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Design and Testing of LH2 Absorber Systems for High-Energy Physics Applications

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21 diapositives · 346 Views · Sep 24, 2014

The LH2 absorber collaboration focuses on the development and optimization of liquid hydrogen (LH2) absorbers for high-energy physics experiments. This involves advanced designs, including thin window applications and pressure testing of components. The research addresses critical challenges in minimizing window thickness while ensuring safety and structural integrity using Finite Element Analysis (FEA). Key partners include Northern Illinois University, the Illinois Institute of Technology, and several leading universities. The study utilizes photogrammetry and strain gauge measurements to validate theoretical predictions.

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Design and Testing of LH2 Absorber Systems for High-Energy Physics Applications
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  1. LH2 Absorber Program and Plans Mary Anne Cummings NIU

  2. Mucool LH2 Absorber Collaboration E. L. Black, M. Boghosian, K. Cassel D. M. Kaplan, W. Luebke, Y. Torun Illinois Institute of Technology S. Ishimoto, K. Yoshimura KEK M. A. Cummings, A. Dyshkant, D. Hedin, D. Kubik Northern Illinois University D. Errede, M. Haney University of Illinois, Urbana-Champaign M. Reep, D. Summers University of Mississippi Y. Kuno Osaka University G. Barr, W. Lau Oxford University C. Darve, C. Johnstone*, A. Klebaner, B. Norris, M. Popovic, S. Geer FNAL * also research faculty at IIT

  3. s D r R r displacement displacement r L R r beam axis beam axis Thin Window Design Minimize window thickness: Variable thickness near window edges can further reduce the minimum window thickness near beam: Minimum thickness depends on shape (ASME Standard) Hemispherical: t = 0.5PL / (SE - 0.1P) s = 0.5D Ellipsoidal: t = 0.5PD / ( SE - 0.1P) s = .25D Torispherical: t = 0.885PD / ( SE - 0.1P) s = .169D t = min. thicknesss = sagitta ANSYS Finite Element Analysis, Zhizing Tang, FNAL.

  4. r r R Absorber Window Design Modified Torispherical integrated window and flange design (tapered detail at left). Machine parameters shown. Precision measurement of window and flange with CMM at FNAL Industrial Center.

  5. Window manufacture (U of Miss) Flange/window unit machined from aluminum piece Backplane for window pressure tests

  6. Overpressure Window Test • Safety review requires overpressure and destructive tests of thin windows. • Tests to confirm Finite Element Analysis predictions for window performance.

  7. Strain gages applied to window Window Test Setup Backplane with connections, and with window attached Test setup at NIU for window over-pressure and rupture, front view

  8. Pressure test setup at NIU

  9. Strain Gage Measurement FEA mesh for calcs. on the window-flange unit • Measure the strain on window with strain gages • Use Finite Element Analysis program (ANSYS) to relate vessel pressure to maximum window strain – confirm this with strain gages applied to window surface Rosette gage (three dir.) Two different gages Uniaxial gage Instrumented window

  10. Strain Gage Calibration Testing of strain gages on aluminum 6061 strips … verifying correct strain/stress Relationship, I.e. Young’s Modulus Test setup to stress aluminum “coupons” with strain gages (below)

  11. Photogrammetry • Non-contact measurement of strain by calculating displacement • Compare with strain gage readout and FEA calculations FEA calc. for displacement

  12. Photogrammetry measurements during pressure test. Note the projected dots!

  13. 130 m window: Rupture test 330 m window: Burst at ~ 120 psi New FEA predicted rupture at 110 psi – old FEA predicted at ~ 90 Leaking appeared at 31 psi (predicted rupture ~ 34 psi)… outright rupture at 44 psi!

  14. Strain GageMeasurements

  15. Strain gage data 330m window Strain vs. time – the gage ceases to return to resting position after ~ 80 psi Rosette Gage at 12 mm yielding..

  16. Photogrammetry 130 micron window New “screens” for projector Will provide better coverage of Center and radial geometry

  17. FEA Calculations • 330 micron window (W. Lau) • Non-elastic region included • Three dimensional analysis Stress distribution when first yield developed at 77.7psi (0.536 MPa)pressure

  18. Forced-Flow Absorber Design External Heat Exchange: Mucool ~ 100W (E. Black, IIT) Large and variable beam width => large scale turbulence Establish transverse turbulent flow with nozzles – complicated, hard to simulate

  19. Flow Tests Three test modes: • Absorber manifold , two plastic windows: • Absorber filled with water at room temp. – the pattern of flow will be photographed by circulating water from inlet to outlet using a luminous die injected at inlet • Absorber manifold , one plastic windows, one aluminum window • Absorber subjected to a heat source. Infrared pictures taken (for forced-flow and convection absorber type. • Absorber manifold , two thin Al windows, cryogenic: • Absorber integrated into a cryo system, operating in test mode with extreme temperature and pressure variations considered for safety.

  20. Room Temperature Flow Test Setup

  21. Parameters for various absorber design Prototype LH2:length radius volume heat dep. Press. Temp. “STUDY I” 13 cm 15cm 9.2 liters 91 W 1.2 atm 17oK SFOFO 21 cm 11 cm 9.2 liters 147 W “ “ (1.65) SFOFO 35 cm 18 cm 35.6 245 W “ “ (2.75) DOUBLE 39 cm 20 49 273 W “ “ FLIP MINICOOL 1.75 m 30 495 1.2 kW “ “ ICE 35 (?) 15 31 245 W “ “