, 12-13th September 2005
Identifying Vacuum Problems And Recovery from
Vacuum Failures
Daniela Schmied
VACUUM FAILURE AIR LEAK
Pen C13-6
5
Workshop Vacuum systems of Synchrotron Light
SourcesBarcelona, 12-13th September 2005
Identifying Vacuum Problems And Recovery from
Vacuum Failures
Daniela Schmied
IP9 PEN6
IP8
CROTCH2
CROTCH 1 PEN5
6
Workshop Vacuum systems of Synchrotron Light
SourcesBarcelona, 12-13th September 2005
Identifying Vacuum Problems And Recovery from
Vacuum Failures
Daniela Schmied
VACUUM FAILURE AIR LEAK
HOW TO DISTINGUISH A LEAK FROM A HUMIDITY PROBLEM
?
H2O
mbar
leak
humidity
7
Workshop Vacuum systems of Synchrotron Light
SourcesBarcelona, 12-13th September 2005
Identifying Vacuum Problems And Recovery from
Vacuum Failures
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
Workshop Vacuum systems of Synchrotron Light
SourcesBarcelona, 12-13th September 2005
Identifying Vacuum Problems And Recovery from
Vacuum Failures
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
Workshop Vacuum systems of Synchrotron Light
SourcesBarcelona,12- 13th September 2005
Identifying Vacuum Problems And Recovery from
Vacuum Failures
Daniela Schmied
VACUUM FAILURE WATER LEAK
10
Workshop Vacuum systems of Synchrotron Light
SourcesBarcelona,12-13th September 2005
Identifying Vacuum Problems And Recovery from
Vacuum Failures
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
Workshop Vacuum systems of Synchrotron Light
SourcesBarcelona, 12-13th September 2005
Identifying Vacuum Problems And Recovery from
Vacuum Failures
Daniela Schmied
Pressure measurements on highly conductance
limited ID chamber
uncoated ID Al chamber 10mm
Pre-conditioned ID SS chamber 10mm
12
Workshop Vacuum systems of Synchrotron Light
SourcesBarcelona, 12-13th September 2005
Identifying Vacuum Problems And Recovery from
Vacuum Failures
Daniela Schmied
Pressure measurements on highly conductance
limited ID chamber
SS-chamber
Al-chamber
Integrated Dose Ah
13
Workshop Vacuum systems of Synchrotron Light
SourcesBarcelona, 12-13th September 2005
Identifying Vacuum Problems And Recovery from
Vacuum Failures
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
Workshop Vacuum systems of Synchrotron Light
SourcesBarcelona, 12-13th September 2005
Identifying Vacuum Problems And Recovery from
Vacuum Failures
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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