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Absorber/vacuum windows and absorber assembly

Absorber/vacuum windows and absorber assembly. Window Requirements MICE experimental constraints Welded vs. non-welded windows Installation Testing. Technical considerations. Manufacture Handling Measurement of window Window helium leak test Test assemblies – windows and test fixtures

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Absorber/vacuum windows and absorber assembly

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  1. Absorber/vacuum windows and absorber assembly Window Requirements MICE experimental constraints Welded vs. non-welded windows Installation Testing

  2. Technical considerations Manufacture Handling Measurement of window Window helium leak test Test assemblies – windows and test fixtures Seal tests – at ambient temp (water) Seal tests – at cryo temp (LN2) Pressure tests – destructive and non destructive (H2O) Window certification – separate from manifold Absorber/vacuum chamber system assembly Assembly certification – absorber and vacuum chamber

  3. Current window design

  4. Absorber Windows • Design: • Internal WAMP = 25 psid • FEA showing max. allowable stress < 0.25 UTS (this is waived by meeting the performance tests below) • Material certification • Window engineering/design drawing • Tests: • Room temperature tests per UG-100 of the ASME code and room temp. burst test. • Liquid nitrogen test – burst test per UG-101 of the ASME code • Note: The LH2 circuit safety relief system includes 2 valves with a 10psid set point. In addition, a PLC-controlled vent valve will be installed FNAL Safety Requirements for Windows

  5. Vacuum Windows • Assumption: Design assumes that the beampipe attaches to absorber vacuum windows, therefore vacuum exists on both sides of the windows • Design: • Internal WAMP = 25 psid • External MAWP = 15 psid • FEA showing maximum allowable stress is <2/3 Sy or < 0.4 Su • Material certification • Window drawing • Tests: • Burst test 5 vacuum windows at room temp. to demonstrate a burst pressure of at least 75 psid for all samples. (pressure exerted on interior side of vacuum volume). • Non-destructive tests at room temperature: • External pressure to 25 psid to demonstrate no failures: no creeping, yielding, elastic collapse/buckling or rupture • Other absorber vacuum jacket testing to ensure its integrity FNAL Safety Requirements for Windows (2)

  6. MICE experimental constraints Flange modification Window protrusion (handling) Non-bolt secured NO design constraint drives welded Instrumentation feedthrough non-welded decision Change over times Extract absorber assembly Remove /replace windows Reassembly certification – absorber and vacuum chamber

  7. Procedure completed Procedure defined Welded vs. non-welded

  8. Installation scenarios Can still take advantage of component modularity: Window manufacture/test/certification - NIU/IIT Absorber manufacture - KEK Absorber/window assembly & cert. - NIU/IIT Vacuum vessel manufacture/connections - NIU/IIT/FNAL Assembly and certification of absorber and vacuum system should be done at RAL “Final” schedule and cost estimate can proceed if provisional decision about window is made… budget for 2002 NSF proposal is the default

  9. Latest design

  10. Absorber testing procedure Have yet to define the safety certification for assembled absorber manifold and vacuum vessel: Window design and prototype certification (separate) Leak checks Pressure tests Non- LH2, cryo certification tests Stability check (instrumentation) Controls need to be defined (FNAL/SLAC model?) Filling/purging procedure established Safety guidelines need to be worked out for secondary vacuum volumes, evacuation mechanics.

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